Largest, safest spark plug gap for 4.0?
Thread Starter
Member
Joined: Apr 2012
Posts: 154
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From: Pa
Year: 1992
Model: Cherokee
Engine: 4.0
Largest, safest spark plug gap for 4.0?
Obviously a larger gap means a larger spark which can burn more fuel thus more power right? with an aftermarket ignition does anyone know how far you can gap the plugs before you could cause damage to the pistons, rings, cylinder wall, ect? currently at .042 with no problems.
CF Veteran
Joined: Aug 2011
Posts: 1,994
Likes: 8
From: San Jose
Year: 89
Model: Cherokee
Engine: 4.0 I6
Are you running an aftermarket ignition? Did you change your compression or fuel/air ratio? Pretty sure stock spark gaps are .035" unless you changed other stuff and need a larger spark, id leave it at that.
Senior Member
Joined: Nov 2009
Posts: 774
Likes: 7
From: Lowell, MI
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0
This. Unless you have high energy aftermarket ignition or a different compression ratio than stock there is no advantage whatsoever to increase the gap and doing so will just put more strain on you coil.
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