13-1/2 to 1 compression ...on the street?

13-1/2 to 1 compression ...on the street?

Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
apparently has been at some statewide cruises, rod runs, etc, so I know it's
been driven. My question is, what kind of fuel must the owner be running for
the engine to survive. Heard claim that by retarding the timing somewhat,
pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
familiar with similar cars or situations). Thanks

Re: 13-1/2 to 1 compression ...on the street?

M.Burns wrote:
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
> apparently has been at some statewide cruises, rod runs, etc, so I know it's
> been driven. My question is, what kind of fuel must the owner be running for
> the engine to survive. Heard claim that by retarding the timing somewhat,
> pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
> familiar with similar cars or situations). Thanks
>

Need more info, what kind of engine? Cast iron or aluminum heads? Any
more details on the engine build will help us give you better answers.
I may not be able to directly answer your question, but I know enough to
know that you need to give more info :)

nate


--
replace "roosters" with "cox" to reply.
* members.cox . net /njnagel

Re: 13-1/2 to 1 compression ...on the street?


"M.Burns" wrote:
>
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
> apparently has been at some statewide cruises, rod runs, etc, so I know it's
> been driven. My question is, what kind of fuel must the owner be running for
> the engine to survive. Heard claim that by retarding the timing somewhat,
> pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
> familiar with similar cars or situations). Thanks

#2 diesel?

Re: 13-1/2 to 1 compression ...on the street?


"M.Burns" <mhburns@cox . net > wrote in message
news:91QRj.30840$KJ1.20460@newsfe19.lga...
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
> apparently has been at some statewide cruises, rod runs, etc, so I know it's
> been driven. My question is, what kind of fuel must the owner be running for
> the engine to survive. Heard claim that by retarding the timing somewhat,
> pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
> familiar with similar cars or situations). Thanks

Why not ask the owner ? With a compression ratio that high I think you
wiil need race gas.

Re: 13-1/2 to 1 compression ...on the street?

M.Burns wrote:
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
> apparently has been at some statewide cruises, rod runs, etc, so I know it's
> been driven. My question is, what kind of fuel must the owner be running for
> the engine to survive. Heard claim that by retarding the timing somewhat,
> pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
> familiar with similar cars or situations). Thanks
>
>

What engine and what type of heads? What cam & lifters?

If it has aluminum heads and the proper cam it probably would run just
fine on 93 octane with water injection and playing with the timing some.


--
Steve W.

Re: 13-1/2 to 1 compression ...on the street?

M.Burns <mhburns@cox . net > wrote:
>Looking at a nice Pro Street car with 13.5 to 1 compression pistons. It
>apparently has been at some statewide cruises, rod runs, etc, so I know it's
>been driven. My question is, what kind of fuel must the owner be running for
>the engine to survive. Heard claim that by retarding the timing somewhat,
>pump gas with octane booster works(?) Race fuel? Any ideas (.. . fr om guys
>familiar with similar cars or situations). Thanks

How old is it? If it's old enough to run without a catalytic converter,
100LL aircraft fuel should be okay on the street. May not be high enough
octane.

The "octane booster" in a bottle stuff is usually just MTBE. You can also
still get tetraethyl lead.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Re: 13-1/2 to 1 compression ...on the street?

Alcohol

M.Burns wrote:
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons.=20
> It apparently has been at some statewide cruises, rod runs, etc, so I
> know it's been driven. My question is, what kind of fuel must the
> owner be running for the engine to survive. Heard claim that by
> retarding the timing somewhat, pump gas with octane booster works(?)=20
> Race fuel? Any ideas (.. . fr om guys familiar with similar cars or
> situations). Thanks

Re: 13-1/2 to 1 compression ...on the street?


"wstiefer" <wstiefer@sbcglobal . net > wrote in message
news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
>
Alcohol

My thought, too. If the CR is actually that high I can't see it ever running
on pump gas regardless of the heads, cam, etc.


>M.Burns wrote:
> Looking at a nice Pro Street car with 13.5 to 1 compression pistons.

Re: 13-1/2 to 1 compression ...on the street?

John Kunkel wrote:
> "wstiefer" <wstiefer@sbcglobal . net > wrote in message
> news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
> Alcohol
>
> My thought, too. If the CR is actually that high I can't see it ever running
> on pump gas regardless of the heads, cam, etc.
>
>

Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
down some. No problems at all.

--
Steve W.

Re: 13-1/2 to 1 compression ...on the street?

On Apr 30, 4:24 pm, "Steve W." <csr684...@yahoo . com > wrote:
> John Kunkel wrote:
> > "wstiefer" <wstie...@sbcglobal . net > wrote in message
> >news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
> > Alcohol
>
> > My thought, too. If the CR is actually that high I can't see it ever run=
ning
> > on pump gas regardless of the heads, cam, etc.
>
> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
> on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
> aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
> down some. No problems at all.
>
> --
> Steve W.

I would think the Rhodes lifters would actually hurt, not help -
they'll improve idle quality but at the cost of increased low RPM
cylinder pressures. or am I thinkin' wrong?

