Dual Vaccum Dizzy
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Senior User
Joined: Mar 2008
Posts: 171
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From: Idaho
Dual Vaccum Dizzy
I'm cleaning out the garage, ridding my self of the old engine, and found what looks like a dual vaccum dizzy. I believe this is what the 390 had on it before. are there any advantages to the dual vaccum dizzy? Would it be work rebuilding, or should i just junk it?
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
This whole dual vac dizzy thing has been on the plate somewhat often right here lately. From reading the posts, is it my imagination or ? Is the main purpose for this style dizzy to coverup the fact that the ported setup was causing overheating issues ? And as a resolution to a simple problem they created a band aid part with extra gizmos to go wrong and require yet more$ to replace/fix. ???????????? Inquiring minds want to know.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
This whole dual vac dizzy thing has been on the plate somewhat often right here lately. From reading the posts, is it my imagination or ? Is the main purpose for this style dizzy to coverup the fact that the ported setup was causing overheating issues ? And as a resolution to a simple problem they created a band aid part with extra gizmos to go wrong and require yet more$ to replace/fix. ???????????? Inquiring minds want to know.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Different deal all together. My 1984 F250 with a 460 has what you are talking about. Single advance unit with ported vacuum and manifold vacuum to the thermo switch. Normally the ported vacuum runs the advance, but if the engine temp gets above a certain temp, IIRC 210° or 220°, the switch changes the input to manifold vacuum, there by advancing the timing and increasing idle speed to cool the motor down. Only works when you are stuck in traffic or idling a lot in hot weather. No dual diaphragm involved.
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
ahh!! hmm gets me to thinking as mine heats up while idling. Either a similar part adapted or a manual means of the same thing "That would require me paying attention though" LMAO!
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Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Either put a "T" where the temp sensor is or find one of the thermostst housings that has the threaded hole for the sensor.
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