Re: Inneresting gas-saving factoid


"Winston" <Winston@xxxxxxxxxxxxxx> wrote in message
news:h19u2h065o@xxxxxxxxxxxxxxxxxxxx
Proctologically Violated©® wrote:
"Leo Lichtman" <leo.lichtman@xxxxxxx> wrote in message
news:miZZl.19$iz2.9@xxxxxxxxxxxxxxxxxxxxxxx
<clare@xxxxxxxxxxxx> wrote: (clip) Open any one valve and it becomes a
brake.
^^^^^^^^^^^^^^^^^^
Yep. That's how the compression release worked on my old Yamaha enduro,
and, I believe, on those big trucks you hear decelerating by releasing
compression.

That's just downshifting/engine braking. They're not messing with
valves, afaik.

But they are, PV:

http://en.wikipedia.org/wiki/Jake_brake
http://www.youtube.com/watch?v=z3bLqjPBlx8


OK, I think I got it:
Yyou allow the engine to compress, but by opening the valve at full
compression, you don't get any of the "spring back" from what was
compressed....
OK....

So Jon is also saying that *leaving* the valves open the piston will still
experience more drag than leaving the valves closed? At above 1,000 rpm, at
least.... Tough notion to get used to, but I guess that's what CdA is all
about, eh?

Live and learn....
Now I'm going to have weird dreams.... always happens when my intuitive
reality is disturbed....

--

Mr. PV'd

Mae West (yer fav Congressman) to the Gangster (yer fav Lobbyist):
Hey, Big Boy, is that a wad (of cash) in yer pocket, or are you just
glad to see me??






--Winston



.

Relevant Pages

  • Re: Reluctant Guzzi
    ... and a spark at plugs, ... exhaust valves are closed. ... Compression, ignition, carburation. ... if the idle jets and possibly starter jets are furred up. ...
    (uk.rec.motorcycles)
  • Re: Small engine rebuild update.
    ... If you got those in the wrong hole, the valves are NOT adjusted. ... dont think this has a compression release". ... checked the gap between the lifter and top of the valve stem. ... I think you have switched the lifters. ...
    (rec.crafts.metalworking)
  • Re: Small engine rebuild update.
    ... I mixed up the lifters as they fell out before I could figure ... If you got those in the wrong hole, the valves are NOT adjusted. ... dont think this has a compression release". ... checked the gap between the lifter and top of the valve stem. ...
    (rec.crafts.metalworking)
  • Re: Reluctant Guzzi
    ... patrick cast forth these pearls of wisdom ... exhaust valves are closed. ... Compression, ignition, carburation. ... Like the older Rover engines, a good one always sounded like the starter ...
    (uk.rec.motorcycles)
  • Re: Small engine rebuild update.
    ... If you got those in the wrong hole, the valves are NOT adjusted. ... dont think this has a compression release". ... checked the gap between the lifter and top of the valve stem. ...
    (rec.crafts.metalworking)
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