Electro-magnetic valves

[Greg Hermann]

>Yamaha has a prototype 250 cc. with 4 (2 inlet 2 exhaust)
>electromagnetic valves being dyno tested at the University of California
>at Riverside. It's an interesting idea but it takes quite a control
>system to manage the valves and a large (150V 30A) DC power supply. I
>think there's an SAE paper on this but I can't find the reference at the
>moment.
>
>Hope this helps,
>
>Mac

Gee--4500 watts to run the valves. That's about 5.5 HP. A pretty
significant portion of a 250 cc's output, But it takes a significant amount
of power to drive a camshaft, too. What is more significant is that the
efficiency losses in the generator and the solenoids are probably at least
1.5 HP!

Greg


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