SplitFire 3 Spark Plugs

[Zrush]

While flipping through the Summit catalog I see the SplitFire 3 spark plugs at $5.99 each. Has anyone used these on their Z and if so, did you notice any difference, then say from the NGKs or whatever other brand you were using? $5.99 is a bit pricey so I would like to know if you guys think they are any better then NGKs.

[2ManyZs]

I tried them once in the IT car... any difference? Nope....

Waste of money IMO....

The ones with the 4 tips like an aircraft plug look promising though, in principle at least......can't remember what they call them now.....:stupid:

[AxtellZ]

Yep. I have them in my 74 260, the PO had installed them (i sure wouldn't spend that on them!)

Yes, they work fine, but i see no difference whatsoever from the NGK's in my 73. If you think ignition is your weak point- the plugs are the last thing i'd worry about changing (provided your NGK or whatever are in good shape) Better to look at a Pertronix, or Electronic ignition i think.

Good luck, JA

[Phred]

I've tested a number of spark plugs on a back to back dyno comparison. I've done the tests on Datsun, Cosworth, and formula ford. None of the gimicky plugs produced more HP. The ones with special alloy electrodes last longer and handle high energy ignitions better. The only time I actually saw a HP difference was when we were able to change from a regular tip to an extended tip plug. This was because the regular gap plug was slightly shrouded. Plugs can have retracted, surface, regular, or extended gaps, or tips. The limitimg factor in the type of tip you can use is the physical clearance between the plug and valve or piston. L series engines without domed pistons will accept projected tip plugs. Also, make sure to use the proper length (3/4") plug. The most effecient plug will start the flame front as far inside the combustion chamber as possible. Finally, always use never-sieze lube on the threads, and torque 12 to15 ft.lbs.

Phred

[Mark Schue]

Ditto on what Phred said.

[ZmeFly]

Phred gave you the biggest .02 you could have asked for:classic:

[Zrush]

Thanks all and Phred.......you da man. I better listen to you now rather than hear you later. Just ask and you shall receive a plethera of info on this site. Who needs a freaking mechanic.

[beandip]

:classic: TO ALL REMEMBER THE ANTI SIEZE .:classic:

[ZmeFly]

Remember this, I dont care if it has 4 points to hit or 40 or one, the spark is only going to go to one of these points at any given time.