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Unread 09-06-2013, 07:37 PM   #16
bigbossd1030
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Quote:
Originally Posted by iLuvJeepYJ

What do you mean bypass?
I assume he means the nutter bypass?

Sent from my iPhone, probably because I am bored at work.

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Unread 09-07-2013, 11:21 AM   #17
blown50
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4.7 stroker! 100 mph with 3.07 gears! Then I got SKEERED My 4.2 was a dog too, that's why I built the stroker
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Unread 09-07-2013, 01:28 PM   #18
rambo3489
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.... I don't think I'll ever hit 60 off road. Let alone 70
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Unread 09-08-2013, 10:46 PM   #19
CyndiB
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I have the same set up as you only on a 90. I rarely use 5th gear, that makes a big difference. Also, with the 33s, your speedometer is going to be about 10mph off, when it says 60, you're probably doing about 70. I just put a can of Seafoam in the gas, that made a huge difference, I can actually get out of the slow lane now.
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Unread 09-09-2013, 11:13 AM   #20
zeus87gn
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Quote:
Originally Posted by iLuvJeepYJ
What do you mean bypass?
Quote:
Originally Posted by bigbossd1030
I assume he means the nutter bypass?
Correct - the Nutter bypass must be done to make your vehicle run correctly with the MC carb but there's more to it than 2 wires
The dist must be corrected to have the mechanical advance it needs because the computer is taken out of the system and no longer in control of the timing
The stock dist only had about 7deg of advance, the computer handled the rest
The dist needs 15 to 17deg of mechanical advance
The vacuum advance needs to be hooked to the intake manifold then dialed in
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Unread 09-10-2013, 01:50 PM   #21
iLuvJeepYJ
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Quote:
Originally Posted by zeus87gn

Correct - the Nutter bypass must be done to make your vehicle run correctly with the MC carb but there's more to it than 2 wires
The dist must be corrected to have the mechanical advance it needs because the computer is taken out of the system and no longer in control of the timing
The stock dist only had about 7deg of advance, the computer handled the rest
The dist needs 15 to 17deg of mechanical advance
The vacuum advance needs to be hooked to the intake manifold then dialed in
So I need to set the timing between 15-17?
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Unread 09-10-2013, 02:21 PM   #22
bluedaffy
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There are are weights in the distributor that dictate the limit on how much mechanical advance the distributor can provide. I believe (someone correct me if I'm wrong here) that pre-smog distributors could go up to 18* mechanical advance and the computer controlled distributors only went up to 7*. I may be off on the exact numbers here, but the point is, the pre-smog distributor is the one you need because the computer will no longer be able to make up the difference. The numbers are visible by taking the cap off the distributor and turning it while looking through little holes in the top to see the weights. The numbers are printed on the weights. Do another search for pre-smog distributors and you'll probably find a better write up relating to what I'm trying to explain.

FYI- I bought a new cardone distributor when I did the nutter bypass and the numbers WERE NOT PRINTED on the plates. This was incredibly frustrating because I had to take the brand new distributor apart just to make sure the weights were for a pre-smog engine and not the newer computer controlled version. Here's a link to my old thread when this happened to me. http://www.jeepforum.com/forum/f12/d...ights-1398642/
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Unread 09-10-2013, 03:38 PM   #23
zeus87gn
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Daffy is correct on his degrees of mechanical advance - look at the pic in his thread of the weights with no stampings on it
You need weights in your dist with anywhere between 16 and 18 deg of advance capability
Most likely (unless its been changes recently), you have wieghts that only allow 6 or 7 deg of advance capability

No, do not set your timing at 15 deg - set it between 8 and 10 - I run at 9, but I'm close to sea level
The vacuum advance connects to manifold vacuum to pull the timing up where it needs to be for idle situations
As the carb opens up, the manifold vacuum drops, the advacne backs off and the mechanical advance pulls in - that's where the power comes from - it's a balancing act
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Unread 09-10-2013, 03:51 PM   #24
dancytron
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I have no doubt that having the presmog distributor will make it perform better and more economically.

However, fwiw, if you can't get above 60 mph, something else is wrong too. Mine is just nuttered with stock carburetor, team rush with original coil, spark gap at .045, manifold vacuum on the dist. vacuum advance, 30 inch tires and the original distributor set at 8 degrees. It accelerates to 3500 rpm and will go 85 mph in the flats without any real trouble. 14 mpg around town, 18 on highway driving for best mileage.

If I was going to spend anything on it or do any more improvement work, presmog distributor and new better coil would be it, but I'm not in that mode right now.
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