degreeing a summit 8600 cam

FullSizeJeeper

I need to degree my Summit 8600 cam for my 360. Talked to Summit today, intake should open TDC, close 34* ATDC exhaust open 49* BBDC, close 5 BTDC. Does any one have a copy of an actual cam card they could scan and e-mail or fax to me? I've got to research some old posts here to figure out the whole process, but having a cam card seems like the first place to start.

bulletbuilder

Full Size I've looked thru my cam cards and can't seem to find that particular one. The events Summit gave you are 'seat to seat' figures. .050" tappet lift numbers are easier to use when degreeing a cam. Watching the dial indicator gives you 'warning' when you approach that .050" figure. (opening or closing). You can also use the Intake Centerline method. I just opened the Elgin book, (same cam grind) and it says 107 degrees for intake centerline. If no one can come up with .050" figures, try the intake centerline method. Good Luck, Larry

AMX69PHATTY

A pair of adjustable pushrods and solid lifters should be used when degreeing a cam right ? It's corny, but I didn't even buy a degree wheel, just cut a 16" or so diameter circle out of a cereal box, marked cam events on it, and measured with a protractor 111!!! yeah I know, "corny" aint it ? It was a big Corn Flakes box :?: If it's done with hydraulic lifters they'll collapse and give inaccurate reading won't they ? I had to use adjustable pushrods cause the Solid lifters, Mopar, were about .250 "shorter" than the hydraulics and had to make up for the difference. The Mopar solid lifter I used was part #P2843177. AMC lifters are the same as those used in Chrysler Hemi's right, a larger diameter compared to SBC and Phords ?

bulletbuilder

Lifters are the same diameter at .904". I generally degree cams before I install the heads. I use the Powerhouse? dial indicator that slides into the lifter bores and is O'Ringed to make it stay where you put it. With the heads on, I have hydraulic lifters that I diassembled, machined a piece of bar stock to fit the I.D. of the empty lifters. Then using a 1/4" plate, bolted to the valve cover bolt threads (intake side), I set up a 2" travel dial indicator, with magnetic base, where the indicator plunger rides on top of the bar stock (that I had press fitted into the empty lifter). Making dead sure that my indicator plunger is parallel to the lifter centerline. Then I find exact TDC with a special spark plug stop (screws into the plug threads), by rotating crank CCW till it stops, make a pencil mark on the degree wheel. Turn CW till stops, make another pencil mark on the degree wheel. Exactly halfway between these two marks is TDC. Bend or adjust your cam degreeing pointer to reflect TDC. Follow normal proceedures to find the opening and closing events after that. Larry

82Waggy

Camshaft SM-8600 Rocker Ratio, Intake 1.6 Rocker Ratio, Exhaust 1.6 ILCL (Crank Degrees) 107 ELCL 117 LSA 112 Int. Duration @ .006 272 Exh. Duration @ .006 282 Int. Duration @ .050 214 Exh. Duration @ .050 224 Intake Lobe Lift 295 Exhaust Lobe Lift 310 Intake Valve Lift 472 Exhaust Valve Lift 496 Tappet Lift.006",.050" Intake Open, ATDC -29,0 Intake Close, ABDC 63,34 Exhaust Open, BBDC78,49 Exhaust Close, BTDC-24,5 Overlap53,-5 Hydraulic Intensity 58 Recommended RPM's1500-4500

FullSizeJeeper

82waggy, thanks that is what i needed. I've got as friend thats lending me his degreeing kit, family going out of town for a couple of days, going to tear into it Wednesday or Thursday and line this puppy up. Got this in my 82 Cherokee Chief/Limited. Its an 82 Limited Cherokee with all the accessories from my original 76 Cherokee Chief (plus plenty of extras from a 79 an 74 waggy). This engine is out of a 74 waggy I parted out many years ago. Only had 50,000 miles on odometer. The fuel pump arm tip broke off (just sitting there in the front cover for 15 years). Once I get this cam lined up proper, this thing is going to scare people! Thanks for all the input! :t: