Hybrid Car – More Fun with Less Gas

better mileage with higher octane? - Page 13

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Posted by Gordon Richmond on January 5, 2007, 1:56 am
 

I'm not far from you, about 10 miles by road, in the vicinity of Trochu. AAMOF,
I have to
go to Three Hills tomorrow to attend a funeral.

Gordon Richmond (lurker and rare poster here)


Posted by Venus on January 4, 2007, 11:44 pm
 
Dan,
You seemed to know what you're talking about.  Me too I have seen what you
described, however there is a way to control the Detonation into a
controllable burn.  And the trick is, I can't share until I get paid for my
research.  The saving is huge.

Venus




Solar Flare wrote:

  Mustn't confuse detonation with normal combustion. The fuel/air
mixture should burn across the chamber at about 100 feet per second.
Detonation is a different process and flame fronts can reach 5000 fps
or more. The enormous pressure spikes and abrupt release of heat does
plenty of damage.
      Detonation happens when the complex fuel molecules, under the
rising pressure ahead of the flame front of normal combustion, begin to
break down into simpler structures that can autoignite; they don't wait
for the flame front to set them off in a normal chain reaction. The
whole works might go off at once just becuse they're being squeezed and
their temp is rising.
      Detonation requires time for those molecules to break down, so
low RPM is a problem, large combustion chambers (which require more
flame-travel time) are a problem, lean mixtures (which burn more slowly
due to the distance between molcules) are a problem.
       Normal combustion is not an explosion; it's a controlled burn.
Detonation is an explosion, totally uncontrolled, and higher octane
fuels were designed to increase the capability of handling the higher
pressures and temps without breaking down into autoignitable
components.
        In aircraft we're still using leaded fuels because the engine
technology is stuck in the 1950s. Some avgas grades have large amounts
of lead in them, and sparkplug fouling is a big problem, even in the
heat of an aircooled engine. Those amounts of TEL are necessary for the
big cylinders found on aircraft engines, their low operating RPM, and
the higher operating temps (cylinder head temps to 550F, depending on
the engine).
        We've been promised unleaded avgas for some time now but
haven't seen it yet.

        Dan



Posted by Bob on January 5, 2007, 2:05 am
 Gee Mr. Venus, where should I send my money? Do you have a paypal account or
should I send cash? I'll bet you have that perpetual motion thing figured
out too.




Posted by on January 7, 2007, 6:22 am
 

Cheese Bob makes you think I am lying?  You see, you guys have enormous egos
and you think no one else could come up with the right answer except
yourselves.  When the Chinese launched their Space program you thought they
bragged, and they did go into space, and many countries in Europe can do
what you did.  Insulting people won't get you any where.





Posted by Slobo on January 7, 2007, 10:45 am
 

Venus is posting as  a  fake  Komin in other  discussion groups .


Venus wrote:


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