TRW pistons and compression ratio

[92Ty#1524]

Im running TRW L-2441 pistons with a .030 overbore.

Read something on http://syty.org/old/modlist.html regarding the need to "skim" the pistons to bring the compression ratio back to stock "especially with .030 over..".

Has anyone had to do this? I could use some specifics before I take them to a machinist (if need be).

 

[jwaller]

L24421 should be close to the raight ratio. esp if you havent zero decked your block. I wouldnt worry about it...

the highest you might see is 8.3:1

 

[DanenGraham]

If you went to the Vortecs your comp ratio will be higher as well.

 

[92Ty#1524]

You mean heads? Using L-35s.

 

[GEN3Typhoon]

I had nearly the same setup and if I remember correctly I got 8.45:1 when I figured it.

Not a significant difference...

 

[Lynn D. Brown]

TRW's

TRW's

No big deal if the CR went up a little bit, just lower the boost accordingly. I have Vortecs and I guess that puts my CR somewhere around 9/1. Be damned if I'm going to do a bunch of work to LOWER the CR back down. Cylinder pressure is cylinder pressure, however U get it.

But let's not get into that endless thread again.

 

[Sy769]

Re: TRW's

Re: TRW's

No big deal if the CR went up a little bit, just lower the boost accordingly. I have Vortecs and I guess that puts my CR somewhere around 9/1. Be damned if I'm going to do a bunch of work to LOWER the CR back down. Cylinder pressure is cylinder pressure, however U get it.

But let's not get into that endless thread again.

Cylinder pressure is not just cylinder pressure. Lower static CR with higher boost will make more WOT power at the sacrifice of off boost torque.

Sorry if I start a endless thread

 

[Lynn D. Brown]

Boost vs CR, again

Boost vs CR, again

OK, sounds good Patrick. So, if Ur a heavy racer always pushing 4 more, more boost may be better, but if U R a street-strip kinda guy, who will be happy to be in the 11's and stop there, I'd go the other way. I just don't like humongous boost and all the problems that come with it.