Engine Displacement

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A

Adam Bryce

Guest
Hey Guys

If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
become




Thanks

ADam
1964 S2a 109 SW
1953 107 pick up
1965 S2A 109 Hard top


 

Adam Bryce wrote:
> Hey Guys
>
> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
> become

You get additional capacity of about 20cc over the 4 cylindres, or less
than 1% increase.

HTH

DaveP

 
Dave P wrote:
> Adam Bryce wrote:
>> Hey Guys
>>
>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>> become
>
> You get additional capacity of about 20cc over the 4 cylindres, or less
> than 1% increase.

0.4 thou ?

Steve
 
On or around Wed, 19 Oct 2005 18:05:44 +0100, Steve
<[email protected]> enlightened us thusly:

>Dave P wrote:
>> Adam Bryce wrote:
>>> Hey Guys
>>>
>>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>>> become
>>
>> You get additional capacity of about 20cc over the 4 cylindres, or less
>> than 1% increase.
>
>0.4 thou ?

I think he means 40. I thought you could take the 2¼ out to 60 thou',
mind...

apparently it's possible to bore out a 499cc Norton single to make it over
500cc.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"There is plenty of time to win this game, and to thrash the Spaniards
too" Sir Francis Drake (1540? - 1596) Attr. saying when the Armarda was
sighted, 20th July 1588
 
Adam Bryce wrote:
> Hey Guys
>
> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
> become

It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.


--
EMB
 
On Wed, 19 Oct 2005 18:37:04 +0100, Austin Shackles
<[email protected]> wrote:

>On or around Wed, 19 Oct 2005 18:05:44 +0100, Steve
><[email protected]> enlightened us thusly:
>
>>Dave P wrote:
>>> Adam Bryce wrote:
>>>> Hey Guys
>>>>
>>>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>>>> become
>>>
>>> You get additional capacity of about 20cc over the 4 cylindres, or less
>>> than 1% increase.
>>
>>0.4 thou ?
>
>I think he means 40. I thought you could take the 2¼ out to 60 thou',
>mind...

You can get 60thou oversize, but Landrover reccomended 40thou as the
maximum overbored on a 2.25. Hence it's more difficult to get the
rings/pistons for 60thou.

Let's face it, if you're plumping for 60thou oversize then either it's
on it's second rebore or it was very badly damaged/worn in the first
place. Worth considering a new engine......

Alex
 

"Alex" <[email protected]> wrote in message
news:[email protected]...
> On Wed, 19 Oct 2005 18:37:04 +0100, Austin Shackles
> <[email protected]> wrote:
>
>>On or around Wed, 19 Oct 2005 18:05:44 +0100, Steve
>><[email protected]> enlightened us thusly:
>>
>>>Dave P wrote:
>>>> Adam Bryce wrote:
>>>>> Hey Guys
>>>>>
>>>>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what
>>>>> does it
>>>>> become
>>>>
>>>> You get additional capacity of about 20cc over the 4 cylindres, or less
>>>> than 1% increase.
>>>
>>>0.4 thou ?
>>
>>I think he means 40. I thought you could take the 2¼ out to 60 thou',
>>mind...
>
> You can get 60thou oversize, but Landrover reccomended 40thou as the
> maximum overbored on a 2.25. Hence it's more difficult to get the
> rings/pistons for 60thou.
>
> Let's face it, if you're plumping for 60thou oversize then either it's
> on it's second rebore or it was very badly damaged/worn in the first
> place. Worth considering a new engine......
>
> Alex

Thanks guys i meant 40 thous just unsure how to write it. the motor was
like that when i got it only found out when i rebuilt the thing


Adam


 

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Adam Bryce wrote:
>> Hey Guys
>>
>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does
>> it become
>
> It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.
>
>
> --
> EMB

Thanks mate


 
I would be grateful if you could also provide us with the calculating
formula for the engine dispacement.

TIA
Pantelis

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Adam Bryce wrote:
> > Hey Guys
> >
> > If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does
it
> > become
>
> It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.
>
>
> --
> EMB


 
Pantelis Giamarellos wrote:
> I would be grateful if you could also provide us with the calculating
> formula for the engine dispacement.

For a 4 cylinder engine

bore * bore * stroke * 3.1416 / 1000

gives capacity in cc if bore and stroke are mm.

Double it for 8 cyl, multiply by 1.5 for 6 cyl .... etc, etc.

