14-4-2000
I hear that they are experimenting in Australia with running diesels on
compressed natural gas. Wonder what compression ratio they're using?

I believe this is a commercial trial preparatory to making the system
available publicly.

Here in New Zealand there are a lot of vehicles running on liquid propane,
but CNG isn't generally available for cars.

Imagine, a diesel that doesn't smoke or turn its oil black with carbon
particles. And that doesn't need 5000km oilchanges (though Nissan's new
DOHC 4-valve diesels have centrifugal oilfilters that remove all the
carbon, and have 15000km oilchange intervals).