High Compression ratio
02-06-2009, 07:14 PM
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High Compression ratio
Ok, so this idea has been floating in my head for a while. It seems that an engines compression ratio is limited by what fuel you run. That's what I have summed up. Either way, lets say I wanted to run a 15:1 (or higher) compression ratio in an F20c. Going for a good amount of N/A power. What octane fuel would I have to run to safely do this (100, 106, etc..)?
I realize that everything costs money, but I figure someone with some knowledge could chime in.
Also, with EMS and an ITB setup... I assume 300 whp could easily be obtainable. Correct? This is simply curiosity, and searching gave me random, useless info. Thanks guys.
I realize that everything costs money, but I figure someone with some knowledge could chime in.
Also, with EMS and an ITB setup... I assume 300 whp could easily be obtainable. Correct? This is simply curiosity, and searching gave me random, useless info. Thanks guys.
02-06-2009, 08:23 PM
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i don't have knowledge to chime in, but i do know there is a thread of a build that's at 295 whp. they're running ems and itbs, and they've stroked to 2.4 liters using a k24 crank and custom rods, ported the head to better match their aftermarket header, upgraded the valvetrain, are using toda cams and cam gears, bigger injectors, and upped the comp ratio to 13:1. basically they've done everything imaginable to a n/a motor and they're still having a hard time cracking the 300 whp barrier. so no, it sounds like it's not easily obtainable.
and no comp ratio is not limited by fuel octane, comp ratio is limited by what your engine components can handle without breaking. imo anything above 12:1 is crazy high, 15:1 is unheard of (i've only heard of bike engines going that high). i'm assuming you'd have to custom make your own pistons and head gasket in order to achieve such a high ratio, as no one makes such parts. oh, and 110 octane race fuel is like $8 a gallon and you'd have to special order it.
and no comp ratio is not limited by fuel octane, comp ratio is limited by what your engine components can handle without breaking. imo anything above 12:1 is crazy high, 15:1 is unheard of (i've only heard of bike engines going that high). i'm assuming you'd have to custom make your own pistons and head gasket in order to achieve such a high ratio, as no one makes such parts. oh, and 110 octane race fuel is like $8 a gallon and you'd have to special order it.
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02-07-2009, 07:48 AM
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Yes you can run 14 and 15:1. the key is the fuel your running, Hows the head built, cams your running. remember you can lower your dynamic compression by having a large cam. No you wont bend a rod if it's a Nice aftermarket rod, and your tuning is good.
02-07-2009, 09:13 AM
#9
there are very few s2000 that can make a 300 whp na. inlinepro can make it. they have a 2.4 and a 2.7. 2.4 mention earlier barely could make 300 it was in the 290 marker. the 2.7 only passed 300 by 4-7 whp. so if just raising the comp up and making 300 whp. i think a lot of ppl would already done it.