Or for the mathematical purists

(bore/2)^2 * pi * stroke * no of cyls / 1000


--
EMB
 
On Thu, 20 Oct 2005 07:36:54 +1300, EMB <[email protected]> wrote:

>Adam Bryce wrote:
>> Hey Guys
>>
>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>> become
>
>It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.

How do you work it out?

Just wondering about my car, into which im currently fitting 1mm
oversive pistons.
 
Tom Woods wrote:
> On Thu, 20 Oct 2005 07:36:54 +1300, EMB <[email protected]> wrote:
>
>
>>Adam Bryce wrote:
>>
>>>Hey Guys
>>>
>>>If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>>>become
>>
>>It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.
>
>
> How do you work it out?
>
> Just wondering about my car, into which im currently fitting 1mm
> oversive pistons.

See my later post in response to the same question from Pantelis.

--
EMB
 
On Thu, 20 Oct 2005 21:12:12 +1300, EMB <[email protected]> wrote:

>Tom Woods wrote:
>> On Thu, 20 Oct 2005 07:36:54 +1300, EMB <[email protected]> wrote:
>>
>>
>>>Adam Bryce wrote:
>>>
>>>>Hey Guys
>>>>
>>>>If my S2A SW has .40 thousand bigger pistons in a 2.25L engine what does it
>>>>become
>>>
>>>It goes from 2286cc to 2337cc if one approximates .040" as being 1mm.
>>
>>
>> How do you work it out?
>>
>> Just wondering about my car, into which im currently fitting 1mm
>> oversive pistons.
>
>See my later post in response to the same question from Pantelis.

Thanks, I need to press the 'get new headers' button more before i
post.
Looks like my car has gone from 1985cc to 2029cc. An increase of 2.2%
i reckon. That might give me an extra horse or two! ;)
 
In news:[email protected],
Adam Bryce <[email protected]> blithered:
> "Alex" <[email protected]> wrote in message
> news:[email protected]...
>> On Wed, 19 Oct 2005 18:37:04 +0100, Austin Shackles
>> <[email protected]> wrote:
>>
>>> On or around Wed, 19 Oct 2005 18:05:44 +0100, Steve
>>> <[email protected]> enlightened us thusly:
>>>
>>>> Dave P wrote:
>>>>> Adam Bryce wrote:
>>>>>> Hey Guys
>>>>>>
>>>>>> If my S2A SW has .40 thousand bigger pistons in a 2.25L engine
>>>>>> what does it
>>>>>> become
>>>>>
>>>>> You get additional capacity of about 20cc over the 4 cylindres,
>>>>> or less than 1% increase.
>>>>
>>>> 0.4 thou ?
>>>
>>> I think he means 40. I thought you could take the 2¼ out to 60
>>> thou', mind...
>>
>> You can get 60thou oversize, but Landrover reccomended 40thou as the
>> maximum overbored on a 2.25. Hence it's more difficult to get the
>> rings/pistons for 60thou.
>>
>> Let's face it, if you're plumping for 60thou oversize then either
>> it's on it's second rebore or it was very badly damaged/worn in the
>> first place. Worth considering a new engine......
>>
>> Alex
>
> Thanks guys i meant 40 thous just unsure how to write it. the motor
> was like that when i got it only found out when i rebuilt the thing
>
40'"
>
> Adam



--
"He who says it cannot be done should not interrupt her doing it."

If at first you don't succeed,
maybe skydiving's not for you!


 
In news:[email protected],
EMB <[email protected]> blithered:
> Pantelis Giamarellos wrote:
>> I would be grateful if you could also provide us with the calculating
>> formula for the engine dispacement.
>
> For a 4 cylinder engine
>
> bore * bore * stroke * 3.1416 / 1000
>
> gives capacity in cc if bore and stroke are mm.
>
> Double it for 8 cyl, multiply by 1.5 for 6 cyl .... etc, etc.
>
> Or for the mathematical purists
>
> (bore/2)^2 * pi * stroke * no of cyls / 1000

You're going to get some biiiig engines with your fist version 4* So this example
would've been a 9l rather than a 2 1/4. Mathematical one looks OK.

--
"He who says it cannot be done should not interrupt her doing it."

If at first you don't succeed,
maybe skydiving's not for you!


