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Spark advance question
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Author:  Jerry [ Tue May 07, 2002 8:24 pm ]
Post subject:  Spark advance question

My total advance of 30* is made up of 8* initial and 22* centrifugal in the dist. My question is, would a combo of 4* initial and 26* centrifugal give me the same results? How far from TDC can you stray before you want to make a change?

roxnjer@aol.com

Author:  Dart270 [ Wed May 08, 2002 6:37 am ]
Post subject:  Re: Spark advance question

Quote:
: My total advance of 30* is made up of 8*
: initial and 22* centrifugal in the dist. My
: question is, would a combo of 4* initial and
: 26* centrifugal give me the same results?
: How far from TDC can you stray before you
: want to make a change?


In general, the second choice will give you slightly worse throttle response and idle (especially with a hotter cam/comp), and similar total power. The first would be my preference, and I usually run more initial advance (at least 10 deg) on my motors.

Lou

Author:  Doc. [ Wed May 08, 2002 10:07 am ]
Post subject:  Re: Spark advance question

Quote:
: In general, the second choice will give you
: slightly worse throttle response and idle
: (especially with a hotter cam/comp), and
: similar total power. The first would be my
: preference, and I usually run more initial
: advance (at least 10 deg) on my motors.
: Lou


I'm with Lou, I set my initial timming first to find the place where the idle and throttle response is good with out shut-down "run-on".

Once I find an initial setting I like, set the mechanical to get the needed total. The last step is selection and setting of the vacuum advance pod and spring rate.
DD

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