Technical Tips > Engines - Carbies - Exhausts - Dissys

MSD dizzy mech. advance timing

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bfit:

--- Quote from: Darylle on May 04, 2018, 08:50:54 PM ---Hi all
I have recently replaced my engine with a 383 from engine master and all is great except my new MSD dizzy has too much mechanical advance (around 40 deg total) and I have been told that I need to "modify" the flyweights to reduce their "throw" has any one had similar issues and what measures were taken to rectify?
Thanks in advance.

--- End quote ---

 Darylle  why do you think the engine is running to much  advance.

Vettech:
You may like to look at ebay for.

MSD 8428 DISTRIBUTOR ADVANCE ADJUSTABLE SPRINGS WEIGHTS GM HEI KIT.

Comes up with a pic common to a few adds.

Shows centre lobe, two centrafugal wrights, 4 plastic colour coded bushes and three (3) sets of colour coded springs.

Regards.

bfit:
Darylle says he has a MSD  distributor  that kit will not do the job.
Most of these  commercial mass produced 383`s come with a set up with 20 to 22 deg`s advance in the distributor  all in by around 4000 rpm .
It’s not logical for then to build engines that run close to the extremes for road use.

Darylle:
Hi again
Thank you for the replies, so the ebay kit has the coloured "bushes" which I gather restrict the "throw" of the weights thus reducing the total advance.
Would I be correct?

Vettech:
I'd say fairly close, plus the springs are colour coded to their strength.

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