That settles it , I've got to say something. I run on the
discarded
cooking oil after simply filtering it. The previously
mentioned
process
seems a waste of time and effort to me. This way I burn
the lot
rather
than splitting off the glycerine.
Certain modifications are required to deal with starting
problems
due to
the lower cetane rating ( the inverse of octane ), and
viscosity
problems in relation to the fuel filter. Was costing me
about
2.5 cent
a liter, a bit more now since I'm not getting
canola, but
some
sort of
blend which has very fine brown particles from oxidation
when I
get it.
They clag up my filters quicker if I don't let it
settle long
enough and
decant the clear stuff.
John Evans
Think logically and do things well. Think laterally and
do things
better!
Very good John. I guess you don't live in California... I
used to
believe the tree hugger regulations there were really
for the
environment until they outlawed your completely renewable
form of
energy
on the road :-)))) I had 3 sources available until my
diesel left
with
my ex-wife in the divorce.
Dave Arbogast
I guess we're somewhat off topic Dave, but I'm sorry to hear
you lost
your diesel when you gained your freedom, I guess you can't have
everything!
My wife won't let me use the good stuff in our diesel car, she's
embarrassed that kids in following vehicles will think they
can smell
McDonalds!
I noticed an assertion that the oil will carbon up the engine, I
see no
evidence of this , and believe this is unlikely as there is
no black
particulate emission in the exhaust.
I notice that our legislators intend to tax "biodiesel" from
2011, it
will be interesting to see if they cast the net wide enough
to cover
waste oil.
Meanwhile I'll keep using it in the Coaster.
John Evans.
Think logically and do things well. Think laterally and do
things
better.
John, I have a fuel selector and once my engine is warmed up, I
switch to
straight oil and then switch back to diesel when I'm going to shut
down to
avoid coking my injectors. Coking seems to be the main objection to
running
straight oil but I've seen no hard evidence to support this-have
you? Also,
I'm aware of the effect that propane injection has on diesel
fuel, has
anyone tried this on veg oil? More HP and more complete burn
while less
coking??? Your thoughts?
Andy in CO
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G'Day Andy, I too started out switching between a tank of diesel and the
one containing oil, but that was to avoid starting difficulties, I must
have done something like 50,000 Km on oil before that engine cracked its
head due to a series of 3 overheats caused by a new but defective water
pump. It was a Toyota 2B diesel.
I replaced it with a 14B Turbo engine which is direct injection and so
starts more easily on the lower cetane rated fuel.
On pulling the head off the 2B engine I saw no evidence of anything
untoward so far as coke was concerned, and the performance of the
injectors appeared unaffected.
The 14B engine has now done about 40,000Km on oil. While it starts a
little better and idles a bit smoother on diesel I can't tell the
difference power wise.
I am aware of the use of propane in diesels, but I don't know much about
it. I know it has a fairly high octane rating - about 110 I think, but
would need to be injected into the induction tract in quantities small
enough to stay lean of detonation in a diesel. I don't see any reason
why it wouldn't work well with oil.
I have been told that we will be moving to low sulfur diesel soon, and
that its lubricating properties may be a problem for older diesels, they
will need an additive to avoid excessive wear in the injector pump. The
oil appears to be a very good lubricant.
John Evans.
OK guys this is not really related to rotaries so please take
it to the appropriate place.
Paul Lamar ...No rotor no motor.
Actually Paul, what I wanted to get to in this context was some
discussion as to whether or not the rotary could ever be developed into
an effective diesel. It would seem to have a problem achieving a
sufficiently high compression ratio for compression ignition. Perhaps it
could be started as a spark ignition engine, and once running and using
forced induction compression ignition could be possible.It would be very
nice to be able to fly on renewable vegetable oil fuel.
Is there any information available on diesel rotaries?
John Evans
Think logically and do things well. Think laterally and do things better.
Well yes that is a valid subject. The geometry of the rotary
does not allow high compression ratios required by true diesels.
As you reduce the depression in the rotor face to raise the compression
ratio the shape of the combustion chamber becomes less and
less favorable. Turbo charging or super charging mitigates
that somewhat as it packs more air into the
combustion chamber increasing the effective over all compression
ratio.
Rolls Royce built a compound rotary that had two parts.
The first part (which incidently just happened to be another
Wankel) was to raise the pressure of the air before
it was transfered to the power Wankel. As far as I know
RR never published the results but they did abandon the project.
These pics are not a real RR diesel engine but just a mockup.
Wankel Germany Gmbh built some small turbo charged direct high
pressure injection engines that would run on diesel fuel but they
were not true diesels. A spark plug ignited the mixture. IMHO it was
very difficult to get complete combustion so the BSFC and power
was nothing special.
Francois on here could update his progress as he is attempting
to do the same thing with the Mazda. Last I heard it was generating
75 HP running on diesel fuel and as I recall.
Paul Lamar ...No rotor no motor.
John
As someone who is running several vehicles on biodiesel now and next summer
all lawn equipment on ethanol, flying on renewables is a given for me..
However ethanol seems to have the most advantageous in aviation presently
and especially with high compression engines.
Doug in Japan
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http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.