Date: Sat, 6 Dec 2003 21:06:13 -0700
From: "jon banquer" <>
Subject: Re: NGK Spark Plug Question

"Hyperdog" <> wrote in message news:l8dzb.168420$ > The variable here is the number that NGK uses to rate the "heat" of the > plug. A "hot" spark plug will have a deeper recessed "groove" separating > the center porcelain core insulator from the steel, threaded shell. This > empty space becomes filled with intensely hot gas upon combustion and, with > limited paths to export this heat, the tip of the plug remains hotter than a > similar plug constructed with a more shallow "grove". Hot plugs stay > cleaner. The objective is to run the hottest plug you can with out the > porcelain turning "toasted brown" after hard driving. DANGER. Run a > too-hot plug for too long and you destroy pistons (Rare). If you use high > octane fuel you can run a hotter plug. If you drive HARD use a colder plug. > All the plugs you listed are "mid range " plugs. Not "cold" (racing) plugs > or hot (anti-oil-fouling) plugs. With NGK, the LOWER the number the HOTTER > the plug. Opposite with Champion. Check your plug's color. Black or > nearly so... too cold. Toasty brown.....too hot. Warm tone of light > grey....juuuuuuuuust right. HINT: If your '91 uses a distributorless > direct ignition system, do not use BOSCH Platinum Plus plugs!! They eat > ignition cassettes. I learned the hard way. Twice. Fool me once, shame on > you. Fool me twice, shame on me. > > Hyperdog > > "jon banquer" <> wrote in message > news:bqbh7d$1vnhrd$ > > What is the difference between NGK BCP5EV, NGK BCP6EV and > > NGK BCP7EV ? > > > > I have a 91 900S 16V non-turbo. The car currently has BCP6EV's. > > How do I know which one is right ? The car is completely stock. > > > > jon > > > > > > > > The car does have a distributor. I don't see any advance mechanism though. Thanks for the tips on plugs. I went with the BCP6EV. The old plugs do have the light grey color you say is "juuuuuuuuust right". :>) Thanks again ! jon

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