in running 8.5 compression ratio with the hopes of putting a turbo one day

 

Lower power and gas mileage.

 

so it wouldn't hurt the engine

 

it'll hurt your pride when you try to drive it...

 

8.5 compared to 9.0 compression is only about a 25hp difference.
So it will be slightly underpowered till you put the turbo on.
Otherwize, wont hurt anything.

Phil

 

i always was told you wanted to lower your compression ratio when your putting forced induction on???

 

unless your gonna be running like 12psi or more there really isn't a point in running a lower comp. in boosted motors.

 

What did you do to raise compression, PI swap, pistons? Or is your engine caked with carbon lol.

 

I would stick with the 9 - 9.5 range for a centri or turbo. Most daily driving is not in boost (90%(?)) so losing that little extra low end hp would be missed...if your always racing, that's another story.

 

well from what I read I should have about 8.5 compression ratio for forced induction and also that I should not go above 10:1 on the ratio, if that is not the case what should the compression be on the motor before I put the turbo on and how much will it go up afterwords, keep in mind this is all on paper I am trying to price out the list of parts for a navi engine and the pistons is the only thing stopping me