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Spark plugs

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saltshaker

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From a novice......
I have a 75 TR6
What is the preferred spark plug. My car seems to be missing when it's cold. I was thinking maybe a different set of plugs may help.
Suggestions???
 
I'm in Jay's camp. Bosch Plats.
 
I also like the Bosch Platinums, they seem to last longer and maybe its just my imagination, but I think they fire alittle hotter. My TR3 runs better using them.
 
Ken G @ BFE once reported finding 5 more hp on the dyno, just by switching to Bosch platinums. He didn't believe it either, so they switched back and did another run that confirmed it. Of course, that was a somewhat modified TRactor motor.

Can't say if I saw an increase in power or not, but I've been running them for a long time and they seem to work well for me.
 
saltshaker said:
From a novice......
I have a 75 TR6
What is the preferred spark plug. My car seems to be missing when it's cold. I was thinking maybe a different set of plugs may help.
Suggestions???
Click to expand...

Reading this thread and the posts from just those who replied, you'll see that there is no one single preferred plug. There never will be.

When the engine is cold you have a lot of things working against you, mostly related to the way the fuel acts in the carbs and the combustion chambers.
Adjust the cold start (choke)cable and fast idle cam, as well as the carb mixture, idle speed and synchronization as per the manual and ignition timing with a Vacuum Gauge hooked up to the Anti Run-on Valve's vacuum nipple on the manifold's banjo fitting. Then, at least you know that you have all that right.
Might want to read this for setting the timing:
https://automotivemileposts.com/garage/v2n8.html
 
Any of you Bosch Platinum guys -- What is the proper number to fit TR3?
 
Moseso said:
Any of you Bosch Platinum guys -- What is the proper number to fit TR3?
Click to expand...

I use Bosch 4032 WR7BP and have been very happy with them.
 
1 Champs
1 NGK
5 Bosch Plat tips.... so far it seems a bit tipped in favour of th' Bosch Plats to me.
 
TR4nut said:
I use Bosch 4032 WR7BP and have been very happy with them.
Click to expand...
Ditto
 
My favorite sparking plug. They're so pretty!

DSC05131.jpg
 
Champion RN12YC or if the engine has some higher performance mods, RN9YC.
Forget the "R" if you don't worry about radio noise.
 
angelfj said:
My favorite sparking plug. They're so pretty!

DSC05131.jpg
Click to expand...

Those look like the Susan G. Komen specials....
 
Isn't this interesting... In another forum not much more than a week ago I was the only Bosch Platinum user, and the overall consensus was NGK plugs were great, and there were problems with Bosch Platinum's.

I've used the Bosch for about 10 years in the '73 TR6 and have liked them. Mine get replaced about every 12-18 months because the seal washers get compressed to nothing after 5-6 checks of the plug color. This year's been rougher - don't ask.

So - I decided to give the coveted NGK's a try, sorta. Why try a standard plug? I put in the "V" type a week ago to test 'em. BP6EY. Right away I noticed a change in the exhaust "note". Not as loud, but more even. Yep - very subjective.

I went with the "V" type because according to NGK the spark is always on the outside of the gap so ignition of the "charge" is better. Other reason; we do things electronically to improve ignition - MSD or XR-3000 with sports coil. This may be a physical addition to those electronic improvements.

I've been working on mileage the past month. Couldn't get above 20 mpg. First pass at mileage now is 21.6. Still low, but an 8% improvement. I won't give that all to the plugs, though - too early.

The car's performance does "feel" better. Again - subjective.

The Bosch plugs are not supposed to be gapped - you put them in as is. I've always opened them up (as with the NGK's) to 0.037 - 0.038". That could be a difference I'm responsible for.

Anyway - if your list is low, try out the BP6EY's.
 
A bump and another thing - after a perfect 50 mile ride today I made sure to feel the coil when I got home. Going by the old 140 degree F rule, I could keep my fingers on it for about 10 seconds (< 140 deg F). I couldn't touch it more than a second with the Bosch plugs (>140 deg F).
 
Sounds like your coil is running awfully cool. Usually you can not hold your fingers on the ignition coil when it has been run for a while and that would be normal.
 
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