[DMCForum] Re: Engine Vacuum -- Clarification
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[DMCForum] Re: Engine Vacuum -- Clarification



Engine vacuum created by INTAKE stroke of piston. Downward power
stroke does not create vacuum, so no flames please...

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> Engine vacuum is created by downward stroke of piston. When throttle
> plates are letting very little air into engine, is high. As plates
> open, vacuum created goes down.
> 
> I'm not the first person to notice this BTW.
> 
> Car companies have harnessed engine vacuum for decades to power all
> sorts of interesting devices. Even JZD used it to boost brake pedal
> action and open & close HVAC vents. 
> 
> Was this a trick question?
> 
> Bill Robertson
> #5939
> 
> >--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx>
wrote:
> > 
> > 
> > content22207 wrote:
> > 
> > >At small southern dirt tracks most people race very simple hopped up
> > >domestic blocks (is a fellow in town here racing scratch built car
> > >with a Ford 141 -- Pinto motor). Are specific rules for cubic inch
> > >displacement, NOS injection, etc. Have NEVER seen anything remotely
> > >similar to your little Euro cars. With all due respects think they'd
> > >be laughed off the track.
> > >
> > Think you'll find S2000 is Japanese. American cars and their fans
live 
> > inside their own little bibble* as far as the rest of the world can
> see. 
> > Except the Icelanders who have invented "Formula Off Road" - the only 
> > motorsport I've ever been motivated to watch because it's so crazy. 
> > Makes your monster trucks look very gay.
> > 
> > Icelandic bloke: "Look over there - a cliff. I wonder if we built
a car 
> > with big enough wheels and big enough engine, could we drive up it?"
> > Icelandic bloke's mate: And look there - a river. Maybe with the
right 
> > tyres, we could take the same car and with enough speed, aquaplane 
> > across it before we sink?"
> > Some guy walking past: "How about an obstacle course around a quarry 
> > with 80 degree walls - three-point turns and suchlike - the winner is 
> > the person who gets the furthest without rolling or flipping over or 
> > whose engine doen't blow up first?"
> > 
> > But I digress....
> > 
> > * That was actually a typo - I meant to write "bubble" but it
> strikes me 
> > as a very good word to descibe how you waffle on <tongue in cheek>
> > 
> > How does your friend "run vacuum"? Are we talking engine vacuum? The 
> > same engine vacuum that disappears as you put your foot down? What
are 
> > you talking about?
> > 
> > Martin
> > #1458
> > #4426
> > Haven't written them for a while.
> > 
> > >
> > >BTW: This fellow is one who told me he only runs a couple inches of
> > >vacuum and thus has no advance on distributor (and yes, I do believe
> > >he uses MSD module for that). Has trophies all over office, so I
trust
> > >his word.
> > >
> > >He runs horrifically advanced timing, but also rev's 3500 to 9000
RPM.
> > >
> > >BTW: Have you ever noticed all the different spark retarders MSD
> > >sells? Hmmm, what do you suppose those are for? Could it be to start
> > >an engine that is otherwise over advanced...
> > >
> > >Bill Robertson
> > >#5939
> > >  
> > >



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