NYT article - GM cylinder dropping

[eoa at spartek.com]

Try pulling the rocker arms as well as the plugs. Your just using the motor
as an aircompressor with the valves operating. The idea is to also let the
compressed air push the piston back down, not just blow out the exhaust.

>
> How come it's easier to crank an engine with all the spark
> plugs out (same
> as valves open) than it is with all the plugs in?
>
> Also, if you pull one spark plug, gas mileage decreases.  If
> that were the
> case, the other 7 cylinders would just pick up the pace a bit
> and efficiency
> wouldn't be lost.  Or, how about this?  Try turning an engine
> with a wrench
> BY HAND with the plugs in and out.  Which is easier?  I'm
> trouble with this
> explanation.
>
> Steve
>
> -----Original Message-----
> From: Ron Schroeder [mailto:rjs at bnl.gov]
> Sent: Wednesday, May 30, 2001 12:43 PM
> To: gmecm at diy-efi.org
> Subject: RE: NYT article - GM cylinder dropping
>
>
> At 09:11 AM 5/30/01 -0400, you wrote:
> >Hope it's a bit more sophisticated than that.  Shortening
> the lifters means
> >both valves are closed (non-OHC engine) which equals massive pumping
> losses.
> >(Try pulling one plug wire and then go check your mileage.)
> Seems like
> they
> >meant to say it "telescopes" the intake lifter but expands
> the exhaust
> >lifter so the exhaust valve stays open all the time.  Don't
> think you'd
> want
> >to leave BOTH valves open all the time.  Although, may create an
> interesting
> >EGR effect.  :-)
> >
> >Steve
>
>
> The lowest losses are with both valves closed.  The energy it takes to
> compress the air in the upstroke is mostly released on the downstroke.
>
> Ron Schroeder
> WD8CDH
> E. E. S.
> wd8cdh at bnl.gov
> rjs at bnl.gov
> ron at 112motors.com
> 631 344-4561 Day
> 631 286-5677 Nite
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