SR20 aftermarket pistons
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Joined: Aug 2004
Posts: 47
From: West palm beach FL
SR20 aftermarket pistons
whats up.... i want to start building my SR blacktop.. but dont know where to get pistons with a compression ratio of 7 to 1... if anybody knows please let me know... and if any body knows of a aftermarket crankshaft please let me know... thanks
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Joined: Nov 2004
Posts: 21
DISCLOSURE : None of this post probably makes sense. I've been working for 15 horus straight and quite loopy.
Power is direclty effected by your compression ratio. The more compression the more power. The less compression, the less power. The benefit of lower compression is resistance to precombustion. Increased charge compression and temperature there from will cause knock. Bad. Lower compression allows that max pressure to be reached more from charge air pressure and less cylinder compression. Two major advantages of that are the fact that 1) you have a denser charge. more air. more fuel. 2) post compression(turbo) you've created heat. same when you compress with your piston. but the advantage is you can use some sort of charge cooler (intercooler/aftercooler/etc/etc) to remove portions of that heat. But back to your question, you simply will be getting less power from your charge with lower compression. Your benefit comes from your boost spectrum, but at a sacrifice. That's the reason many street turbos will run around 9:1. You get more 'off-boost' power at the sacrifice of less boost potential (with identical other parameters(octane, timing, etc), but with more overall street drivability.
Power is direclty effected by your compression ratio. The more compression the more power. The less compression, the less power. The benefit of lower compression is resistance to precombustion. Increased charge compression and temperature there from will cause knock. Bad. Lower compression allows that max pressure to be reached more from charge air pressure and less cylinder compression. Two major advantages of that are the fact that 1) you have a denser charge. more air. more fuel. 2) post compression(turbo) you've created heat. same when you compress with your piston. but the advantage is you can use some sort of charge cooler (intercooler/aftercooler/etc/etc) to remove portions of that heat. But back to your question, you simply will be getting less power from your charge with lower compression. Your benefit comes from your boost spectrum, but at a sacrifice. That's the reason many street turbos will run around 9:1. You get more 'off-boost' power at the sacrifice of less boost potential (with identical other parameters(octane, timing, etc), but with more overall street drivability.
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