heat soak 66 coupe 200 ci - Vintage Mustang Forums
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post #1 of 17 (permalink) Old 05-19-2019, 04:13 PM Thread Starter
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Talking heat soak 66 coupe 200 ci

having problems with heat soak, drilled holes in hood (hated to do it) it has helped with shut down heat soak but did not stop it. also have had heat boil the fuel when at freeway speeds, then traffic jam and dead stop, boils the fuel (damn ethanol) thinking of running cooler air from in front of grill to see if that helps. stock motor, Daytona carb, larger exhaust manifold (ceramic coated). engine does not overheat. any suggestions??
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post #2 of 17 (permalink) Old 05-19-2019, 04:43 PM
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I've never heard of drilling holes in the hood to relieve heat soak. How bad does that look?

Lots of guys on here have 6 cylinder engines and don't complain about boiling gas. Is your fuel line routed away from the exhaust manifold?
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post #3 of 17 (permalink) Old 05-20-2019, 12:17 AM Thread Starter
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fuel line is not near the exhaust, it is shrouded with electric pump feed, have seen many down here in Florida that have vented hoods for that reason. my car is daily driver and run the speed limit at 60 to 75 mph except in town then slower
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post #4 of 17 (permalink) Old 05-20-2019, 01:15 AM
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If you are having Heat soak on a 6 banger... You have bigger issues than you think... If you've added Headers, Dual carb and other mods, I'd look there first.. Hook up a temp guage so you can get "Real Time" readings of what's going on. Also buy on of those Digital laser Temp readers from Ebay for $10 to help you locate the main cause a bit easier.

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post #5 of 17 (permalink) Old 05-20-2019, 06:27 AM
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1 inch phenolic spacer on top of factory spacer. Also don’t run water fro heater hose through factory spacer.
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post #6 of 17 (permalink) Old 05-20-2019, 07:14 AM
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Are you running the metal fuel line from the pump to the carb?

I seem to recall some threads around here suggesting that the metal line retains less heat than if you were running a rubber line and might be better at preventing this sort of thing.

Just wondering here, but if you're running an aftermarket electric pump is it putting out the right pressure? How's that wired in?

And have you tried non-ethanol gas to see if there's a difference? I'm outside Tampa and I think every Wawa around here has non-ethanol available. My 200 doesn't seem to care, but if you're having problems it might be worth trying a tank full and seeing what happens.
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post #7 of 17 (permalink) Old 05-20-2019, 08:23 AM
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I ran across this video that I found interesting. This guy is from Iowa but was spending the summer in Washington DC when he had his issues with heat soak. His solution was to add a fuel return line to send the heated fuel back to the tank.


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post #8 of 17 (permalink) Old 05-20-2019, 09:29 AM
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What do you see when you remove the radiator cap with the engine running? I suspect a problem with the radiator or water pump.
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post #9 of 17 (permalink) Old 05-20-2019, 07:11 PM
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I used to have that problem.

The easy way is to use a fuel filter with a return. Just plumb it in with a "T" back to the feed line. No need to go back to the tank. This worked for me for many years.

Also insulate any under hood fuel lines.
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post #10 of 17 (permalink) Old 05-20-2019, 08:17 PM
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How about a pic of your setup?


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post #11 of 17 (permalink) Old 05-20-2019, 09:13 PM
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Quote:
Originally Posted by 65coupei6_2 View Post
I used to have that problem.

The easy way is to use a fuel filter with a return. Just plumb it in with a "T" back to the feed line. No need to go back to the tank. This worked for me for many years.

Also insulate any under hood fuel lines.

Do you have a part number for this fuel filter?
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post #12 of 17 (permalink) Old 05-20-2019, 10:15 PM
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Excessive rubber fuel line won't help as it won't let the fuel inside shed heat. Also, removing the heater hose from the carburetor spacer doesn't help either as it removes any heat exceeding your water temp (so if your manifold is 250* the coolant circulation LOWERS the temp to the carb) and warms it for better fuel atomization and prevent carburetor icing when ambient air temp is below 60*F. Lastly, the fuel filter with return tee is a stock MOPAR/AMC unit from the sixties through the eighties. Looking for one for a Fifth Avenue with a 318 will probably net you the right one. The bad part? THREE rubber line and hose clamp connections..

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post #13 of 17 (permalink) Old 05-20-2019, 10:30 PM
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How about a pic of your setup?
+1

Also, aluminum carb spacers can transfer an incredible amount of heat to the carburetor after shutdown. I live in a mild climate compared to yours (most of the time), and my wife's 66 boils fuel from the carb after a hot shutdown. I am stuck with her car in that it has an aluminum Weber carb adapter, and I have yet to find/make a phenolic one to better isolate it from the heat.

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post #14 of 17 (permalink) Old 05-21-2019, 01:13 AM
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I had bad heat soak problems with my 289 and now am having similar issues with my 347. I have a 1 inch spacer on there now too. Ethanol free gas completely cured it in the 289 and I haven't tried it yet in my 347. I had a fast idle solenoid hooked up to a switch and would activate it when the problem occurred which helped me get in and out of parking spots-it pulled the idle up just enough to keep in running. I might put that back on the new engine.
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post #15 of 17 (permalink) Old 05-21-2019, 03:21 AM
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My stock six cylinder setup runs fine in 110 degree heat. I have the water running thru a 195 degree thermostat and the stock spacer. I also use the stock phenolic spacer and stock mechanical fuel pump. Nothing jerry rigged here. I do have a three row radiator which in cool weather made it harder to warm up the car. Normal pump gas which is always 10 percent ethanol.



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