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05-19-2022, 11:18 AM | #1 |
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Overheating issues
I’ve got the newly rebuilt flathead back in my 40 and it’s running good . Problem is it’s like the farther you go the hotter it gets. With thermostats or without, block is clean, new radiator, rebuilt water pumps , timing is good. Yesterday I removed the upper radiator hoses and filled the heads with water up to the neck and removed the belt so the pumps wouldn’t turn. Cranked it up and looked for bubbles in the heads, there wasn’t anything there so that eliminates a leaky gasket . Before I got this car it sat in an open shed for the probably the last 20 years. I’m beginning to wonder if the exhaust could be partially blocked by mice or something. I’m at wits end with this thing.
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05-19-2022, 01:11 PM | #2 |
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Re: Overheating issues
Nice looking car but sideways is is hard.Try a vacuum gauge on it.It will tell you if have a choked muffler.
Last edited by deuce lover; 05-19-2022 at 01:19 PM. |
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05-19-2022, 01:26 PM | #3 |
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Re: Overheating issues
Ken's '40...
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05-19-2022, 02:57 PM | #4 |
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Re: Overheating issues
Ken, Are the old radiator hoses soft and collapsing and restricting flow?
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05-19-2022, 03:12 PM | #5 |
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Re: Overheating issues
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05-19-2022, 03:15 PM | #6 |
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Re: Overheating issues
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05-19-2022, 03:28 PM | #7 |
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Re: Overheating issues
Yeah, I was expecting it to run hotter since it is all new . Took it for a 10 mile run yesterday and it was pegging the gauge when I got back home. Checked it with my temp gun and both sides were consistent 210 degrees. Best I remember the carb has .051 jets. It has the 91-99 carburetor on it.
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05-19-2022, 03:29 PM | #8 | |
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Re: Overheating issues
Quote:
How hot does it get? Boil over?
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05-19-2022, 03:59 PM | #9 |
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Re: Overheating issues
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05-19-2022, 04:52 PM | #10 |
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Re: Overheating issues
How do you know the timing is good? Did you put a degree wheel on it and put markings and a pointer on it?
If it continues to heat up (and the timing is right), then my guess is that either you're not pumping enough water through it, or your overall cooling capacity isn't good enough. What type of radiator did you put in it? Also, are the water pumps ones with modern impellers (like Skip puts on them) . . . or stock type impellers? |
05-19-2022, 05:53 PM | #11 | |
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Re: Overheating issues
Quote:
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05-19-2022, 06:17 PM | #12 |
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Re: Overheating issues
Is the radiator clean on the inside and can you see the water circulating in the radiator?
Disconnect the lower hoses and flush out the radiator with a hose to check the flow. |
05-19-2022, 06:26 PM | #13 |
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Re: Overheating issues
I’ve eliminated the exhaust possibility . I had an nos muffler I wanted to install anyway. I’m thinking I’ll take the radiator out of my coupe and put it in there and see how that goes. New ain’t always better.
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05-19-2022, 06:42 PM | #14 | |
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Re: Overheating issues
Quote:
Good plan. If it keeps getting hotter the further you drive, it sure sounds like radiator. 210 and steady isn't dangerous but rising from there and losing coolant/boiling is another matter. The radiator swap may be the answer. Terry
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05-19-2022, 09:22 PM | #15 |
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Re: Overheating issues
RE Pumps: I always run Skips pumps on my engines - as I like the way he rebuilds them (bearings, not bushings) and his impeller moves a LOT more water than the small straight impellers on original pumps. The engine in my 32 is 284 cubes and I can be stuck in traffic in 90+ degree weather (stop n go stuff) - and it won't overheat. At the Columbus Goodguy's one year I was sitting idling for about 45 minutes . . . and it passed the test with no problems (and that is with a non-pressurized system).
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05-19-2022, 09:34 PM | #16 | |
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Re: Overheating issues
Quote:
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05-19-2022, 09:54 PM | #17 |
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Re: Overheating issues
What is the condition of the block innards? Was the block thoroughly cleaned out of crud?
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The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
05-19-2022, 11:03 PM | #18 |
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Re: Overheating issues
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05-20-2022, 12:01 AM | #19 |
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Re: Overheating issues
Have you checked your gauges. Ya stupid question.
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05-20-2022, 12:29 AM | #20 |
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Re: Overheating issues
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