Holley or Edelbrock ??

[Ranger]

No room for a heat spacer so I stacked 4 gaskets in an attempt to insulate the carb from the manifold. It still percolates for a minute or two when shut down. No idea if it is boiling when running, but I have no driveability problems, but I did have a starting problem yesterday and I suspect it was because the fuel boiled and evaporated out of the float bowls after the last run 3 or 4 day ago (first time this happened though).

P.S.
It has started dieseling when I shut it down lately. Idle is 700 -800 RPM.

 

[Ranger]

I also put a -6 braided line on the outlet of my fuel pump and ran it away from the engine block out towards the passenger fender and then to the inlet of the carb to keep the fuel cooler too.

-6 braided line? Tell me more about this Vince.

 

[bigmanjbmopar]

I like my QFT 780 from quick fuel. I had an 800 eddy and although it is easy to tune it boiled fuel every hot summer day even with a 1" spacer. went to an QFT 850 and now back down to the 780 for drivability. Much easier to tune than the needles and springs for eddy in my opinion. The diamond series QFT are coated and reduce temps in the bowls.

 

[ACME A12]

I've had a 750 Holley on mine for 12 years and never once had a problem of any kind. I put in a power valve protector and a quick change secondary spring module. I never have to adjust it unless I want to check up on it. Its been completely trouble free. And I got it off ebay used for $100.

Having sat behind your car trapped in traffic while it is idling, I'm inclined to guess that the PO of that carb drilled out the idle circuitry with a 1/4" drill bit... :basketcase:

:jester:

 

[mcmopar]

Having sat behind your car trapped in traffic while it is idling, I'm inclined to guess that the PO of that carb drilled out the idle circuitry with a 1/4" drill bit... :basketcase:

:jester:

Yeah - it will fumigate you but from everything we have tried it does not seem to be carb related but rather cam related. The carb is spot on in every way but everyone I have spoken to that owns one of those series of Comp cams says they are really "dirty" smelling at idle. I suspect it has to do with the overlap timing events on the cam. It makes good power and runs beautifully at cruising speed but get it down into the low speed range and it will definitely gas you! I am half-tempted to try some adjustable air bleeds in the carb or get one with adjustable air bleeds already installed (talking $$$) to try and idle tune it. The jets look fine so I know the cruise circuit is working very well but that idle circuit is a problem. I may have to swap that cam out and see if it cleans it ups some.

 

[Ranger]

I can tell you that mine had a very radical cam in it when I bought it and the exhaust was enough to make your eyes water. Never tried it, but I'd bet you could light the exhaust. Since I changed it, it is not bad at all.

 

[Ranger]

As for the percolating, dince I have the carb somewhat insulated, I suspect it may be the fuel line that is heating up.

I'm going to try this.

 

[quikbird]

Now that looks interesting

 

[Ranger]

The one I purchased yesterday was like the top one (sleeve, no velcro). It comes in various sizes 1/2", 3/4", 1" etc in 3' lengths. O'Reiley's did not have one with velcro. I'll test it out tonight at a cruise in and report back tomorrow.

Here is more info on it.
https://www.designengineering.com//...line-sleeving/heat-sheath-aluminized-sleeving

 

[Ranger]

No improvement. Sounded more like it was boiling in the carb.
I'm running about 200 degrees.
FSM calls for a 190 thermostat and that is what I am guessing is in there.
I'm thinking of going to a lower thermostat. I'm thinking 180? (160 is probably too low?)
What are you guys running and for those with a temp gauge, what temps at you running at?

 

[quikbird]

mine is a 180, and freeway runs about 185, in town about 190. they make a flange of heat reflective material that is pretty thin, I think it is called coolcarb, I,ve seen it at the nats swapmeet that sits under the carb to help keep heat out of the carb. thinking silver color with blue lettering.

 

[Ranger]

I like your numbers much better Quickbird. Just swapped the 190 thermostat to a 180. Will see how it reacts on the next drive (probably Mon. 6-1).

 

[Basketcase]

180 in mine, no problems except in town on the triple H days.

 

[Roadcuda]

180 in mine, no problems except in town on the triple H days.

Same here.

 

[Ranger]

That's just what I was hoping to hear guys. Fingers crossed and will advise.

 

[Ranger]

Well I installed a 180 thermostat and drove it to a local cruise night today. She ran a steady and cool 180 and no boiling gas. Problem solved.
Can't imagine why the factory spec'd a 190 stat.

 

[69hemibeep]

Well I installed a 180 thermostat and drove it to a local cruise night today. She ran a steady and cool 180 and no boiling gas. Problem solved.
Can't imagine why the factory spec'd a 190 stat.

Back when they were new the cooling system was fresh, the gas was better and the engine is more efficient at 190. Down in the sun belt a 180 was a must.

 

[Ranger]

Apparently a 180 is a must up here as well. Perhaps it's the ethanol. Hard to pin down though as the boiling point of gas is listed as 100-400 F. That's one hell of a range.

 

[69hemibeep]

A little side story. In order for me to get to northern AZ to the cool country I have to climb a 2200-3000 ft mountain most of it at 6% depending on what Highway I choose, that's just the first hill but your in the desert heat. So my motor home with the trailer and jeep behind it starts getting my attention at 235 degrees but it seams to hold that until the top. Once at the top keep going to cool it down, I see some pull over just to have the coolant boil out. It normally runs 180-190

 

[69/b5/n96]

yes A12 i run the holley 770 and the best hands down !! i have them on all my cars the eddy is eather to fat on idel or leens out at speed no way to make it happy