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914World.com _ 914World Garage _ Ideal pistons for turbo? Dished or flat top??

Posted by: Mueller Mar 21 2003, 03:07 PM

Compression ratio's equal which is more ideal for a turbocharged motor?

flat top??

dished??

I have a set of brand new (used for 300 miles) 2.0 flat top Euro pistons and cylinders on my current motor. The motor is sitting on my workbench waiting for me to finish putting it back together.

I do not want to drop the motor in a few months when I get around to finalizing a turbo design for it.

Posted by: Dave_Darling Mar 21 2003, 03:36 PM

Just put it together and go. The difference (if any) is not worth the extra hassle of waiting around for a new set of pistons, nor the $$ you'll have to eat from buying a different set of pistons than what you have now.

Put it together and drive it, Mike!

Besides, I'm pretty sure you'll be pulling the motor apart again in three months anyway, no matter which way you go!

--DD

Posted by: echocanyons Mar 21 2003, 03:39 PM

A general rule as I understand it is:

Flat or domed piston=less or lesser combustion chamber(respectively )
This = too a higher compression ratio
a dished piston would have a lower compression ratio for the reverse reasons

Turbo's like lower compression so you can biuld it up with lots o boost

Posted by: echocanyons Mar 21 2003, 03:40 PM

oops I guess I didnt catch that they were the same CR

Posted by: Brad Roberts Mar 21 2003, 03:51 PM

I know what I would use:

Bus pistons or a J+E copy of them. Very thick dished dome that can handle a ton of heat. The tops of the stock Euro pistons is semi thin. Wicker has burned holes in his race engines several times and I get to see the aftermath of running the engines too lean.

B