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08-09-2020, 02:20 PM | #1 |
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Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,209
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Hot restart
Twice now after sitting for 10-15 minutes I restarted and the engine just falls on its face. Similar to it its real cold and not warmed up. 90+ air temp, was running A/C prior to shutoff both times. GM 350/357 performance crate motor, Holley 670 CFM carb. Running a mech fuel pump. After a couple of minutes it is OK. Next time I restart after 10-15 min it is OK. Ideas?
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
08-09-2020, 03:20 PM | #2 |
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Join Date: May 2013
Location: Post Falls, ID
Posts: 884
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Re: Hot restart
Carb getting heat soaked?
Are you running ethanol gas? Ethanol can boil at some really low temps. Even non ethanol gas can boil in a hot engine compartment, just not at as low temps. You might try a phenolic spacer to insulate the carb. Also, does your fuel line have a return, or does it just "deadhead" at the carb? Your fuel might be vapor locking between the pump and the carb. Timing set a little to advanced could cause hot start problems also. Do you know what your timing is set at?
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Insert clever text here: Last edited by Greasey Harley; 08-09-2020 at 03:29 PM. |
08-09-2020, 07:49 PM | #3 | |
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Join Date: Mar 2005
Location: Jurupa Valley, Ca
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Re: Hot restart
Quote:
California stuff. What is weird is it is not repeatable. Last week I made a bunch of short trips running errands and it only did it once. Starts right up, just when accelerating pretty much nothing. That's what has me stumped.
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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08-10-2020, 03:04 PM | #4 |
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Re: Hot restart
How old is your carburetor?
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
08-10-2020, 04:39 PM | #5 |
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Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,209
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Re: Hot restart
New this Feb, it came with the new GM crate motor. Then had it chassis dyno tuned.
I'm wondering if what I experienced is a combination of high underhood heat and the open air cleaner sucking in the hot air. Didn't backfire just stumbled with no power.
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
08-10-2020, 04:56 PM | #6 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,512
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Re: Hot restart
Use a heat shield like this.
Keeps the bowls cooler. https://www.holley.com/products/fuel...s/parts/108-70 |
08-11-2020, 03:31 PM | #7 |
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Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Hot restart
I have the same problem. If I drive long enough to get the good and hot, not overheated but a short drive won't do it, then I shut it off for 20 or 30 minutes it will crank as if flooded. If I crank it right back up after shutting it off it won't do it. If I wait until the motor cools down it won't do it.
I have a L31-R crate motor with a Holley carb and electric fuel pump. I have given up on it but I believe it may have something to do with the electric choke closing and the motor still being warm/hot. |
08-12-2020, 03:14 PM | #8 | |
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Join Date: Mar 2005
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Re: Hot restart
Quote:
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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08-12-2020, 09:50 PM | #9 | |
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Re: Hot restart
Quote:
Any other style is never close enough to what you need. |
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08-14-2020, 06:09 PM | #10 | |
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Join Date: Feb 2013
Location: central California
Posts: 2,726
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Re: Hot restart
Quote:
Last edited by AcampoDave; 08-14-2020 at 06:27 PM. |
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