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Vintage piston?
Vintage piston?
I'm having a 1975 Honda XL350 engine completely redone. I mean
everything. Every seal, gasket, bearing and bushing replaced if it needs
it or not. New valves, valve seals, guides, piston and rings. You name
it, if it even looks worn, it's getting replaced. I'm doing the search
for NOS or aftermarket parts myself, to save paying the mechanic for
surfing the net for them.
I believe I've found everything but a piston. The OEM piston is 79mm
with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
Pistons, and they don't have the specs on file needed to make me a
piston. The best they can do is if I send them an old piston, along with
the combustion chamber volume, then they can make one. I have no idea
what the combustion chamber volume even is!
Are there any other piston companies out there that can make me a piston
like I want, by me just saying the make / model / year and size of
piston? Wiseco maybe?
TIA
I'm having a 1975 Honda XL350 engine completely redone. I mean
everything. Every seal, gasket, bearing and bushing replaced if it needs
it or not. New valves, valve seals, guides, piston and rings. You name
it, if it even looks worn, it's getting replaced. I'm doing the search
for NOS or aftermarket parts myself, to save paying the mechanic for
surfing the net for them.
I believe I've found everything but a piston. The OEM piston is 79mm
with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
Pistons, and they don't have the specs on file needed to make me a
piston. The best they can do is if I send them an old piston, along with
the combustion chamber volume, then they can make one. I have no idea
what the combustion chamber volume even is!
Are there any other piston companies out there that can make me a piston
like I want, by me just saying the make / model / year and size of
piston? Wiseco maybe?
TIA
Re: Vintage piston?
On Thu, 13 Dec 2007 20:23:20 -0600, AWR7MMSTW@webtv,net (Mike Corey) wrote:
> I have no idea
>what the combustion chamber volume even is!
Turn the head upside down. Use a medical syringe to squirt your fluid of choice
into the combustion chamber until it is completely filled. Note how many cc's
of fluid it took to fill the chamber. Tell it to the manufacturer.
You can buy syringes without a prescription at any Tractor Supply store.
They want the old piston in case it is dome-shaped, they'll need to know that to
calculate the effective volume of the chamber.
--
Jack
On Thu, 13 Dec 2007 20:23:20 -0600, AWR7MMSTW@webtv,net (Mike Corey) wrote:
> I have no idea
>what the combustion chamber volume even is!
Turn the head upside down. Use a medical syringe to squirt your fluid of choice
into the combustion chamber until it is completely filled. Note how many cc's
of fluid it took to fill the chamber. Tell it to the manufacturer.
You can buy syringes without a prescription at any Tractor Supply store.
They want the old piston in case it is dome-shaped, they'll need to know that to
calculate the effective volume of the chamber.
--
Jack
Re: Vintage piston?
Mike Corey wrote:
> I'm having a 1975 Honda XL350 engine completely redone. I mean
> everything. Every seal, gasket, bearing and bushing replaced if it
> needs it or not. New valves, valve seals, guides, piston and rings.
> You name it, if it even looks worn, it's getting replaced. I'm doing
> the search for NOS or aftermarket parts myself, to save paying the
> mechanic for surfing the net for them.
>
> I believe I've found everything but a piston. The OEM piston is 79mm
> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> Pistons, and they don't have the specs on file needed to make me a
> piston. The best they can do is if I send them an old piston, along
> with the combustion chamber volume, then they can make one. I have
> no
> idea what the combustion chamber volume even is!
Pull the head, cover the combustion chamber with a plastic plate with
a hole in it, use a burette to fill the chamber with water or oil or
whatever you like, when it's full read off how much you've used and
you've got the combustion chamber volume.
> Are there any other piston companies out there that can make me a
> piston like I want, by me just saying the make / model / year and
> size of piston? Wiseco maybe?
>
> TIA
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
Mike Corey wrote:
> I'm having a 1975 Honda XL350 engine completely redone. I mean
> everything. Every seal, gasket, bearing and bushing replaced if it
> needs it or not. New valves, valve seals, guides, piston and rings.
> You name it, if it even looks worn, it's getting replaced. I'm doing
> the search for NOS or aftermarket parts myself, to save paying the
> mechanic for surfing the net for them.
