CAM ???

[Anonymous]

Thanks David for the suggestion, but I think that the 9.7:1 C/R is to high for my intented use. I suppose with 9.7:1 to have to use octane booster.
My goal is a increase in power(mild) with an adequate driveability for street(C4/automatic) use with pump gasoline without booster.

I don't understand the 10.5:1 C/R : : : How did you come up with :
I think,badly expressed myself but this is my calculation :

Number Of Cylinders: 6
Bore Diameter [in]: 3.70 (3.68 + overbore.020)
Stroke Length [in]: 3.91
Combustion Chamber Volume [cc]: 52cc (64cc - mill to .060)
Head Gasket Compressed Thickness [in]: .050
Head Gasket Bore Diameter [in]: 3.81
Piston To Deck Clearance [in]: .085 (.125-.040)
Select Piston Type/Size - Dished: 6.5cc
Results: 9.3:1 C/R

If my calculation is OK it is an acceptable or good combo with
FSP ARC-268/274 or FSP 264-110

Thanks again,
Wally

 

[CZLN6]

Howdy back All:

Wally and Mike- Your calculations are correct. I got my apples and oranges mixed up and ran the deck height at zero.

Given your dimensions Wally I got 9.3:1 this morning. The combo will work just fine. However, I must repeat that attaining a zero deck height and a tight quench is a worthy goal for any engine with a combustion chamber cylinder head design.

I'd be inclined to go with the ARC 268/274 cam.

Adios, David

 

[Anonymous]

Thank you for the lot of info, my plan is concretized

I have a last interrogation : what do you think about the HSC 2.3 pistons :
Have you already to use :

WALLY

 

[falcon60]

Quote from David: "Given your dimensions Wally I got 9.3:1 this morning. The combo will work just fine. However, I must repeat that attaining a zero deck height and a tight quench is a worthy goal for any engine with a combustion chamber cylinder head design."

I can't stress the importance of this enough. If you can use the 2.3 pistons and attain zero deck height (or even .005-.010" above the block) and then mill a dish in the piston top to get the compression ratio you need,it will be a great combination that will run better than any other piston/deck height setup. It will allow you to use a compression ratio at least .5 higher than normal without detonation as well.
My thoughts on the cam selection: if it's a mild build with nice driveability I would suggest the 112 lobe separation grind. The idle with a C4 will be a bit nicer and it will still make very good power.

Terry