Nope. Pertronix uses a totally different kind of trigger than the factory Mopar EI unit.

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Casually looking for a Clifford hyperpak intake for cheap.

Interesting thread. There is much to be gleaned here. One little tidbit.

Chrysler's approach to cutting down emissions early on in their engineering process (70's) was to retard timing at idle, so they could open the throttle blades a bit more and still keep the idle RPM's down. This required a longer throw on the centrifugal and vacuum advance to maintain good cruise advance.

If you are concerned about such things, then start out with lower initial and add your advance in by the longer throw vacuum pod, and centrifugal slots.
The more closed the throttle blades are at idle, the less efficient the combustion is.

Your engine will idle cleaner.

Sam

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The VC-93 advance can arrived today. The arm is stamped 6.5X. I will try that first and see how it goes.

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Casually looking for a Clifford hyperpak intake for cheap.

Reed,
Cool, that sounds like a good one to try for a van. Let us know how it goes...

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Reed? is that an adjustable pod, or not?
i was at the parts store a couple days ago and the catalog pic showed the VC-93 as a non-adjustable.

Don't know. I haven't had a chance to stick my allen wrench in the hole and probe around. I'll report back on the adjustability of it when I get a chance to play with it.

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Casually looking for a Clifford hyperpak intake for cheap.

If the end of the can is a big hex, it's adjustable.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

UPDATE:

VC93- starts advancing at 6 inches of vacuum, done moving by 11 inches, and it is NOT adjustable. Repeat, NOT ADJUSTABLE.

However, if you are tuning a heavy vehicle or a vehicle pulling a heavy load, I think this is about where you want the vacuum advance to be any way. The arm is stamped 6.5X, so it only provides 13 degrees of advance.

My current idea for a truck motor distributor curve:

15R governor, 16 degrees base timing, heavy spring with long loop + medium light spring, 13 degrees vacuum advance provided starting at 11 inches.

I want to achieve 28 degrees of total advance (base +mechanical) by 2600 RPM, that would give me 41 degrees of vacuum + mechanical advance at light throttle, cruising on the highway at 2700 RPM. This means I need to get a medium-light spring that will give me 12 degrees of advance at 2600 RPM. That might have to be a heavy spring.

I'll map it out once I get my hands on my brother's van again.

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Casually looking for a Clifford hyperpak intake for cheap.

today i strolled into a local NAPA to order a couple vacuum pods.
boy did i get a rude awakening.i had hoped to get 2. 1 VC-173, and 1 VC-239. also i was gonna get a couple of distributor drive gears. that way i could get my Pertronix back in and have a complete Points dizzy as a spare.
i was told the only one available is the stock, VC-93. all other models are on back order, with no ETA. he did find one dizzy drive gear in his network,, but only one.

anybody able to recommend a different source for thes adjustable pods?

D~~~!

www.rockauto.com Do a Standard Parts brand part number search for VC173 or VC239 etc...

Don't forget the 5% discount code in the Slanted Network section

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Casually looking for a Clifford hyperpak intake for cheap.

thx Reed. it was cheaper than NAPA too. i hope it works out better than some of the stories i've heard about Rock Auto.

D~~~!

Care to elaborate? I have only hade one problem with rock auto. Ordered some GM 4 pin HEI modules, and they never arrived. Post office said they were never shipped, Rock Auto said they were.
Told Rock to work it out with the Post Office, I never received them. They refuneded my money no problem.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Reed, you can lengthen the slot in the vacuum pod advance arm with a dremel tool and a fine cut off disk. YOu could make several different ones and try them and see which one worked best. The magic number of 52 total as stated earlier in this thread is interesting. I had never seen that figure posted or printed before. I intend to try number in the cruise range of the ignition map of the EFI if I ever get it to work.

I would like to say that getting the advance curve right is one of the more important aspects of engine building that is often overlooked as it is rather difficult to change in the old distributor curve. But, it is worth playing with for sure. To know for sure you have it right though, you would have to put it on a dyno and see if it got better one way or the other.

With EFI they put the rear wheels on a steady state dyno and watch HP as the tweak the advance. They keep advancing it until the hp and torgue drop off and then back it off a bit. This was essentially what the earlier member did when he found the magic number of 52 advance in cruise. He kept going up until it got worse.
Sam

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I wonder if cam choice changes this magical 52 degrees number. If cam is installed a degree or two retarded or advanced from optimal, would this change that 52 degree sweet spot?

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Sam- could you elaborate on how I change the slot in the vacuum can arm? I can see no slot and no way to disassemble the vacuum can without destroying it.

I don't know about the 52 degrees either. I have heard numerous knowledgeable people say the slant likes 32 degrees of mechanical plus base advance total, and the rest is just gravy from the vacuum pod. Since this van is a hauler, I'm going to be a bit conservative in the total advance to avoid over-advancing the timing and bogging the motor down.

I know that right now the van does OK and it has essentially a non-functioning vacuum advance.

P.S. I have also had nothing but good experiences with RockAuto.

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Casually looking for a Clifford hyperpak intake for cheap.