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Author Topic:   Spark Plug Gap ?
Kent
Dirt Maniac

Total posts: 102
posted May 08, 2005 03:17 PM  
Hi, I run a 355 sbc, and I use the Autolite ARP 134 sparkplugs and was wondering if there is a prefered gap for this plug. I use a stock dist. with a DUI cap, rotor, and module. I have been gapping these plugs at .042. Also do you check the gap with the feeler gage flat on top of the electrode or do ya measure the gap at an angle since the top electrode is back away from the center electrode! Just wanting to know how everyone else is doing it! Thanks in advance! Kent

eenfield
Dirt Maniac

Total posts: 116
posted May 08, 2005 03:52 PM  
.035-.040... Depending on what you are running.
Best way to measure is with a wire type gauge. It has little wire loops of different thicknesses. That way you cant accidently measure the wrong side of the wedge, or push the feeler too far back in, and get a false reading.

avila
Dirt Freak

Total posts: 217
posted May 09, 2005 08:55 AM  
myself, i run .045" gap. I just put
the feeler guage straight in, parallel
to the top and bottom of the eltrode.

Kent
Dirt Maniac

Total posts: 102
posted May 09, 2005 04:42 PM  
Eenfeild - you had stated that it depended on what you were running. Can you be a little more specific as far as what you mean? I run 110 octane sunoco race fuel with a 9.3 to 1 compression ratio, Quadrajet carb that runs really well - not too fat not too lean. I have to run stock exhaust so I run rams horm exhaust with 43 inches of 2.5" exhaust pipe. Let me know if you have anymore suggewstions! Thanks in advance - kent

eenfield
Dirt Maniac

Total posts: 116
posted May 09, 2005 06:01 PM  
Monster compression, high octane fuel, high volumes of fuel(like alky), super high RPMs, or combinations of the above require tighter gap... They are harder to light off.

Kent
Dirt Maniac

Total posts: 102
posted May 11, 2005 10:11 PM  
Thanks for your input Eenfeild!

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