alternating valve engine

[Mustang Dave]

Jim, you're not related to Dave, are you?
I didn't think so.

[dcb]

I tried to do some figuring on the losses to the reciprocating mass of the valves, not sure how good I did but it came out to about .05 hp at 5000 rpm on a v8.

Pretty sure that doesn't account for doubling mpg.

And if that is $4mil in tax money, Jim damn well should be discussing it in public, IMHO. I'll make it my business.

[2000mc]

think i'll wait for a large scale version of these anyway

Camless 4 Stroke Cycle I.C. Engines with Solenoid Operated Valves.
index

[dcb]

Sure, if the valves take that little energy (comparatively) to open and close then let a computer control them and ditch the throttle.

[SVOboy]

Figured I'd post this just for fun. Evidently it's for sale "REAL CHEAP"

http://ecomodder.com/forum/attachmen...1&d=1251174442

Good reading for any cult member

[Frank Lee]

Common Misconception:
Many people mistakenly think that using higher seat pressures causes a reduction in the horsepower delivered to the flywheel because higher seat pressures (and also higher spring rates required for high performance) require horsepower to compress the springs. This thinking is simply incomplete! For every valve that is opening and its valve spring being compressed, another valve is closing and its valve spring is expanding. This expansion returns the energy to the valve train and the engine. This results in a net power loss of "0" hp. Many engineering texts refer to this as the "regenerative characteristic" of the valve train. Recent tests at Crane have shown no horsepower loss on a hydraulic roller equipped engine when changing the seat pressure from 135# to 165#. Power actually improved significantly at top end, probably due to better control of the relatively heavy valves in the engine.

Crane Cams

The Crane Cam boys have forgotten more about valvetrains than the rest of us will ever know.

[dcb]

unh... the patent number mentioned in that pdf is for something completely different, from like 1979?!?

Temperature actuated foundation ventilator - Patent 4290554

[2000mc]

The Whitmer 8 Cycle Engine uses only only one of the existing two intake valves opening and closing during the first two cycles and only only one of the existing two exhaust valves opening and closing during the next two cycles

so you leave an intake valve open for 2cycles.... wouldnt the second cycle be the piston moving up, pushing the air back out?

[SVOboy]

I think the concept is just that of a 4-cycle VTEC-E system except it alternates which valve is open, no that they're open longer.

[2000mc]

but then the individual valve would have to move just as fast, but only every other time

i thought he was trying to move the valves at half speed