What's the bore and stroke of an F1 engine?

Re: What's the bore and stroke of an F1 engine?

Phil Carmody wrote:
> Greg Campbell <nospam@null . net > writes:
>> PP@2K . com wrote:
>>
>>> At 19,000 RPM, the pistons are going up and down more than 300 times
>>> per second. How far do they travel?
>>
>> Here are some numbers, based on a 2.5 stroke:bore ratio (found on a
>> less-than-authoritative sounding Wiki page.)
>>
>> 2400cc/8
>> 300 cc per Cylinder
>>
>> Bore
>> 14.5cm = 5.7 inches
>> Stroke
>> 5.7cm = 2.25 inches
>> (14.5 x 5.7 gives 299.6 cc per pot)
>
> cm*cm != cc
>
> Phil

Ugh! Did I do a dumb thing.....?
Goes to show what 4 hours sleep will do to a person's brain........

Re: What's the bore and stroke of an F1 engine?

Greg Campbell <nospam@null . net > writes:
> Phil Carmody wrote:
>> Greg Campbell <nospam@null . net > writes:
>>> PP@2K . com wrote:
>>>
>>>> At 19,000 RPM, the pistons are going up and down more than 300 times
>>>> per second. How far do they travel?
>>>
>>> Here are some numbers, based on a 2.5 stroke:bore ratio (found on a
>>> less-than-authoritative sounding Wiki page.)
>>>
>>> 2400cc/8
>>> 300 cc per Cylinder
>>>
>>> Bore
>>> 14.5cm = 5.7 inches
>>> Stroke
>>> 5.7cm = 2.25 inches
>>> (14.5 x 5.7 gives 299.6 cc per pot)
>>
>> cm*cm != cc
>
> Ugh! Did I do a dumb thing.....?

I wasn't sure, I'm one of DB's annoying number 2s! However, I'm
a mathematician and can detect incorrect dimensions more easily
than I can find my spectacles when they're on my forehead.

Taking bore as 92mm from another branch of the thread. r=4.6cm
x-sectional area = pi*r^2 = 66.5 cm^2
reverse engineering from V*8=2400cc, V=300cc => s=4.5cm

Sanity check bore/stroke = 1 which is surprisingly square
given the numbers thrown around elsethread.

(You'd want 3.6-3.7 cm bore if you really wanted a bsr of 2 in
a 2400cc V8, for reference.)

> Goes to show what 4 hours sleep will do to a person's brain........

Blimey, that's worse than me.

Phil
--
Dear aunt, let's set so double the killer delete select all.
-- Microsoft voice recognition live demonstration

Re: What's the bore and stroke of an F1 engine?

Phil Carmody <thefatphil_demunged@yahoo.co.uk> writes:
> Greg Campbell <nospam@null . net > writes:
>> Phil Carmody wrote:
>>> Greg Campbell <nospam@null . net > writes:
>>>> PP@2K . com wrote:
>>>>
>>>>> At 19,000 RPM, the pistons are going up and down more than 300 times
>>>>> per second. How far do they travel?
>>>>
>>>> Here are some numbers, based on a 2.5 stroke:bore ratio (found on a
>>>> less-than-authoritative sounding Wiki page.)
>>>>
>>>> 2400cc/8
>>>> 300 cc per Cylinder
>>>>
>>>> Bore
>>>> 14.5cm = 5.7 inches
>>>> Stroke
>>>> 5.7cm = 2.25 inches
>>>> (14.5 x 5.7 gives 299.6 cc per pot)
>>>
>>> cm*cm != cc
>>
>> Ugh! Did I do a dumb thing.....?
>
> I wasn't sure, I'm one of DB's annoying number 2s! However, I'm
> a mathematician and can detect incorrect dimensions more easily
> than I can find my spectacles when they're on my forehead.
>
> Taking bore as 92mm from another branch of the thread. r=4.6cm
> x-sectional area = pi*r^2 = 66.5 cm^2
> reverse engineering from V*8=2400cc, V=300cc => s=4.5cm

Alright up to here.

