TR Ignition upgrade Spark plug ? - Page 4 - Off-Road Forums & Discussion Groups
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post #31 of (permalink) Old 11-30-2002, 11:53 AM
 
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Re: TR Ignition upgrade Spark plug ?

Alright guys, I get the point [img]images/graemlins/grin.gif[/img] I did just finish up the TR with the Platinums at 045. Just Awesome. My miss at idle is gone.

The plugs have about 50 k on them, and they came with the Jeep. They still look really good. I will, however, consider the Autolites when it's time to change them!

Thanks for all your help!
-OS
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post #32 of (permalink) Old 11-30-2002, 12:58 PM
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Re: TR Ignition upgrade Spark plug ?

I've had good luck with Bosch plugs. I've used them (the plain old platinums) for over 50k without any performance degradation on one vehicle (I check the mpg at EVERY fill up). Naturally since I tend to go with what works practically - I graduated to Plus 4's when they came out.

RRich brings up some good points however. Just because you get good life out of the plug ...is the plug good for your engine under some conditions? They do have one heck of an insulator and the heat range is going to be different from the OEM recommendations.

So ..do they work and work well from a longevity standpoint? By my experience, yes! ..but are we serving our engines in the best manner by using them ..or just saving ourselves a little down time at the expense of something else?
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post #33 of (permalink) Old 11-30-2002, 05:28 PM
 
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Re: TR Ignition upgrade Spark plug ?

Well, . . . .045 really isn't the right gap, the right gap is .035. Changing to the TFI coil gives very little voltage increase unless you eliminate the resistor wire and upgrade the module (which I didn't.) What's happenning is that the voltage is marginally enough for the larger gap. Platinum is less conductive than copper, and adds enought resistance to make it miss every no and then.

I've since added an MSD6 module, which does produce more voltage at the coil secondary, and I can run the plugs as high as .055 without any problems.
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