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Spark plug gap


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#1 code red

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Posted 30 August 2011 - 04:38 PM

Was wondering what kind of plug gap to run with an MSD 6A ignition. Have been told up to .050 in. but that sounds like alot. Just curious what everyone else was running.

#2 gonzo 1066

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Posted 30 August 2011 - 05:39 PM

I assume this is on a tractor?? The coil you use will have a lot to do with plug gap. With my 440 with a 6-AL and a HOT MSD coil I am at about .035. This seems to work good up to 7500rpm.

"Rooster" 1066 puller tractor,
 "Banty" 666 7000# Puller toy, 312 3-LM Has stuff done to it.
"Emmy Lou" 1939 M , 1939 Farmall H (to be named later)
'  F-1206, 2WD 5088  1066 to be restored
2 782 Cadets 1 repowered.Cub 1572 Diesel  CanAm 800
 Dodge Cummins truck 2013"Buckweet"yes its automatic transmission
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#3 code red

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Posted 30 August 2011 - 06:17 PM

We have an MSD blaster coil. Yes it is on a Farmall M.

#4 gonzo 1066

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Posted 30 August 2011 - 06:31 PM

The blaster and blaster 2 will jump a pretty big gap. Your compression ratio does make a difference, higher cylinder pressure generally wont jump quite a big a gap. I would assume that .040 would be maximum for a normal compression low RPM M engine. I hope that there are others more in tune to the lower speed use. I am sure some will chime in.

"Rooster" 1066 puller tractor,
 "Banty" 666 7000# Puller toy, 312 3-LM Has stuff done to it.
"Emmy Lou" 1939 M , 1939 Farmall H (to be named later)
'  F-1206, 2WD 5088  1066 to be restored
2 782 Cadets 1 repowered.Cub 1572 Diesel  CanAm 800
 Dodge Cummins truck 2013"Buckweet"yes its automatic transmission
[i][color=#FF0000]

Can am outlander Max, XT Honda ST 1100
Torchmate CNC Plasma cutting table



 


#5 randy hall

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Posted 30 August 2011 - 07:26 PM

Was wondering what kind of plug gap to run with an MSD 6A ignition. Have been told up to .050 in. but that sounds like alot. Just curious what everyone else was running.

i use .045 with autolite 3116 spark plugs with over 300# compression.

#6 code red

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Posted 31 August 2011 - 09:11 AM

Thanks for all the good info. As always a great forum.