Compression ratio? what is that?
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http://www.7thgencivic.com/forums/sh...o&pagenumber=2
Some decient stuff in here.
Punch it into google, you'll get a much better explaination. It's a little complicated.
Some decient stuff in here.
Punch it into google, you'll get a much better explaination. It's a little complicated.
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From: St. Louis, Missouri, US
Rep Power: 0 It is fairly technical, but the short answer is the compression ratio is the how much volume in air in the cylinder is compressed into the fuel. For example, 10:1 means ten parts air to one part fuel. Compressing the air/fuel mixture makes it more volatile for the spark to ignite the explosion in the cylinder. That is why, in general, higher compression results in more horsepower. The problems come when you get too much compression and/or crappy fuel which causes detonation (pinging). What happens is the fuel/air mixture explodes before the piston has gotten to tdc (top dead center) and the spark ignites. The effect is to basically hammer the hell out of your pistons/valves/cylinder head.
Joined: Jul 2002
Posts: 13,151
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From: Washington DC
Rep Power: 424 Originally posted by stlblues13
It is fairly technical, but the short answer is the compression ratio is the how much volume in air in the cylinder is compressed into the fuel. For example, 10:1 means ten parts air to one part fuel. Compressing the air/fuel mixture makes it more volatile for the spark to ignite the explosion in the cylinder. That is why, in general, higher compression results in more horsepower. The problems come when you get too much compression and/or crappy fuel which causes detonation (pinging). What happens is the fuel/air mixture explodes before the piston has gotten to tdc (top dead center) and the spark ignites. The effect is to basically hammer the hell out of your pistons/valves/cylinder head.
It is fairly technical, but the short answer is the compression ratio is the how much volume in air in the cylinder is compressed into the fuel. For example, 10:1 means ten parts air to one part fuel. Compressing the air/fuel mixture makes it more volatile for the spark to ignite the explosion in the cylinder. That is why, in general, higher compression results in more horsepower. The problems come when you get too much compression and/or crappy fuel which causes detonation (pinging). What happens is the fuel/air mixture explodes before the piston has gotten to tdc (top dead center) and the spark ignites. The effect is to basically hammer the hell out of your pistons/valves/cylinder head.
Compression ratio in a dumbed down version is the ratio of the cylinder volume at bottom dead center of the stroke, to the volume at the top dead center of the stroke. But you also have to factor in the head gasket thickness, head volume, and the deck height to get it right.
Last edited by Boilermaker1; Aug 6, 2003 at 11:30 AM.
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