i'm tryin to figure out my dynamic compression,and it asks for intake valve closing point abdc plus 15 degrees..can someone checkout my cam card link and tell me if i am doing it right???is it the 66 plus 15???any help would be appreciated...
mike


http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=08-503-8

looks right to me. I don't know what calculator you're using, I don;t remember the +15* thing.

You need to use an Eff./Dynamic CR calculator that uses advertising timing numbers not .050" lift plus 15 numbers!!

Try Pat Kelley's http://cochise.uia.net/pkelley2/DynamicCR.html

or this one (Boost calculator).

http://www.rbracing-rsr.com/comprAdvHD.htm

AND I strongly recommend going over to Pat's site first and READING it at least THREE times to get all this straight, then have at it.

I did!!

pdq67

its the calculator on the keith black piston web site...thanks for your help...i wasn't sure if its right or not though...

will do pdq...i assume all the info i need is on my cam card,correct???

For DCR calculators, you just need the intake valve closing number and your rod length. And of course, your motors bore and stroke motor.

The boost calculator also inputs your local elevation off sea level which I input as about 700 feet where I am at and a zero boost, (if naturally aspirated, i.e, unblown), is .0001 pounds.

You also need your head cc and gasket thickness that makes a decent quench from generally .035" to .045" or so to find your motor's static compression ratio. You need a down-in-the hole, piston dimension of about a stock, .025". Plus, again B&S... Oh, almost forgot, a + cc for piston dome or - cc valve notch or dish amount has to be figured in too...

I use the ROSS Racing Pistons site's static compression ratio calculator to find my static compression ratio for this.

Have at it.

pdq67

thanks pdq i appreciate it....
mike