Jeep 4.0 or more accurately a 4.6 STROKED 4.0 with Jeep injection hardware???

[EagleMark]

Really? The chevy I-6 distributor drops in place with just a drive gear swap? Do you have any links or other info about this? I have never heard of that.

I had a write up on how to do it on another forum but like all my technical posts there it was either removed or reposted under another name... but here is an example:
http://www.4x4wire.com/jeep/tech/electrical/hei02/

[doc65]

It absolutely does, I have one in my brown Eagle, mine is actually an Ebay purchase from SkipWhite and is a new unit with the right gear already on it, it dropped right in place. I went that route because I liked the cleanliness of the 1 wire distributor, plus it has a high output, and I think shipped it was under $60 I couldn't find a wrecking yard one anyway, but if I had it would have cost me hta much once I put a cap & rotor on it...

Mine is actually a little cleaner looking than that one, but no pics avail right now. I used Jeep 4.0 wires and the lengths worked out pretty well, a couple might be just a tad short, but overall good, gotta go taht way as with the HEI it takes Female-Female wires where the AMC originals are Male-Female

[EagleMark]

But the real point is that year six cylinder above came already for EFI too! Not just an HEI with mechanical and vacuum advance.

[doc65]

Mark,

You are of course right, yes they did make a small cap hei no adv. distributor, I've read that it was 86 only, though I've not verified it yet.

[Six_Shooter]

Easiest way to swap, is to use a dizzy, and get it running that way on $8D/S_AUJP.

The ECM is not what would need to be reprogrammed to read the Jeep crank trigger, but the DIS ICM, since it deciphers the crank trigger signal and filters it for what the ECM needs to see.
You can actually have spark with a GM ignition system, without an ECM even in the car. It will just be base timing.

[JeepsAndGuns]

Kinda what I figured.
Even though theres not much point, heres basicly what the service manual says about the crank trigger for the 4.0. Just for informational purposes.

On the 4.0, there are 3 sets of 4 notches. So there are 3 sets of 4 pulses for each crank revaloution. The trailing edge of the 4th notch witch causes the pulse is 4 degrees below TDC of the corresponding cylinder.


So it appears the notches are timed to a pair of cylinders (since two come to TDC at one time, one on compression, one on exhaust) and it then uses the cam sensor to determine witch stroke they are on.

Now something interesting, the 4.0 harmonic balancer has a nice thick lip on it that would lend itself good to making it into a trigger wheel. And if you look at the mopar MPFI system they sell for the older 258's. Its basicly a stock 4.0 system with a harmonic balancer notched for the crank trigger, plus a trigger that bolts to the front of the engine! The balancer is sold seperately from the kit, but required..lol. But in the picture here, you can see the mount just above the O2 and fuel filter in the lower right of the picture. It bolts to the timing chain cover. http://www.summitracing.com/parts/DCC-5249610AE

So if we wanted to do DIS, we could simply machine the proper notches into the front pully/harmonic balancer and mabey even use the mopar crank trigger mount.

[Six_Shooter]

Don't use the outside of a harmonic balancer for timing control. The outer ring will actually shift at different speeds than the crank itself, hence absorbing harmonics.

This can cause timing control issues, and possible drivability issues.

Make a separate wheel that is sandwiched between balancer and pulley, or attached to the outside of the pulley.