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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hello, 1951 Comet- and what are your suggestions for additives to the petrol ?
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<blockquote data-quote="ClassicBiker" data-source="post: 142906" data-attributes="member: 1632"><p>Avgas still contains tetraethyl lead, which totally destroys the catalytic converters in modern vehicles by plugging up the small passages through which the exhaust gas flows. Here in the U.S. you haven't been able to purchase leaded fuel at filling station since 1 January, 1996. You can still buy leaded fuel at certain outlets for off road use only or avgas at a small airport. But you aren't supposed to use it on the road as it hasn't been taxed for that.</p><p>As far as 10% ethanol and 93 octane goes, I haven't had any issues with it since I started adding a little gas preservative to it when I fill up, Sta-Bil is the brand name. This considerably slows down the evaporation of the aromatics that make gas volatile and also prevents the ethanol from absorbing water from the air. It is some concoction of petroleum distillates.</p><p>There are a number of gas stations around here that sell pure gas with out ethanol, at a premium, and also sell unleaded higher octane pure gas, again at a premium.</p><p>To answer Philips' question. In my opinion as long as your fuel system components are not adversely affected by ethanol and you use a fuel stabilizer, you're going to be alright. As Mike 40M correctly points out when these bikes were produced the octane rating of fuels were much lower. My Shadow has 7.3:1 pistons in it that my father put in during the late 70s, early 80s. I have no idea what is in my 1950 Comet as it was running when I bought it. I've run 89 octane with 10% ethanol regularly in them with no issue. My 60s and 70s Triumphs have 9:1 pistons and 93 octane and 10% ethanol doesn't bother them. My 1995 Triumph which I'm sure is at least 9:1 has a minimum rating of 89 octane. As to amounts of fuel stabilizer to use, the brand I mentioned above recommends 1 ounce treats 2.5 gallons or if you prefer 30mL treats 9.5 litres. Occasionally I pour in a little carb and fuel injector cleaner for good measure. Just a splash, nothing measured. Everything seems fine.</p><p>Hope I've helped.</p><p>Steven</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 142906, member: 1632"] Avgas still contains tetraethyl lead, which totally destroys the catalytic converters in modern vehicles by plugging up the small passages through which the exhaust gas flows. Here in the U.S. you haven't been able to purchase leaded fuel at filling station since 1 January, 1996. You can still buy leaded fuel at certain outlets for off road use only or avgas at a small airport. But you aren't supposed to use it on the road as it hasn't been taxed for that. As far as 10% ethanol and 93 octane goes, I haven't had any issues with it since I started adding a little gas preservative to it when I fill up, Sta-Bil is the brand name. This considerably slows down the evaporation of the aromatics that make gas volatile and also prevents the ethanol from absorbing water from the air. It is some concoction of petroleum distillates. There are a number of gas stations around here that sell pure gas with out ethanol, at a premium, and also sell unleaded higher octane pure gas, again at a premium. To answer Philips' question. In my opinion as long as your fuel system components are not adversely affected by ethanol and you use a fuel stabilizer, you're going to be alright. As Mike 40M correctly points out when these bikes were produced the octane rating of fuels were much lower. My Shadow has 7.3:1 pistons in it that my father put in during the late 70s, early 80s. I have no idea what is in my 1950 Comet as it was running when I bought it. I've run 89 octane with 10% ethanol regularly in them with no issue. My 60s and 70s Triumphs have 9:1 pistons and 93 octane and 10% ethanol doesn't bother them. My 1995 Triumph which I'm sure is at least 9:1 has a minimum rating of 89 octane. As to amounts of fuel stabilizer to use, the brand I mentioned above recommends 1 ounce treats 2.5 gallons or if you prefer 30mL treats 9.5 litres. Occasionally I pour in a little carb and fuel injector cleaner for good measure. Just a splash, nothing measured. Everything seems fine. Hope I've helped. Steven [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hello, 1951 Comet- and what are your suggestions for additives to the petrol ?
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