My engine issue with similar symptoms was the distributor and cam gear mesh.
The gear meash "wore" out and eventually slipped making for timing and reving
well impossible. this particular cam was a new "billet" from the UK a couple of
years ago.
md
>From: "Jack W. Drews" <vinttr4@geneseo.net>
>Date: Tue Aug 09 14:39:02 CDT 2005
>To: Joe Boruch <jaboruch@netzero.net>, fot@autox.team.net
>Subject: Re: Engine won't run
>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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