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cid conversion to litres 

 

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 Post subject: cid conversion to litres
Posted: Sun Jun 11, 2006 5:07 pm 
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I have been reading a number of posts lately that refer to 347cid Windsors as 5.6L - if I convert cid to litres I get 5.686 which rounded is 5.7L. I think the T-series strokers were 342cid so 5.6L (5.604L) is right for them... has this just been adopted by/for the 347's I wonder.

For that matter, are the 5.0L Windsors still 302cid... if so why are they not still 4.9L (4.948L)?
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Posted: Sun Jun 11, 2006 5:25 pm 
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1000 divided by (2.54x2.54x2.54) will give you the number of cubic inches in a litre

 

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Posted: Sun Jun 11, 2006 5:37 pm 
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Correct, but this doesn't explain why people refer to 347 strokers as 5.6L and 302s are badged as 5.0L.
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Posted: Sun Jun 11, 2006 5:38 pm 
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Yeh well we know that Ford's 302ci is really 4949cc but it sounds better if you round it up.

 

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Posted: Sun Jun 11, 2006 5:49 pm 
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Maybe they round 4.949 up to 4.95 and then round it up again to 5.0... sounds a bit desperate if you ask me. Does anyone know what the actual cid or ml of Holden's 5.0 is (still 307?)?
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Posted: Mon Jun 12, 2006 1:23 am 
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When specing out my 347 build I also wondered why Tickford advertised their strokers as 5.6L. I'm pretty sure they have the '347' crank/rod combo thought..

 

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Posted: Mon Jun 12, 2006 1:54 am 
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holdens are 304's IIRC..

4987cc

 

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Posted: Mon Jun 12, 2006 1:58 am 
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holden early 5.0 was a 308, then because of bathurst (trying to beat the Fords again) they reduced the engine in the VL to 304 (4.9Lt) still called it a 5.0 tho reason being they could shed some 65kg in body weight being under 5.0ltrs. hope that answer your question Free347

 

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Posted: Mon Jun 12, 2006 2:10 am 
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the 347's are actually 342's, do the maths on the specs and you will see what Im talking about.
(4/2)^2x3.14x3.4x8=341.8ci therefore a 342ci displacement compliments of scat cranks, however the ford racing crank PN M-6303B340 also shares this 3.4" stroke and notes on thier 347 kits that it requires a 0.030" overbore to achieve the advertised 347CI

 

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Posted: Mon Jun 12, 2006 10:37 am 
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Yes, your final displacement is determined by the amount of over-bore - the 5.6L/342 runs std bore and the 347 requires 0.03" over which is kinda standard when reworking a 302 anyway I think. Maybe people don't factor this in and are taking the T3's lead when they just refer to their 347 (true 347s) as 5.6L. If my info is right a true 347 works out a fraction bigger than Holden's 5.7L.
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Posted: Mon Jun 12, 2006 3:36 pm 
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Its just like holden with thier gen 3 v8's.
Their capacity is 346ci but they call it a 5.7 for marketing reasons, thats why so many twits call them "350's".
Same as their 308 changed capacity to 304 due to group A specs because their motors were over 5 litres but they were still marketed as 5.0l and yet people still call em "308's".

Just goes to show holden drivers.....

 

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