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By MoonShadow - 8 Years Ago
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I have a Mallory that seems to have a vacuum advance. I've never seen this before does anyone know anything about them?
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By 57RancheroJim - 8 Years Ago
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Thats interesting, don't know anything about it. The Mallory I had back in the late 60's didn't have one.
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By NoShortcuts - 8 Years Ago
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Chuck. Same experience as Jim. The Mallory I've got and the ones I've seen had full centrifugal advance only. 
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By Cliff - 8 Years Ago
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Hi, the street models had vacuum advance, they were 4 lobe (best) or 8 lobe, it will need to be setup on a machine to get the right curve.
Cliff
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By miker - 8 Years Ago
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Back in the late 60's I had what I remember as a Mallory dual point conversion in the 57 tach drive dizzy. Had two sets of overlapping points, to give more dwell with less movement. Not a 4 lobe unit like a real dual point. It had a small vacumn switch that bolted on next to the condenser and wired thu one set of points. That fired the spark when the first (or second) set of points closed and gave some vacumn controlled advance. I didn't use it, but I've still got the switch.
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By MoonShadow - 8 Years Ago
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Seems like a lot of us have never seen a street version of the Mallory. I'm going to open the distributor up tomorrow and see exactly what it is. Real curious now.
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By MoonShadow - 8 Years Ago
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Opened the distributor today and found that it apparently does have a vacuum advance or advance limiter on it. But I'm not sure how it works. Has a piece that appears to rub against the advance plate until vacuum is applied. Pics attached. The round piston rides against the advance plate with the spring behind. There is a gasket on the endplate and a ported nipple to connect the vacuum hose. New one on me.
  
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By 57RancheroJim - 8 Years Ago
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Cool! Thanks for sharing that.
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By Kahuna - 8 Years Ago
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Looks like a vacuum brake mechanism, similar to the type used on earlier Flatheads.
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By Shaggy - 8 Years Ago
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I'm kind of an ignition nut so i have probably 25 mallorys. I have a few of those but ive never taken one apart. Neat stuff. I'll have to throw one on something and see how it does.
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