been having trouble starting my car when it gets hot. I thougt it was the starter (its a robbmc) sent it back to them and checked out fine. They seem to think something in the engine or trans is seizing up when it gets hot. Does anybody have a clue as to where I should start looking for a prob? its a 727 just had it rebuilt 2 yrs ago not even a 1000 miles on it and a hughes convert. I also have the 440 source 512 stroker kit. Man im stumped on this and any help would be appreciated

Get it hot and then turn it over with a torque wrench
(get a base line first.... just warm)... if its a auto
the trans shouldnt come into play

Too much initial timing advance or a bad ground. If your battery is in the trunk, you might want to run a ground cable all the way to one of the starter bolts, or at least from a starter bolt to the front subframe.

Having these issues myself , got two batteries on this thing too , gonna wrap the starter motor with a heat barrier mat , my thinking is the headers are heating the starter motor , i use a switch across the MSD trigger wire so eliminate starter kickback , also use a start retard , with the coil lead removed from coil it's still sloooww to crank.

Mr p body not to sound stupid but what am i looking for when i do that?
As far as the ground its grounded right to the starter bolts.
Now on the timing (not to sound stupid here either) what difference would it make if the engine was hot or cold? There is no vac advance its a dist from 440 source basically a procomp dist.
And as far as the starter wrap-blah didnt help at all
Thanks again for the help guys

What is the timing locked at?

starter most likely still bad
even tho it checked good
put new starter on see what ya get

Ok i will try that
now what diff does the timing make if its hot?
now as far as locked timing i dont quite understand that im not sure of the init but total is 32 i believe

When the problem occurs disable the ignition and see if it turns over faster.

the dist does not have a vac advance its a 2 wire hook up
now i did run a sep starter switch so i can turn the motor over without the ign on still same problem

You need to look at all the basics first. How many amps is it drawing when cranking, how big of a ground wire and feed wire you have for the distance to the starter from the battery. how many amps will the battery load at. I have seen a inadequate ground wire (one not large enough) realy give alot of slow cranking hot problems. When the motor and the starter are hot they draw more amps so that is why more cable is needed.

Do you use a master disconnect switch like is required if the battery is in the trunk?

If so, does all power run through the switch?

well no im not using a master discon switch and alltho i am using 2awg welding cable wire for the main power supply and the ground maybe that wire just isnt big enough when i try to crank it over when its hot the voltage drop at the batt is like 8 and at the sol its 4.65.
when i get the starter back im gonna let it get warm and try to put a breaker bar on the crank and see if i can turn it i have a feeling it will and i'm thinking that the batt cables are just not big enough because thats a loooooooot of drop in voltage i could be wrong.

I did speak with the engine builder and he said that he had no problems with the stroker kit as far as clearance or bearing issues etc but i know that doesnt mean there's not a problem but he was confident in saying that there should be no problems with the motor at all. He also said if there was a problem you would have it all the time with something like that. I changed the oil no shavings or anything like that either. the car runs great other than the starting issue when hot.

If there is anything else im missing please let me know i dont know everything and altho i do know quite a bit i can always learn something from you guys that have been around the block and i appreciate the help.

Sounds like you have a major voltage issue... way too
much drop

oh i know but what would cause this? A fella on here said a hot engine and starter would take more to start if thats the case what size wire should i use? I am using a 2 awg now and its in the trunk. I did try to jump start it when its hot but that didnt work either. any other thoughts? and thanks again for all the help and info guys

A small gauge wire will create more electrical resistance, hence a greater voltage drop. A thinner/smaller wire dissipates more heat. And then it's prone to melting its insulating layer and shorting, not a problem here but a good idea to keep in mind for an upgrade to overkill (0 Gauge). A longer wire will create a greater voltage drop per foot.

High compression, a lean carb setting and more mech. ignition advance together create more loading on the starter. When metal parts get warmed to running temp they swell and reduce clearances, ring gaps close up a bit and if all your machining is right that's what proper sealing will get you. All metals have an expansion rate relevant to heat.

Water in the combustion chamber can create a huge cranking problem, hydraulic lock, probably not in your case. I'd consider pulling the plugs and checking them while cranking it over to see how fast it'll spin.

It's probably an electrical issue with the battery leads being too long and too much voltage drop. Verify your connections as all clean and secure. Batteries full, no dry cells. How old are they? Do you run an alternator or have they been severely deep cycled to death too many times.

We've tried to help guys on this site troubleshooting racecar starter problems before and it's hard to analyze without being there. It's usually the simplest stuff that gets overlooked.

You have 2 problems that I can see already. One The battery drop is too low. If you have around a 800 cca battery and it is load tested for the amperage it should not drop bellow 9.4 volts.Two you should not see that much drop at sol. So first look at your battery issue and then see how much a voltage drop you have at sol.

Easy check , jumper cables and a good battery, jump it off the solinoid . Sounds like you have a bad connection some where or your battery is about gone. What's your battery voltage check out to at the battery?