This past weekend I showed up at the SCCA regional at Lime Rock only to have
may car not start in the morning. It would start for about 1 second and then
die off. Checked carbs and there was plenty of fuel in the bowls and I would
see it in the jets. Fuel flowed freely thru the needles. Swapped plugs, plug
wires, cap and it did the same thing. Swapped coil, still the same. Swapped
condensor and it started ok. Went back to the original coil and nothing more
than 1 second again.
I went out for practice and could not get over 5000 rpm without it breaking up.
EGTs were low on the rear cylinders and I realized that while playing with the
floats I set the rear float too high. I lowered it, disconnected the rev
limiter and qualified great and got the Pole with a 1:02.7. Next day for the
race, the car ran great for 2 laps than a miss started and got worse and worse.
I stayed out for the 20 laps, but the car stalled coming into the paddock and
would not start. I did manage to set fast lap with a 1:01.9 in the short time
that the car ran fine.
Next day I found that the timing was very retarded. Advanced it and the car
started and ran great. I run a Mallory Dual point. Why did it retard during
the race? I tore the dizzy apart and found that an advance weight had been
cutting into the housing throwing metal around. I am pretty sure that this is
why it retarded during the race.
I cleaned up the dizzy and adjusted the advance stops so that the weight will
not rub on the housing, but now the car will not run again, just like it did
before practice. It will start for a second and die. I have been swapping
parts, but still it will not run.
There is continuity in the ignition system where it should be and no leakage to
ground. Tried other coils and condensor and wires and rotor. When cranking the
dwell meter shows a steady dwell where it should be. Rev limiter is still
disconnected. Carbs have full bowls and fuel visible in the jets.
It seems like I am chasing my tail. Anybody have any ideas? I am wondering if
the vernier cam sprocket may be slipping? Maybe I should pull the timing cover
off anyway to check for sheared keyways? Joe(B)
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