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

greg fulk · 01-14-2009, 08:00 PM

Bill I think their's some guy up in Ohio that dose it when he's not playing with a nitro funnycar!

69Cobra · 01-14-2009, 09:39 PM

Come on now guys... what's the reason or benifit of cryo treating plugs?

Bub Whitaker · 01-14-2009, 10:50 PM

It keeps em cool...

quickford1 · 01-15-2009, 11:22 AM

I don't know about the cyro , but I do sell alot of Autolite AR 3910X and AR3933X to the go cart guys. It's a surface gap plug that has proven to be worth some big gains on their dyno.
Rich

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: 3,409 Likes: 506 Liked 329 Times in 177 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: 416 Likes: 3 Liked 564 Times in 66 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

01-14-2009, 08:00 PM	#7
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: Spark Plug Indexing Bill I think their's some guy up in Ohio that dose it when he's not playing with a nitro funnycar! __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

01-14-2009, 09:39 PM	#8
69Cobra Senior Member Join Date: Aug 2007 Location: California, Ky Posts: 669 Likes: 61 Liked 2 Times in 2 Posts	Re: Spark Plug Indexing Come on now guys... what's the reason or benifit of cryo treating plugs? __________________ Kris Rachford 69 Cobra 428CJ 4 Speed C/S 3032

01-14-2009, 10:50 PM	#9
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Spark Plug Indexing It keeps em cool... __________________ Bub Whitaker

01-15-2009, 11:22 AM	#10
quickford1 Member Join Date: Aug 2008 Location: Davidson, NC Posts: 269 Likes: 521 Liked 20 Times in 12 Posts	Re: Spark Plug Indexing I don't know about the cyro , but I do sell alot of Autolite AR 3910X and AR3933X to the go cart guys. It's a surface gap plug that has proven to be worth some big gains on their dyno. Rich