Plug gap & MSD
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Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
Plug gap & MSD
Just finished installing complete MSD package, box, coil, wires, rotor, distributor cap. MSD gives no recommendations on plug gap other than to experiment!
Since it is a PIA to pull plugs thought I'd ask if anyone has found a good range to start at from the stock setting. With the stock setting have pretty good performance, but no apparent change in MPG. Also it wants to ping at stock timing setting, did anyone reset (retard) theirs any? If so how much? dont want to go to premium fuel if I dont have to.
Also what is best performing plug? Generally use champions, have tried the truck plug and I think I have motorcraft/autolight in it now.
This is in 89 351 w/EFI, gibson catback, K&N FIPK, Hypertech chip.
TIA
Hank
Since it is a PIA to pull plugs thought I'd ask if anyone has found a good range to start at from the stock setting. With the stock setting have pretty good performance, but no apparent change in MPG. Also it wants to ping at stock timing setting, did anyone reset (retard) theirs any? If so how much? dont want to go to premium fuel if I dont have to.
Also what is best performing plug? Generally use champions, have tried the truck plug and I think I have motorcraft/autolight in it now.
This is in 89 351 w/EFI, gibson catback, K&N FIPK, Hypertech chip.
TIA
Hank
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Joined: Jan 2008
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Likes: 24
Plug gap & MSD
Try .044" to start.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
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Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
[i][font color=red]Calgary,Alberta,Canada[/font][i]
[font color=blue]Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [font/]
78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
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Plug gap & MSD
[updated:LAST EDITED ON 17-Mar-02 AT 05:54 PM (EST)]Hank, if you have the BLaster II coil (45Kv), then you can safely go up to .052" plug gap, and maybe even wider with the low resistance wires.
The pinging is a mystery. With the MSD system, you should have less tendency for pinging, not more. Maybe the stock timing was accidently changed during the installation?
The pinging is a mystery. With the MSD system, you should have less tendency for pinging, not more. Maybe the stock timing was accidently changed during the installation?
Lead Driver
Joined: Nov 2000
Posts: 6,636
Likes: 349
From: Albuquerque
Plug gap & MSD
I beleive most of the cap. disch. ignitions will give you an apparent increase in timing due to the better/faster spark. You might need to back it off a couple of degrees to compensate.
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