Has anyone looked into using the Jeep fuel injection system? Why not build a /6 to match the jeep motor and put the Jeep system on it? I havent checked to see if firing order and if bore and stroke etc. can be matched has anyone else? I see that Clifford has offered a 4.0 slant six engine so displacement can be matched. It just seemed easier to build a engine to suit rather than change the EFI system and the Jeep engines seem to have plenty of power for what I need. Please comment if you now this is not practical.

It should work fine, engine size does not matter, but that is alot of wiring, and you have to put on all the sensors etc. Might be a easier to just put 258 in dart. You would need the tank pump, and I am not sure if gas injector manifold would align with slant/Clifford. It is a good idea, but you will need a very sharp electrical guy, and a jeep to strip..

Probably cheaper to buy a Holley, or Simple Systems FI. The SS one looked good to me, comes for sixes lots less hassle than any jeep thing, about 1000$

I would like a system to run as well as the Jeeps do and not have to mess with all the tuning I read about in this forum. The Jeep system does have quite a bit of aftermarket help in the way of retro fit kits for the older CJ's. Price may be a concern since you would still need a manifold made up and rail, also engine position sensor could be a problem. Old Cherokees should be cheap enough though for the donor parts. I have not heard of the Simple Systems FI I will check that out thanks.

I retrofitted EFI from an '89 Cherokee to an '88 Wrangler. There is alot of wiring to deal with. I spent 2 weeks of spare time (between the day job and family obligations) getting it all sorted out. I will say, though, that for normal cruise operation the O2 sensor will compensate quite a bit for the difference in displacement and quirks. You will still need a custom fuel rail to properly locate the injectors, and a custom adaptor (probably complete custom intake or modified stocker) to mount the throttle body. The electronics in the distributor (as I recall) were hall effect, which needs dealt with. There is the intake pump and return line. The early 4.0 system like I used is about as basic as you're going to get from an OEM doner, but the wiring harness goes out through a hole in the radiator support, across the front, and back in through the radiator support again. That proved more trouble than you'd think.

Mike
mpgmike@PowreHaus.com

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Recognized by US Federal Courts as a Fuel Economy Expert!

It depends on which year Jeep you take the system out of. Jeep EFI has one complication that GM doesn't. A GM batch fire system uses a trigger virtually identical to a Mopar Lean Burn distributor. Most Jeep EFI systems use a crank trigger combined with a single 180-degree tooth in the distributor and a Hall effect sensor. You'd have to adapt both of these triggers to the slant six to make this work.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

Oh yea, forgot about the crank sensor mounted in the bell housing. Fortunately the '88 Wrangler tranny already had provisions for that.

Mike

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Recognized by US Federal Courts as a Fuel Economy Expert!

Hi, I meant to say "Simple Digital Systems" I saw one on a small block chev that came in like third in one lap of america race..looked really good. talked to the SDS guy via email(he tries to answer in one day) about putting it on a 480" hemi I had in a cuda back then. Dual quads on a hemi can run, but not with ease, and gas use was an issue. FI seemed to be a good answer, can the quads.

SDS is not an emissins deal, it uses O2 sensor to set up mixture, then you can adjust it % yourself, rich if you want to etc. Also will fire coil(S) , no distributor, if you want that, including custom advance program that will retard at high RPM if you want . Does not need a PC to make it work..really is simple.Smart guy...has all the stuff, pumps etc

He said to use single 4500 Holley as TB air valve, recommended some accell high flow injectors you can tap into hemi manifold,Problems over,. I sold car instaed..(mistake)

Check out website... I have nothing to do with him, but I was impressed with what he had done,,and that chev..zero problems with whole one lap thing.

""

I checked out the website allready seems to be a good system I like the simplicity. Thanks for the info.

I think the hall effect distributor would be more of a problem than the crank sensor. There is a company that makes kits for the crank sensor to move to the dampener on a Jeep maybe that could be machined to fit a slant motor and they also have prefabed wire harnes for the single 60 pin ecm on the earlier 4.0's to make wiring easy but cost is about 400+
http://jeepers.biz/ for Hesco parts
As I said there is some aftermarket help but it is geared toward Jeep owners and of course cost is a concern as always but the reliability seems very apealing to me.

Went to the junkyard yesterday and found that the TB 3.9 v6 has a hall effect pickup distributor and it is the same basic housing as the slant motors. It is a three wire pickup and looks to be similar to the Jeep motors. This will make things a lot easyier.
I think I will start looking for a donor, should be easy here in MI, lots of rusty high mileage Jeeps running around.

The 3.9 V-6 is an "Odd" fire engine, the slant is an "Even" fire engine. Also the distributer housing is the same as a small block V-8, not a slant.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I was thinking of using some of the parts from the 3.9 distributor in a slant it seems to me that I have taken parts from a slant distributor such as the pickup and used them in a v8 distributor. The inner diameter of the slant housing looks to be the same as a v8. In any case the Hall Effect pickup and trigger dont look to be so complicated that I couldnt custom fab something and get it phased correctly. Now Im starting to wonder about the crank sensor, any ideas?

Your trying to avoid tuning when even if you got a Jeep ECM/System or a Dodge system to work on the Slant the possibility of having to pull off something to help it be tuned is still there.

Tuning is not that hard and with a MegaSquirt or a SDS your car will be a lot better off in the long run and maybe even be cheaper to do it than retro fitting a salvage yard setup that you might end up having to put a extreme amount of work into to get it working/running correctly. The MS system has a lot of backing and internet help that can get you up and running. Heck it can even make the base maps for you.

Also a little weighting til spring time & there may just be some complete setups designed for the slant coming down the pike that I know of. There is just a matter of a few things like a CNC machine and other equipment that is being delivered in two months to help get things rolling so that custom pieces can be made in house instead of relying on others.




Jess

Your absolutely right Jess, I guess I was thinking that the Jeep system might be easy to fit on a slant but if it were then It would be done allready. I think I will wait till spring since my slant runs soooo good now with its super six carb setup and electronic ignition, also will keep reading up on the SDS system. Hey, I was curiouse and everyone is a great help this is one of my favorite topics also I cant stand to think of putting GM fuel inj. stuff on my Mopar. Thanks again.

Is this a Hall effect pickup with six equally spaced teeth, or is it one of those one-tooth pickups? I'm not sure which year 3.9 that is, but many Magnum motors use a combination of a single tooth trigger in the distributor and a toothed wheel on the crankshaft.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

The 3.9 V-6 is a hall effect pickup, with a "shutter" wheel. The "windows are UNequally spaced, due to the v-6 being an odd fire engine.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225