>
> I believe I've found everything but a piston. The OEM piston is 79mm
> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> Pistons, and they don't have the specs on file needed to make me a
> piston. The best they can do is if I send them an old piston, along
> with the combustion chamber volume, then they can make one. I have
> no
> idea what the combustion chamber volume even is!
Pull the head, cover the combustion chamber with a plastic plate with
a hole in it, use a burette to fill the chamber with water or oil or
whatever you like, when it's full read off how much you've used and
you've got the combustion chamber volume.
> Are there any other piston companies out there that can make me a
> piston like I want, by me just saying the make / model / year and
> size of piston? Wiseco maybe?
>
> TIA
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
Re: Vintage piston?
"J. Clarke" <jclarke.usenet@cox,net > wrote in message
news:fjt0st0usu@news2.newsguy,com ...
> Mike Corey wrote:
>> I'm having a 1975 Honda XL350 engine completely redone. I mean
>> everything. Every seal, gasket, bearing and bushing replaced if it
>> needs it or not. New valves, valve seals, guides, piston and rings.
>> You name it, if it even looks worn, it's getting replaced. I'm doing
>> the search for NOS or aftermarket parts myself, to save paying the
>> mechanic for surfing the net for them.
>>
>> I believe I've found everything but a piston. The OEM piston is 79mm
>> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
>> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
>> Pistons, and they don't have the specs on file needed to make me a
>> piston. The best they can do is if I send them an old piston, along
>> with the combustion chamber volume, then they can make one. I have
>> no
>> idea what the combustion chamber volume even is!
>
> Pull the head, cover the combustion chamber with a plastic plate with
> a hole in it, use a burette to fill the chamber with water or oil or
> whatever you like, when it's full read off how much you've used and
> you've got the combustion chamber volume.
>
That's only a practical approach if the engine is complete.
My reading of the OP is that the engine is already dismantled.
--
Dave
ex Motorcycle Maintenance Workshop
http :// tinyurl,com /4mhaw
"J. Clarke" <jclarke.usenet@cox,net > wrote in message
news:fjt0st0usu@news2.newsguy,com ...
> Mike Corey wrote:
>> I'm having a 1975 Honda XL350 engine completely redone. I mean
>> everything. Every seal, gasket, bearing and bushing replaced if it
>> needs it or not. New valves, valve seals, guides, piston and rings.
>> You name it, if it even looks worn, it's getting replaced. I'm doing
>> the search for NOS or aftermarket parts myself, to save paying the
>> mechanic for surfing the net for them.
>>
>> I believe I've found everything but a piston. The OEM piston is 79mm
>> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
>> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
>> Pistons, and they don't have the specs on file needed to make me a
>> piston. The best they can do is if I send them an old piston, along
>> with the combustion chamber volume, then they can make one. I have
>> no
>> idea what the combustion chamber volume even is!
>
> Pull the head, cover the combustion chamber with a plastic plate with
> a hole in it, use a burette to fill the chamber with water or oil or
> whatever you like, when it's full read off how much you've used and
> you've got the combustion chamber volume.
>
That's only a practical approach if the engine is complete.
My reading of the OP is that the engine is already dismantled.
--
Dave
ex Motorcycle Maintenance Workshop
http :// tinyurl,com /4mhaw
Re: Vintage piston?
Dave Emerson wrote:
> "J. Clarke" <jclarke.usenet@cox,net > wrote in message
>>Pull the head, cover the combustion chamber with a plastic plate with
>>a hole in it, use a burette to fill the chamber with water or oil or
>>whatever you like, when it's full read off how much you've used and
>>you've got the combustion chamber volume.
> That's only a practical approach if the engine is complete.
>
> My reading of the OP is that the engine is already dismantled.
Yes...
How can you cover up the combustion chamber with a plastic plate
if engine isn't dismantled, at least the cylinder head has to be
pulled off the engine, right?
There seems to be some confusion here, some people are trying to
measure the cylinder head combustion chamber volume alone, others
are trying to point out the piston may or may not have a flat top
and it may not come up to the top of the bore, etc.
For the OP's purposes, measuring the CC volume with the plastic
plate approach, plus sending the piston to the fabricators, should
be sufficient.
