High compression, equals?
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speadfreak
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- Oct 13, 2005
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more compression makes more power. More compression makes more heat. More heat means your engine will detonate or spark knock easier. I have seen guys build higher compression engines, then crank the timing back so far to run pump gas that it defeated the purpose of the higher compression in the first place. Both forced induction and higher compression create more pressure in the cylinder, making more power when tuned properly. Nitrous is sorta the same principle, it basically creates a greater pressure in the cylinder. Basically, the more dense that you can make the air and fuel volume in the cylinder, the bigger the explosion will be when it is ignited. The bigger the explosion means the piston is pushed down with more force=more power. I hope this might have helped and not confused more. Now with adding more cylinder pressure, the engine will be moving alot more air into the cylinder and pushing alot more exhaust gas out.......this is where free flowing exhaust and intake components come into play. I'm one of those people who knows how things work, but have a hard time putting into words
speadfreak
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. What would be, in your opinions, a nice nitrous 331 stroker build compression ratio?
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There is two types of compression
1. Static
2. Dynamic
Static compression is what your motor is rated, the difference between the total volume of the cylinder at bottom dead cylinder (piston all the way down) and the volume it is compressed to at top dead center. (piston all the way up)
Dynamic compression is much different. The compression ratio changes with rpm, different cams, heads, induction systems (blown or naturally). It has to do with the actual amount of air that is drawn into the cylinder and how much it is compressed. That is the important one.
If you want to know more, it's too complex for me to sit here all night and type, and I'm no expert, but do a search and I am sure you'll find it.
1. Static
2. Dynamic
Static compression is what your motor is rated, the difference between the total volume of the cylinder at bottom dead cylinder (piston all the way down) and the volume it is compressed to at top dead center. (piston all the way up)
Dynamic compression is much different. The compression ratio changes with rpm, different cams, heads, induction systems (blown or naturally). It has to do with the actual amount of air that is drawn into the cylinder and how much it is compressed. That is the important one.
If you want to know more, it's too complex for me to sit here all night and type, and I'm no expert, but do a search and I am sure you'll find it.
Dynamic compression begins once the intake valve is closed I believe....
Here is a pretty detailed article on dynamic compression:
http://cochise.uia.net/pkelley2/DynamicCR.html
Here is a pretty detailed article on dynamic compression:
http://cochise.uia.net/pkelley2/DynamicCR.html
5spd GT said:
Pretty complex. Say you have a blower at 7-8psi, you are effectivly adding half another atmospheres, so a 9.0:1 is now a 13.5:1 compression motor, but because of the restrictions in the intake, heads, and exaust, not all that air can be pushed in the motor, so determining how much actual air is getting into the cylidner is dynamic compression. (I think I'm right, correct me if I'm wrong).
Oops, I was wrong, looking at cylinder pressure, your right 5 speed, it's when the valve closes.
cjman15
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cjman15
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Would you just need to keep the compression under like 10:1?
I'd like to do a 347 stroker in the future and have a blower too.
I'd like to do a 347 stroker in the future and have a blower too.
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