6 replies to this topic

[Leonard]

i want to drop the compression ratio to about 8.5 to 1. blocks being measured at the mo, and hopefully wont need a rebore. my question is, can enough material be removed from the head chambers to drop the cr this far, or will the pistons have to re-dished as well?

[Turbo Nick]

im using 11cc dished pistons with a 29cc head giving me 8:1, i think standard turbo pistons are about 12cc so yeah 8.5:1 will be no probs with head work alone.

[flamin']

Whats the advantages and disadvantages of high/low CR's ? thanks, keith. :wales:

[Sprocket]

Low CR = silly boost pressures

High CR = dicing with detonation

Some where inbetween = reliability

Depends what yo want and how often you want to rebuild.

[Bluemini]

You can take loads out of the head. Heres one I was doing for our very own Dave aka mighty_mini...

Attached Files

•  Turbo_Head_2_0001.jpg   243K   17 downloads

[Turbo Phil]

What cc did you manage to get that out to in the end ?

Phil.

[mighty_mini]

it was 28.5cc after they were all matched, i think.