Hey guys, ive been looking all over and I cant get a clear cut answer on what combustion chamber size you want to go with when applying boost. Smaller or larger? The only answers I find are the hole twisted wedge vs AFRs argument... lol... Thanks
Chamber size for boost
- Thread starter BlkoutGT
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AaRoN
King Post Whore
A larger chamber means less compression. What's the general rule for cars with forced induction?
2REDSTANGS
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lower compression is good for de boost
I know with low compression you can run a ton of boost. Wich is a nice option since I will always be looking to go just a lil faster.lol. But I read somewhere that with say: a smaller chamber it acts as a restriction but at the same time creates more pressure, or somthing to that effect. Could somone clear that up if possible? So a bigger chamber would be optimal, weather a engine has low/higher compression, for boost?
ah, here we go ok it depends on several factors... turbo vs s/c roots vs centi 9.5:1 is a good ratio but for superchargers since they are belt driven and can be boosting at lower rpms... where as a turbo might not start into boost till around 3000 rpms using 9.1:1 compression makes the car dead on the bottom end but booting hard up top...
10.1 is a good a good well rounded compression ratio for turbos but a lot of guys go 9.5:1 for boosted engines, but again going by the application can tell you more of the compression ratio you should go with
10.1 is a good a good well rounded compression ratio for turbos but a lot of guys go 9.5:1 for boosted engines, but again going by the application can tell you more of the compression ratio you should go with
Say the application is something like a turbo'd 351 (possibly stroked) what size chamber and compression ratio would be ideal? Also would it be better to have the turbo hit hard lower or more up top (regaurding how hard it would be getting the power to the ground)? This is a idea ive been kicking around, wondering if i should head in this direction.
imo you want to turbo to ease on like a 9.5:1 or 10.1:1 some guys have even done 8.5:1 compression for turbos so it al depends on turbo size and several other things. I don't know too much about 351's because i'm a modular guy, but from what little i do know i'll help with
I figured it would be better for the turbo to ease on, especially since 351 based engines are known for high torque output, but its always better to get a second opionion. I will ber piecing this all together eventually. So would it be better to have like a 58cc chamber or like a 70cc chamber for a turbo application? I know compression has alot to do with it but that could be changed by the kind of pistons too, so Im just focusing on the heads right now. Thanks guys!
