Nick---There is enough space between the cap towers to separate the
firing on the six. You could be on the right track by modifying the
rotor tip. Cutting off the entire back half of the brass tip will not
hurt a thing. First, notice exactly where the rotor tip is in relation
to the cap tower when the timing degree indicator on the pulley says
"fire". You want the rotor dead-center to the tower, so the spark can
only go to the right plug wire. Shortening the rotor tip to half its
width helps the cause.
Resistance to firing, either from the plug wires or the plugs themselves
(as Mitch pointed out) can also make spark arc inside the cap. This
energy has to go somewhere.
The Mallory distributor is a wonderful piece of work, but you should
still be able to get the Lucas to perform without the problems you now
face.
Dick
Nick wrote:
Spam Alert: Re: Hi Energy Ignitions?
Hi Dick,
Phasing was my first thought, but I drilled a
hole in a spare cap and no matter what I tried I could still hear
arching in the cap. I even took my rotor and filed the long nose off
that the TR6 rotor has thinking this would help. I hope I'm wrong but I
think I have an unsolvable problem. In doing some research last night I
found out that this is a common problem with HEI systems adapted to
older cars, seem the towers on the older distributor caps are too close
together and the spark is crossfiring all over the place. I brought this
concern up with the Crane Tech Dept. before I purchased the system and I
was assured this wouldn't be a problem , I hope their right but my gut
tells me this problem can't be fixed without a different cap, which no
one makes.
Let me know if you have any other ideas, Nick
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