The Future of the Internal Combustion Engine Is Camless

[The_Chupacabra]

I don't think they do that for air. It would take too much energy to move that much air and a hell of an injector to be able to move that much volume. If they did and then if and when it fails nothing would happen. AFM disables the valves and injectors on half the engine and all eight pistons move up and down just fine.

Doesn't AFM open the valves still as to not have a lot of load on the half of the engine not doing any work?

 

[mr_bots]

Nope. The lifters on 8 of the pushrods collapse preventing the cam from activating those valves and the fuel injectors are disabled. I believe GM claims it balances out because its compressing one cylinder with trapped air as its uncompressing another. Pushing clean air through the exhaust wouldn't be very good on the cats and jack up the O2 sensor readings making balancing the fuel/air ratio more difficult for the PCM.

 

[cRiPpLe_rOoStEr]

Maybe in the future there won't be intake valves either, Have an injector that does fuel and air together and have just one large exhaust valve per cylinder.

That wouldn't be viable in a 4-stroke engine.