OK! What are your thoughts on splitfire & delco's & bosch & ngk with all the hype they say about better ignition? If you index your plugs and don't burn oil I don't see where they would make that much difference for the price. RP peggys other half
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Peggy Diegan

I have experimented on the dyno with a variety of differing plugs including split fires and the new fangled AC rapid fires with absolutely NO DIFFERENCE in performance! I suppose if you have a weak ignition that these remedies may/maynot work.

With the design of new aftermarket heads I find that the old practice of indexing doesn't do anything as well. I used to do that on race applications all the time, but with the proliferation of extreme ignitions and accurate timing and newly blended fuels, I can't find one ioda of difference on dyno runs with modern heads and accessories.

The use of the appropriate copper or platinum core plug with a sound ignition and wires is the key to consistant, reliable and hearty performance in my humble opinion.

Steve Jack


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SOUTHEASTERN GOODGUYS REP

Hi RP! I've never seen indexing plugs outside of racing and can't imagine there being any advantage to it in a street engine. If you had a full blown engine (pardon the pun..) with the attending high compression and having to run 104 octane, indexing is said to help by keeping the flame front starting from the same point.
Here's the kicker on the so called "splitfire" plugs, they've been in use in aviation for probably 30 years that I know of and most likely longer. The idea that the multiple sections of the ground anode will fire to the coolest one or in a circle. They have long life, seldom ever needed cleaning and came at an astronomical cost to the military and probably civilian as well! (they also fit the old Chevy sixe's!) pullouts of course.....
I believe that when it comes right down to it that for street use, there's little difference in how it affects power. Higher compression and/or lean tuning however will ruin a set very quickly. What with today's great ignition systems and computer control, almost any plug will do. Just my 2 sense worth!
PS; The amount of Platinum on Bosch plugs is most likly a bit of advertising and eye wash!

might triumphs over right

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Fred P.

I have another question to add to this, as the topic is very timely to my task at hand. I'm running a small block chevy, with points distributor and accel coil. I've been using AC Delco r44t plugs. They seem to load up all the time. Is there a better plug to use, or, another heat range?

I have had very good luck with autolite spark plugs. I would suggest verifying the mixture and timing are right on, then, if the problem still exists, switch to an autolite #26. It's a step hotter and you can't flood an autolite plug as easy as an A.C. Just some advice from the 'Ol Fat Fender Dude!!

on plugs frist is the deposit oil or from wet spark sometimes you can open your gap .002 and take care of it when you use high out put coils the plugs can handle it but you also must keep a close eye on your points as to close or to wide of a gape will do the same thing

I tried the splitfire plugs, did not change the RPM
at idle or the gas mileage. Side note on plugs, AC
stands for Alex Champion its Champions brother. They
got into a fight over how the plug should be made, and
split up the Co. Just a tidbit.
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DAN JARMAN 1-800-787-3781

This is great news. I used to buy champions all the time in my youth I got a couple of bad plugs and switched to ac delco and never looked back. I just built a small block and was having problems with loading up and talked to the machinist about splitfire and the others he agreed with all of the obove SAVE YOUR MONEY. I went from a holly 750 to a 600 double pumper and all is well on the home front I really enjoy all the input everybody has somtimes we agree and somtimes it's time to switch.
Dr. Pepper

Somemore BS, Delco stands for Dayton Electric Co. Two
engineers from NCR put an electric cash register motor
on a 1912 Cad. and started Delco.
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DAN JARMAN 1-800-787-3781

Just as a side note to Spark plug indexing... I used to help my neighbor with his Pulling Truck. Big Block Chevy, 14:1, Enderle injector running Alcohol. We had to index the plugs so the pistons wouldn't crush the electrodes... This usually isn't a problem in a street motor. Mark