forget your cams, theyre worthless.......

[merlot566jka]

a good idea none the less.....

[Joseph Upson]

I don't see the benefit to reducing pollution as far as the sales pitch was suggesting if they are still planning to use gasoline. Cars are already doing a great job of it thanks to VVT and its elimination of the EGR.

I believe a more efficient approach would be a design that uses the engine oil to hydraulically operate the valves given they are using it to activate VVT and DOD already.

An even more effective method to improving efficiency is if they could some how use direct injection to help turn the 4 stroke motor into a 2 stroke.

[gectek]

yah, have you seen how "efficient" a DI diesel engine is...they are 2 stroke. using oil and gas mixed together? not a good idea. more pollutants. plus 2 strokes make very high cc temps, increasing oxides of nitrogen...they already put out too much as it is. increasing cy pressures and temps and running lean so the DI can work right. that doesnt sound like anything going in the green direction to me

[geoffinbc]

You can make a 2 stroke gas engine without mixing oil. That's easy. The problem is getting a power stroke and then the exhaust and intake even on the same down stroke. There is always raw fuel that will escape out the exhaust meaning more pollution. A DI engine could help eliminate this by injecting fuel only when the exhaust port is closed or covered but you still have a bad savaging problem. A 4 stroke engine makes for a clean cylinder and good conditions for a new cycle to begin over again.

[kflo 93 gt]

What about Formula 1 race engines? They have used pneumatically activated valves for years, and they turn some insane rpms for the duration of a race. Not saying it would work for true longevity, but in an engine that only sees say 6500 rpm redline perhaps it could be constructed to last for a long time...

My post feels very childish compared your your guys', sorry. hahaha

[merlot566jka]

Not a childish post, it fits here, but what renault has on their engine is pnumatic dampened valves. Their valve springs were replaced by small piston style chambers of nitrogen. Once the valve is pushed down, the champer of gas is compressed and acts very much like a spring, without the harmonics. Its allowed them to rev extremely high.

[geoffinbc]

Agreed F1 engines basically use a conventional valvetrain but are glorified with advanced technology.

[gectek]

well they are expensive way beyond the common man can afford, that is the actual engine blueprints that are released. the designs on the new ones arent even open for general public viewing