In my day job I design special purpose blast machines, one of our customers in the 90's was Champion. I started my quest for a smooth idle, peppy acceleration, clean oil, clean plugs and decent gas mileage last year. From what I've seen on this forum the P.I. cars do better with hotter plugs. The above issue about #s 5&6 is a recurring theme too. Some have fattened the plenum to 4" in an effort to correct this.

I understand the generally preferred plug for TR5/6s is the NGK BP6ES, but note the BP5ES is specifically for use in lead free head - VUX's head is gas-flowed and unleaded. Hi Tom, what compression ratio are you running on the Weber engined car. Is it a Stage 2 type head?I have a standard CP 150BHP car and have recently fitted the NGK BP 5 ES plugs. It runs very well on these, better than on the 6ES's. BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated: small, boxy, rear-wheel drive, two-door sedan. Aficionados know better. Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run. BMW 2002 Fjord Blue Ireland Stage II • Bilstein Sports • Ireland Headers • Weber 38 • 292 Cam • 9.5:1 Pistons • 123Tune Bluetooth 15" BBS Tilaa uutiskirje ja voita 50 € lahjakortti Puuiloon! Arvonta suoritetaan joka kuukausi kaikkien uutiskirjeen tilaajien kesken. Voittajalle ilmoitetaan sähköpostitse. Uutiskirjeen tilaamalla saat tiedon tarjouksista, uutuuksista ja ajankohtaisista tuotteista ensimmäisten joukossa! Lähettämällä lomakkeen hyväksyt tietojesi käsittelyn tietosuojaselosteen

In 1976 when I got my 1st '250 all of the parts store catalogs showed N9Y for all TR6 and TR250. After repeatedly fouling these I consulted the owner's manual which called for UN12Y. Fitting these or its equivalent ( Autolite 55 ) ended the problem for good.

This spark plug has corrugated ribs, triple gasket seal, copper core for more effective heat removal, a 21 mm (13/16 inches) hex size, and 0.9 mm (0.035 inches) gap.