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: 984 Likes: 0 Liked 11 Times in 8 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 22 Times in 22 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: 673 Likes: 15 Liked 547 Times in 93 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: 3,400 Likes: 482 Liked 320 Times in 172 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: 414 Likes: 2 Liked 557 Times in 65 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