I hope you are all enjoying the weekend, I have a confusing situation that I
thought someone smarter than me might be able to help me with.
I have a very loyal 75 TR6. The vacuum system was cut up many years ago by
the PO. It has a retard unit that I hooked up to a port under the intake
manifold that provides high vacuum at low rpm. When I set the timing the big
blue book tells me to set it at 4 ATDC with the retard unit disconnected.
When I hook the retard unit back up the timing retards to something around 12
ATDC and the car (as you would expect) runs terribly until high RPMs are
reached. To compensate I set the timing at 10 BTDC with the retard unit
connected and all seems right. Do I have the retard unit hooked up to the
wrong vacuum port or is there some real obvious thing I am missing here. Not
a serious problem, I just thought someone may have some insight. Thanks in
advance.
Bruce Crouter
Regina, Saskatchewan, Canada
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