I will say that at anything over 10.x:1 you probably need to have
someone GOOD (not me!) tune the engine to avoid an inadvertent
detonation incident.

nate

(currently running 10.25:1 with iron heads - stock 63-64 spec
Studebaker R1 engine...)

Re: 13-1/2 to 1 compression ...on the street?

N8N wrote:
> On Apr 30, 4:24 pm, "Steve W." <csr684...@yahoo . com > wrote:
>> John Kunkel wrote:
>>> "wstiefer" <wstie...@sbcglobal . net > wrote in message
>>> news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
>>> Alcohol
>>> My thought, too. If the CR is actually that high I can't see it ever running
>>> on pump gas regardless of the heads, cam, etc.
>> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
>> on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
>> aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
>> down some. No problems at all.
>>
>> --
>> Steve W.
>
> I would think the Rhodes lifters would actually hurt, not help -
> they'll improve idle quality but at the cost of increased low RPM
> cylinder pressures. or am I thinkin' wrong?
>
> I will say that at anything over 10.x:1 you probably need to have
> someone GOOD (not me!) tune the engine to avoid an inadvertent
> detonation incident.
>
> nate
>
> (currently running 10.25:1 with iron heads - stock 63-64 spec
> Studebaker R1 engine...)

No real pressure increase. You just need to play with the bleed rate
some. Mine was set up to "hide" the real power of that engine. The only
problem I ever had with it was that I kept putting my foot through the
firewall....

Tuning of a true HP engine is an art. Not something you get from books
or online.

--
Steve W.
Near Cooperstown, New York

Re: 13-1/2 to 1 compression ...on the street?

Steve W. wrote:
> N8N wrote:
>
>> On Apr 30, 4:24 pm, "Steve W." <csr684...@yahoo . com > wrote:
>>
>>> John Kunkel wrote:
>>>
>>>> "wstiefer" <wstie...@sbcglobal . net > wrote in message
>>>> news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
>>>> Alcohol
>>>> My thought, too. If the CR is actually that high I can't see it ever
>>>> running
>>>> on pump gas regardless of the heads, cam, etc.
>>>
>>> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
>>> on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
>>> aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
>>> down some. No problems at all.
>>>
>>> --
>>> Steve W.
>>
>>
>> I would think the Rhodes lifters would actually hurt, not help -
>> they'll improve idle quality but at the cost of increased low RPM
>> cylinder pressures. or am I thinkin' wrong?
>>
>> I will say that at anything over 10.x:1 you probably need to have
>> someone GOOD (not me!) tune the engine to avoid an inadvertent
>> detonation incident.
>>
>> nate
>>
>> (currently running 10.25:1 with iron heads - stock 63-64 spec
>> Studebaker R1 engine...)
>
>
> No real pressure increase. You just need to play with the bleed rate
> some. Mine was set up to "hide" the real power of that engine. The only
> problem I ever had with it was that I kept putting my foot through the
> firewall....
>
> Tuning of a true HP engine is an art. Not something you get from books
> or online.
>

OK, so you tuned down the rumpity idle some... but how do you tune out
that "sharp" exhaust sound that you only get with high compression or a
blower?

nate

(appreciates stealth performance)

--
replace "roosters" with "cox" to reply.
* members.cox . net /njnagel

Re: 13-1/2 to 1 compression ...on the street?

Nate Nagel wrote:
> Steve W. wrote:
>> N8N wrote:
>
> OK, so you tuned down the rumpity idle some... but how do you tune out
> that "sharp" exhaust sound that you only get with high compression or a
> blower?
>
> nate
>
> (appreciates stealth performance)
>

Tuned the collectors, Installed an H pipe and used 4 mufflers. The first
two were custom made and designed kind of like a straight through with
concentric baffles(like a silencer). Behind the baffles were channels
that allowed the exhaust to cancel out those hard notes. These fed into
a normal pair of flowmasters.
Until you really climbed on the loud pedal it sounded just a bit warmer
than stock. Surprised more than a few folks.

--
Steve W.
Near Cooperstown, New York

Re: 13-1/2 to 1 compression ...on the street?

Steve W. wrote:
> John Kunkel wrote:
>> "wstiefer" <wstiefer@sbcglobal . net > wrote in message
>> news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
>> Alcohol
>>
>> My thought, too. If the CR is actually that high I can't see it ever
>> running on pump gas regardless of the heads, cam, etc.
>>
>>
>
> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
> on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
> aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
> down some. No problems at all.
>
Actually, NASCAR runs aluminum heads.

Re: 13-1/2 to 1 compression ...on the street?


"Steve W." <csr684NOT@yahoo . com > wrote in message
news:fvaki8$v7k$1@aioe.org...
> John Kunkel wrote:
>> "wstiefer" <wstiefer@sbcglobal . net > wrote in message
>> news:Nl0Sj.12289$2g1.2583@nlpi068.nbdc.sbc . com ...
>> Alcohol
>>
>> My thought, too. If the CR is actually that high I can't see it ever
>> running on pump gas regardless of the heads, cam, etc.
>>
>>
>
> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads.

Your local stations have 98 octane "pump gas"?

Iron heads? Not likely