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Spark plug questions again 700

posted by  Azureblue on  Fri Apr 22 14:28 CST 2005
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I've had a set of Bosch Plat 4's in my 740T for about 9 months now. they were recommended as being the greatest, blah blah etc. A month or so ago, I learned that these plugs are not recommended for T's- couldn't find the reason, and I should remove them. They seemed to work OK. I got a set of NGK BPR6EY's, checked the gap to see if it really is .028, and put them in. I was told that the V- groove plug is really good for a turbo - less chance of blowing them out under boost. Comparing, I think the NGK's accelerate better for a standing start, but they seem to lack something at highway speed accelerations. I'm trying to get the best gas milage, not create a street racer, BTW. 'Nuff of those around as it is.
So I guess I could use a lesson in plugs, what I am dealing with, and if I'm doing the right thing, or could i do better. Any teachers out there?
R








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    Spark plug questions again 700

    posted by  allen820 on  Fri Apr 22 15:43 CST 2005
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    The ipd # for NGK spark plugs for a turbo 740 is CYBP7ES. That is the number for the non-resistor plug, which is the one you want if you have typical resistor wires. I am thinking the BPR6EY's you are using are for the non-turbo, so you may want to check that out. Look in an ipd catalog, or go to www.ipdusa.com for more information. And do use the NGK plugs in the proper size and heat range. Anything past that is snake oil, IMHO. Allen








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    Spark plug questions again 700

    posted by  Aye Roll on  Fri Apr 22 15:34 CST 2005
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    last visit: Tue Oct 14 21:08 CST 2014
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    I run Bosch WR7DS (silver) plugs in our 245T. It really seems to like them, and is much happier than it was with Platinums (of unknown vintage however).

    The copper WR7DC's seem to work fine too- and they're 1/4 the cost, so maybe replace them twice as often?

    As for economy in a Turbo, well, that's what the boost gauge and your right foot are for. Keep it out of the boost, you get better economy. If changing plugs could make that much of a difference, the manufacturers would be using whatever "magic bullet" spark plug there is.
    --
    Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!








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      Spark plug questions again 700

      posted by  Azureblue on  Sat Apr 23 11:07 CST 2005
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      The V tips were listed on the parts place's computer as for the 740T. After running on them for two days, I don't think they are an improvement over the Plat 4's. They seem to bog under WOT, and don't seem to work well until the engine has warmed up a bit. But they are an improvement on half throttle acceleration. I was advised to check out the Autolite double platinums. I'll give the NGKs one more day to be sure.







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