• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

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

Share this page

K

karls59tr

Obi Wan
Bronze
Country flag
Offline
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?
 
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?
Click to expand...


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