B20 go BOOM- Carnage inside!

[koukis14]

So let me get this straight... High compression turbo builds can be done???

I always wondered why tubo build would try to have lower compression ratios when all motor builds yeild more hp with higher compression ratios. Figuratively speaking, if the walls and combustion threshold could take it, high compression turbo builds would spool faster?

dude really?

[TheChosenOne]

dude really?

Lol. Yes, Dude, really.

I don't know that much about boost. That's why I asked. Sooo... can u explain why? I really don't feel like getting flamed, so if you could explain, then by all means go ahead, but if not then keep it moving, Partner!

[koukis14]

Lol. Yes, Dude, really.

I don't know that much about boost. That's why I asked. Sooo... can u explain why? I really don't feel like getting flamed, so if you could explain, then by all means go ahead, but if not then keep it moving, Partner!

Engines run off of controlling explosions, thousands of them a minute. The more air and fuel the bigger the bang, the more power you make. In an N/A motor you are not forcing air into the motor so the more you squeeze what air and fuel you have(compression ratio) the more powerfull the "bang". With forced induction(turbo/supercharging) you are forcing air in and with more fuel to compensate and hit that magical 14.7 - 1 a/f ration you make a bigger bang.

With a high compression N/A motor or a lower compression forced induction motor you have to reinforce internal engine parts to compensate with the extreme conditions. If you mix both of these together you will make huge power.......but not for long. Example, Top Fuel dragsters have a 12.1 compression ration and a supercharger bigger than most Honda engines.....those motors make over 8000 yes eight thousadn hp, are rebuilt after every 4.5 second pass.

Tuning also plays probably the biggest roll making a high comp motor last. There are high compression forced induction cars running around......mostly S2000s. If you do not run extreme amounts of boost and have someone tuning it that knows what they are doing......Battleground.....they will last for a while. It is just safer, easier, and cheaper to run one or the other...not both.

[TheChosenOne]

Engines run off of controlling explosions, thousands of them a minute. The more air and fuel the bigger the bang, the more power you make. In an N/A motor you are not forcing air into the motor so the more you squeeze what air and fuel you have(compression ratio) the more powerfull the "bang". With forced induction(turbo/supercharging) you are forcing air in and with more fuel to compensate and hit that magical 14.7 - 1 a/f ration you make a bigger bang.

With a high compression N/A motor or a lower compression forced induction motor you have to reinforce internal engine parts to compensate with the extreme conditions. If you mix both of these together you will make huge power.......but not for long. Example, Top Fuel dragsters have a 12.1 compression ration and a supercharger bigger than most Honda engines.....those motors make over 8000 yes eight thousadn hp, are rebuilt after every 4.5 second pass.

Tuning also plays probably the biggest roll making a high comp motor last. There are high compression forced induction cars running around......mostly S2000s. If you do not run extreme amounts of boost and have someone tuning it that knows what they are doing......Battleground.....they will last for a while. It is just safer, easier, and cheaper to run one or the other...not both.

Thanks Mang! +1. BTW, what is the compressionn ratio of a s2000?

[koukis14]

Thanks Mang! +1. BTW, what is the compressionn ratio of a s2000?

Off the top of my head 11.5 to 1 but I am not sure.

[GTScoob]

Lol. Yes, Dude, really.

I don't know that much about boost. That's why I asked. Sooo... can u explain why? I really don't feel like getting flamed, so if you could explain, then by all means go ahead, but if not then keep it moving, Partner!

Well basically most turbo motors run low compression internals so they can run lots of boost (figure 15+ psi). In the case of most turbo kits for originally NA motors they limit boost to 7psi but make the same amount of power. High boost and high compression can work if you've got race gas or even better, meth injection to fight off detonation. You'd also need bitching cylinder reinforcement and strong pistons.

When doing a big $$ build you'll figure in your turbo, the ideal operating boost for it and set your CR around that. Higher CR will spool the turbo quicker and have more off-boost response but may not last as long. Lower CR will be opposite.