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Hot Topic (More than 10 Replies) Aluminum head (Read 2770 times)
 
Brian M
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Re: Aluminum head
Reply #15 - 05/27/18 at 02:01:27
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Well I finally got the Weber tuned I think. I started out trying to use the feel method and that didnít work out that well so I bought an AEM wideband O2 sensor and then I could see what was really going on. I was having a lot of trouble with a hesitation off idle without having to rich of a main jet and ended up changing the F50 emulsion tube to an F6 and that cured it, I want to try an F3 because my gauge still goes a little lean right off idle sometimes but they arenít available right now.

My original jetting on the primary started out at:
50 idle jet
155 main
160 air correction
F50 emulsion

Iím currently running:
47 idle jet
160 main jet
190 air jet
F6 emulsion
The secondary is:
50 idle jet
165 main
195 air jet
F50 emulsion

When I started out the gauge always read rich (10s and 12s) and I was getting 13.5 mpg, my last tank I got 17.5 mpg and I might get a little more because I went up a size on the air jet close to the end of the last tank of fuel. The air jet actually seems to make quite a difference on mileage. Now the Jeep idles at 12.5-12.7AFR, and when Iím cruising down the freeway it says 14-15 depending on load, unless Iím come to a hill or anything that requires more throttle then it goes back to 12.5.

Iíve driven the Jeep about 1000 miles since I had the valve problem and now the only trouble I have is it trying to get a little warm on the freeway when it gets close to 80 degrees, so I have a new 4 core radiator on its way.

« Last Edit: 08/25/18 at 14:12:49 by Brian M »  
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aboyandhisdog
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Re: Aluminum head
Reply #16 - 05/28/18 at 16:32:14
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I would get a bit hot in the warm temps too.  Not terrible but approx.  110 degrees plus the ambient temp.  So if it was 90 degrees out, I might hit 200 on a slight up slope.  Hotter than I would like when I know there are guys that never get above 180.  Anyway, tried different things - thermostat, water wetter, pump is good, radiator is good.  We still have hot weather to come, but I think I have solved the issue by putting a different fan blade on.  I had a worn out flexi-fan, and put on a new Derale Flex fan and I am running cooler.  Haven't tried the OE fan, but I think I'm where I need to be now.
  

Tom

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mtnman37879
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Re: Aluminum head
Reply #17 - 05/28/18 at 22:21:55
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The more compression you make, the more heat you make. Try some water wetter. It's a coolant. I ran it in a High performance 300 six cylinder I used to race. It lowered the temperature 25 degrees.
https://www.jegs.com/i/Red-Line-Oil/816/80204/10002/-1
« Last Edit: 05/28/18 at 22:25:20 by mtnman37879 »  

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Brian M
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Re: Aluminum head
Reply #18 - 08/25/18 at 14:20:19
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I finally got a new radiator in, what a mess though, do not buy one from prime cooling on eBay. The first one came damaged because their packaging isnít that great, so they sent me another. Again it came in damaged, this time worse. I contacted them and they wanted to refund me all but $30 and I keep the radiators. I told them I didnít want to pay for broken radiators I canít use and just wanted a good one. They said they told ups to be careful with it and wouldnít send another one, they did refund all my money though. I wasnít going to let them go to waste so I got the side off and fixed the damaged tube, then had to build new brackets because the ones it has are nowhere near right. Itís all in now and seemed to work fine now.
  
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aboyandhisdog
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Re: Aluminum head
Reply #19 - 08/25/18 at 14:28:22
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Are you running cooler?  Did the rad solve your issue?
  

Tom

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Brian M
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Re: Aluminum head
Reply #20 - 08/25/18 at 19:10:49
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Yep, I ran it on an 87 degree day and it had no trouble, even ran through town some and it had no trouble staying at 180 with the fan off.
  
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Brian M
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Re: Aluminum head
Reply #21 - 09/02/18 at 20:03:13
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And they say old Jeeps can only go 45.
  
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