I had similar problems with my racing Spit. Wouldn't restart after the
engine heat soaked. The only way to get it to restart was to pour cold
water on the intake manifold to cool it. After I had the carbs (SU's)
rebuilt, the problem totally went away. The throttle shafts and
throttle body were worn and apparently there was too much air leakage.
This was verified when we put the car on the chassis dyno last spring.
The only thing changed was the rebuilt carbs, and we had to lean them
out significantly to get the car to run right. Gained about 2 hp.
On 1/6/2013 7:31 AM, Greg & Alison Blake wrote:
> I've got a starting problem with the TR6 I care for. The car starts great
> when cold but after a drive that gets the car up to temp I have an issue
> with the restart. The hot start problem only occurs if I let the car sit
> for more than about 10 minutes. Related things I have done to the car:
>
> Rebuilt the original carbs - byass and temp compensators are locked out
>
> New high torque starter
>
> New battery
>
> Rebuilt dist - problem persists with more or less advanced static timing.
> Currently have it set to where I do not get any detonation at load
>
> New radiator
>
> Removed core plugs and flushed engine - it sat for about 20 years before I
> got it
>
> I've done lots of other work but I think that is all that would be
> applicable to this particular problem.
>
> The car runs right below the halfway mark on the temp gauge and I measured
> that to be 175-180 F at the cap.
>
>
>
> I've read that some of the Stromberg carbs have a problem of boiling the
> fuel out of the floats in conditions like this. I pulled the dash pots last
> weekend when I had the hot start issue and did not see large amounts of fuel
> pooling at the throttle disk. How would I diagnosis this condition and what
> are the solutions other than heat shield? I'll try the coil next just on
> the chance that it is getting hot and not working as efficiently as it
> should when hot. Other than that, I am out of ideas.
>
>
>
> When I do get it to start after sitting about 10 minutes in cool weather, I
> usually have to hold the throttle about half way to the floor to get it
> going. This is would leads me to believe it is carb related/too much fuel.
>
>
>
> Thanks for your suggestions,
>
>
>
> Greg
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