> Sanity check bore/stroke =

BZZZT! Forgot I divided by 2 for radius.

... = just over 2


--
Dear aunt, let's set so double the killer delete select all.
-- Microsoft voice recognition live demonstration

Re: What's the bore and stroke of an F1 engine?

Greg Campbell wrote:

> PP@2K . com wrote:
>
> > At 19,000 RPM, the pistons are going up and down more than 300 times
> > per second. How far do they travel?
>
>
> Here are some numbers, based on a 2.5 stroke:bore ratio (found on a
> less-than-authoritative sounding Wiki page.)
>
> 2400cc/8
> 300 cc per Cylinder
>
> Bore
> 14.5cm = 5.7 inches
> Stroke
> 5.7cm = 2.25 inches
> (14.5 x 5.7 gives 299.6 cc per pot)
>
> Piston travel per crank rotation.
> 4.5 inches (stroke*2 / 2.54)
>
> Average velocity at 19K:
> (Peak V will be ~1.4x higher, I believe.)
>
> =85,500 inches/minute
> =1425 inches/sec
> =7125 feet/min
> =81 Miles/hr
> 6 Meters/sec
>
>
> <Looking for validation...>
> Ah, here's an article about BMW'2 2003 V10
> * scarbsf1 . com /BMW P83/index.html
>
> My values look ballpark accurate.

* tinyurl . com /6am8cm

or

* tinyurl . com /5kxobk

any good?

--
Pitwall is an online F1 manager game where you receive a team and need
to develop the team to get on the top podium position! Pitwall is
entirely free! No sh*t!
* tinyurl . com /5y6ls3

Re: What's the bore and stroke of an F1 engine?

Bigbird wrote:

> Greg Campbell wrote:
>
> > PP@2K . com wrote:
> >
> > > At 19,000 RPM, the pistons are going up and down more than 300
> > > times per second. How far do they travel?
> >
> >
> > Here are some numbers, based on a 2.5 stroke:bore ratio (found on a
> > less-than-authoritative sounding Wiki page.)
> >
> > 2400cc/8
> > 300 cc per Cylinder
> >
> > Bore
> > 14.5cm = 5.7 inches
> > Stroke
> > 5.7cm = 2.25 inches
> > (14.5 x 5.7 gives 299.6 cc per pot)
> >
> > Piston travel per crank rotation.
> > 4.5 inches (stroke*2 / 2.54)
> >
> > Average velocity at 19K:
> > (Peak V will be ~1.4x higher, I believe.)
> >
> > =85,500 inches/minute
> > =1425 inches/sec
> > =7125 feet/min
> > =81 Miles/hr
> > 6 Meters/sec
> >
> >
> > <Looking for validation...>
> > Ah, here's an article about BMW'2 2003 V10
> > * scarbsf1 . com /BMW P83/index.html
> >
> > My values look ballpark accurate.
>
> * tinyurl . com /6am8cm
>
> or
>
> * tinyurl . com /5kxobk
>

Sorry, went skewy on the units. sh/be per hour.

First time trying google calculator.

> any good?



--
Pitwall is an online F1 manager game where you receive a team and need
to develop the team to get on the top podium position! Pitwall is
entirely free! No sh*t!
* tinyurl . com /5y6ls3

Re: What's the bore and stroke of an F1 engine?


<PP@2K . com > wrote in message
news:ojqb14dhbjcckqfdh5nhs42pl0mgc0g48p@4ax . com ...
> At 19,000 RPM, the pistons are going up and down more than 300 times
> per second. How far do they travel?

Maximum allowed bore is 98mm but if all of that were actually used the
stroke would only be 39.75mm and the bore/stroke ratio nearly 2.5. That
would create a horrible combustion chamber shape, create problems with valve
to piston clearance and make it almost impossible to get a decent
compression ratio.

