Thanks, Dave -- you and I think alike. I, too, had concluded that this was a
mixture issue. We adjusted it richer, without effect (except sooting up the
back of the car at lower revs). We changed to the richer needle which Rimmer
Bros. supplies with its header and sport exhaust systems, again without
effect. Thinking it was dry bowls, we jacked up the float until fuel started
gushing out and flooding the motor. Tried a new (different) fuel pump
without any change. We'll be changing to an electric fuel pump and larger
diameter tubing to use with the Webers
I think you could be correct about the weak spark, as well.
The part I didn't mention is that this is the engine which we discovered has
the TR6 head on it with the great big combustion chambers, giving like 7.5 or
8.0:1 compression in the 2.5 motor -- in the 2-liter, the compression is even
less (roughly 20%? ;-) -- like 6.2:1 or so). I'm thinking this low
compression, combined with a weak spark and maybe dry bowls might be the
sources of the problem.
Maybe Andy has one or more of these issues working against him as well.
Andy, certainly I'd recommend trying the plug out procedure which Dave so
ably described. It was inconclusive in our case, but might show you
something which leads you to the solution. Our solution was to pull the
&$&%&$% thing apart and rebuild it so that we're starting from a known
quantity. The DPO's little gift of a TR6 head was a surprise.
Scott
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