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TR2/3/3A NGK BPR5HS spark plugs I believe are one stage hotter....

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K

karls59tr

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than the regular plug for the Tr3. What affect would running this plug in an engine with new ignition parts and the carbs set up properly?
 
Keoke

Keoke

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karls59tr said:
than the regular plug for the Tr3. What affect would running this plug in an engine with new ignition parts and the carbs set up properly?
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AS long as they agree with your regular plug's dimensions and the heat range for your engine or the fuel type you use they should be fine.Most LBC users prefer them.
 
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karls59tr

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This plug is not the correct heat range for this engine but is a " hotter" plug. I just wondered what the affect on the engine would be if any?
 
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sp53

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I have used them with no problem. I think the 5 series ishotter than the 6 when it comes to NGK. These cars were made at a time whengasoline was higher octane anyway. My experience has been that the plugs needchanging more often anyway, so it is difficult to tell a plugs true lifetime. Somestuff that will help the plugs are metal plug wires and top quality fuel. A qualitycoil helps a lot also. Some of the stuff today is real crap. I bought a lucuscoil that lasted a week. You can get good substitutes that work well that fitcars from the 60’s
 
Keoke

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Sometimes in a worn engine a hotter plug will improve the engines performance. Just have to try it and see.
 
CJD

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The up-side to a hotter plug is less carbon fouling of the tip if you frequently go for short drives, so the fuel mixture is richer for a higher percentage of your drive. Lots of city driving with long periods idling is another time the hotter plug will be less likely to foul.

The down side is it could cause "pinking" when the engine is fully warmed up and being driven hard. So it may require a slight reduction in timing advance. If all your driving is freeway, a cooler plug may be advantagious.

Of course, both of these statements are generalities. Your driving pattern makes all the difference in proper heat range. The goal would be the coolest heat range that does not cause fouling.
 
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