Electro-magnetic valves

[Ade + Lamb Chop]

At 10:37 31/01/00 -0700, Greg Hermann wrote:
>>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!

Yes but think how much power the cam drivetrain loses... Big heavy springs,
cogs, belts/chains. It cannot be that far off 5HP.

Ade

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