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 18Likes
07-26-2016, 01:45 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
I'm confused now. Lol. Blykins likes mechanical. I'll go with his recommendation.
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PRIDEnJOY
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07-26-2016, 02:03 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Whatcha confused about?
MSD has a Pro Billet distributor with mechanical advance and they also have a Pro Billet distributor with vacuum advance, set up to run without an ignition box.
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07-26-2016, 02:44 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Isn't the only MSD distributor that fits an FE, and has a vacuum advance unit on it, that funky "Ready to Run" job that they have?  |
07-26-2016, 02:51 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I believe so. You could always run a Mallory or a factory Ford distributor if you wanted a vacuum advance. Or you could do it the way lippy does it.
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07-26-2016, 03:28 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
What are the pros on not using vac advance??
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PRIDEnJOY
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07-26-2016, 03:36 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by fordracing65
What are the pros on not using vac advance??
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I went with the 8594 Pro-Billet MSD all mechanical because I didn't care about gas mileage, and not having a vacuum advance unit on it is just one less thing to screw with when you're trying to get your curve just perfect. |
07-26-2016, 03:56 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,916
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Not Ranked
Quote:
Originally Posted by fordracing65
What are the pros on not using vac advance??
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It's simpler - one less thing to worry about.
OTOH, distributors with vacuum advance also have mechanical advance.
Mechanical advance is controlled by weights on springs, spinning on the dist. shaft. They advance timing as RPMs increase. Mechanical advance is necessary if you want to rev over 2000 RPM, so it's always there even if you don't think you have it. ALL distributors have it - except those used only as signals to an ignition box with timing curves.
Vacuum advance is there purely for efficiency. It advances the timing based on engine load. High vacuum = low engine load, so the engine can run more timing with no problems and deliver better fuel economy. The round vacuum can on the side of the distributor does this. You can disconnect the vacuum line (and plug it) to do without the vacuum advance if you want.
__________________
Brian
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