#1
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Spark Plug Heat Range
Discussing Spark plug Heatrange on boost.
Engine in the example is a: - Toyota Yaris 1.5L - Normally aspirated engine - Stock 10.5 : 1 Compression / Turbo 8.5 : 1 Compression - Stock Plugs BKR5EYA 0.8mm gap - Street Use Normally when going from N/A to F/I many use 2 steps colder plugs or more according turbo and engine compression. Is it the same case when using water injection ? Water Only for now. Let's say I did go 2 steps colder on the 8.5 compression. Would this result in poorer engine efficiency while idle and cruising than using stock plugs? I think answer is obviously yes! Would water injection reduce spark plug heat range in a way to make it work cooler during combustion? I think the answer is yes if using same fuel and ignition settings. So why would a person switch from N/A to F/I go to colder plugs if he is not running lots of boost ? (above 20psi ? ) I tried it and eventually didn't blow the engine but instead got the engine efficient by leaving stock plugs and inject water immediately on boost. What are your thoughts about this ? |
#2
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Re: Spark Plug Heat Range
The spark plug does not directly control the efficiency of the engine unless you have such a cold spark plug that it fouls itself with carbon deposit leading to misfires.
If you inject water in the right proportion (around 15% to fuel in boost) you would normally not need to use a 1 step colder than stock plug. At the current power level you run, I would use a BKR6EYA. |
#3
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Re: Spark Plug Heat Range
Quote:
I am running BKR6EYA of at right now. |
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