NEW Stromberg electronic dizzy

[Ol' Ron]

There are many ignition systems that have no vacuum component in their advance curve, and the engines run just fine. However, for a street engine that spends 90% of it time in cruise, the vacuum advance is very critical when it comes to power. It's part of the tuning process to retard the spark under power when a richer mixture is introduced into the engine. In cruise the lean mixture need more advance, thus the vacuum advance. All modern ignition systems from the early 30's have it. Most racing ignition systems don't need it.

[3Dueces]

British made ,eh? "Prince of Darkness" comes to mind...Just kidding! I suppose only carbon core wires have to be run...No copper,right?

[Tim Ayers]

Can this unit run using a generator or do you need run an alternator?

I thought I've read somewhere that these (previous ones) don't like the spikes and dips that can come from using a generator.

[ford nut]

I've looked for these on google and can't seem to find them, is there a better word to use other than "Stromberg distributor"?

[JM 35 Sedan]

Originally Posted by ford nut

I've looked for these on google and can't seem to find them, is there a better word to use other than "Stromberg distributor"?

This is all I can find on Google, which has been posted previously. You may want to contact Uncle Max.

https://www.oneillvintageford.co.uk/...stributor.html

[ford nut]

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Originally Posted by uncle max

My Maytag days provided some great training!

can you get these uncle max? I think I want to try one. thank you, kurt. (depending on cost)

[V8 Bob]

Originally Posted by weemark

Ron the Lucas dizzy I have doesn't have vacuum advance either. The Lucas unit is LV6/MT8 with a part no. of 411052.

The early distributors had a vacuum retard, not advance, correct?

[Ol' Ron]

Yes, the early distributor did have a vacuum retard. Which in affect does the same thing.

[tubman]

It's all a matter of terminology. But think about how it works. When there is high vacuum in the system, the piston is pulled back inside the distributor allowing the centrifugal advance to work advancing the spark. More vacuum, more advance. What do you call that?

[flatjack9]

The problem is, you can not exceed the centrifugal advance and at part throttle more advance is needed for efficient running, hence distributors with vacuum advance.

[V8 Bob]

Originally Posted by tubman

It's all a matter of terminology. But think about how it works. When there is high vacuum in the system, the piston is pulled back inside the distributor allowing the centrifugal advance to work advancing the spark. More vacuum, more advance. What do you call that?

Vacuum retard. Total distributor advance stays the same, around 24 degrees, or whatever you set it to. The first actual vacuum advance, in addition to mechanical/centrifugal, was introduced in '57 for Fords.
The vacuum retard was needed in the days of poor quality gas, not so much today.

[tubman]

See? Terminology! The increase in vacuum doesn't increase the amount of advance, because, as you point out, it can't. It does however reduce the amount the centrifugal advance is retarded by the vacuum brake by pulling the brake piston away from the centrifugal advance disk inside the distributor. If you reduce the amount the timing is retarded, it is more advanced than it would normally be. You say tomato and I say tomatoe. Would you agree that by adding vacuum at a certain RPM with one of these things, the actual timing of the spark is advanced (by being retarded less)? I believe the term "vacuum advance" more clearly describes what is going on. Maybe we should call what happens "vacuum anti-retard" or perhaps "vacuum non-retard". In my opinion, "vacuum retard" is the least correct description of what is actually happening with the timing of the spark.

Bob, I'm starting to enjoy these discusions with you; they always make me think harder than I normally do.

[JSeery]

I have an idea, how about a vacuum brake? Because that's what it is.

[tubman]

Not really, because vacuum releases the brake. It would be correct it vacuum applied the brake.

"Vacuum Brake" has been in common use since the inception of these things and, as such, has become the accepted colloquial term. Just like a few aficionados use engine oil in their cars, while most people just use motor oil.

[JSeery]

Believe it is the change in vacuum (actually pressure change) that applies the brake and removes the brake. The brake is operated by a change in vacuum (pressure difference) and thus it is a vacuum operated brake, or vacuum brake.

[BUBBAS IGNITION]

Or we could use the actual Ford ad???????

[JSeery]

I see the term "retards" ignition timing.

[JSeery]

The Ford rebuild guide uses the term Vacuum Brake.

[Lawrie]

Either way ,it works a treat,
Lawrie

[uncle max]

These are ready to ship...

21A-12 two bolt 12v neg
21A-6 two bolt 6v pos

11A-12 three bolt 12v neg
11A-6 three bolt 6v pos

All the same price: $375 retail

Originally Posted by ford nut

can you get these uncle max? I think I want to try one. thank you, kurt. (depending on cost)