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stalled on the track

  • Thread starter Thread starter jmp
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jmp

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I finally got to try out the true capabilities of my LT-1 yesterday -- at a BC Corvette Club slalom. It was awesome! After getting lost on my first run, I followed up with 4 consecutively faster runs (but still 10 secs slower than the fastest guy). I really have to learn how to smooth out my turns -- I tended to fishtail quite a bit!

My last run, however, revealed a potential problem. As the car and the day warmed up, I began to notice a definite 'bogging' whenever I accelerated from a near stop (the course was setup so that you never got out of first, and on some of the sharp hairpin corners you dropped to almost 0, necessitating a push of the clutch). On the very last turn, with the finish line 2 car lengths in front of me, my car stalled.

At first I thought maybe the car bogged and I just release the clutch too soon, instead of 'coaxing' the car into accelerating (by tapping on the gas and slowly releasing the clutch). But the more I think about it, the more I think that may not have happened, because this may have happened before.

Last time I had just finished a 1.5 hour non-stop drive up to the Squamish/Whistler area, and I had to stop to make a left. Well, as soon as I pushed in the clutch, the car stalled. But it hasn't happened since -- including 2 more drives up to Whistler.

At any rate, even if the car didn't just stall, it's still bogging when it heats up.

So, any ideas on what could be causing this behaviour? I've had 4 opinions thus far: carb needs tuning (but it's a new carb, just prof. installed), timing needs adjustment (but it was just prof. adjusted), vapour lock (???), and 'that's just the way carb'd cars are'.
 
Could it be that you are getting slosh in the fuel tank starving the pick up? Maybe a bad float on the carb sticking the inlet closed for a split second after you exerpience a little G force?
 
Maybe, your fuel lines are to close to the exhaust, or
something else that gets really hot, & THE FUEL IS BOILING.

Just a thought. Good luck! gary.
 
Vacuum leak? I had a car that did about the same thing but regardless of heat. When you hit the brakes hard the car would idle too low and want to stall.

It was an automatic though.

-Gooney0
 
gooney0: I don't think it's a vacuum leak simply because the 'vette shop I took it to searched for and found a leak (causing me to fail emissions testing).

The car only idles low after warming up and running for a long time.

gary b: one of the suggestions I got from the guys at the slalom was that all carb'd cars tend to boil away their fuel when the car gets hot. I got the impression that it was just something I'd have to live with.

69MyWay: I doubt it. The tank was really full, and the problem seemed to get worse as the day wore on.

Thanks for the opinions -- keep 'em coming!
 
I'm leaning toward 69MyWay 's camp here. It sounds like it could be something in your carb, such as a float. You carb definitely gets hot after running, especially when it's almost all 1st gear high RPMs. That consistent heat buildup could be causing a float to ever-so-slightly expand, thus hanging up in the carb. Physics...the metals expands as they gets hotter.

Other than that, could it be clutch related? Something about maybe the clutch not actaully releasing when it gets warm??? :confused
When the car stalls, or is about to, can you easily shift it in and out of gear? I'm grasping here...I don't know...
I'm just thinking back to Rick "RalleyRed 's problem at Beech Bend drag strip when his clutch seized up on him... did we ever figure out what caused that? Maybe a similiar problem here???
 
Hmm... I didn't seem to have a problem with the clutch either time it happened. I did have a little bit of a hard time restarting the car -- it usually fires up right away, but both times it stalled I had to wait a few seconds. Flooded?

If it's just the physics of the carb, is there anything I can do? Or is it 'just one of those things'? Can't be though, can it, because people used to (and still do) race these things all the time. So there must be something that can be done such that the car doesn't hesitate in first gear and definitely doesn't stall. Unless it's just that the drivers compensate?
 
Just a thought, but my Dad used to tell me that they put cooling cans on their drag cars. Like a Coffee can with dry ice in it?? I think they ran the fuel line through it??

Not a mechanic....Just a thought.
 
JMP,

Sorry, should have been a bit more clear. The float (or something) could be sticking if it's got gunk on it...the metals get hot, they expand just a bit, possibly causing the gunk to get gooey, and it just enough to cause it to bind or hang up.
 

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