 
On or around Thu, 20 Oct 2005 10:26:29 -0000, "GbH"
<[email protected]> enlightened us thusly:

>>
>> Thanks guys i meant 40 thous just unsure how to write it. the motor
>> was like that when i got it only found out when i rebuilt the thing
>>
>40'"

unless you write 0.040" which is unambiguous, and tells a scientist at least
that you mean 0.0395<X<=0.0405; the implied tolerance being half the quoted
significant digits, unless the tolerance is stated explicitly (e.g. 0.04 +/-
0.001, or 0.04 +/-0.0002). Writing 0.04" means 0.035 - 0.045 which is
rather a crappy tolerance for cylinder boring :)

but things in thou' are often written with apparently-superfluous zeros, so
that it's clearer when you have a big list of 'em.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Remember that to change your mind and follow him who sets you right
is to be none the less free than you were before."
Marcus Aurelius Antoninus (121-180), from Meditations, VIII.16
 
Thank you VERY much.

Thinking about it is must be the formula for the calculation of a cylinder's
capacity multiplied by four (for a four pot) or 8 (for a V8) etc.

But the easy way you quoted first is extremely handy.

Thanks again
Pantelis

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Pantelis Giamarellos wrote:
> > I would be grateful if you could also provide us with the calculating
> > formula for the engine dispacement.
>
> For a 4 cylinder engine
>
> bore * bore * stroke * 3.1416 / 1000
>
> gives capacity in cc if bore and stroke are mm.
>
> Double it for 8 cyl, multiply by 1.5 for 6 cyl .... etc, etc.
>
> Or for the mathematical purists
>
> (bore/2)^2 * pi * stroke * no of cyls / 1000
>
>
> --
> EMB


 
On or around Thu, 20 Oct 2005 19:34:44 +0300, "Pantelis Giamarellos"
<[email protected]> enlightened us thusly:

>Thank you VERY much.
>
>Thinking about it is must be the formula for the calculation of a cylinder's
>capacity multiplied by four (for a four pot) or 8 (for a V8) etc.

very minor point: you're calculating swept volume, which doesn't take into
account the volume, if any, of combustion chamber in the head.

The RAC used to have a formula for "horsepower" which didn't take cylinder
stroke into account; since this used to be used for tax rating the motor, it
led to all the old long-stroke motors.

and if you happen to want to know the theoretical horsepower of a
reciprocating steam engine, it's:

P.L.A.N/33000.

Where P = working pressure, L = cylinder length, A = cylinder area and N =
number of working strokes per minute, I think. or maybe per second.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"Quos deus vult perdere, prius dementat" Euripedes, quoted in
Boswell's "Johnson".
 
GbH wrote:
> In news:[email protected],
> EMB <[email protected]> blithered:

>>For a 4 cylinder engine
>>
>>bore * bore * stroke * 3.1416 / 1000
>>
>>gives capacity in cc if bore and stroke are mm.
>>
>>Double it for 8 cyl, multiply by 1.5 for 6 cyl .... etc, etc.
>>
>>Or for the mathematical purists
>>
>>(bore/2)^2 * pi * stroke * no of cyls / 1000
>
>
> You're going to get some biiiig engines with your fist version 4* So this example
> would've been a 9l rather than a 2 1/4. Mathematical one looks OK.
>

Check the maths on the first one - it works just fine for a 4 cylinder
engine. It's the one they teach dumb apprentice automotive machinists
because it's less mentally taxing to use.

If you think about it.... bore/2 is 1/2 * bore

when you square this you get (1/2 * 1/2) = 1/4

and bore * bore = bore^2

so if you leave the 1/2 out of the equation for displacement of a single
cylinder you have the displacement of a 4 cylinder engine.

Simple, and it's correct.






--
EMB
 
Austin Shackles wrote:

>
> very minor point: you're calculating swept volume, which doesn't take into
> account the volume, if any, of combustion chamber in the head.

And strangely enough that's the way all IC engine displacements are
calculated and stated. You only need to know CC volume if you want to
calculate compression ratios.
>
> The RAC used to have a formula for "horsepower" which didn't take cylinder
> stroke into account; since this used to be used for tax rating the motor, it
> led to all the old long-stroke motors.
>
> and if you happen to want to know the theoretical horsepower of a
> reciprocating steam engine, it's:
>
> P.L.A.N/33000.
>
> Where P = working pressure, L = cylinder length, A = cylinder area and N =
> number of working strokes per minute, I think. or maybe per second.


I don't need to know it's HP but I would like a hand next weekend to
light a wee fire in the thing shown in the link below. Dealing with
stuff like this keeps me remembering how technologically advanced a
series LR is.

http://www.railfan.org.nz/images/jpeg/28-3-05/28-3-05_Ja1250(1).jpg


--
EMB
 
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