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<blockquote data-quote="oexing" data-source="post: 169056" data-attributes="member: 1493"><p>You can certainly waist a lot of money for avgas if you feel the need for this stuff. But you don´t need it really in Vincents with non-cast iron heads . For iron heads there is the problem of seat wear with unleaded , unless you do the seat ring mod like I did on the Ford heads for every day use. In sick aviation engines with extreme cylinder capacities of 1.6 l per pot you get troubles with pinking so you have to get 100 octane and more for fighting knocking at high loads. So in Vincents 100 octane should be allright even in racers unless you run ridiculous race engines designed for methanol fuel - which is alcohol as well ! As to avgas, in Rotax aviation engines these are designed for unleaded auto fuel , having smaller cylinder bores and higher revs with reduction gears for props. BUT when you run them on leaded avgas it is recommended for oil changes twice as often than with auto unleaded. So that may tell you something ! Also with avgas, pilots with American engines typically face troubles with lead blocked spark plugs or sticking valves in guides. So better use leadfree when lead is no real necessity.</p><p> Blaming alcohol for black spark plugs is barking up the wrong tree. Modern cars on unleaded don´t have black plugs , even our old Ford can have white plugs with lean/ correct mixture. So better care for your carbs and replace worn out jets and finally get carburation right - after decades running the classics overly rich like with most old iron. And yes, get spark plugs with that grade that suits YOUR typical ride and not what´s written in old books. </p><p> Yes, E 5 or E10 can get stale after months in tank storage so this may lead to poor starting in spring. And yes, avgas can help. The cheaper way is to empty the tank in autumn , put the fuel in your car for use there and just have fresh fuel in spring - and be happy ever after. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 169056, member: 1493"] You can certainly waist a lot of money for avgas if you feel the need for this stuff. But you don´t need it really in Vincents with non-cast iron heads . For iron heads there is the problem of seat wear with unleaded , unless you do the seat ring mod like I did on the Ford heads for every day use. In sick aviation engines with extreme cylinder capacities of 1.6 l per pot you get troubles with pinking so you have to get 100 octane and more for fighting knocking at high loads. So in Vincents 100 octane should be allright even in racers unless you run ridiculous race engines designed for methanol fuel - which is alcohol as well ! As to avgas, in Rotax aviation engines these are designed for unleaded auto fuel , having smaller cylinder bores and higher revs with reduction gears for props. BUT when you run them on leaded avgas it is recommended for oil changes twice as often than with auto unleaded. So that may tell you something ! Also with avgas, pilots with American engines typically face troubles with lead blocked spark plugs or sticking valves in guides. So better use leadfree when lead is no real necessity. Blaming alcohol for black spark plugs is barking up the wrong tree. Modern cars on unleaded don´t have black plugs , even our old Ford can have white plugs with lean/ correct mixture. So better care for your carbs and replace worn out jets and finally get carburation right - after decades running the classics overly rich like with most old iron. And yes, get spark plugs with that grade that suits YOUR typical ride and not what´s written in old books. Yes, E 5 or E10 can get stale after months in tank storage so this may lead to poor starting in spring. And yes, avgas can help. The cheaper way is to empty the tank in autumn , put the fuel in your car for use there and just have fresh fuel in spring - and be happy ever after. Vic [/QUOTE]
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