MSD spring and bushing combination
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MSD spring and bushing combination
I am curious as too the spring and bushing combo people are using on there MSD Distributors?
Background: I have mild FE390 with 750 cfm carb, headers, 9:1 compression, Auto C-6 with 3.25 rear gears and 2500 convertor. Cam is 214/ 224 at .50. with Adv. Duration of 292/302.
Currently I am running the Silver (heavy) and Silver (light) springs with the blue bushings. Initial timing is 18 degrees. Instructions say that this combo has full advance occuring at about 3300 RPM.
Thanks
Background: I have mild FE390 with 750 cfm carb, headers, 9:1 compression, Auto C-6 with 3.25 rear gears and 2500 convertor. Cam is 214/ 224 at .50. with Adv. Duration of 292/302.
Currently I am running the Silver (heavy) and Silver (light) springs with the blue bushings. Initial timing is 18 degrees. Instructions say that this combo has full advance occuring at about 3300 RPM.
Thanks
Posting Guru
Joined: Jul 2003
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From: Colville, Washington
I do not have a MSD dist, but 18 deg initial is an awful lot. I would lighten up the springs for sooner mech advance. It should start to advance at around 1400-1500 RPM and smoothly advance.
Lead Driver
Joined: Apr 2001
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From: Texas
I'll get back soon (probably this evening), I'm going to do some more checking and tuning on the FE446 I just built. I'm running the MSD dizzy, but can't recall what spring combination. I know I wanted a rapid ramp from a high initial advance and enough stop bushing to keep it under control at higher RPMS.
Lead Driver
Joined: Apr 2001
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From: Texas
I'm running the 2 light silver springs for the earliest ramp and the silver stop bushing for +25 degrees at all out. I need to bring that down with the new cam, as best I can tell. It really likes a high inital advance.
I'll probbaly start another thread about initial and total advance, since mine seems to be off the chart.
I'll probbaly start another thread about initial and total advance, since mine seems to be off the chart.
Posting Guru
Joined: Jul 2003
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From: Colville, Washington
One thing- is the MSD all mechanical advance or mech. and vacuum? It makes a difference on the initial and speed of the mech. advance. If you have vacuum advance, less mech. is needed especially at light throttle use.
Lead Driver
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From: Texas
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Gtex,
You are right about the initial advance. As I stated earlier I am close to 20 degrees. It seems to run worse at 15 degrees of initial advance. No Vacuum on my MSD either. Where did you end up at with your initial adv?
You are right about the initial advance. As I stated earlier I am close to 20 degrees. It seems to run worse at 15 degrees of initial advance. No Vacuum on my MSD either. Where did you end up at with your initial adv?
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Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
The FE446 I'm tuning right ow, likes a lot of initial advance. I'm going to change to a bigger stop bushing to keep the higher RPM advance down. It's ahppy clear up past 30 BTDC on startup. Matter of fact, it won't hardly start if below the 20s?? I'm still confused, more tuning and testing needed.
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Gtex.
I just got off the phone with MSD. They said that if you are running and complete MSD set-up your initial will be over 20 degrees. They said the timing system of the duraspark and MSD are different and thus require different initail advance. 12 degrees on a duraspark could mean 22 degrees on a MSD box. Also, for more low-end torque they recommeded a higher initial timing (as much as it will take w/o pinging or pre-det.) and the lighter spring combination if you are staying at lower RPMS. If you are going over 4-5,000 RPMS on a frequent basis, use a heavier spring combo..
I just got off the phone with MSD. They said that if you are running and complete MSD set-up your initial will be over 20 degrees. They said the timing system of the duraspark and MSD are different and thus require different initail advance. 12 degrees on a duraspark could mean 22 degrees on a MSD box. Also, for more low-end torque they recommeded a higher initial timing (as much as it will take w/o pinging or pre-det.) and the lighter spring combination if you are staying at lower RPMS. If you are going over 4-5,000 RPMS on a frequent basis, use a heavier spring combo..
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