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Unread 12-09-2014, 09:26 AM   #1
scottyDive
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1984 CJ7 
 
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Location: Killingworth, Connecticut
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CJ 7 - Ignition and Carb upgrades

New to me 84 and am going through it part by part in the engine compartment. This will be a basic driver with occasional off road use. Nothing extreme - mostly beach access.

My thinking is why rebuild the carb if I should be upgrading. Same goes for the coil, cap, plugs, and wires if I should be considering HEI. I am not interested in TBI as its just not worth it for us with what we want to do with the jeep.

So would like to hear from members of what they recommend.

Here is what I have for a Carb:


And Dizzy/coil:


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Unread 12-09-2014, 09:49 AM   #2
Matt1981CJ7
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Some guys will recommend you rebuild the BBD, instead of replace it. But, if yours is as worn out as mine got, you'll be happier with a new carb.

If your Duraspark ignition is working well, then you won't realize any improvement switching to an HEI. An HEI will clean up your wiring, however. Look into the "Team Rush" upgrade for a cheap and effective mod to your Duraspark.

A couple of comments based on what I see in your pics....You really should get your PCV system hooked up. That open hole on the back of your valve cover is allowing dirty air to get sucked into your crank case. Also, your carb has the fuel bowl vents capped off. Those normally connect to a charcoal canister. Without proper venting, the carb will display hard hot starts. I also don't care much for those hoses draped over the valve cover. That's a failure waiting to happen.

Hope this helps,

Matt
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Unread 12-10-2014, 11:45 AM   #3
scottyDive
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Thanks for that information on the Dura spark. I read all about it and I will definitely do that upgrade. As for the comments on the carburetor and the PCV, I removed because they were just were crumbling. I did order the FSM so that I can hook up the carb correctly and see how it runs after that. I really appreciate the comments I want to make sure this is running correctly.
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Unread 12-10-2014, 11:48 AM   #4
swatson454
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Just be aware that the "Team Rush" is nothing more than common tune-up, replacement parts that don't address the lazy advance curve, the weak module or the weak coil.


Shawn
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Unread 12-10-2014, 05:54 PM   #5
Partsmke
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I don't really understand your position on TBI compared to what you have. The Carter BBD you have along with the emissions system that has been removed never ran well. If you insist on the BBD get one that was used prior to 1982. The Motorcraft 2100 two barrel can be adapted and jetted, they work about as well as a carburetor can.
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Unread 12-10-2014, 06:10 PM   #6
GPER
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Quote:
Originally Posted by swatson454 View Post
Just be aware that the "Team Rush" is nothing more than common tune-up, replacement parts that don't address the lazy advance curve, the weak module or the weak coil.


Shawn
If you go all the way with the Team Rush upgrade thew cdi replaces the module and the e core coil is a big improvement.
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Unread 12-10-2014, 06:34 PM   #7
uptillnow
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Quote:
Originally Posted by GPER View Post
If you go all the way with the Team Rush upgrade thew cdi replaces the module and the e core coil is a big improvement.
I used the GM 4 pin module and wired it into the Duraspark case.

This worked very well for me, I went 2 1/2 years without going through a box.

Then, I just had to wire up a Capacitive Discharge Ignition system (CDI). I am amazed beyond belief how much better this UPGRADE is.

I paid $210.00 for the CDI and coil. Again, WOW!!

UPTILLNOW
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Unread 12-10-2014, 07:17 PM   #8
JeepHammer
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Consider me in the groove with what the guys are telling you.

'84 had emissions computer,
By the time you spend getting the carb torn down, setting stepper pins and taking ignition timing away from the computer,
The find out the carb is worn out enough it still won't adjust/tune but at 'Working' (not working good) its not worth the time/effort under the hood.

Bypassing the computer so the ignition module gets direct controll of timing,
Just run distributor Orange & Violet wires to the module directly.

The biggest upgrade you can do for the ignition is cap adapter, cap, rotor & some reasonable plug wires.
'TeamRush' upgrade, the basic version gets all that done.
Just use quality parts and its all drop on place of what you have now.

'John Strink Stealth HEI Upgrade' shows you how to gut the factory module,
Install a $25 HEI style module in the case,
And that will set you up for a better ignition coil (E-core).
No more random module failures, and capacity for a better coil for $25 is a pretty good deal!

Doesn't matter which carb or ignition you settle on,
You will have to do a little tuning since you removed the computer,
You will have to do basic tuning on the BBD,
And no matter if you go HEI clone or keep the factory distributor,
There will be some tuning involved.

Get comfortable with a vacuum gauge and timing light and you can make it run reliably, and usually better than the factory settings.
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Unread 12-10-2014, 07:34 PM   #9
RedNeckCorvette
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I agree with Matt look into the team rush up grade and as swatson454 & GPER indicates, should you want to take it a step further you can find plenty of additional options that will help along the way.

In my opinion, Matt has it down to the least you will spend for the best advantage, given your application of use.
Personally after the tune up I would address the timing [it is part of the team rush I am sure] before adjusting the carburetor. Then blow the carbon off that carburetor and adjust it according to manual. It has probably never been done since new and this will give you a better Idea weather it needs to be replaced. On an engine that has been running as rich as that one is, myself [should there still be a slight miss when done with every thing else] I would get it hot pull off the air cleaner and spray water down the intake wile running about half speed and gun it rather than stall.
It sounds Crazy but it has helped me several times cleaning up a miss here and there that involved carbon build up and so far [about thirty or forty years of doing so] I have never damaged an engine.
RN
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Unread 12-10-2014, 07:38 PM   #10
Matt1981CJ7
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Quote:
Originally Posted by RedNeckCorvette View Post
I agree with Matt look into the team rush up grade and as swatson454 & GPER indicates, should you want to take it a step further you can find plenty of additional options that will help along the way.

In my opinion, Matt has it down to the least you will spend for the best advantage, given your application of use.
Personally after the tune up I would address the timing [it is part of the team rush I am sure] before adjusting the carburetor. Then blow the carbon off that carburetor and adjust it according to manual. It has probably never been done since new and this will give you a better Idea weather it needs to be replaced. On an engine that has been running as rich as that one is, myself [should there still be a slight miss when done with every thing else] I would get it hot pull off the air cleaner and spray water down the intake wile running about half speed and gun it rather than stall.
It sounds Crazy but it has helped me several times cleaning up a miss here and there that involved carbon build up and so far [about thirty or forty years of doing so] I have never damaged an engine.
RN
Also known as a "Mexican tune-up".

Sorry if that's not politically correct. But, since the technique is effective, it's not really derogatory.

Matt
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Unread 12-10-2014, 07:51 PM   #11
RedNeckCorvette
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Ok
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Unread 12-10-2014, 08:20 PM   #12
Rolandt03
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I am very pleased with my weber 38 carb, nutter bypass, and team rush upgrade!
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