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I have a 66 big block with side exhaust. The engine cranks fine when its cold. When the engine is hot, it cranks very slowly. Is this a problem with the starter itself or the solenoid? Do i need to replace either of the parts to solve the problem? Would a heat shield over the starter solve the problem? Thanks for any input.
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Re: 1966/427 hot starter problem
make sure the positve battery wire is as far from the exhaust as possible as the resistance of the copper wire goes up as it heats up. -
Re: 1966/427 hot starter problem
make sure the positve battery wire is as far from the exhaust as possible as the resistance of the copper wire goes up as it heats up.Comment
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Re: 1966/427 hot starter problem
The heat shield helped the problem on my 65 327. Check Long Island Corvette
for parts.Comment
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Re: 1966/427 hot starter problem
The heat shield helped the problem on my 65 327. Check Long Island Corvette
for parts.Comment
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Re: 1966/427 hot starter problem
-------While you have two good answers let me add that the field in your starter may have gone south. Big motors with big compression tend to work those starters pretty hard. I have a 64 421HO Grand Prix and after exhausting all other possibilitys I installed a new field and my problems were over..........Bill SComment
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Re: 1966/427 hot starter problem
-------While you have two good answers let me add that the field in your starter may have gone south. Big motors with big compression tend to work those starters pretty hard. I have a 64 421HO Grand Prix and after exhausting all other possibilitys I installed a new field and my problems were over..........Bill SComment
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Re: 1966/427 hot starter problem
Tom I just had a friend over this weekend that had a 72 chevelle with the same problem. I took a small piece of A/C duck board and wedged it between the starter and the exaust man. Then I took a 3'6" of welding cable which carriers alot more amps then stock cables. He called me that night and was thrilled to say the problem was gone. He had drove it aprox. 30 miles to his house and said it would crank right up, something it would never do before. I think it was due to the cable more then anything but both did the trick!!Comment
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Re: 1966/427 hot starter problem
Tom I just had a friend over this weekend that had a 72 chevelle with the same problem. I took a small piece of A/C duck board and wedged it between the starter and the exaust man. Then I took a 3'6" of welding cable which carriers alot more amps then stock cables. He called me that night and was thrilled to say the problem was gone. He had drove it aprox. 30 miles to his house and said it would crank right up, something it would never do before. I think it was due to the cable more then anything but both did the trick!!Comment
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Re: 1966/427 hot starter problem
Tom-----
A 1966 L-72 did not originally use a starter solenoid heat shield. However, a 1968+ shield of GM #3943647 can be retrofitted. The shield is discontinued from GM, but available in reproduction from sources like Dr. Rebuild, Paragon, Corvette Central, etc.
A shield may help the problem. Also, the suggestions offered by others may help a lot, too. However, based on my experience (which is extensive on this, particular, subject) the only 100% positive cure for this problem is the installation of a remote solenoid. I once fought this problem for YEARS and tried every solution imaginable (including a NEW, not-rebuilt starter). From time-to-time, though, I'd get the hot restart problem. The "from time-to-time" was the worst part of it; you never knew when it was going to "strike" and leave you "cooling your heals". The remote solenoid ended the problem forever. I tested the car with it installed in Death Valley in July many years ago. No hot restart problem, whatsoever. And, I've never had one since, either.In Appreciation of John HinckleyComment
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Re: 1966/427 hot starter problem
Tom-----
A 1966 L-72 did not originally use a starter solenoid heat shield. However, a 1968+ shield of GM #3943647 can be retrofitted. The shield is discontinued from GM, but available in reproduction from sources like Dr. Rebuild, Paragon, Corvette Central, etc.
A shield may help the problem. Also, the suggestions offered by others may help a lot, too. However, based on my experience (which is extensive on this, particular, subject) the only 100% positive cure for this problem is the installation of a remote solenoid. I once fought this problem for YEARS and tried every solution imaginable (including a NEW, not-rebuilt starter). From time-to-time, though, I'd get the hot restart problem. The "from time-to-time" was the worst part of it; you never knew when it was going to "strike" and leave you "cooling your heals". The remote solenoid ended the problem forever. I tested the car with it installed in Death Valley in July many years ago. No hot restart problem, whatsoever. And, I've never had one since, either.In Appreciation of John HinckleyComment
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Re: 1966/427 hot starter problem
Tom,
In the twenty plus years that I've had my 66 425 HP car, I've never had a hot restart problem, even after a heat soak in 115 deg Arizona temps. Two important issues are the starter itself and the positive battery cable, as others have mentioned. It's important that you have the correct armature and field coil for a big block. If you have an auto parts rebuilt, it's likely their not the correct parts. These rebuilt units would likely have much less expensive replacements. I don't think the BB armature is available from GM or Delco today and I'm not sure about the field coil.
The other thing I did was replace the original positive cable with a good quality high strand count cable.
A starter heat shield sure can't hurt but these cars didn't have any problems with hot restart without shields when they were new so there's really no reason why they shouldn't crank today.Comment
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Re: 1966/427 hot starter problem
Tom,
In the twenty plus years that I've had my 66 425 HP car, I've never had a hot restart problem, even after a heat soak in 115 deg Arizona temps. Two important issues are the starter itself and the positive battery cable, as others have mentioned. It's important that you have the correct armature and field coil for a big block. If you have an auto parts rebuilt, it's likely their not the correct parts. These rebuilt units would likely have much less expensive replacements. I don't think the BB armature is available from GM or Delco today and I'm not sure about the field coil.
The other thing I did was replace the original positive cable with a good quality high strand count cable.
A starter heat shield sure can't hurt but these cars didn't have any problems with hot restart without shields when they were new so there's really no reason why they shouldn't crank today.Comment
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Re: 1966/427 hot starter problem
Mike - any way to discern the BB armatures and coils? I have a date correct starter for my 66 425 and would like to check before I rebuild it. Having said that, my 81 C20 pickup with a 454 and headers (I know)...left me cooling my heels as Joe stated on Saturday with heat soak. Has a lifetime warranty AutoZone special, I am sure it doesn't have the correct parts inside..LOL. Next project on tap?........take the freaken headers off and get back to a stock exhaust, since I can't get to the starter through the headers anyway, and I am sick and tired of flowmasters sound behind the headers. Not one of my better ideas, but I did get the kid hot rod out of me...... CraigComment
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Re: 1966/427 hot starter problem
Mike - any way to discern the BB armatures and coils? I have a date correct starter for my 66 425 and would like to check before I rebuild it. Having said that, my 81 C20 pickup with a 454 and headers (I know)...left me cooling my heels as Joe stated on Saturday with heat soak. Has a lifetime warranty AutoZone special, I am sure it doesn't have the correct parts inside..LOL. Next project on tap?........take the freaken headers off and get back to a stock exhaust, since I can't get to the starter through the headers anyway, and I am sick and tired of flowmasters sound behind the headers. Not one of my better ideas, but I did get the kid hot rod out of me...... CraigComment
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