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Re: recurving a stock distributor [Re: 440newport] #627306
03/02/10 10:10 AM
03/02/10 10:10 AM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
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Posts: 16,122
Grand Haven, MI
Quote:

Quote:

standard motor products VC184 is a 17 degree vaccuum advance module. that's the shortest vac. advance canister I've seen for the electronic ignition dizzies...




I've been looking at vac advance cans for the last little while. I can't see anything for a big block that's less than 18. The VC184 you mention has the arm the opposite way, like for a slant or SB. They actually have a 13 degree can for a SB or slant, VC173.




VC184 is for a small block dizzy....

wish I woulda known about the VC173 before I bought mine...of course, my mag heads don't like a lot of timing at WOT (32 seems to work best), so the 17 degree can is about right for me.


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
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Re: recurving a stock distributor [Re: patrick] #627307
03/04/10 06:34 PM
03/04/10 06:34 PM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline OP
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440newport  Offline OP
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St. John's Newfoundland
Ok I measured the slot with digital calipers and came up with 0.480. It's a 17 degree plate so I get 0.01411" per degree. I was gonna make it advance 20 degrees so that means I need to take 14 at 0.197 off leaving 0.283 which doesn't seem like a lot, the weights are barely going to move in that space but I guess its right?

Re: recurving a stock distributor [Re: 440newport] #627308
03/04/10 06:59 PM
03/04/10 06:59 PM
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
Mattax Offline
top fuel
Mattax  Offline
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Phila. Pa.
Quote:

Ok I measured the slot with digital calipers and came up with 0.480. It's a 17 degree plate so I get 0.01411" per degree. I was gonna make it advance 20 degrees so that means I need to take 14 at 0.197 off leaving 0.283 which doesn't seem like a lot, the weights are barely going to move in that space but I guess its right?




It is not right. You also need to measure the pin that sticks out of the top of the weight. See the * in my previous post.

Re: recurving a stock distributor [Re: Mattax] #627309
03/04/10 07:27 PM
03/04/10 07:27 PM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline OP
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440newport  Offline OP
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St. John's Newfoundland
Quote:



It is not right. You also need to measure the pin that sticks out of the top of the weight. See the * in my previous post.




Doh! Yes that makes perfect sense. Ok I come with .380 now which seems more like it.

Re: recurving a stock distributor [Re: 440newport] #627310
03/04/10 07:57 PM
03/04/10 07:57 PM
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT Offline
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Today? Who Knows?
What I do is not worry about total advance at first, instead with the engine warmed up I start adding timing to see what the engine will take without the starter kicking back.. The more initial timing you can give it the better it will launch... Your not looking to rev the engine above 3000 rpm here just see what the starter will take & see how the car comes out of the hole... So now you know how much initial lead you want & you just need to limit the total to around 34-36 degrees

This chart may help...

Modifying advance slots
degrees / slot size
6.............. .340
7................355
8................375
9................390
10...............405
11.5 ...........420
12...............435
13...............445
14...............460
15...............475
16...............490
17...............505
18...............520

Re: recurving a stock distributor [Re: 1_WILD_RT] #627311
03/04/10 08:49 PM
03/04/10 08:49 PM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline OP
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St. John's Newfoundland
I went with .375. I'll try that until I get the car running, if it needs to be changed it's no big deal to do it over.

Thanks everybody for the help.

5845731-P1000128.JPG (401 downloads)
Re: recurving a stock distributor [Re: 440newport] #627312
03/04/10 08:50 PM
03/04/10 08:50 PM
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT Offline
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1_WILD_RT  Offline
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Posts: 27,347
Today? Who Knows?
Should put you real close...

Re: recurving a stock distributor [Re: 1_WILD_RT] #627313
03/07/10 08:37 PM
03/07/10 08:37 PM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline OP
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St. John's Newfoundland
One more question on this...
Before I took the dist apart I marked which way the reluctor was on the advance plate shaft, but I didn't mark which way the advance plate was on the main shaft. I believe if its 180* out the reluctor wont line up with the pick up correctly.
Is there a way to tell?

Re: recurving a stock distributor [Re: 440newport] #627314
03/07/10 11:01 PM
03/07/10 11:01 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
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Posts: 36,040
Lincoln Nebraska
Quote:

I believe if its 180* out the reluctor wont line up with the pick up correctly.
Is there a way to tell?


It'll be the same either way but I would drill a hole in the top of your (or a spare) dist cap between the center and #1 terminals & check rotor phasing so if it (Phasing) is off you can correct it but dropping the adv plate on the pins 180 off keeps the phasing the same in spite of the directional arrow and the 2 choices of roll pin slots on the reluctor wanting to convince you otherwise and be aware when you freeze the rotor w the light that vac adv (if used) will shift the rotor (phasing) CCW on a SB and CW on a BB and that mechanical advance does not change phasing.


live every 24 hour block of time like it's your last day on earth
Re: recurving a stock distributor [Re: RapidRobert] #627315
03/07/10 11:16 PM
03/07/10 11:16 PM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline OP
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St. John's Newfoundland
Quote:

dropping the adv plate on the pins 180 off keeps the phasing the same in spite of the directional arrow and the 2 choices of roll pin slots on the reluctor wanting to convince you otherwise




Ok thanks. I thought that since the reluctor can go 2 ways and the "teeth" are not lined up with the pick up the same way between the 2, I thought turning the advance plate on the pins backwards would be the same as having the reluctor on backwards.

Re: recurving a stock distributor [Re: 440newport] #627316
03/07/10 11:28 PM
03/07/10 11:28 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Posts: 36,040
Lincoln Nebraska
visualize an analog clock showing 5 minutes before 5 o'clock and if you epoxied the hands to lock the hour and the minute hand together as one then rotated the hand assy 1/2 turn (180 deg) the offset would end up being the same and if you 1st changed the roll pin hole and if this put the hands at 10 minutes in front of 4 and you locked them together as before and again swapped them 180 the top hand would still be 10 minutes away from (12)


live every 24 hour block of time like it's your last day on earth
Re: recurving a stock distributor [Re: RapidRobert] #627317
03/08/10 05:56 AM
03/08/10 05:56 AM
Joined: Jan 2003
Posts: 5,788
Hamilton, Ontario Canada
Magnum Offline
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Posts: 5,788
Hamilton, Ontario Canada
It's too bad these are big $$ and only for small blocks. I've been down that road of welding, completely dissasembling for springs and swapping cannisters. Never again.

This will be my next distributor.

http://www.summitracing.com/parts/MSD-8504/


69 Super Bee, 93 Mustang LX, 04 Allure Super
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