I want to start a dialogue on camshafts, how they function and what effects or results the many specifications have.
First of all I have an 2122 Edelbrock cam for my 66 289 coming out of the engine is what I assume to be a stock 2V cam.
I'm asking what effect will the valve overlap have on my compression ratio and compression pressure, how to determine or calculate? The compression pressure was 165 PSI I would like to back calc. the old ration as well to compare.
FYI the stock overlap I calculated at 36 deg,
the new 2122 cam calculated at 51 deg and
Specs from a "K" 271 HP calculated out at 82 deg
The formula used was
add intake and exhast advertised durations and divide result by four
subtract the LSA (lobe separation angle) and
multiply the result by two
So this particular exercise is to also help me determine if my compression will be low enough to enable me to bolt on a blower.
fire away...
First of all I have an 2122 Edelbrock cam for my 66 289 coming out of the engine is what I assume to be a stock 2V cam.
I'm asking what effect will the valve overlap have on my compression ratio and compression pressure, how to determine or calculate? The compression pressure was 165 PSI I would like to back calc. the old ration as well to compare.
FYI the stock overlap I calculated at 36 deg,
the new 2122 cam calculated at 51 deg and
Specs from a "K" 271 HP calculated out at 82 deg
The formula used was
add intake and exhast advertised durations and divide result by four
subtract the LSA (lobe separation angle) and
multiply the result by two
So this particular exercise is to also help me determine if my compression will be low enough to enable me to bolt on a blower.
fire away...