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  #16 (permalink)  
Old 07-25-2011, 01:41 PM
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Minor adjustment of the amount of mechanical adv travel limit is done by grinding a flat on the side of the screw head so the mechanism can more a bit more.

The hole is already there. Just get a suitable machine screw.

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Old 07-25-2011, 03:18 PM
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How's it going F-Bird the hole your pic shows isn't there on the MSD 8361. There is a hole that the rotor doesn't use but at full advance only half of the hole shows, at stationary position its completely under the weight plate. You can't even get to it to tap it. I guess I could pull the distributor and drill and tap it on the bench. Thanks for your help.
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Old 07-25-2011, 04:15 PM
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Ya I missed the fact that its a MSD distributor, not the HEI style.

Your MSD is a bit different.

Post some pics of the drilled and screwed rotor plate, when you get 'er done.

May have to clearance the underside of the rotor, with the limiting screw in
there.

Another way to limit the advance travel is to stick something in the end of the advance pin slot, that won't fall out or interfere with the advance pin/bushing motion. Or tear it down and weld the end of the slot to restrict the motion of the advance mechanism.

Or create a custom oblong shaped advance bushing that fits the slot and does not bind in the slot.


Most "stock" out of the box distributors have 20 to 22deg of mechanical advance travel. You want to cut that in half (approx). (10-12deg)

to allow you to run the increased base initial idle timing.
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Old 07-25-2011, 04:28 PM
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Would the back half of the oblong bushing have to be the same number of thousands that I decide to make the front thats going to be the stop side? You know like the supplied bushings are round so there the same dia. at the back of the slot as they are at the front. I hope you know what I'm trying to ask I don't know of any other way to describe it it.
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Old 07-25-2011, 04:53 PM
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Quote:
Originally Posted by 41pu
Would the back half of the oblong bushing have to be the same number of thousands that I decide to make the front thats going to be the stop side? You know like the supplied bushings are round so there the same dia. at the back of the slot as they are at the front. I hope you know what I'm trying to ask I don't know of any other way to describe it it.
Ya the oblong bushing still has to slide in the slot.

If it spins on the pin it will bind in the slot.

A possible solution for this distributor is to weld a tab onto a spare MSD advance weight to restrict its motion. Then the tail of the advance weight becomes the method of travel restriction instead of the pin in the slot.

Can you find or create something to stick in the end of the advance stop slot? (U shaped bent sheetmetal " clip" or)
As long as it stays put and does not fall out or jamb up the advance system.
Not a lot of room for extra screws on the advance plate on this distributor.

Unfortunalty the available advance bushings only allow you to restrict the travel to 18deg.

The last one I did like this ( Not a HEI ) I tore it all down and welded up and reground the end of the advance pin slot.
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Last edited by F-BIRD'88; 07-25-2011 at 04:59 PM.
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Old 07-25-2011, 07:09 PM
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Thanks F-Bird, I think I'll go with a spot of weld on the tail that'll be easier to fine tune then taking the bushing in and out to get the right advance. Ya got guess of how much to add?
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Old 07-25-2011, 07:14 PM
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Aother way to skin this cat.

Make up another washer with tab (made out of sheet metal) to add between the bushing, lock washer and nut.

The tab has to be oriented and locked so it does not jam in the slot.
The tab must be shaped so it does not stick up past the slot and interfere with the rotation of the advance weights above.

The length of the arm of the tab determines the amount of mechanical advance travel.
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Old 07-25-2011, 07:19 PM
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Quote:
Originally Posted by 41pu
Thanks F-Bird, I think I'll go with a spot of weld on the tail that'll be easier to fine tune then taking the bushing in and out to get the right advance. Ya got guess of how much to add?
Well if you take the rotor off and look at the weights and work the mechanism you want to reduce the travel by about half.

Grind and reshape as required till you get it right.
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Old 07-25-2011, 07:33 PM
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That would work also, but I like your spot of weld on the tail. The nut on the bushing pin is a pain to get started, I think it would be quicker to pop the springs and grind or add a little metal than to start that nut. I think I can figure out how much to add by moving the weights out by hand with the 18 bushing in and seeing where the weights end up, measure the distance between the tail and the plate and just add enough to take a little travel away.
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Old 07-25-2011, 08:12 PM
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Post how you make out and how you did it so others can see and learn.

The HEI distributor is a lot easier to mod.
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Old 07-25-2011, 08:52 PM
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Got ya F-Bird, I'll take pics and measurements and get back to you when I get to 10 to 12 mech, it might take a couple days. Take care thanks
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  #27 (permalink)  
Old 07-25-2011, 09:08 PM
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Beauuut-ee lil truck.
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Old 07-26-2011, 06:05 PM
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F-Bird, I decided to try the oblong bushing today, after 4hrs of making the bushing and checking the advance I discovered the slot in the plate is not oblong. The supposable oblong hole is stamped into the plate on the inside circumference leaving the hole open on the inside dia. then the plate is welded to the shaft making the center of the slot on the inside convex in the center of the length, now my oblong bushing wants to rock on the convex and bind. I made my bushing the same OD as the 18 degree bushing which gives it a couple thousands clearance on each side and the length .460 just around .010 under the length of the slot. As I worked my way down .010 at a time it started to bind at.420 that's when I discovered the slot problem. The ideal would work if it was a true oblong hole. Kinda hard to explain. Tomorrow is another day I'll start welding on the tails.
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Old 07-26-2011, 09:19 PM
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Why not just heat up the tail of the weight and bend it inward towards the stop?



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Old 07-27-2011, 04:29 AM
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Thats a good thought, but look at what I found last night. Check this site! http://www.4secondsflat.com/MSD%20Di...r%20Tuning.htm
I'm going to call them.
F-Bird--- What do you think?

Last edited by 41pu; 07-27-2011 at 04:45 AM.
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