Slow Cranking when hot - Team Camaro Tech
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post #1 of 8 (permalink) Old May 15th, 15, 06:22 PM Thread Starter
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Tom
 
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Slow Cranking when hot

I just returned from my longest shake down run since I got the car on the road. 130 miles, mainly highway. Getting ready for the Hot Rod Power Tour. No major issues.

However I have one concern. Why does the car turn over much slower when hot? When starting from a cold start it cranks much faster then after it's hot. As an example, stopping for gas. Shut it off for 3 minutes and when I start it, it cranks over very slow. Wait 15 minutes and it cranks faster.
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post #2 of 8 (permalink) Old May 15th, 15, 06:46 PM
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Al
 
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Re: Slow Cranking when hot

What gauge are your batt cables? How old & how powerful is your battery? Condition of charging system? A hot engine has tighter clearances than a cold one and the starter draws more current.


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post #3 of 8 (permalink) Old May 15th, 15, 08:05 PM
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Anne
 
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Re: Slow Cranking when hot

This may help : http://www.summitracing.com/parts/oer-361443/overview/

Some people mount their solenoid remotely but I would try other things first.

As Al mentioned, make sure the ground is good.

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post #4 of 8 (permalink) Old May 15th, 15, 09:41 PM
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Re: Slow Cranking when hot

I guess I'd like to know do you mean the car takes longer to kick over or that the starter is running slower? Could be heat soak on the starter. Do you have headers?


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post #5 of 8 (permalink) Old May 16th, 15, 03:39 AM
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Re: Slow Cranking when hot

Agree, sounds like starter solenoid heat soak.
They make shields and blankets for this, and yes, remote solenoid also. I can't attest to the "what one's better" since I just dealt with it

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post #6 of 8 (permalink) Old May 16th, 15, 06:15 AM
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Al
 
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Re: Slow Cranking when hot

It sounds like the solenoid is doing its job as designed - moving the starter pinion into the flywheel and making the connection between the pos batt cable and the starter motor.

Slow cranking when hot usually means dirty batt cable connections, undersized cables, weak battery (possibly due to faulty charging system) or a problem with the starter motor itself. That's what I'd be looking at.


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post #7 of 8 (permalink) Old May 16th, 15, 08:14 AM
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Re: Slow Cranking when hot

I agree with all and here is my two cents worth. Hopefully you have the 168 tooth flywheel. If the starter is old replace it with a big block hi tork starter. It will have a bigger armature 4 field coils and a shunt. 2 Use the biggest high cranking amp battery you can stuff in there. more than likely a group27 battery for old Cadillac,s.3. install 6 volt battery cables those will get all the power down to the starter. Alex
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post #8 of 8 (permalink) Old May 16th, 15, 08:29 PM
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Kev
 
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Re: Slow Cranking when hot

If the ground isn't to the engine, or not directly to the block, I'd move it. Get out the voltmeter and measure from the negative terminal the the starter case, and then from the positive terminal to the starter positive terminal. Measure when the engine is hot and cranking.
All the solenoid does electrically is switch on the starter motor. Unless its resistive (toasted contacts) it has no bearing on starter speed. Solenoid heat soak is a myth.
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