"Parlow, Eric (Turbos-Asheville)" wrote:
Does a diesel rotary exist?
ERic--
No. But a direct injection turbo rotary will run
on diesel fuel. http://www.wankel-rotary.com/
Not a true diesel.
Paul Lamar
Why would direct injection be needed if spark ignition is used?
Charlie England
I suppose to get a rich enough mixture around the spark plug.
I don't really know. I notice on the web site they are also
claiming they can burn diesel without a turbo charger.
That is a bit surprising to me. I assumed the extra heat
in the intake charge due to the turbo compression was
necessary to make the diesel fuel volatile enough to
ignite in the first place. Perhaps the secret is a high
energy ignition system. Come to think of it I did see
an intercooler on their engines. That confused me a bit at
the time.
The power and the BSFC is no great shakes. If you are thinking
of better fuel consumption forget it. If you are burning
farm fuel and not paying taxes on it that is another matter
entirely.
Paul Lamar
Because of the low effective octane rating of diesel fuel it is almost
impossible to prevent detonation with a homogeneous charge as one would get
by throttle body fuel injection or carburetion. We have found that anything
below 10,000 psi direct injection can have problems with particulate
production, detonation and/or ability to get the right amount of fuel in
near top-dead-center. We achieved our best success using the new 20,000+
psi pump and electronic injection system use on the small diesel powered
cars in Europe (Bosch system). Unfortunately, these components are not
available in the U.S.
After cooling is primarily used to increase the volumetric efficiency
although it helps somewhat with detonation.
-Paul Moller-
Thanks for sharing that with us Paul. Perhaps direct injection of
gasoline will reduce the chances of detonation with turbo rotary
engines as well.
BTW have you seen the Ford 10,000 psi electronic injector?
Here too are some of my early ideas on the subject.
Paul Lamar
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