--
'01 SV650SK1 '99 EX250-F13 '98 ZG1000-A13
OMF #7
Dave Emerson wrote:
> "J. Clarke" <jclarke.usenet@cox,net > wrote in message
>>Pull the head, cover the combustion chamber with a plastic plate with
>>a hole in it, use a burette to fill the chamber with water or oil or
>>whatever you like, when it's full read off how much you've used and
>>you've got the combustion chamber volume.
> That's only a practical approach if the engine is complete.
>
> My reading of the OP is that the engine is already dismantled.
Yes...
How can you cover up the combustion chamber with a plastic plate
if engine isn't dismantled, at least the cylinder head has to be
pulled off the engine, right?
There seems to be some confusion here, some people are trying to
measure the cylinder head combustion chamber volume alone, others
are trying to point out the piston may or may not have a flat top
and it may not come up to the top of the bore, etc.
For the OP's purposes, measuring the CC volume with the plastic
plate approach, plus sending the piston to the fabricators, should
be sufficient.
--
'01 SV650SK1 '99 EX250-F13 '98 ZG1000-A13
OMF #7
Re: Vintage piston?
Dave Emerson wrote:
> "J. Clarke" <jclarke.usenet@cox,net > wrote in message
> news:fjt0st0usu@news2.newsguy,com ...
>> Mike Corey wrote:
>>> I'm having a 1975 Honda XL350 engine completely redone. I mean
>>> everything. Every seal, gasket, bearing and bushing replaced if it
>>> needs it or not. New valves, valve seals, guides, piston and
>>> rings.
>>> You name it, if it even looks worn, it's getting replaced. I'm
>>> doing
>>> the search for NOS or aftermarket parts myself, to save paying the
>>> mechanic for surfing the net for them.
>>>
>>> I believe I've found everything but a piston. The OEM piston is
>>> 79mm
>>> with a 8.3 to 1 compression ratio. The engine currently has a
>>> 79.5mm
>>> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called
>>> JE
>>> Pistons, and they don't have the specs on file needed to make me a
>>> piston. The best they can do is if I send them an old piston,
>>> along
>>> with the combustion chamber volume, then they can make one. I have
>>> no
>>> idea what the combustion chamber volume even is!
>>
>> Pull the head, cover the combustion chamber with a plastic plate
>> with
>> a hole in it, use a burette to fill the chamber with water or oil
>> or
>> whatever you like, when it's full read off how much you've used and
>> you've got the combustion chamber volume.
>>
>
> That's only a practical approach if the engine is complete.
>
> My reading of the OP is that the engine is already dismantled.
If he's already got the engine dismantled then it's even easier since
he doesn't have to pull the head.
Here's a more detailed description of the procedure.
<ttp://www .hydrostream.org/ArticleArchives/CCHeads.htm>
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
Dave Emerson wrote:
> "J. Clarke" <jclarke.usenet@cox,net > wrote in message
> news:fjt0st0usu@news2.newsguy,com ...
>> Mike Corey wrote:
>>> I'm having a 1975 Honda XL350 engine completely redone. I mean
>>> everything. Every seal, gasket, bearing and bushing replaced if it
>>> needs it or not. New valves, valve seals, guides, piston and
>>> rings.
>>> You name it, if it even looks worn, it's getting replaced. I'm
>>> doing
>>> the search for NOS or aftermarket parts myself, to save paying the
>>> mechanic for surfing the net for them.
>>>
>>> I believe I've found everything but a piston. The OEM piston is
>>> 79mm
>>> with a 8.3 to 1 compression ratio. The engine currently has a
>>> 79.5mm
>>> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called
>>> JE
>>> Pistons, and they don't have the specs on file needed to make me a
>>> piston. The best they can do is if I send them an old piston,
>>> along
>>> with the combustion chamber volume, then they can make one. I have
>>> no
>>> idea what the combustion chamber volume even is!
>>
>> Pull the head, cover the combustion chamber with a plastic plate
>> with
>> a hole in it, use a burette to fill the chamber with water or oil
>> or
>> whatever you like, when it's full read off how much you've used and
>> you've got the combustion chamber volume.
>>
>
> That's only a practical approach if the engine is complete.
>
> My reading of the OP is that the engine is already dismantled.
If he's already got the engine dismantled then it's even easier since
he doesn't have to pull the head.
Here's a more detailed description of the procedure.
<ttp://www .hydrostream.org/ArticleArchives/CCHeads.htm>
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
Re: Vintage piston?
