Compression Ratio
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From: Muscle Shoals AL,
Compression Ratio Ok here is my delima, I am currently in the process of building a iron block408. However I need a little help deciding on what compression ratio is acceptable or common on these engines. My car is a weekend play pretty that I want to be able to run on pump gas. What are your thoughts?
Heads and cam have still to be determined, as I need to pin point this issue first, then I can build them around that.
Heads and cam have still to be determined, as I need to pin point this issue first, then I can build them around that.
Depends on the cam and your cooling system. If you have a big nasty cam in there, your IVC will be late and you won't build as much cranking compression. So it's a good idea to throw more compression at it to build torque and make it more streetable.
More compression generates more heat as well, so having a good cooling system that can keep everything running optimally will also help fight off pre-detonation.
What cam are you going with? Need specs at .006" of lift, not .050".
More compression generates more heat as well, so having a good cooling system that can keep everything running optimally will also help fight off pre-detonation.
What cam are you going with? Need specs at .006" of lift, not .050".
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From: Muscle Shoals AL,
Depends on the cam and your cooling system. If you have a big nasty cam in there, your IVC will be late and you won't build as much cranking compression. So it's a good idea to throw more compression at it to build torque and make it more streetable.
More compression generates more heat as well, so having a good cooling system that can keep everything running optimally will also help fight off pre-detonation.
What cam are you going with? Need specs at .006" of lift, not .050".
More compression generates more heat as well, so having a good cooling system that can keep everything running optimally will also help fight off pre-detonation.
What cam are you going with? Need specs at .006" of lift, not .050".
Joke's advice was dead on. The larger the cam you run, the more compression you'll want to run to make it streetable. To the point of running pump, dynamic compression, which is determined by your cam and static compression will be more important than static compression alone. The more overlap your cam has, the more static compression you'll bleed off allowing you to run pump gas. Personally, I'd statically shoot for Static in the 11.5:1 range and dynamic in the 8.5:1 range. You'll be fine on pump, and have a fun street car!
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Thread Starter
TECH Regular
iTrader: (7)
Joined: Aug 2009
Posts: 444
Likes: 2
From: Muscle Shoals AL,
Joke's advice was dead on. The larger the cam you run, the more compression you'll want to run to make it streetable. To the point of running pump, dynamic compression, which is determined by your cam and static compression will be more important than static compression alone. The more overlap your cam has, the more static compression you'll bleed off allowing you to run pump gas. Personally, I'd statically shoot for Static in the 11.5:1 range and dynamic in the 8.5:1 range. You'll be fine on pump, and have a fun street car!
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