I had a somewhat similar problem last year at the last race of the
season. First it would run right, then it would run awful, and
finally it quit altogether. Every time I checked the timing, it was
different. Yep, cam gear was not bolted tightly to the camshaft.
Every once in awhile I get a renewal on my humility subscription.
At 12:08 AM 8/9/2005, Joe Boruch wrote:
>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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