My best guess is in the region of bore 92mm, stroke 45mm for a ratio of
about 2.0 which allows sufficient valve area for good power without creating
too many problems in other areas. The optimisation of the bore/stroke ratio
will have been done long ago during the V10 era and is unlikely to have
changed much when the V8s were mandated as the capacity and number of
cylinders both changed by the same percentage.
--
Dave Baker
Puma Race Engines

Re: What's the bore and stroke of an F1 engine?


"Dave Baker" <Null@null . com > wrote in message
news:fv5cac$56u$1@news.datemas.de...
>
> <PP@2K . com > wrote in message
> news:ojqb14dhbjcckqfdh5nhs42pl0mgc0g48p@4ax . com ...
>> At 19,000 RPM, the pistons are going up and down more than 300 times
>> per second. How far do they travel?
>
> Maximum allowed bore is 98mm but if all of that were actually used the
> stroke would only be 39.75mm and the bore/stroke ratio nearly 2.5. That
> would create a horrible combustion chamber shape, create problems with
> valve to piston clearance and make it almost impossible to get a decent
> compression ratio.
>
> My best guess is in the region of bore 92mm, stroke 45mm for a ratio of
> about 2.0 which allows sufficient valve area for good power without
> creating too many problems in other areas. The optimisation of the
> bore/stroke ratio will have been done long ago during the V10 era and is
> unlikely to have changed much when the V8s were mandated as the capacity
> and number of cylinders both changed by the same percentage.

ISTR reading an "advert/sponsored artical" for detuned (550bhp ish)V10s in an
old Racecar Engineer (I think could have been one of the other journals),
they listed 95mm bore 43.3mm stroke, the con rods were bloody short though at
something like 55mm.

Re: What's the bore and stroke of an F1 engine?


"Depresion" <127.0.0.1> wrote in message
news:rf6dnY0FKY5rVYvVnZ2dnUVZ8surnZ2d@plusnet...
> ISTR reading an "advert/sponsored artical" for detuned (550bhp ish)V10s in
> an old Racecar Engineer (I think could have been one of the other
> journals), they listed 95mm bore 43.3mm stroke, the con rods were bloody
> short though at something like 55mm.

That would give a capacity of 3069cc so it wouldn't have been a legal
combination for an F1 car.
--
Dave Baker
Puma Race Engines

Re: What's the bore and stroke of an F1 engine?


"Dave Baker" <Null@null . com > wrote in message
news:fv7a16$vb7$1@news.datemas.de...
>
> "Depresion" <127.0.0.1> wrote in message
> news:rf6dnY0FKY5rVYvVnZ2dnUVZ8surnZ2d@plusnet...
>> ISTR reading an "advert/sponsored artical" for detuned (550bhp ish)V10s in
>> an old Racecar Engineer (I think could have been one of the other
>> journals), they listed 95mm bore 43.3mm stroke, the con rods were bloody
>> short though at something like 55mm.
>
> That would give a capacity of 3069cc so it wouldn't have been a legal
> combination for an F1 car.

Sorry typo 42.2mm.

Re: What's the bore and stroke of an F1 engine?


<PP@2K . com > wrote in message
news:ojqb14dhbjcckqfdh5nhs42pl0mgc0g48p@4ax . com ...
> At 19,000 RPM, the pistons are going up and down more than 300 times
> per second. How far do they travel?

To two race venues then back to the factory for analysis, sometimes just
one. So differing mileage depending on the calendar with away races
requiring air as well as truck freight. Thousands of miles in any case.
HTH.

Re: What's the bore and stroke of an F1 engine?

On Mon, 28 Apr 2008 15:18:51 +0000, PP wrote:

> At 19,000 RPM, the pistons are going up and down more than 300 times per
> second. How far do they travel?

The bore is very large, and if it carries on to next season we'll all
have a stroke.