Compression Ratio Calculation
03-23-2009, 06:26 PM
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Compression Ratio Calculation Does anyone have a formula to calculate static compression ratios for assembled engines? I figure X= bottom end compression and Y= top end compression, so X + Y = Total static compression????? or is it X(Y)/2?
I'm asking because in the next year or so I'll be starting my FI build, and I'm in the planning phase now and I want to make sure my numbers are right. The Lunati 395 Stroker Kit seems to be the direction I'm going in. The kit is offered in 3 different compressions :
8.7:1
10.4:1
12.2:1
In my mind, the 10.4:1 would be the wiser choice to use with say and LS head with these specs:
Combustion Chamber: 72cc
Intake Runner: 227cc
Exhaust Runner: 70cc
Intake Valve: 2.055"
Exhaust Valve: 1.57"
(Patriot Performance LQ9 Stage II)
Which advertise a drop from 10.1:1 to 9.0:1 on a stock LS1. So if X(Y)= Z, am I looking at a 9.5:1 compression?
I don't mean to seem like a bother, but I love this FI section, it's physics class all over again!!!!!!!!!
I'm asking because in the next year or so I'll be starting my FI build, and I'm in the planning phase now and I want to make sure my numbers are right. The Lunati 395 Stroker Kit seems to be the direction I'm going in. The kit is offered in 3 different compressions :
8.7:1
10.4:1
12.2:1
In my mind, the 10.4:1 would be the wiser choice to use with say and LS head with these specs:
Combustion Chamber: 72cc
Intake Runner: 227cc
Exhaust Runner: 70cc
Intake Valve: 2.055"
Exhaust Valve: 1.57"
(Patriot Performance LQ9 Stage II)
Which advertise a drop from 10.1:1 to 9.0:1 on a stock LS1. So if X(Y)= Z, am I looking at a 9.5:1 compression?
I don't mean to seem like a bother, but I love this FI section, it's physics class all over again!!!!!!!!!