Mike Corey wrote:
> I'm having a 1975 Honda XL350 engine completely redone. I mean
> everything. Every seal, gasket, bearing and bushing replaced if it needs
> it or not. New valves, valve seals, guides, piston and rings. You name
> it, if it even looks worn, it's getting replaced. I'm doing the search
> for NOS or aftermarket parts myself, to save paying the mechanic for
> surfing the net for them.
>
> I believe I've found everything but a piston. The OEM piston is 79mm
> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> Pistons, and they don't have the specs on file needed to make me a
> piston. The best they can do is if I send them an old piston, along with
> the combustion chamber volume, then they can make one. I have no idea
> what the combustion chamber volume even is!
It's "X"
And http :// www .cyclechaos,com /wiki/Honda_XL350#1975 says the
displacement is 348cc
(348 + X)/X = 8.3
348 + X = 8.3X
348 = 8.3X - X
348 = (8.3 - 1)X
348 = 7.3X
X = 47.67
> Are there any other piston companies out there that can make me a piston
> like I want, by me just saying the make / model / year and size of
> piston? Wiseco maybe?
>
> TIA
Mike Corey wrote:
> I'm having a 1975 Honda XL350 engine completely redone. I mean
> everything. Every seal, gasket, bearing and bushing replaced if it needs
> it or not. New valves, valve seals, guides, piston and rings. You name
> it, if it even looks worn, it's getting replaced. I'm doing the search
> for NOS or aftermarket parts myself, to save paying the mechanic for
> surfing the net for them.
>
> I believe I've found everything but a piston. The OEM piston is 79mm
> with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> Pistons, and they don't have the specs on file needed to make me a
> piston. The best they can do is if I send them an old piston, along with
> the combustion chamber volume, then they can make one. I have no idea
> what the combustion chamber volume even is!
It's "X"
And http :// www .cyclechaos,com /wiki/Honda_XL350#1975 says the
displacement is 348cc
(348 + X)/X = 8.3
348 + X = 8.3X
348 = 8.3X - X
348 = (8.3 - 1)X
348 = 7.3X
X = 47.67
> Are there any other piston companies out there that can make me a piston
> like I want, by me just saying the make / model / year and size of
> piston? Wiseco maybe?
>
> TIA
Re: Vintage piston?
On Dec 13, 11:43 pm, Beryl <flyingterra...@chillybits.org> wrote:
> Mike Corey wrote:
> > I'm having a 1975 Honda XL350 engine completely redone. I mean
> > everything. Every seal, gasket, bearing and bushing replaced if it needs
> > it or not. New valves, valve seals, guides, piston and rings. You name
> > it, if it even looks worn, it's getting replaced. I'm doing the search
> > for NOS or aftermarket parts myself, to save paying the mechanic for
> > surfing the net for them.
>
> > I believe I've found everything but a piston. The OEM piston is 79mm
> > with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> > piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> > Pistons, and they don't have the specs on file needed to make me a
> > piston. The best they can do is if I send them an old piston, along with
> > the combustion chamber volume, then they can make one. I have no idea
> > what the combustion chamber volume even is!
>
> It's "X"
> And http :// www .cyclechaos,com /wiki/Honda XL350#1975says the
> displacement is 348cc
>
> (348 + X)/X = 8.3
> 348 + X = 8.3X
> 348 = 8.3X - X
> 348 = (8.3 - 1)X
> 348 = 7.3X
> X = 47.67
>
>
>
> > Are there any other piston companies out there that can make me a piston
> > like I want, by me just saying the make / model / year and size of
> > piston? Wiseco maybe?
>
> > TIA- Hide quoted text -
>
> - Show quoted text -
That assumes the 8.3 is accurate. It also assumes that the piston has
a flat top that is flush with the top of the cylinder. The chamber
could be larger and part of it is occupied by a piston dome. The deck
height is probably a bit below the top of the cylinder and there are
valve pockets in the piston crown that figure into the combustion
chamber volume.
On Dec 13, 11:43 pm, Beryl <flyingterra...@chillybits.org> wrote:
> Mike Corey wrote:
> > I'm having a 1975 Honda XL350 engine completely redone. I mean
> > everything. Every seal, gasket, bearing and bushing replaced if it needs
> > it or not. New valves, valve seals, guides, piston and rings. You name
> > it, if it even looks worn, it's getting replaced. I'm doing the search
> > for NOS or aftermarket parts myself, to save paying the mechanic for
> > surfing the net for them.
