Dynamic Compression Help
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Joined: Apr 2007
Posts: 528
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From: Charelston, Illinois
Dynamic Compression Help
I am working on a 302 rebuild for my father’s 1932 3 Window Coupe. I am writing to see if you guys can help me with Dynamic Compression and to see if I am calculating correctly.<O
</O
<O</O
The engine is out of a 1996 Ford Explorer with the GT40 heads. I will be converting the engine from EFI to carb. I pulled one of the heads and measured the cc’s at 65. Further, I measured the piston (Sealed Power H816CP) down in the hole .010. Based upon this basic information and the information listed below, it looks like I need a camshaft with a 50-55 Advertised Intake Closing Angle to get my dynamic compression around 7.5 to 7.7 (I am using Pat Kelley’s Dynamic Compression Calculator). I have been told that a dynamic compression of 8.0 is ideal for a street engine. Am I calculating this correctly? <O</O
<O</O
Engine bore = 4.00<O</O
Crank Stroke = 3.00<O</O
Rod Length = 5.091<O</O
Combustion Chamber Volume = 65cc<O</O
Head Gasket Thickness = .039<O</O
Piston to Deck Clearance = .010<O</O
Dished Pistons (Sealed Power H816CP) = 4cc<O</O
Head Gasket Bore = 4.100<O</O
Any help would be much appreciated.
</O<O
</OThe engine is out of a 1996 Ford Explorer with the GT40 heads. I will be converting the engine from EFI to carb. I pulled one of the heads and measured the cc’s at 65. Further, I measured the piston (Sealed Power H816CP) down in the hole .010. Based upon this basic information and the information listed below, it looks like I need a camshaft with a 50-55 Advertised Intake Closing Angle to get my dynamic compression around 7.5 to 7.7 (I am using Pat Kelley’s Dynamic Compression Calculator). I have been told that a dynamic compression of 8.0 is ideal for a street engine. Am I calculating this correctly? <O
</O<O
</OEngine bore = 4.00<O
</OCrank Stroke = 3.00<O
</ORod Length = 5.091<O
</OCombustion Chamber Volume = 65cc<O
</OHead Gasket Thickness = .039<O
</OPiston to Deck Clearance = .010<O
</ODished Pistons (Sealed Power H816CP) = 4cc<O
</OHead Gasket Bore = 4.100<O
</OAny help would be much appreciated.
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