Direct Injection Gas Engines
With the trend to direct injection gas engines what happens going down a hill on compression. Diesel engines without intake butterflies have little hold back on compression, so I assume that gassers w...
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I believe any current production gas engine will need to maintain a fairly consistent air/fuel mixture to avoid running lean which will lead to emissions issues. They will all either have a throttle plate or have more significant control over the intake valves which can act as a throttle by keeping them mostly closed. BMW probably leads in this technology although I'm not sure how widespread it is in production.
There is talk of making gas engines that will operate more like a diesel under certain load conditions. They are being tested. Homogeneous-charge-compression-ignition (HCCI)is what GM calls it. It would probably still have a throttle since it is spark ignition much of the time.
There is talk of making gas engines that will operate more like a diesel under certain load conditions. They are being tested. Homogeneous-charge-compression-ignition (HCCI)is what GM calls it. It would probably still have a throttle since it is spark ignition much of the time.
