ok.. i always get this mixed up... if i use a piston made for a GSR motor netting a 12.3:1 compression ratio.... this would make for a 12.0:1 when used in a Type-R motor correct?

thanks!

 

cr = max cylinder volume / min cylinder volume = (Vd + Vc) / Vc

Vd = displaced volume (ie, bore x stroke)
Vc = clearance volume (ie, everything left... space from head gasket, combustion chamber)

cc both pistons and figure it out for us. anyone ever cc'd both heads?

D

 

Here we have the two extremes!!! hahahahaha.....

Even though he said "math" D, TurboR616 was just looking for a yes or no answer (but then we all knew that, right)!

The B18C1 motor' head is listed as CC'ing @ 41.6 (cc)
From what I remember reading the C5 head might be as much as 5 cc more.

But as far as the original question, YES ... the compression would be lower in the Type R motor due to the increased combustion chamber volume.


[Modified by zygspeed, 2:00 PM 10/23/2001]