[TR] TRactor Engine Timing

[John & Pat Donnelly]

After rebuilding my TR4A engine I've been playing around with the engine
timing (advance/retard) to dial in the best performance. The engine has the
Moss cam & 87 MM pistons, but everything else is stock. Stock HS6's, stock
distributor with Pertronix, new gears and timing chain. The vacuum advance
is attached.

I never seem to be able to get the full range performance I would expect. I
can get low end to be great but the top end suffers. Redial it and the top
end is great but low end is sluggish.

I dont think the carbs are it, as I've changed to richer needles, made it
richer/leaner, and it didn't help. I did learn that a richer mixture seems
to hide timing differences.

And I got to thinking that the TR4A distributor has an advance limit built
into it and was wondering if going to a more full range dizzy would give me
that full range performance. Shouldn't the dizzy advance and the cam specs
match up? 

Why the limited advance anyway?

BTW, the weather is absolutely bitchin to be driving with top down every day
here in San Diego. I'm loving it.

Johnnie

67 TR4A



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