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Crank build for racing engine
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<blockquote data-quote="oexing" data-source="post: 179156" data-attributes="member: 1493"><p>To be open, I would not have the balls to run titanium valves, maybe in racing for periodic exchanges. Same with alu conrods, great when you replace them each year or more often, the drag racing guys have them.</p><p> Problem with titanium is the poor properties when in plain bearing applications, like in valve guides - I would not want to picture them in almost redhot conditions for ex valves. The Balzers company offers exotic coatings like shown in my link below. Vincent Speet may have tried some in his engines, cannot tell about experiences myself as I´d have to send parts somewhere and no job for home.</p><p> While I can imagine finding a great coating for the valve stem I would not think there was a way to prevent wear on the seat of titanium valves. Typically you´d find sort of stellited faces for unleaded and Diesel valves for extreme mileages - kilometers too. But then, I don´t quite see the point of modifying old classics to these extremes so in the end there is not much left of the familiar character of the bike when it should be just the fun of having a great time on safe race tracks and producing sounds we remember from long gone times. After all, there is nothing to earn from that racing, just maybe a tin pot to collect dust at home.</p><p> What I criticise most in these communities is the cheating about details in their engines: I bet most of them got big bores and way more capacities than what is listed in papers. So all spectators and fellow racers get cheated about extreme modifications. So anybody who sticks to near original specs will be frustrated by not dealing at roughly same levels and nobody admits what he´s done .</p><p> Some time ago I got asked about producing an extra hot camshaft for the 1928 BMW R 63 ohv 750 twins for classic racing. The guy would not tell me much about what origin his 750 had and what was done already on the engine, so a biiig secret about that bike. After some discussion about attitudes I was unwilling to take part in spectators and fellow racers cheating and ended that phone call. Remember Troy Corser beating a Manx with the R 57 from 1928 so you can imagine there is next to nothing in his engine made by BMW, it would expode at half that speed definitely.</p><p> My mods on the Vincents are no secret as most here will have seen for a while but then no racing is the motivation just a dead solid engine is the plan, no compromises for poor details.</p><p></p><p> Vic</p><p></p><p><a href="https://www.oerlikon.com/balzers/us/en/markets/motorsport-components/" target="_blank">Balzers coatings</a></p><p></p><p><a href="https://www.youtube.com/watch?v=yHNZaHcP3eg" target="_blank">Troy Corser BMW racer 1928</a></p></blockquote><p></p>
[QUOTE="oexing, post: 179156, member: 1493"] To be open, I would not have the balls to run titanium valves, maybe in racing for periodic exchanges. Same with alu conrods, great when you replace them each year or more often, the drag racing guys have them. Problem with titanium is the poor properties when in plain bearing applications, like in valve guides - I would not want to picture them in almost redhot conditions for ex valves. The Balzers company offers exotic coatings like shown in my link below. Vincent Speet may have tried some in his engines, cannot tell about experiences myself as I´d have to send parts somewhere and no job for home. While I can imagine finding a great coating for the valve stem I would not think there was a way to prevent wear on the seat of titanium valves. Typically you´d find sort of stellited faces for unleaded and Diesel valves for extreme mileages - kilometers too. But then, I don´t quite see the point of modifying old classics to these extremes so in the end there is not much left of the familiar character of the bike when it should be just the fun of having a great time on safe race tracks and producing sounds we remember from long gone times. After all, there is nothing to earn from that racing, just maybe a tin pot to collect dust at home. What I criticise most in these communities is the cheating about details in their engines: I bet most of them got big bores and way more capacities than what is listed in papers. So all spectators and fellow racers get cheated about extreme modifications. So anybody who sticks to near original specs will be frustrated by not dealing at roughly same levels and nobody admits what he´s done . Some time ago I got asked about producing an extra hot camshaft for the 1928 BMW R 63 ohv 750 twins for classic racing. The guy would not tell me much about what origin his 750 had and what was done already on the engine, so a biiig secret about that bike. After some discussion about attitudes I was unwilling to take part in spectators and fellow racers cheating and ended that phone call. Remember Troy Corser beating a Manx with the R 57 from 1928 so you can imagine there is next to nothing in his engine made by BMW, it would expode at half that speed definitely. My mods on the Vincents are no secret as most here will have seen for a while but then no racing is the motivation just a dead solid engine is the plan, no compromises for poor details. Vic [URL='https://www.oerlikon.com/balzers/us/en/markets/motorsport-components/']Balzers coatings[/URL] [URL='https://www.youtube.com/watch?v=yHNZaHcP3eg']Troy Corser BMW racer 1928[/URL] [/QUOTE]
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Crank build for racing engine
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