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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  MSD Ignition Vacuum Advance Settings ?

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Author Topic:   MSD Ignition Vacuum Advance Settings ?
Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-12-2005 08:14 PM     Click Here to See the Profile for Roadkill        Reply w/Quote
Just installed a new MSD readt to run and the engine is alot stronger sounding. What I need to do though is set the vacuum advance. The directions have given tsome ideas of spring tension to use but I was wondering if anybody has one and has already set theirs. Right now the unit came with the highest tension springs whis give the slowest advance. I also have a 302 V8 stock cam and mainfold with a 2 barrel autolit carb. Yhanks Ed

Fastymz
Moderator

Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001

posted 06-12-2005 08:16 PM     Click Here to See the Profile for Fastymz        Reply w/Quote
Ed, I don't have a MSD unit. But I know they have a chart. Use the springs that will give you total advance all in by 2500-3000rpm.

------------------
oddly obsessed with big scoops on little Mustangs

65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc.

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Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-12-2005 09:59 PM     Click Here to See the Profile for Roadkill        Reply w/Quote
quote:
Originally posted by Fastymz:
Ed, I don't have a MSD unit. But I know they have a chart. Use the springs that will give you total advance all in by 2500-3000rpm.



How much total advance would you recommend. As of now the engine timing is at 6 degrees and the cam stop in the distributor is 21 degrees, total 27. Thanks again Ed

Fastymz
Moderator

Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001

posted 06-13-2005 02:53 AM     Click Here to See the Profile for Fastymz        Reply w/Quote
Total advance around 32-36.

------------------
oddly obsessed with big scoops on little Mustangs

65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc.

My Pics

Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-13-2005 08:57 AM     Click Here to See the Profile for Roadkill        Reply w/Quote
quote:
Originally posted by Fastymz:
Total advance around 32-36.


grego37
Gearhead

Posts: 411
From: los angeles,CA,USA
Registered: May 2004

posted 06-13-2005 10:43 AM     Click Here to See the Profile for grego37        Reply w/Quote
can you give it more initial advance?

Initial timing + advance timing = Total timing.


Dont forget to re-adjust your carb when you change the timing.

buening
Gearhead

Posts: 317
From: Decatur, IL
Registered: Mar 2005

posted 06-13-2005 11:04 AM     Click Here to See the Profile for buening        Reply w/Quote
quote:
Originally posted by Roadkill:

How much total advance would you recommend. As of now the engine timing is at 6 degrees and the cam stop in the distributor is 21 degrees, total 27. Thanks again Ed

Hi, does the cam stop read 21L? If so, you are getting 42 from the dizzy alone. Here's a nice little write-up on timing and distributors. It also covers setting the vacuum advance unit. http://www.foureyedpride.com/phpBB2/viewtopic.php?t=12752

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1970 Grabber Blue Mach 1 H-code
1970 Fastback
2003 Torch Red Mustang

Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-13-2005 12:11 PM     Click Here to See the Profile for Roadkill        Reply w/Quote
quote:
Originally posted by buening:
Hi, does the cam stop read 21L? If so, you are getting 42 from the dizzy alone. Here's a nice little write-up on timing and distributors. It also covers setting the vacuum advance unit. http://www.foureyedpride.com/phpBB2/viewtopic.php?t=12752

hey thanks for the info, I just installed a MSD ready to run, the manual said that the advance stop bushing installed limits advance to 21 degrees add that to the 6 degree initial advance that is where I got total of 27 degrees. What I think I need to do is change the advance stop bushing from 21 degree to the 25 degree one then advance my initial timing to about 10 degrees. I have already changed the springs to allow total advance to be reached at about 2500 rpm. Any other suggestions would be ppreciated being new to doing these adjustments myself. Thanks Ed


grego37
Gearhead

Posts: 411
From: los angeles,CA,USA
Registered: May 2004

posted 06-13-2005 12:48 PM     Click Here to See the Profile for grego37        Reply w/Quote
on your test drive,
If it pings when you get on it = it means advance comes in too fast, adjust to next stiffer spring combo.

Is 6* initial timing a factory reccomendation? why not give it more initial and leave the 21* stop bushing?

Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-13-2005 02:07 PM     Click Here to See the Profile for Roadkill        Reply w/Quote
quote:
Originally posted by grego37:
on your test drive,
If it pings when you get on it = it means advance comes in too fast, adjust to next stiffer spring combo.

Is 6* initial timing a factory reccomendation? why not give it more initial and leave the 21* stop bushing?


Initial is factory reccomendation what i did was increase to 10 degrees initial timing and left the 21 degree stop in. The acceleration did bog mildly when jumping on it so I will try your suggestion and put the next stiffer advance springs in Thanks Ed

grego37
Gearhead

Posts: 411
From: los angeles,CA,USA
Registered: May 2004

posted 06-13-2005 03:03 PM     Click Here to See the Profile for grego37        Reply w/Quote
Did you re-adjust your carb after you changed your timing?

You want full advance to come in as soon as possible, but if it detonates (Pings)under excelleration, You're comming in too fast(springs too light) change to the next stiffer spring combo to make it come in a little slower, repeat if neccesary until detonation is gone under excelleration.

Im not sure if the same rules are applied if it bogs. That may be a carb issue if it bogs?

Fastymz
Moderator

Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001

posted 06-13-2005 03:06 PM     Click Here to See the Profile for Fastymz        Reply w/Quote
Before you test drive, take your timing light and check to total timing. Run it up to 4000rpm with 500rpm jumps at a time.

------------------
oddly obsessed with big scoops on little Mustangs

65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc.

My Pics

Roadkill
Journeyman

Posts: 80
From: Chesterfield, Mi, 48047
Registered: Jun 2005

posted 06-14-2005 02:29 PM     Click Here to See the Profile for Roadkill        Reply w/Quote
quote:
Originally posted by Fastymz:
Before you test drive, take your timing light and check to total timing. Run it up to 4000rpm with 500rpm jumps at a time.


When I hooked up the timing light ang meter to the engine initial timing is at 10 degree and distributor is at 21 degree advance. When I revved the engine like you suggested the RPM value on the meter dropped to 0. The engine is running good acceleration is smooth What could cause the meter to head to 0 on acceleration. Thanks Ed

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