lsxnoobneedhelp

LIKE MY NAME SAYS
The engine builder told me the compression ration will be 11:2:1 with the parts I'm using, but when I put in the info into a compression calculator, it comes out wrong

Its a lq9 bored to a 408 (4.03" bore/4.00" stroke)
-3cc wiseco flattop pistons
68cc ls3 aftermarket heads
.051" head gasket
and a lq9s deck clearance is 9.24

When I put all this into a compression calculator, it came out to be 1.42:1

Werewolf SS

iTrader: (3)

Your builder is correct. Your combination would be a 11.2 : 1 .The calculator you used is either messed up or a value was incorrectly entered. I have the same setup except my pistons are -1.8cc and my headgasket is .041 and that gives me a 11.6 : 1 ratio.

98TransAmWs-6

iTrader: (11)

You are doing something wrong then. I did the calculation and it comes out to 11.23:1.

lsxnoobneedhelp

What calculator are yall using

Werewolf SS

iTrader: (3)

just type in compression calculator on google. Most use the first one but any of them should be fine. Deck height is only used to figure out if your piston is going to stick out of the hole any. No calculator will you actually put 9.24 for deck height. I think that might be what has messed you up.

lsxnoobneedhelp

I think that's it too, what should I put for deck height when I try to calculate it?

Werewolf SS

iTrader: (3)

zero unless you know if the piston will stick out a certain amount (somewhat uncommon with aftermarket pistons to my understanding.)

lsxnoobneedhelp

Awesome, thanks for the help