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Old 02-11-2005, 10:07 PM
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what cylinder pressure???

Im planning on Building a Hot street/strip 383 and im wondering about what would be a safe cylinder pressure to run on pump gas with aluminum heads. Im trying to get as much compression as i can without detonation. The cam im going to run builds alot of cylinder pressure quickly because of fast opening intake ramps and faster closing ramps. Im wanting to get the best quench i can and still be safe if problems occur. what is everyones opinions about zero decking the block? my engine builder says he doesnt really like zero decking even in race motors just because of the fact that if something does fail, its not as prone to destroy everything. He says he usually sets pistons about .010 in the hole. Im going to be running good rods and pistons, and i would like to have between 10.0 to 1 and 10.5 to 1 compression. The higher the cylinder pressure is, the more heat is made, therefore the more likely to cause detonation. Im wanting as much cylinder pressure as i can get with 93 octane pump gas and still be safe, with a good quench. Thanks for any suggestions

Oh and one other thing, about how much compression loss can be expected from going from a 64cc head to a 68cc?? thanks

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Old 02-11-2005, 10:24 PM
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Make sure you upgrade your cooling system also ...or your mods and your engine will not handle the heat.

Great post.
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Old 02-11-2005, 10:24 PM
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Maybe Some Helpful Info

I don't know if you've worked thru this or not, but it might help shed a little light on your goal.

http://members.uia.net/pkelley2/DynamicCR.html
http://cochise.uia.net/pkelley2/index.html
http://www.smokemup.com/auto_math/index.php


Here's one that made amazing power on only 87 octane!
http://chevyhiperformance.com/techar.../148_0401_imp/
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Old 02-11-2005, 11:15 PM
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Yeah im definitely upgrading my cooling system, i already have an electric fan and i ordered a Be cool radiator to fit my app. Those articles helped some i suppose, ill just have to discuss that stuff with my engine builder and hope he understands all that. thanks
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Old 02-12-2005, 12:46 PM
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will i be safe with 10.1 static compression and a cam that builds alot of cylinder pressure quickly? What are all the views on zero decking the block? thanks
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Old 02-12-2005, 01:04 PM
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comp ratio

I never pass 10.8 on a street car.
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