distributer question
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
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From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
distributer question
What limits the centrifugal weight travel?
It seems to me that if you want 12 degrees of initial timing and then another 24 degrees of advance there has to be a stop of some kind.
What happens if you need 14 degrees of initial and 32 degrees total?
It seems to me that if you want 12 degrees of initial timing and then another 24 degrees of advance there has to be a stop of some kind.
What happens if you need 14 degrees of initial and 32 degrees total?
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
On a stock dist there is a pin that fits into a groove. Tough to explain but the pin is only allowed to move so much by how long the groove is. Some different plates had longer grooves or slots is a better term.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Pull the rotor off your distributor, remove the two springs you see under the rotor, then lift the two "arms" off the advance plate and you'll see them and everything else that will make it perfectly clear.
Pro
Joined: Mar 2004
Posts: 584
Likes: 0
From: Okemos MI
I have an aftermarket HEI off ebay. I can only get 10 degrees of mech advance (I should get 20 degrees) no mater what springs I use.
With light springs I get the advance quicker but no more.
can I adjust or mod this "slot" to gain the rest?
Thanks
With light springs I get the advance quicker but no more.
can I adjust or mod this "slot" to gain the rest?
Thanks
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
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Le Mans Master
Joined: Mar 2004
Posts: 7,473
Likes: 1,495
From: Little Rock AR
The old school '74 and older points style distributors use a pin that travels in a slot. The autocam is weded to the end of the distributor shaft so it is not removable. You can add bushings to the pin or modify the length of the slot to get the right amount of centrifugal advance you want.
The 75 and up HEI centrifugal mechanisim works a little bit differently. The autocam where the weights slide against is removable. You will need to replace the weights and the autocam plate in order to get more centrifugal advance if your stocker does not have enough mechanical advance. Not all kits work right. The one I used was from Pertronix and it works pretty well. It is a drop-in that has something like 21 or 23 degrees designed into it (I forget the exact amount) so you can run more initial timing. I like the recurve part of the kit but I am not sure how you get one without buying the whole HEI upgrade package. Maybe someone else manufactures it for them?
-Mark.
The 75 and up HEI centrifugal mechanisim works a little bit differently. The autocam where the weights slide against is removable. You will need to replace the weights and the autocam plate in order to get more centrifugal advance if your stocker does not have enough mechanical advance. Not all kits work right. The one I used was from Pertronix and it works pretty well. It is a drop-in that has something like 21 or 23 degrees designed into it (I forget the exact amount) so you can run more initial timing. I like the recurve part of the kit but I am not sure how you get one without buying the whole HEI upgrade package. Maybe someone else manufactures it for them?
-Mark.
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
The old school '74 and older points style distributors use a pin that travels in a slot. The autocam is weded to the end of the distributor shaft so it is not removable. You can add bushings to the pin or modify the length of the slot to get the right amount of centrifugal advance you want.
-Mark.
Can you clarify?
Never mind. I just re-read your post... the cam is welded.... yes... not the bushing... my bad.
Duh.