327 compression ratio - Team Camaro Tech
2000年7月24日 · Using Pat Kelly's calculator your dynamic compression ratio is a little over 7.0:1 with the .039 gaskets and a little over 7.4:1 with the .018 gaskets, which is basically saying your cam is too big for your combo, or your compression is too low for that cam. You want to shoot for around 8.0 dynamic compression for a street car.
400 SBC COMPRESSION RATIO - Team Camaro Tech
2002年12月7日 · The aluminum heads made like 1 HP more than the iron and that was with the same compression ratio. They were THAT CLOSE. If you had compared as cast runners in both heads and bumped compression up a point on the aluminum head motor, they would have made identical numbers - and MAYBE the aluminum head engine would have come out on top.
Compression ratio - Team Camaro Tech
2000年3月9日 · A combination of low LSA and long duration is what you want with high static compression ratio, which is exactly what you did. The OEMs did this in the 60s to support the 12 to 13:1 compression ratio engines they built. A high LSA (112-114 degrees) and long duration would be knock city.-----
383 sbc with 11:1 compression ratio - Team Camaro Tech
2021年4月4日 · There's more to it than just static compression ratio. I ran 10.9:1 in my '69 Camaro when it was a daily driver on 91 octane pump gas. The cam had almost 30 degrees more duration at 0.050" than your cam and the stroke was only 3.48", but the ICL was 102 so it cranked 215-230psi on a cold compression test.
327 Compression ratio - Team Camaro Tech
2008年4月15日 · My proposal considers future options; such that, .005" + say a .030" (Composite Gasket) = .035 Quench which is optimum and you got another .009" to work with available gaskets plus you can always take more off the head if you ever decide you want more compression pending Piston to Valve clearances. Just my opinion ))
compression Ratio Riddle - Team Camaro Tech
2024年11月13日 · Being the second rebuild on this motor, I’m questioning every original decision including current compression ratio which I’ve calculated to be 11.1:1 Australian pump gas isn’t as stable as American and I’m beginning to think anything north of 11 is too high for the street. Here is the set up Head gasket 0.039” thick 454 - 60 over 4 ...
Explain the pros & cons of compression - Team Camaro Tech
2010年1月7日 · Compression ratio is a static measurment of the volume of the cylinder at top dead center vs the volume of the cylinder at bottom dead center. What's really important is dynamic compression ratio. This throws the camshaft into the calculation, as compression cannot actually happen until the intake valve has closed.
Compression for cams - Team Camaro Tech
2002年2月20日 · Dynamic compression ratio works out to about 7.59:1 for the XE274, and 7.36:1 for the Magnum 280. This is a little bigger difference than I expected, but they are still pretty close. While idle quality will be nearly identical between the two cams (driven by overlap which IS identical), the XE274's smaller intake lobe (dual pattern cams all ...
Engine cam choice - Team Camaro Tech
2024年11月22日 · Also important is the intake valve closing @ .006" because that ultimately determines the dynamic compression ratio. They work out to be very similar (63, 66), so both keep the DCR in the same range (~8.3-8.5 range) to keep it efficient on pump gas as well (both part throttle and WOT).
Higher Compression vs. Timing Advance - Team Camaro Tech
2009年1月20日 · Maybe it should be phrased as "reasonable compression for pump fuel with optimum timing vs. higher compression with reduced timing to stop detonation". This is often the case when one goes too far with the compression & then tries to pull timing so it can be driven on pump fuel. In this case the motor with the correct timing will do better.