timing a 15mm rotary December 31, 2010 11:30AM
I recently acquired a 15mm rotary pump to try for a few runs. I know i ve heard good and bad things and yes some people just have to find out for themselves that being me. Just wanted to save a little time with the timing of it. Open to all suggestions. Thanks.
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Re: timing a 15mm rotary December 31, 2010 01:32PM
you will need to know how much, if any intervance is built into the pump?
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Re: timing a 15mm rotary December 31, 2010 05:02PM
Hey just call me and my father Bob aka JAWS we know how to make a rotary run like a mofo!!
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Re: timing a 15mm rotary January 01, 2011 05:26AM
I do know the advanced was locked out on my old pump. But i believe this one isnt. I will have to double check.
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Re: timing a 15mm rotary January 01, 2011 05:38AM
Dose the timing needle have a bend in it? Is this a big nut Hyper? There a meny questions you need to have answered before. I ran a 15 mil big nut for years untill they lifted the stock pump rule in our area..
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Re: timing a 15mm rotary January 01, 2011 10:12AM
yes it is to both questions.
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Re: timing a 15mm rotary January 01, 2011 12:55PM
more than likely it has the 9deg advance in it. when I had a 3x3 I was around the 28deg mark on the flywheel but I do remember being at 32 towards the end. I guess it depends on your rpms, cubes, turbo and all the little things. I did notice it did not like limited rpms well at least the one I had. so there is a start for you good luck
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Re: timing a 15mm rotary March 15, 2013 12:58AM
Quote
pump freak
I recently acquired a 15mm rotary pump to try for a few runs. I know i ve heard good and bad things and yes some people just have to find out for themselves that being me. Just wanted to save a little time with the timing of it. Open to all suggestions. Thanks.

What does the bent pointer usually mean? Its bent down then corrected to point straight again on a 13mm.
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Re: timing a 15mm rotary March 15, 2013 05:22AM
We ran ours all last year on 18 degrees we never advanced the timing anymore. it ran good enough at stock timing that we left it that way. I would say start at stock and maybe bump it a degree or two at a time.
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Re: timing a 15mm rotary March 15, 2013 02:55PM
If you have ben pulling awhile then u must know how to spill time a pump. I would do it that way !!!! If you have a hyper small nut 15mm pump i would not time it over 20 mine worked the best at 19.5 degrees started fine we ran a 3000 rpm class with a 600 ci motor hope this helps
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Re: timing a 15mm rotary March 16, 2013 12:38PM
i would say around 26 to 28
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