In message , D.P.Round
writes
Of course using direct injection you could raise the compression
because the fuel need not be there until you want it to go bang. So
raise the compression of your petrol engine a fair bit and inject the
fuel at the right time. No need for a spark any more... and you have a
diesel engine
Sorry, that's already been tried. NATO wanted a fleet of tanks to run
on any fuel but it turned out that as the fuel got thinner the mpg went
down very quickly and it was found that using petrol in this way diluted
lubricating oil on the cylinder walls leading to higher ware rates.
Further remember direct injection of petrol in cars has been around
since the 1950s, plenty of time for development, but very little done.
--
Clive