Project: "Rigor Mortis"

[Pookapotamus]

[Pookapotamus]

[Pookapotamus]

Ok back together, and got the degree wheel out.

First off, the cam card says my lobe separation is 113 deg, and my centerline is 110, therefore the cam has a natural advance of 3 deg.

and @ .050 of lift on the intake I should have a reading of 13 deg on the degree wheel. so.....

with the mopar chain set at factory I get a reading of 17.5 deg therefore Mort is 1.5 deg retarded. 17.5 - 13 - 3 = 1.5 retarded

with the Mopar chain set at adv I get a reading of 13.5 deg therefore Mort is 2.5 deg advanced. 13.5 - 13 - 3 = 2.5 advanced

what I am planing on doing in the morning is drilling the cam sprocket and adding a 2 degree adv spacer. theoretically giving me an advance of 4.5.

How does my math look to everyone? does this make sense??

[4.3LXJ]

I think it does. 4.5° is quite a bit

[Pookapotamus]

Well if the cam was designed to be run at 3 a bit extra should not hurt!

[4.3LXJ]

No. I did a little reading and I guess 4-6° is what you advance for a change of 500 rpm in the torque curve

[Pookapotamus]

Then that's what I will shoot for! Thanks Steve!

I'm going to run through the whole setup again and double check everything!!

[bRIBEGuy]

Timing math is hard.

[Pookapotamus]

Tell Me about it!!!! I am more confused than ever!!!!


After removing 4 pistons so that everything spins extremely smooth then re-finding TDC I get numbers that seem out the window!!!

This run of numbers with the chain at zero says that Mort was running 23° retarded. The cam card says I should have .050" lift on the intake lobe at 13° BTDC, @ .050" lift I get a reading of 10° ATDC.

With the chain set for adv, @ .050" lift I get 5° ATDC.

so this it telling me that I am reading the wheel right, adv is working, everything is in the proper direction. But Mort was seriously retarded.

Can I really be that far retarded? there are a lot of factors that could add up to this, like the 4.2L crank in a 4.0L.

I am going back out to my kitchen to measure everything again from scratch!

[4.3LXJ]

Yup, a conundrum

[Pookapotamus]

Redid everything, took the timing chain off, messed everything up, then started from scratch.

I sill get 23 deg retarded

[4.3LXJ]

That could be. Are you using the 4.2 timing gears too?

[Pookapotamus]

Ok so 1 tooth out and 4 degree bushing sets it at 14 deg, I guess I'm happy with that, I will reassemble and see if it turns over without hitting a valve.

[Pookapotamus]

You can see that the timing marks are off.

[4.3LXJ]

Well, as long as it works, so be it. You are going to have a torque monster