High economy, was Fuel injection plugs

[Howard Wilkinson]

Gary:
    The Sandia type engine (variable displacement) I mentioned would
eliminate the need for extreme gearing to accomplish this...too bad
they don't build them.   H.W.

-----Original Message-----
From: Gary Derian <gderian at oh.verio.com>
To: diy_efi at efi332.eng.ohio-state.edu
<diy_efi at efi332.eng.ohio-state.edu>
Date: Friday, April 30, 1999 5:30 PM
Subject: High economy, was Fuel injection plugs


>With a CVT, you need a map of power and BSFC vs rpm and throttle.
Then you
>operate the engine only at the highest BSFC values for a given power
>requirement.  It is not so simple as WOT all the time but pretty
close.
>When power requirements are low, the engine would operate at very low
rpm
>but nearly WOT.
>
>Years ago (20) I achieved 61 mpg on a Vega at a fuel economy rally
using
>economy techniques.  I set the carb for lean WOT and lugged the
engine in
>high gear only from 20 mph to 40 mph.  At that speed I turned off the
engine
>and coasted.  At 20 mph, I engaged the engine again and lugged up to
40 mph.
>It really surprised all the guys in VW Rabbit Diesels.  I had the car
>ballasted to 3800 lb  to maximize the ton-miles per gallon and still
got 61
>mpg.  This was on a 100 mile loop.
>
>Van Dorne has built a CVT for the Williams F1 car that could handle
700 hp.
>
>Electric or hydraulic drive allows the engine to operate more
efficiently
>but the drive train loses efficiency compared to a direct mechanical
drive.
>Mechanical to electric to mechanical is at best 75%.  Hydraulic has
high
>losses at high speeds.  The one advantage for electric with a small
battery
>and small engine is regenerative braking and the ability to turn off
the
>engine for short periods of driving.
>
>Gary Derian <gderian at oh.verio.com>
>
>