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post #1 of (permalink) Old 09-04-2000, 06:22 PM
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HEI in a 87YJ?

Will a HEI ingition work in the 87YJ. What else needs to be done. What about the computer, will it still work?


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post #2 of (permalink) Old 09-04-2000, 07:45 PM
 
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Re: HEI in a 87YJ?

I put an HEI in my '89 YJ with the 258. Going with the Ford TFI upgrade would be cheaper, easier, and more reliable...but I didn't know about it back then and I think the HEI is much better for running underwater.

You need to get a HEI distributor from a Chevy 250 I-6 engine. I got mine out of a '78 Nova. Replace the driven gear on the bottom with a driven gear from an AMC V-8 (304, 360, etc...) and replace the standard parts like cap, rotor, coil, wires, weights, etc. You may also want to chip in for an adjustable vacuum advance for more tune-ability. Installing it is like installing any other distributor, here is instructions on what to do: http://www.geocities.com/sycho15_2000/ignition_woes.htm. The only wire you will need to hook back up is the black one.

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post #3 of (permalink) Old 09-04-2000, 09:10 PM
 
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Re: HEI in a 87YJ?

First of all, I'm assuming you have the AMC 258 I-6 engine....?...
You gave no details, and you didn't fill out your bio, so there is no way for us to tell what engine you have, and there is a HUGE difference between the I-6 and V-8 conversions or upgrades...
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Actually, to do the GM HEI CONVERSION (conversion, not upgrade...) correctly, you will have to install a power relay, or you are wasting time and money.
The GM HEI is a power hog, and you are severely limiting the potential of the GM HEI if you don't supply it with a 10 Ga. wire supply, and no ignition wire in your stock ignition system is 10 Ga., so you will have to wire from scratch, or install a relay.
Done correctly, it's far from a "One Wire Install"....

The Ford upgrade is more powerful, more reliable, and more water tight if done correctly, and it's a lot easier and cheaper to do that the GM HEI conversion, and it won't interfere with your 'computer' or on board emissions systems.
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If you decide to go with the GM HEI, get one from about a '76 Chevy I-6 pickup that has the remote coil, so you get the ignition coil out of the cap.
(Yes, there is such an animal, and it uses a properly designed E-core coil)

Use a premium cap and rotor with brass terminals, and reasonable plug wires...
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If you want the alternative to the GM HEI, let me know and I'll re post the upgrade article again for your stock ignition. I will need to know if you have a V-8 or I-6.


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