MSD mech advance spring combo?
Race Director
Joined: Mar 2016
Posts: 14,325
Likes: 8,128
From: Napa Valley California
The speed shop I'm working with said that the MSD's seem to work best using one silver and one blue spring on the mechancial advance.
But that is for my BB, not sure what you are running.
But that is for my BB, not sure what you are running.
Race Director
Joined: Mar 2016
Posts: 14,325
Likes: 8,128
From: Napa Valley California
They said to double check the setup instructions included in the box.
Racer
Joined: Jan 2008
Posts: 291
Likes: 15
From: Virginia Beach VA
The MSD distributor instructions include graphical depictions of the mechanical advance curves (advance vs RPM) for the various spring combinations.
Last edited by A8skyhawk; Jun 30, 2018 at 11:05 AM.
Team Owner
Joined: Jun 2001
Posts: 23,367
Likes: 1,061
From: Virginia USA
Here are the MSD spring values. I just happen to have my distributor instruction right next to my computer:
Heavy Silver
Light Blue
Light Silver
According to the instructions here are the possible curves:
2 heavy silver - slowest
1 heavy silver 1 light blue - next slowest
1 heavy silver 1 light silver - a little faster than above
2 light blues - getting a little faster
1 light silver 1 light blue - faster
2 light silver - fastest
Also the MSD stop bushing size and amount of advance they give:
Red - Smallest - 28 degree
Silver - 25 degree
Blue - 21 degree
Black - Largest - 18 degree
Hope this helps. If needed I can scan and post the curve charts for each combo. Just let me know.
Heavy Silver
Light Blue
Light Silver
According to the instructions here are the possible curves:
2 heavy silver - slowest
1 heavy silver 1 light blue - next slowest
1 heavy silver 1 light silver - a little faster than above
2 light blues - getting a little faster
1 light silver 1 light blue - faster
2 light silver - fastest
Also the MSD stop bushing size and amount of advance they give:
Red - Smallest - 28 degree
Silver - 25 degree
Blue - 21 degree
Black - Largest - 18 degree
Hope this helps. If needed I can scan and post the curve charts for each combo. Just let me know.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Four out of five dentist recommend: 1 light-blue spring, 1-light-silver spring.
Keep in mind those color coded stop bushings will only fit the MSD Billet unit and not the Streetfire for some reason.
Keep in mind those color coded stop bushings will only fit the MSD Billet unit and not the Streetfire for some reason.
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