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vacuum advance SPRING
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lonesome mopar
Posted 2019-09-05 6:36 AM (#587086)
Subject: vacuum advance SPRING



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Location: Milano, Italy

I did serch the forum on this subject but I couldn't find anything.

As a matter of fact the spring inside the vacuum advance canister is what decides the degrres of vacuum advance and when that is applied.

I have a feeling that the spring size and strenght are relevant to the kind of engine, expecially to the compression ratio,  the camshaft and kind of carburetor.

It happens that on my 58 Belvie I have the "Super Pak option" which is a 250 camshaft ( I guess), 9,25:1 pistons, a dual exaust system and a AFB Carter a four barrrel carb.

This configuration I have,  demandes a strong vacuum spring but to my bad luck I have lost the stock one I had.

All vacuum canister on sale on Ebay are set without the spring.

Does anybody on this forum has the same engine with the "Super Pak" option and could tell me  the spring diameter and lenght  and, most important,  its strenght ?

If I knew those values, I could ask some specialized shop down here to build a similar one,

Checking at summit racing their canister for SB mopar, they seems to give a max of 5-7 degrees of crank advance, while on the arm of my stock advance module it is written 13, which are the required degrees of advance.

The best solution for me willl be to build a copy of the stock advance spring.....

Thanks for any help ......

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wizard
Posted 2019-09-05 8:06 AM (#587087 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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If you have the vacuum pot with a threaded fitting for the vacuum hose, then you could take whatever spring from a simular vacuum pot. The vacuum advance can then be modified with spacer washers that makes the spring stronger.
This is how the factory tuned the vacuum advance….
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lonesome mopar
Posted 2019-09-06 1:18 PM (#587159 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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Location: Milano, Italy
Wizard... you left me astonished.

Ok, I will try that.

THanks for the hint.
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lonesome mopar
Posted 2019-09-06 1:25 PM (#587160 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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Posts: 379
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Location: Milano, Italy
then again....
where di I find a stock spring for a stock vacuum canister?
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wizard
Posted 2019-09-06 1:44 PM (#587162 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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Try Big M John Fowlie
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mstrug
Posted 2019-09-06 4:53 PM (#587169 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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318? https://www.ebay.com/itm/NOS-Mopar-57-58-Fury-w-318-57-Adventurer-Di...
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mstrug
Posted 2019-09-06 4:54 PM (#587170 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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350... https://www.ebay.com/itm/59-63-CHRYSLER-58-63-DODGE-D500-58-60-PLYMO...
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mstrug
Posted 2019-09-06 4:55 PM (#587171 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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maybe... https://www.ebay.com/itm/NOS-1957-58-59-60-Dodge-Chrysler-DeSoto-Ply...
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mstrug
Posted 2019-09-06 4:57 PM (#587172 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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All models... https://www.ebay.com/itm/NOS-VACUUM-ADVANCE-1957-1958-1959-1960-1961...
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mstrug
Posted 2019-09-06 4:58 PM (#587173 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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Another... https://www.ebay.com/itm/VACUUM-ADVANCE-1957-CHRYSLER-SARATOGA-1959-...
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mstrug
Posted 2019-09-06 5:01 PM (#587174 - in reply to #587086)
Subject: Re: vacuum advance SPRING



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Dodge power pack; https://www.ebay.com/itm/NOS-Vacuum-Advance-V-139-1957-1958-1959-196...
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