Manifold vacuum - Page 2 -

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post #16 of 18 Old 09-07-2013, 03:02 PM Thread Starter
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1986 CJ7 
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Oh also I got some carb/throttle body cleaner and sprayed it around the carb base plate as well as intake manifold, didn't notice any changes.. Also sprayed around the vac lines. If there is a leak I didn't find it

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post #17 of 18 Old 09-07-2013, 03:31 PM Thread Starter
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Jets are .098 and .095.. I now also figured out that this carburetor does not have a full time vacuum port lol. Both are ported/timed. Only reason I discovered this is because I looked at jegs website to get the jet specs. I had no idea. F***** smog carb :-)
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post #18 of 18 Old 09-07-2013, 03:48 PM
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Originally Posted by phil8825 View Post
Ok, so went out and bought a timing light... At idle ( ported vac disconnected and plugged) its holding at 13. 1500 RPM @ 20, around 3000 its at 15-16.. Is it supposed to increase and then decrease like that.. I have no idea :-)

The eddy carb is a 1400 carb, so i gotta look at what it comes with in terms of jets. I didn't change anything.
No it's not. Your ignition module may be causing some of this. I'm not sure.

Here's how to figure it. Let's say 13* initial timing at idle. As RPM increases, the advance should increase proportionately until 3000 to 3500 RPM. Total advance should be about 32 to 36*.


That's if you had no vacuum advance. If the vacuum advance adds 10*, it would be:

13 initial +9 in the distributor weights+10 in vacuum advance for a total of 32*

If you own a Renix Jeep, you'll want to check this out.

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