[doc] Odd fire vs even fire PRV

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Hi All

Having finally got around to stripping down my Renault 25 turbo engine, 
I thought some people might be interested in the differences between it 
and the DeLorean engine.

The DeLorean is an odd-fire with shared crank pins. Renault made it 
even-fire by offsetting the crank pins.

http://www.delorean.co.uk/cranks.jpg

(DeLorean top / R25 bottom - the picture makes the left hand crank pin 
look solid, but trust me, they are all the same!)

This particular engine has a capacity of 2458cc which is achieved with a 
91mm bore (same as the DeLorean) and a 5mm shorter stroke. This 5mm then 
goes into beefing up the pistons, which are -not- forged, although the 
conrods are. Hopefully this photo will show the increased height of the 
crown, and the considerably larger little ends. DeLorean right, R25 
left. (the R25 piston has one of its shells missing - I'll be changing 
them anyway but didn't think of that when I grabbed it for the photo)

http://www.delorean.co.uk/pistons.jpg

All the best

Martin


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