C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Oct 5, 2014 | 01:03 PM
  #1  
rsonjohn's Avatar
rsonjohn
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Default 1972 c3

Is there a solution to the issue of a 455ci being hard to turn over when the engine is warmed up and at operating temperature? Cranks over fine when cold but not when warmed up.

Thanks
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Old Oct 5, 2014 | 01:14 PM
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From: anchorage ak
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First off is it a 455" or a 454" not that it matters toward your question. Secondly toward your question, a new starter, probably a stock starter, but say there's something not elaborated to, a high torque starter might be better and if all else is good a starter would fix it.. But before you buy a starter, what is your initial timing set at, do you know more about the engine, compression, cam ect. Is it stock or modified? How long sense the last rebuild? What temp does it operate at? Does it have oil leaks at the valve cover? You might not need a starter, but with out knowing specifics were only guessing.

DO MA NEU!

Last edited by bluedawg; Oct 5, 2014 at 01:16 PM.
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Old Oct 5, 2014 | 01:50 PM
  #3  
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rsonjohn
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Default C3 454

Stock engine, rebuild approx 5000 miles ago, operates at 210 deg. I did not rebuild the engine. I suspected the timing may be advanced to far, or possibly the starter may be weak, starts fine when cold, Have not checked the timing. what would be the correct setting above top dead center?

Thanks




Originally Posted by bluedawg
First off is it a 455" or a 454" not that it matters toward your question. Secondly toward your question, a new starter, probably a stock starter, but say there's something not elaborated to, a high torque starter might be better and if all else is good a starter would fix it.. But before you buy a starter, what is your initial timing set at, do you know more about the engine, compression, cam ect. Is it stock or modified? How long sense the last rebuild? What temp does it operate at? Does it have oil leaks at the valve cover? You might not need a starter, but with out knowing specifics were only guessing.

DO MA NEU!
Reply
Old Oct 5, 2014 | 02:36 PM
  #4  
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bluedawg
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From: anchorage ak
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Originally Posted by rsonjohn
Stock engine, rebuild approx 5000 miles ago, operates at 210 deg. I did not rebuild the engine. I suspected the timing may be advanced to far, or possibly the starter may be weak, starts fine when cold, Have not checked the timing. what would be the correct setting above top dead center?

Thanks
I'd try a 160 or 180 degree thermostat, while 210 degrees is not off the chart, it's a lot higher than I'd prefer. Definently check your timing, and if it seems right, the next time you have starting issues try retarding it some, this might indicate that your initial is off or your curve is coming in to quick via worn out springs in the mechanical advance. It don't take much when a starter is worn down.

DO MA NEU!
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