Evo Engine / Turbo / DrivetrainEverything from engine management to the best clutch and flywheel.
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Copper plugs are cheaper but need to be changed more often. Plugs with the heatrange of 7 should be good for boost levels of 25 and below. If you're running more than that, you should probably go for heatrange 8.
Last edited by MasterNater; Feb 9, 2009 at 09:51 PM.
I think my BPR's knock less than BR.. it may be subjective... but theory goes that the closer the spark to the center of the chamber (with projected/protruding design) — to ignite the mixture from the center — the better the results/burn. If it's burning from the middle the process should happen faster (good for power and knock prevention). Non-protruding/projected tips were designed for smaller clearance chambers to avoid the piston hitting the plug tip.
It's also thought that BR is a half step colder than BPR..
All above, FWIW...
^ Thinking about it that does make a lot of sense. I did run the BPR's for a while like I said though the car seem to run a bit smoother from the BR's. This was on the stock heat range with full boltons.
Now I'm big turbo and switched to the 8's. I immediately just picked up the BR's as I ran them in the 7's.
I'm going to grab BPR8's and see if I can feel any difference good or bad from the BR8's. I'll put the car into various situations and log each (Not sure that I'll see anything).
I def see where the theory of the protruding tip should produce a more complete burn.
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Originally Posted by mplspilot
I think my BPR's knock less than BR..
There is another school of thought which contends that a protruded tip, such as that of the BPR's is more prone to preignite the air/fuel mixture than the BR's recessed tip is. In this scenario, the hot, glowing tip, protruding further down into the combustion chamber, auto-ignites the air/fuel mixture prematurely, before the piston reaches TDC on the compression stroke, and before the sparkplug fires.