>
> > I believe I've found everything but a piston. The OEM piston is 79mm
> > with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
> > piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
> > Pistons, and they don't have the specs on file needed to make me a
> > piston. The best they can do is if I send them an old piston, along with
> > the combustion chamber volume, then they can make one. I have no idea
> > what the combustion chamber volume even is!
>
> It's "X"
> And http :// www .cyclechaos,com /wiki/Honda XL350#1975says the
> displacement is 348cc
>
> (348 + X)/X = 8.3
> 348 + X = 8.3X
> 348 = 8.3X - X
> 348 = (8.3 - 1)X
> 348 = 7.3X
> X = 47.67
>
>
>
> > Are there any other piston companies out there that can make me a piston
> > like I want, by me just saying the make / model / year and size of
> > piston? Wiseco maybe?
>
> > TIA- Hide quoted text -
>
> - Show quoted text -
That assumes the 8.3 is accurate. It also assumes that the piston has
a flat top that is flush with the top of the cylinder. The chamber
could be larger and part of it is occupied by a piston dome. The deck
height is probably a bit below the top of the cylinder and there are
valve pockets in the piston crown that figure into the combustion
chamber volume.
Re: Vintage piston?
Bruce Richmond wrote:
> On Dec 13, 11:43 pm, Beryl <flyingterra...@chillybits.org> wrote:
>
>>Mike Corey wrote:
>>
>>>I'm having a 1975 Honda XL350 engine completely redone. I mean
>>>everything. Every seal, gasket, bearing and bushing replaced if it needs
>>>it or not. New valves, valve seals, guides, piston and rings. You name
>>>it, if it even looks worn, it's getting replaced. I'm doing the search
>>>for NOS or aftermarket parts myself, to save paying the mechanic for
>>>surfing the net for them.
>>
>>>I believe I've found everything but a piston. The OEM piston is 79mm
>>>with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
>>>piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
>>>Pistons, and they don't have the specs on file needed to make me a
>>>piston. The best they can do is if I send them an old piston, along with
>>>the combustion chamber volume, then they can make one. I have no idea
>>>what the combustion chamber volume even is!
>>
>>It's "X"
>>And http :// www .cyclechaos,com /wiki/Honda_XL350#1975says the
>>displacement is 348cc
>>
>>(348 + X)/X = 8.3
>>348 + X = 8.3X
>>348 = 8.3X - X
>>348 = (8.3 - 1)X
>>348 = 7.3X
>>X = 47.67
>>
>>
>>
>>
>>>Are there any other piston companies out there that can make me a piston
>>>like I want, by me just saying the make / model / year and size of
>>>piston? Wiseco maybe?
>>
>>>TIA- Hide quoted text -
>>
>>- Show quoted text -
>
>
> That assumes the 8.3 is accurate.
Of course.
> It also assumes that the piston has a flat top that is flush with the top of the cylinder.
> The chamber could be larger and part of it is occupied by a piston dome. The deck
> height is probably a bit below the top of the cylinder and there are
> valve pockets in the piston crown that figure into the combustion
> chamber volume.
Pouring water into the head won't take the shape of the piston crown
into account either.
Bruce Richmond wrote:
> On Dec 13, 11:43 pm, Beryl <flyingterra...@chillybits.org> wrote:
>
>>Mike Corey wrote:
>>
>>>I'm having a 1975 Honda XL350 engine completely redone. I mean
>>>everything. Every seal, gasket, bearing and bushing replaced if it needs
>>>it or not. New valves, valve seals, guides, piston and rings. You name
>>>it, if it even looks worn, it's getting replaced. I'm doing the search
>>>for NOS or aftermarket parts myself, to save paying the mechanic for
>>>surfing the net for them.
>>
>>>I believe I've found everything but a piston. The OEM piston is 79mm
>>>with a 8.3 to 1 compression ratio. The engine currently has a 79.5mm
>>>piston. I want to bore it to a 81mm with 9.5 to 1 ratio. I called JE
>>>Pistons, and they don't have the specs on file needed to make me a
>>>piston. The best they can do is if I send them an old piston, along with
>>>the combustion chamber volume, then they can make one. I have no idea
>>>what the combustion chamber volume even is!
