droping the compression

marco the steem engine · Sat Nov 10, 2001 9:19 am

my engine has 10.5-1 compression I want to drop it to 8-1,
This is the problem,
in the head there is only 14cc(litrealy flat), with most of the cc in the piston(45cc)and .030thou of deck hight.
I need 65cc in the piston for the correct compresstion.
Im thinking of using a flat forged piston and run 0.350 of deck hight.
I'm going to run 20psi of boost .

I know people try to keep the deck as low as possable for the squish but is it that important on a turbo motor?

The head is flat the piston is flat no hot spots for detionation!

any thoughts would be much appreciated.
thanks.

FULL STEAM AHEAD!!!

Magoo · Post by **Magoo** » Sat Nov 10, 2001 6:35 pm

Dave Kawell told me he would run as much deck as needed to get the c/r right ....and unless you are going to run race gas exclusively,better rethink that c/r....

Steve C · Post by **Steve C** » Sun Nov 11, 2001 3:42 am

Hi Marco
Just buy some factory 9:1s and machine the dish a little more to get 8:1. A friend of a friend is a running a supercharged 2.1 wasserboxer in Western Australia, Im trying to find out what sort of pistons he is using.
Steve C

marco the steem engine · Sun Nov 11, 2001 4:22 am

Unfortunatly the wasser pistons are not forged and machine the dish a little will weeken them even more, theres no way that there going to hold that amount of boost/hp, I was thinking 7/7.5-1 but wanted to see what people thought.
so is it OK to run that much deck?

Steve Arndt · Post by **Steve Arndt** » Mon Nov 12, 2001 11:33 pm

JE or Wiseco will build custom pistons for you. They could model off your stock wasser piston and use a tigher, higher positioned ring package, move the wrist pin up, and thereby lower the compression.