musclemustang8

i have a MSD pro billet distributor
anyone have any problems with there distributor changing its mind on the advance, the springs are not stretched and everythig is in good shape (so it seems)
one second it idles fine and then after giving it throttle and letting off, it doesnt come all the way off advance.
for example (this is just an example i am not saying this is exactly what it does b\c its a lil different every time)
idle @ 1000rpms its initial timing is 6 deg
throttle to 3000rpms its full advance at 30 deg
let off throttle and idles high at say... 1300rpms @ 15deg
why isnt it dropping all the way back down to 1000rpms @6deg?
its not a fuel issue so its not a carb deal, its defintly a distributor problem, why is there lag in the dist. little extra play in the gear maybe, it plays some i dont know if it is enough to make that problem. its a new gear but maybe there is a defect, i have never encountered this problme before.
any constructive ideas?

351cid

i used to have the same problem with my first MSD dissy.

i had to keep it lubed up with silicon spray or similer , that seemed to fix it .

it was like that from nearly new till in the end the plastic looking wear buttons in the floor of the dissy started to breakup after about 12 years.

i had to buy a new dissy because they dont sell the buttons seperately.

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`75 XB FAIRMONT SEDAN injected 351, toplaoder, disc brake 9", factory paint+ vinyl roof.
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Racer

For a start you are not running enough timing. 6/30 degrees is way to little for old open chamber cast heads.

musclemustang8

yeah i know i am not runing enough timing as of yet, i #1 am running nitrous and second i havent got everything worked out til i can test it yet, its just a safe baseline. but just for your experience sake, what kind of timing advance should i be looking at, estimation of course. -thanks ryan

Racer

I would run 15 plus initial, and in regards to total timing, i have no experience with open chamber heads. I would wait for one of the other O/C Clevo guys to chime in. I would guess around 38 degrees plus.

brenx

Not with n2o. Whats the math on that? 2 deg retard for every 50 or 100hp?

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XB Fairmont (street car) 11.07@123.02mph.

crochunter

38 degrees plus. What a joke. I thought you knew something.

musclemustang8

well with my oc 2v heads i used to run about 40 deg. total and never had a problem but i didnt know if i was goin to run into detonation problems

TruBlu351

Sure its not your throttler return spring not fully shutting the throttle plates? Little sticky?

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musclemustang8

[QUOTE=musclemustang8]well with my oc 2v heads i used to run about 40 deg. total and never had a problem but i didnt know if i was goin to run into detonation problems. but the 2v set up was very...different, the timing marks never made much sense, there was something throwing the marks off, it wouldnt run at all unless the marks read like 26 initial and past 40 total. but that was in the past. the new set up , cam, chain, gears etc allows the markes to read true.
revised******