>>
>>It's "X"
>>And http :// www .cyclechaos,com /wiki/Honda_XL350#1975says the
>>displacement is 348cc
>>
>>(348 + X)/X = 8.3
>>348 + X = 8.3X
>>348 = 8.3X - X
>>348 = (8.3 - 1)X
>>348 = 7.3X
>>X = 47.67
>>
>>
>>
>>
>>>Are there any other piston companies out there that can make me a piston
>>>like I want, by me just saying the make / model / year and size of
>>>piston? Wiseco maybe?
>>
>>>TIA- Hide quoted text -
>>
>>- Show quoted text -
>
>
> That assumes the 8.3 is accurate.
Of course.
> It also assumes that the piston has a flat top that is flush with the top of the cylinder.
> The chamber could be larger and part of it is occupied by a piston dome. The deck
> height is probably a bit below the top of the cylinder and there are
> valve pockets in the piston crown that figure into the combustion
> chamber volume.
Pouring water into the head won't take the shape of the piston crown
into account either.
Re: Vintage piston?
On Thu, 13 Dec 2007 21:29:05 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>Pouring water into the head won't take the shape of the piston crown
>into account either.
Did you not read where he said " if I send them an old piston, along with the
combustion chamber volume, then they can make one"?
--
Jack
On Thu, 13 Dec 2007 21:29:05 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>Pouring water into the head won't take the shape of the piston crown
>into account either.
Did you not read where he said " if I send them an old piston, along with the
combustion chamber volume, then they can make one"?
--
Jack
Re: Vintage piston?
> Did you not read where he said " if I send them an old piston, along with
> the
> combustion chamber volume, then they can make one"?
>
I am making some devices for Lotus guys that are a polycarbonate dish that
fits the piston to "cc" the volume of the piston crown. I am certain that JE
Pistons has one.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
> Did you not read where he said " if I send them an old piston, along with
> the
> combustion chamber volume, then they can make one"?
>
I am making some devices for Lotus guys that are a polycarbonate dish that
fits the piston to "cc" the volume of the piston crown. I am certain that JE
Pistons has one.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
Re: Vintage piston?
"Stupendous Man" <spam@trap,com > wrote
> I am making some devices for Lotus guys that are a polycarbonate dish that
> fits the piston to "cc" the volume of the piston crown. I am certain that
> JE Pistons has one.
Here they are,
http :// i221.photobucket,com /albums/dd236/arborigine/MVC-085S.jpg
http :// i221.photobucket,com /albums/dd236/arborigine/MVC-082S.jpg
Drip fluid in from a burette and subtract amount from empty volume.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
"Stupendous Man" <spam@trap,com > wrote
> I am making some devices for Lotus guys that are a polycarbonate dish that
> fits the piston to "cc" the volume of the piston crown. I am certain that
> JE Pistons has one.
Here they are,
http :// i221.photobucket,com /albums/dd236/arborigine/MVC-085S.jpg
http :// i221.photobucket,com /albums/dd236/arborigine/MVC-082S.jpg
Drip fluid in from a burette and subtract amount from empty volume.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
Re: Vintage piston?
Jack Hunt wrote:
> On Thu, 13 Dec 2007 21:29:05 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>
>
>>Pouring water into the head won't take the shape of the piston crown
>>into account either.
>
>
> Did you not read where he said " if I send them an old piston, along with the
> combustion chamber volume, then they can make one"?
Yeah, I read that.
We both read that JE Pistons wants to know the combustion chamber
volume, too.
You confused cylinder head volume with combustion chamber volume when
you suggested "Turn the head upside down. Use a medical syringe to
squirt your fluid of choice into the combustion chamber until it is
completely filled. Note how many cc's of fluid it took to fill the
chamber."
Not just you, everybody (except Mark Olson) is ignoring the difference.
Jack Hunt wrote:
> On Thu, 13 Dec 2007 21:29:05 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>
>
>>Pouring water into the head won't take the shape of the piston crown
>>into account either.
>
>
> Did you not read where he said " if I send them an old piston, along with the
> combustion chamber volume, then they can make one"?
Yeah, I read that.
