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TR4/4A tr4a plugs
- Thread starter JDstr4a
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TR3driver
Great Pumpkin - R.I.P
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I think L82YC is a bit colder than the stock plug (recommended Champion equivalent is L87YC), but should be fine as long as you don't have troubles with fouling.
I use Bosch platinum WR7BP, but I can't really say they are any better with a stock ignition system. Back when I was running a MSD 6 ignition on my TR3A though, conventional plugs would erode rapidly while the platinum plugs seemed to stand up much better. Ken G. (British Frame & Engine) once wrote that they saw better numbers on the dyno with the BP plugs, but I can't say I noticed any "seat of the pants" difference.
I use Bosch platinum WR7BP, but I can't really say they are any better with a stock ignition system. Back when I was running a MSD 6 ignition on my TR3A though, conventional plugs would erode rapidly while the platinum plugs seemed to stand up much better. Ken G. (British Frame & Engine) once wrote that they saw better numbers on the dyno with the BP plugs, but I can't say I noticed any "seat of the pants" difference.
After having done what they called "drivability" in the auto repair business for some 35 years, I've learned the hard way that the plugs the engine was designed around work the best. That being said, I have also learned that NGK makes a superb spark plug with an extremely accurate and dependable heat range numbering system.
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I've much more experience with the "Small Car" (Herald/Spitfire) engines than with the wet-liner fours, but for over 40 years now I've done very well with Champions. I will admit that the NOS K.L.G. plugs I'm running in my '67 Herald right now seem to be ok, too, but I'll probably switch back to Champions just to see if there's any real difference. :wink:
