The [ dated ] information I have is that the 7s correlated to Champion N9Y and the 6s correlated to Champion N12Y, specified for TR5/6 P.I. and TR250/6 carb respectively, by TRIUMPH. So my experience amounts to " going by the book ". The proper correlation between NGK and Champion is the question, and at the end of the day the colour ought to govern the choice. Other than substantially modified engines, the normal NGK plug recommended is the BP6ES. I note that in the current Moss catalogue , whilst that grade is quoted for 'standard heat range', BP5ES is quoted for use with unleaded fuel and BP7ES for use with increased comp. ratio. I use the BP6ES in my 6 which has a lead-free conversion and a compression ratio of 9.65:1, but occasionally suffers fouled plugs from cold start, which is an inconvenience to say the least. The car in running triple Webers and is fed Shell V Max. Would a switch to the BP 5 plugs improve matters? The carbs have been set up on a rolling road, but, by the time fine jet adjustments were being made, the engine was at full working temperature so cold-start issues were not apparent.

I had to get rid of the slop in the distributor, replace the throttle shaft bearings (vacuum leak), power valve, accelerator pump diaphragm , and plastic float (replaced with brass) on my Weber 32/36. It does this thousands of times each minute. Over time spark plugs start to break down, resulting in a poor spark. A healthy engine needs good clean spark plugs.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. The guy I was dealing with from Champion told me that they had a 10% failure rate straight from production however Denso have given excellent results over the years, not just in std A series engines but in everything from tuned Minors to turbo charged modern performance engines, their platinum plugs are superb, yes they are expensive but will last around 60,000 miles with no noticeable loss of performance. Their iridium plugs are great for turbo cars where there will be very high compression under boost as they generally give a very strong spark. Our cars are 42+ years old, and were designed to run on leaded gas. This was very different chemistry from the stuff we get at the pump today. Currently i have been using the Champion N9YC with no major problems except the car always seemed to take 2 or 3 attempts to start.

I went to a BP5ES plug (slightly hotter than the BP6) and switched to 87 octane gas as another step toward reaching my goals. I consulted NGK in the context of running at altitude (ie Stelvio) and their recommendation was BPR6EIX which is an iridium tipped electrode with a conical shape that they claim provides a better focussed spark. Not tried 'em yet. In my day job I design special purpose blast machines, one of our customers in the 90's was Champion. Blunttech BLUNT, May 3, 2020 2951 views0 comments A customer-centric business, specializing in parts for your BMW or other Euro vehicle.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 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. I know it's been a little while since I've posted. The car is here but still in winter storage out in the burbs, so I only get over there every couple of weeks for a little while since the garage isn't heated and it's 40 miles away (better than 2,200, right?). I'll be bringing it up to my place once the salt has been washed off the roads and the temps come up a little. On 6ES, V-Power or Ultimate + Valvemaster, I get occasional cold-start fouling on my PI. On 7ES it was even worse.