Spark Plug Indexing

kingsransomracing · 01-10-2009, 04:21 PM

With indexing the AR3933 spark plugs. If the crush washer does not give it the right position and you install the moroso washer (1 of 3) are you supposed to reinstall the crush washer or leave it off the spark plug since you have a indexing washer on it?

buzzinhalfdozen · 01-10-2009, 06:46 PM

I've always lrft the washer on the plug, makes sense to seal against the indexing washer. Joe

randy wilson · 01-12-2009, 10:55 AM

what is the widest gap some run on their plugs and what benefit have you seen?

Jim Bailey · 01-14-2009, 06:48 PM

Randy, wide spark plug gaps went out with ignition points. With todays MSD's and most other manufacters electronics, there is no reason to run more than .025 gap. As a matter of fact, if your trying to run, say .040 - .050, close the gap down to .020 - .025, and you'll see a performance gain. At least that been my experience. ( and don't forget to have your plugs Cryo'd. - go kart trick! )

FED 387 · 01-14-2009, 06:57 PM

on AR3933 plugs leave the gap alone --run em as they come from the factory just check to make sure that the gap did not close up ratteling around in the boxes---Comp 387

Bill Grubbs · 01-14-2009, 07:01 PM

"( and don't forget to have your plugs Cryo'd. - go kart trick! ) " - Jim Bailey

Hey Jim,

Is there a shop you would recommend for doing this?

Bill

01-10-2009, 04:21 PM	#1
kingsransomracing Junior Member Join Date: Oct 2008 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Spark Plug Indexing With indexing the AR3933 spark plugs. If the crush washer does not give it the right position and you install the moroso washer (1 of 3) are you supposed to reinstall the crush washer or leave it off the spark plug since you have a indexing washer on it?

01-10-2009, 06:46 PM	#2
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: Spark Plug Indexing I've always lrft the washer on the plug, makes sense to seal against the indexing washer. Joe __________________ Joe Buchanan SS/BX 3117

01-12-2009, 10:55 AM	#3
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 21 Times in 21 Posts	Re: Spark Plug Indexing what is the widest gap some run on their plugs and what benefit have you seen? __________________ don,t have one

01-14-2009, 06:48 PM	#4
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 721 Likes: 17 Liked 637 Times in 123 Posts	Re: Spark Plug Indexing Randy, wide spark plug gaps went out with ignition points. With todays MSD's and most other manufacters electronics, there is no reason to run more than .025 gap. As a matter of fact, if your trying to run, say .040 - .050, close the gap down to .020 - .025, and you'll see a performance gain. At least that been my experience. ( and don't forget to have your plugs Cryo'd. - go kart trick! )

01-14-2009, 06:57 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,372 Likes: 409 Liked 300 Times in 160 Posts	Re: Spark Plug Indexing on AR3933 plugs leave the gap alone --run em as they come from the factory just check to make sure that the gap did not close up ratteling around in the boxes---Comp 387

01-14-2009, 07:01 PM	#6
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 405 Likes: 1 Liked 461 Times in 61 Posts	Re: Spark Plug Indexing "( and don't forget to have your plugs Cryo'd. - go kart trick! ) " - Jim Bailey Hey Jim, Is there a shop you would recommend for doing this? Bill