We both read that JE Pistons wants to know the combustion chamber
volume, too.
You confused cylinder head volume with combustion chamber volume when
you suggested "Turn the head upside down. Use a medical syringe to
squirt your fluid of choice into the combustion chamber until it is
completely filled. Note how many cc's of fluid it took to fill the
chamber."
Not just you, everybody (except Mark Olson) is ignoring the difference.
Re: Vintage piston?
On Fri, 14 Dec 2007 12:34:45 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>You confused cylinder head volume with combustion chamber volume when
>you suggested "Turn the head upside down.
No I didn't. The volume of the combustion chamber is the volume of the head
minus the volume of the piston dome, if there is one.
That's why they want the old piston. Anybody can determine the volume of the
head, but not one in a hundred can determine the volume of a piston dome. If
it's an irregular shape with valve indentures, then not one in a million can do
it.
But let's address the elephant in the living room. Why would someone spend so
much money on a forgettable bike?
--
Jack
On Fri, 14 Dec 2007 12:34:45 -0800, Beryl <flyingterrapin@chillybits.org> wrote:
>You confused cylinder head volume with combustion chamber volume when
>you suggested "Turn the head upside down.
No I didn't. The volume of the combustion chamber is the volume of the head
minus the volume of the piston dome, if there is one.
That's why they want the old piston. Anybody can determine the volume of the
head, but not one in a hundred can determine the volume of a piston dome. If
it's an irregular shape with valve indentures, then not one in a million can do
it.
But let's address the elephant in the living room. Why would someone spend so
much money on a forgettable bike?
--
Jack
Re: Vintage piston?
On Dec 14, 6:58 pm, Jack Hunt <jhun...@tds,net > wrote:
> On Fri, 14 Dec 2007 12:34:45 -0800, Beryl <flyingterra...@chillybits.org> wrote:
> >You confused cylinder head volume with combustion chamber volume when
> >you suggested "Turn the head upside down.
>
> No I didn't. The volume of the combustion chamber is the volume of the head
> minus the volume of the piston dome, if there is one.
>
> That's why they want the old piston. Anybody can determine the volume of the
> head, but not one in a hundred can determine the volume of a piston dome. If
> it's an irregular shape with valve indentures, then not one in a million can do
> it.
Wow, you make me feel so special ;)
With the piston at TDC use a set of parallels and a depth mic to
determine the height of the dome above the deck. Replace the top ring
with a rubber o-ring and push the piston down below the deck. Depth
mic from the deck down to the top of the piston and calculate how far
it is below TDC. Using the same equipment you used to cc the head,
measure the volume above the piston to the deck. Calculate the volume
displaced by moving the piston down from TDC. Subtract the measured
volume. The result is the volume of the dome with all it's
irrgularities that must be subtracted from the head volume to get the
actual combustion chamber volume.
Bruce
> But let's address the elephant in the living room. Why would someone spend so
> much money on a forgettable bike?
>
> --
> Jack
On Dec 14, 6:58 pm, Jack Hunt <jhun...@tds,net > wrote:
> On Fri, 14 Dec 2007 12:34:45 -0800, Beryl <flyingterra...@chillybits.org> wrote:
> >You confused cylinder head volume with combustion chamber volume when
> >you suggested "Turn the head upside down.
>
> No I didn't. The volume of the combustion chamber is the volume of the head
> minus the volume of the piston dome, if there is one.
>
> That's why they want the old piston. Anybody can determine the volume of the
> head, but not one in a hundred can determine the volume of a piston dome. If
> it's an irregular shape with valve indentures, then not one in a million can do
> it.
Wow, you make me feel so special ;)
With the piston at TDC use a set of parallels and a depth mic to
determine the height of the dome above the deck. Replace the top ring
with a rubber o-ring and push the piston down below the deck. Depth
mic from the deck down to the top of the piston and calculate how far
it is below TDC. Using the same equipment you used to cc the head,
measure the volume above the piston to the deck. Calculate the volume
displaced by moving the piston down from TDC. Subtract the measured
volume. The result is the volume of the dome with all it's
irrgularities that must be subtracted from the head volume to get the
actual combustion chamber volume.
Bruce
> But let's address the elephant in the living room. Why would someone spend so
> much money on a forgettable bike?
>
> --
> Jack
