I need the ABDC specs @.050" lift for the COMP EX284 SBC cam. Do any of you have this information on your cam card?

The Comp Website only lists the valve timing specs @.006"---but I need them at .050" lift.

If not, does anyone know how to convert a .006" ABDC spec to a .050" spec?

---Thanks, Glen

Anyone?

You should be able to pull up CC's e-cat. and go the the back of it under the cam section and cross reference the lobes used to find the duration at .050" on all their cams..

pdq67

Comp doesn't list .050 timing numbers on their cam cards, but if you have access to ea3.0 or dd2000 (or even Pat Kellys DCR program), you can run the numbers thru and get really close if not right on.

.050" numbers with the cam set as ground - ILC = 106° ATDC:

intake open - 14° BTDC
intake close - 46° ABDC

exhaust opens - 57° BBDC
exhaust closes - 9° ATDC

I'm sorry, I should have said that after you find the duration at .050" numbers that you needed to input them into a cam program like D2K has to come up with the supposed actual timing numbers..

I just automatically do it this way so missed that ALL important step..

pdq67

Thanks guys I really appreciated it. I'm using the info to calculate my dynamic effective compression ratio with different piston selections on a stout roller 350 I'm building. --Thanks, Glen

For dynamic compression calculations you should use seat to seat timing.

Novakind,

Thanks I'll check into it. Here is the calculator I'm using.

http://www.kb-silvolite.com/calc.php?action=comp

Novakind,

The calculator (link above) asks for the ABDC @ .050" + 15 degrees.

--Glen