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Author Topic:   Spark plugs for alcohol?
rnoswal53
Dirt Maniac

Total posts: 120
posted February 07, 2005 05:19 PM  
What should I use for spark plugs running alcohol? Heat range, gap and any other useful information. Is indexing more important with alcohol?

Thanks
Russ

mod27
Dirt Freak

Total posts: 325
posted February 07, 2005 05:59 PM  
I run the Champion 670 Racing plug.
Gap will vary on motor compression. I run MSD ignition and run my gap at 45

NGK has a good race plug also.

[This message has been edited by mod27 (edited February 07, 2005).]

Fastride 38
Dirt Maniac

Total posts: 125
posted February 07, 2005 07:11 PM  
It would be helpful to know what heads you are running also.

rnoswal53
Dirt Maniac

Total posts: 120
posted February 07, 2005 08:22 PM  
Cast iron, 461 double hump, 2.02 intake, 1.60 ex. Angle milled and 12 to 1 comp. pistons. HEI ignition. I cleaned up the heads under the valve seats and the bowl. Edlebrock Victor Jr intake. Aluminum roller rockers. Solid lift cam, .557 in and .533 ex. Elgin. Anything else?

Thanks
Russ

sdracer12
Dirt Maniac

Total posts: 180
posted February 07, 2005 10:01 PM  
I've always used Autolite AR133 racing plugs on alcohol. We run MSD box, and gap the plugs at .35. They've worked very well.

We do index the electrode to the top of the chamber, but it's more for piston clearance at the dome than anything else. We put a magic marker stripe on the ceramic, in line with the electrode, and mix and match the plugs and test fit them in the cylinders until they are all where I want them.

rnoswal53
Dirt Maniac

Total posts: 120
posted February 08, 2005 08:05 PM  
Anyone else with any other suggestions?

Thanks

fastwrench
Dirt Newbie

Total posts: 2
posted February 08, 2005 09:47 PM  
Try a NGK Part #5670-8- plug stock #[3354] or #5670-9- stock #[3913] depending on the heat range you need. note the 8 is hotter than the 9 those spark plug number should fit the Dubble hump heads you have. and run great on alky. I have run NGK plugs for years with no problems ever. set gap at .035 to.045 with HEI.

[This message has been edited by fastwrench (edited February 08, 2005).]

[This message has been edited by fastwrench (edited February 09, 2005).]

dluna
Dirt Freak

Total posts: 334
posted February 08, 2005 09:54 PM  
We ran the NGK V-Power Racing plug last year and had good luck with it.

R5673-10 stock # 4050

Fastride 38
Dirt Maniac

Total posts: 125
posted February 09, 2005 04:17 AM  
I always ran the 133's also with the 461 heads. Gapped at 40 with a Accel super coil on top of the dist.

[This message has been edited by Fastride 38 (edited February 09, 2005).]

happy
Dirt Full Roller

Total posts: 73
posted February 09, 2005 04:22 AM  
Did any of you have problems with the ceramic on the Autolites start to break apart?

jd97brian
Dirt Full Roller

Total posts: 46
posted February 09, 2005 07:20 AM  
I have had porcelin come out of 2 different Autolite Racing plugs. The last time I had just put in new plugs and took it down the gravel road one mile and came back and took the plugs out and had a plug with the a peice of the porcelin gone. I've been running Champion plugs with pretty good luck and I use a v57c for my alcohol motor.

Racer111
Dirt Freak

Total posts: 259
posted February 09, 2005 02:56 PM  
Used Autolites for years never had any problems.There the best when running alky.

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