Bob Allen,
Thanks for the reply, Bob. My question wasn't phrased very well.
I know how to calculate the circumference of the crankshaft pulley and
to turn that measurement into degrees, for the purpose of setting the
timing on a running engine at max advance, but what I'm trying to figure
out is how to calculate a dwell angle that is equivalent to the feeler
gauge settings.
F'rinstance, the TD has three cams used in its distributors. One gets a
gap of .010-.012, for which the dwell angle is 41-49 degrees. The second
gap is .010-.012, and its dwell is 45-53 degrees. And the third gap is
.014-.016 with dwell angle at 57-63 degrees. These cited equivalents were
in the T-Series Handbook, and probably worked out by the tireless Chip
Old.
Bob
On Mon, 08 Sep 1997 13:20:24 -0500 Robert Allen <boballen@sky.net>
writes:
>ROBERT G. HOWARD wrote:
>
>> Does anyone know how to calculate dwell settings for contact
>breaker
>> gap, so we can set the gap more accurately than with feeler gauges?
>> Thanks for the advice, in advance.
>> Bob
>
>Hi Bob,
>
>I'm not sure I understand the question. Setting the dwell with a dwell
>meter is
>the dynamic equivalent of setting the point gap with feeler gauges. My
>C/GT is
>set around 35 and a four banger motor is, what, 60 degrees?
>
>Remove the cap, ground the high tension lead, then hook up the dwell
>meter on
>the distributor side of the coil (-) and ground. Use a remote starter
>switch and
>spin the motor. The dwell meter will show how many degrees the points
>are closed
>(or maybe open, I forget).
>
>Just barely loosen the point's plate such that you can just lever the
>points
>back and forth with a screwdriver in the little slot. Spin the motor
>again and
>then twist the screwdriver to set the dwell angle to any value you
>like. Once
>set to spec, when you now check the gap it will be remarkably close to
>the point
>gap spec for the car.
>
>I like a dwell meter as I think the setting will be more accurate than
>feeler
>gauge -- I have a heard time figuring how tight the fit should be. Too
>tight and
>you are measuring the spring tension of the point set.
>
>You can also, while the car is idling, check the dwell with the meter.
>It's a
>good way to see if the point gap has wavered off of spec.
>--
>Bob Allen, Kansas City, '69CGT, '75TR6, '61Elva(?)
>"There is a difference, sometimes, between what is legal and what
>ought to be
>done" -- Bill Clinton, March 7, 1997
>
>
>
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