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JohnJL JohnJL is offline
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Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,717
Thanks guys,
I cc'd my heads and am quite surprised. I am using Jim's calculations as I don't have 'jo blocks.'

Head volume
Cylinder 1= 83cc
Cylinder 4= 84cc

Stroke
7.04 (standard 3.0)

Vapt
Cylinder 1 = 41cc
Cylinder 4 = 41cc

Bore
95mm (standard 3.0)

Height
Cylinder 1 = 6.0cm
Cylinder 4 = 5.96cm

By my calcs, I get:

Cylinder 1 CR = 10.92:1
Cylinder 4 CR = 11.30:1

These are with JE 9.5 CR pistons on standard mahle cylinders for a N/A engine and a DR-20 (Camgrinder's GE20.)

Please tell me I'm way off. I'd rather be mathematically challenged than be forced into twin-plugging.

john
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1978 911 3.0 Lichtbau toy "Gretchen"
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Last edited by JohnJL; 10-22-2005 at 10:43 PM..
Old 10-22-2005, 08:35 PM
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