[Diy_efi] Intro, and q's about fuel economy

[Perry Harrington]

On Mon, Dec 16, 2002 at 10:49:27AM +0100, Alexei Pavlov wrote:
> pedward at apsoft.com wrote:
> > 
> > > What the EGR really does is reduce the pumping losses at cruise due to
> > > throttling.
> > 
> > It's simpler than that.  The exhaust gases already have fuel in them to
> > some degree.  You recycle that in place of actual fuel.  The only way to eliminate
> > throttle losses is to have no throttle at all.  You then do the throttling via
> > modulation of the valve timing.
> 
> Could you explain why there are no pumping losses with variable valve
> timing or clearance ?
> I see variable valves exactly like throttles, the piston still has to
> pump the vacuum to reach the BDC. The energy loss is still here.

I didn't say pumping losses, I said throttling losses.

--Perry

-- 
Perry Harrington			Data Acquisition & Instrumentation, Inc	
perry at dainst dot com					 http://www.dainst.com/

Those who would give up essential liberty to purchase a little temporary safety
deserve neither liberty or safety. Nor, are they likely to end up with either.
                             -- Benjamin Franklin

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