Guest johnny1913 Posted December 28, 2003 Share Posted December 28, 2003 Desmodromic valve opening and closing does not use valve-springs to close the valve, but uses another lever instead. So it uses a lever to open the valves and to close the valves. The system is used in Ducati motorcycles because it produces less loss due to valve-springs, valve float is destroyed and the engine can rev higher, therefore producing more horsepower. So, now I ask you, why don't we use that valve system in our engines today? Quote Link to comment Share on other sites More sharing options...
Drax240z Posted December 28, 2003 Share Posted December 28, 2003 Answer: $ Quote Link to comment Share on other sites More sharing options...
SpeedRacer Posted December 28, 2003 Share Posted December 28, 2003 The Desmodromic valve system was used on the old (1954 I think ) Mercedes Benz W196 Silver Arrow Grand Prix (Formula 1) cars. It is very expensive and difficult to adjust properly. On a current F1 car it would not be able to handle the high RPM's. Current F1 engines rev to 19,200 RPM and use no valve springs but compressed air to shut the four or five valves per cylinder. You could use a Desmodromic valve system in a street car but it would be very expensive with little gain. Remember, the rest of the engine has to be engineered to handle the high RPM limits as well. Quote Link to comment Share on other sites More sharing options...
Guest Zachb55 Posted December 28, 2003 Share Posted December 28, 2003 yeah, look at all those moving parts!!! and current systems have way too many. you should look into Spherical Rotary Valves if your willing to pay some bucks for something that will really improve your car. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted December 30, 2003 Share Posted December 30, 2003 $ is rigt - anyone priced a valve adjustment on a DUC? Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted December 30, 2003 Share Posted December 30, 2003 WAIT WAIT WAIT!!!! I think we are all forgeting something VERY important, money is not really the issue here... Ducks sound soooooooo SWEET! Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted December 31, 2003 Share Posted December 31, 2003 Hard for me to believe such a system would consistently form a tight valve seal without some type of spring/flex system. If the valve is closed by purely mechanical means, then temperature changes alone will require constant adjustment. Maybe the rocker arm itself flexes somewhat? Quote Link to comment Share on other sites More sharing options...
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