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Thread: Anyone running NGK spark plugs?

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    Luke Skywalker
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    Anyone running NGK spark plugs?

    I installed a set of BPR6HS plugs (used to be BPR"5"HS that was recommended?) and now the car seems to idle and run a bit rougher than when I had the older BPR5HS plugs in. I had the old plugs gapped at .032 and it seemed to run smooth there. I'm going to put the older plugs back in to see if that makes a difference. If the gap is the issue the "6" NGK's have a recommended gap of .025.
    What else should I check in regard to ignition? When I had the old plugs in they ran well with the newly installed points and condensor.

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    Luke Skywalker Roger's Avatar
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    Re: Anyone running NGK spark plugs?

    The 6 is a harder plug than the 5, that is it runs a bit colder and is marginally less tolerant of contamination, like oil.
    Why did you change to 6?
    Roger
    Ancient Briton
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    Luke Skywalker
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    Re: Anyone running NGK spark plugs?

    I changed to 6 because that is what the NGK online site has listed. I wonder if the 6's are are the new uprated 5's??? I reinstalled the old (not really that old and a nice tan color) BPR5HS plugs and the motor ran smoother. Maybe i will try the 6's at .032 and see what happens?

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    Luke Skywalker Roger's Avatar
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    Re: Anyone running NGK spark plugs?

    No, the 6s are the 6s and the 5s are the 5s. They have slightly different specifications. All manufacturers have plugs with different heat ranges, you moved from one range to another.
    If your engine runs rougher, it may be you have an occasional misfire. Might be plug gaps, you could try the 6s with a larger gap, but it might also be the heat range. How old is your engine, how many miles since a rebuild? Is it oily, blue smoke exhaust? Lots of questions, but if it were me I'd go back to the 5s.
    Roger
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    Yoda martx-5's Avatar
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    Re: Anyone running NGK spark plugs?

    The "5"s are hotter, which have a tendency to burn off deposits easier than colder plugs. If you are running rich, that may be why the engine is running smoother with the "5"s. I'd also put the gaps at 0.025", as that is the factory spec. It was initially 0.032", but it was changed early on due to mis-firing.
    Art
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    Jedi Knight
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    Re: Anyone running NGK spark plugs?

    I went with the 6's because when because Jeff at Advance did my distributor I bought the Cap(side exit),wires,rotor ,points and plugs from him and Its what he recommended.
    No problems .I change them every 5k or so and I usually keep the old ones for spares because the look like new.
    Tom

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    Luke Skywalker
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    Re: Anyone running NGK spark plugs?

    I also have an Advance distributor and NGK have the "6"s listed as the plug to use for the TR3 on their website so I am wondering if the engine is running rich? Maybe I should lean out the carb mixture a bit?

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    Luke Skywalker LarryK's Avatar
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    Re: Anyone running NGK spark plugs?

    I used the 6s in a 2ltr GT6 with no problems, don't know about the TR. The Jag shop I worked for used NGK for everything. My favorite is Champion, never had but one failure in 53 yrs. Had one separate the porclein from the metal on a V-12 Jag. Thought I dropped a valve, new plug andball was well.
    Larry K
    58 Jag 3.4 MK 1 auto under restoration, 57 Jag 3.4 MK1 manual ,
    03 Cooper S, 2011 Cooper S Countryman, 2011 Land Rover LR4 HSE LUX, 1964 Valiant V200
    Also had , 68 Cortina 1600E, 64 Spit 4 & 80 1500, 73 GT6 3, 71 XJ6, 79 XJ6, 86 XJS V-12, 53 XK120 OTS.

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    Obi Wan
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    Re: Anyone running NGK spark plugs?

    I've been using Bosch Platinum plugs in the TR6 with no problems and burning the right color showing a correct mixture.

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