amid

my compration in cylinders is
1 190
2 198
3 194
4 204
so how can i find my num like 11:1 ? my moter compr was 10:2
i put spoon gasket plus litle milding to head to raise my compration and the readings was the uper ....so which is my compration now ?

imported_TURBO

http://falconperformance.sundog.net/compcalculator.asp

imported_94EG6HB

piston moves up and compresses the trapped air fuel mixture that was brought in by the intake stroke....

The amount that the mixture is compressed is determined by the compression ratio of the engine...

The compression ratio on the average engine is in the range of 8:1 to 10:1...

This means that when the piston reaches the top of the cylinder, the air-fuel mixture is squeezed to about one tenth of its original volume...

You are talking bout two different things..

bbarbulo

iTrader: (2)

Typical cyl pressures are between 150-220 psi. At about 100-120 psi the engine won't run... Seems to me you got a pretty strong engine. BUT, I'm not sure if the comp ratio and cyl pressures are mathematically related... seems to me they should be, but I have yet to see a formula to convert the two.

imported_gatherer

bbarbulo I don't think they are since the general rule is your running with a strong engine when it's around 200 PSI regardless of compression ratio.... however I think the compression ratio affects how long (turns of the crank) it takes to get that reading possibly....

to get the volume of the cylinder take the stroke and multiple by the cross sectional of the cylinder, then you'll also need the volume of the combustion chamber and the volume of the piston and then you can go from there to calculate the compression ratio.

amid

iam comfused............so my motor is strong or not ? is the spoon head gasket effect this nums or no ? can anybody tell me my compration num in my b16a1 ?