Originally Posted by seo

I know this is supposed to be a results-oriented forum, but thought this might be of interest to people who like diesels.
Q: There is an industrial diesel in pretty common use that has NO VALVES. No intake valves, no exhaust valves. How do they work this?

In the interests of sport, if you happen to know the engine I'm referring to, please don't just post the make and model, and spoil the opportunity for mental exertion on the part of others...
seo