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Dynamic compression as guide to static compression increase with bigger cam

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  • jaybnve
    replied
    It's 114, with the ICL degreed at 110.

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  • TC
    replied
    Originally posted by jaybnve View Post
    FWIW, my 585" SOHC runs 13:1 static and behaves beautifully on the street on 92 octane pump gas. 6K stall converter and a big cam, something like 304 seat to seat. DCR worked out to be 8.5:1.
    What's the LSA, figuring it's pretty wide..........

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  • jaybnve
    replied
    FWIW, my 585" SOHC runs 13:1 static and behaves beautifully on the street on 92 octane pump gas. 6K stall converter and a big cam, something like 304 seat to seat. DCR worked out to be 8.5:1.

    Leave a comment:


  • JeffMcKC
    replied
    With a high stall converter it will be hard to lug it also. You would be very Surprised at what you can run. If you drive where its muddy and wing it up on Good fuel at the track when you play with Valve events

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  • CDMBill
    replied
    Originally posted by Caveman Tony View Post
    Errr... no, its not over simplified.

    The cam controls the sunroof, right?
    Actually on mine the cam controls the convertable top.

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  • CDMBill
    replied
    We (Dougan's and me) ran this by the Comp Cam guy, and by the JE piston guy and ended up going with the 11.5:1 on the order sheet. I have another car buddy who ran 11.6 with a similar combustion chamber and a smaller cam so I have some reason feel that we are safe, but not by much.

    As to RPM the plan is to have about a 500-600 RPM higher operating range for the 'refresh' based on the longer duration and slight increase in .200 duration/lift specs. At the other end the increase in compression is also intended to help offset the loss of torque we expect at rpm ranges below the stall speed of the new converter. Drivability you know.

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  • JeffMcKC
    replied
    LOL your on the track Bill, in fact your way ahead, its a balance, but dont get carried away because you will be changing the RPM it all comes in at too.

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  • A/Fuel
    replied
    Originally posted by Caveman Tony View Post
    Errr... no, its not over simplified.

    The cam controls the sunroof, right?
    Ahh, yes, the cam controls dynamic compression....I've spent a long time dealing with compression. Static is just a number, usually to compensate for cam profile.
    I deal in nitro engines, but numbers are numbers, until you add fuel!

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  • Caveman Tony
    replied
    Errr... no, its not over simplified.

    The cam controls the sunroof, right?

    Leave a comment:


  • Dynamic compression as guide to static compression increase with bigger cam

    With the same combustion chamber and similar bore and stroke, can a known pump gas friendly combination be extrapolated to allow more compression with a larger, later closing cam? I ran a number of calculations using the Wallace Racing calculator and found that the dynamic compression ratio stayed the same with the new bigger cam by raising static compression from 11:1 to 11.5:1.

    Is this over simplified?
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