M20 engine specifications

[Insanity]

If anyone can provide me with these figures, I'd be grateful:

Piston heights for the factory e, supereta and 325i pistons.

combustion chamber volume for the 325i head.

wrist pin location on those pistons.

[Jordan]

885 head is ~43cc or so.

[Insanity]

Well.. this is odd then. If the 325i head is 43cc, then a flat-top piston should give a 9.66:1 static compression ratio. But isn't the static compression of the M20B25 is listed at 8.8:1? And don't the pistons have a bit of a rise into the CC?

[Insanity]

Hm, I actually did a calculation wrong (forgot to add CC volume to cylinder volume before dividing), and with a flat top at deck height, the static CR should be 10.2:1..? Odd...

[Insanity]

Hm, after some googling, seems the CC volume stock on the m20b25 is actually 47cc, which makes a flat top at deck height yield a 9.8:1, which still seems off.

[Insanity]

Ah, forgot the head gasket. 9.2:1 with a flat top. Sounds more reasonable, especially since the stock pistons apparently have a dish...

[Jordan]

Having a nice thread all by yourself?

[Insanity]

Well, since nobody seems to know anything about the specs of the engine, looks like I have to.

[Jordan]

You seem to be doing just fine by yourself...