What plug and gap should I run for 250 shot?
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Joined: Nov 2001
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From: NE Texas
What plug and gap should I run for 250 shot? Going to spray the 422 with about a 250 shot. What type of plug should I run and what should I gap it at? Thanks.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? Autolite AR472 with a .035 gap can get you started. That's the coldest damn plug you can get so you might want to start there and work up, but I doubt you will need to. That's what I use in mine, ARE uses it in the Silver Z, Taner, RomanSS, Tom Kempf and a few others use it as well.
Re: What plug and gap should I run for 250 shot? Are they suppose to be fast guy's and fast cars???? 
ARE uses it in the Silver Z, Taner, RomanSS, Tom Kempf and a few others use it as well
ARE uses it in the Silver Z, Taner, RomanSS, Tom Kempf and a few others use it as well
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? Small disclaimer, the AR472 is only a plug you can use on race day and to put the car on and off the trailer. You cannot motor pass or drive on the street with them, they are too cold.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? You can switch over to NGK's and run those too. TR6 Should be fine on motor. Maybe a TR7 if it's an all out race motor. I just use TR6's and it runs well on motor but I would never spray on them.
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Re: What plug and gap should I run for 250 shot?
Small disclaimer, the AR472 is only a plug you can use on race day and to put the car on and off the trailer. You cannot motor pass or drive on the street with them, they are too cold.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? Simple, they are 8 to 9 ranges cold. You'll foul them up because the motor doesn't do enough to use that cold of a plug on it's own. It runs like chit basically. Going back to a TR6 makes the motor a bit happier.
Re: What plug and gap should I run for 250 shot? DERTY....NGKs are 1 step colder, Autolites' are 8-9?
Is there a plug in between about 4 steps colder than stock?
That doesnt sound like fun, having to change plugs when I want to spray.
Is there a plug in between about 4 steps colder than stock?
That doesnt sound like fun, having to change plugs when I want to spray.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? A TR6 is one range colder, a TR7 is two, a TR8 is three. All three can be purchased from an NGK dealer or from Thunder Racing I believe. Autolites offer the same spectrum continuing down from there in their racing plugs. They end at like 5 ranges colder (AR472) or something like that. You can also get an equivalent NGK racing plug to the AutoLite. You'll have to go through the respective books for the part numbers because I don't have them around.
Edit: Autolites end 5 ranges colder not 8. Too confused with the numbers of the different plugs.
Edit: Autolites end 5 ranges colder not 8. Too confused with the numbers of the different plugs.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: What plug and gap should I run for 250 shot? No, if the plug is too cold the motor will foul the plugs. You need to raise the heat range until it quits fouling. You typically run a colder plug when you are spraying bigger shots. Some can get away with motoring around on a TR6 or 7 and spraying on top of it. Everyone's setup is different and you have to find your own safe setup from there.
TECH Apprentice
Joined: Jun 2002
Posts: 321
Likes: 0
From: Bowling Green, KY
Re: What plug and gap should I run for 250 shot? we ran NGK V-power R5724-8's on Brians C5 when it ran 9.87@139 which is a 100 dry/150wet setup. This plug is better than a normal TR plug because the tip has a groove cut in it and the electrode is cut back to open up that tip more.
We've driven the car back and forth to the track 3 times ( 60-70 miles est) with these plugs in... no misfire or ignition problems yet.
We've driven the car back and forth to the track 3 times ( 60-70 miles est) with these plugs in... no misfire or ignition problems yet.
