JeepForum.com - Search Results
Advanced Search
Showing results 1 to 10 of 10
Search took 0.01 seconds.
Search: Posts Made By: Matt1981CJ7
Jeep Forums: Jeep CJ Forum   12-03-2015, 09:47 AM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Brian, You should be able to determine what...

Brian,

You should be able to determine what the factory sea level jetting is for your carb. Then use the elevation jetting rule-of-thumb from there.

You are correct. Jetting for elevation...
Jeep Forums: Jeep CJ Forum   12-01-2015, 12:27 PM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Brian, I think I would re-jet for your...

Brian,

I think I would re-jet for your elevation before you try drilling/tapping your metering block.

Altitude jetting/tuning has made a world of difference on my Weber and Q-jet carbs. I've...
Jeep Forums: Jeep CJ Forum   12-01-2015, 08:15 AM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Here's a quote I snagged from a knowledgable...

Here's a quote I snagged from a knowledgable member over on the Corvette forums:



Good luck,

Matt
Jeep Forums: Jeep CJ Forum   12-01-2015, 07:55 AM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
If you set initial timing to 8* with the vac...

If you set initial timing to 8* with the vac advance connected to manifold vacuum, then your timing is severely retarded and this is likely the cause of the backfiring thru the carb.

Just pull...
Jeep Forums: Jeep CJ Forum   12-01-2015, 12:45 AM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Did you have the vac advance disconnected, and...

Did you have the vac advance disconnected, and the vacuum source plugged, when you set the timing?

IIRC, a backfire thru a Holley carb will ruin the power valve, so expect to replace that.
...
Jeep Forums: Jeep CJ Forum   11-20-2015, 01:19 PM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Yeah, when you get your idle vacuum up to around...

Yeah, when you get your idle vacuum up to around 18", then you should be leak free, and carb tuning will be much easier.

Matt
Jeep Forums: Jeep CJ Forum   11-20-2015, 01:10 PM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
To clarify. You need a PCV valve, connected to...

To clarify. You need a PCV valve, connected to manifold vacuum at the carb, in the front hole.

The rear hole is just a open fresh air intake to the PCV system. It either connects to the air...
Jeep Forums: Jeep CJ Forum   11-20-2015, 01:05 PM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Maybe this will help. Heres the factory setup...

Maybe this will help. Heres the factory setup and some reading for you:

http://home.sprynet.com/~dale02/vac-pcv.htm

Matt
Jeep Forums: Jeep CJ Forum   11-19-2015, 11:25 AM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Wait, what "valve cover inlet to the carb"? Are...

Wait, what "valve cover inlet to the carb"? Are you talking about the PCV valve? That should remain connected.

Matt
Jeep Forums: Jeep CJ Forum   11-18-2015, 04:24 PM
Replies: 46
Views: 2,531
Posted By Matt1981CJ7
Brian, I suggest you buy, or rent, a timing...

Brian,

I suggest you buy, or rent, a timing light. Carb tuning without the proper timing is a waste of time.

Also, your vacuum is very low, assuming your cam is stock. If 12-13" is the best...
Showing results 1 to 10 of 10

 
Forum Jump
 
For the best viewing experience please update your browser to Google Chrome