GM has brought it back . They are calling actrive fuel management. They are
using it in the V6 and V8 motors in the suv and truck lines. Basically it's
a hydraulic roller lifter with a locking pin that allows them to collapse
the lifter. They use a bank of electrically activated hyrdualic valves
mounted in the lifter valley to control the locking pins. The lifter itself
is a highly complicated piece with very close tolerances and very diificult
to produce.
Bill
----- Original Message -----
From: "Jon Bishop" <jon.the.wise@gmail.com>
To: <FastmetalBDF@aol.com>
Cc: <Land-speed@autox.team.net>
Sent: Sunday, September 02, 2007 11:31 PM
Subject: Re: [Land-speed] Electrical Solenoid Valve Actuation ? YES.
> On Sep 1, 2007, at 4:03 PM, FastmetalBDF@aol.com wrote:
>
>> Electric Solenoids operating valves on an internal combustion engine,
>> you
>> ask ??? How about the Cadillac model a few years back with rockers
>> controlled
>> by electrical signals so it could cruise on 4 cylinders after getting
>> up to
>> speed on 8, and then 6, as it approached cruising speed ? Wasn't it
>> referred
>> to as the 4-6-8 Cadillac Mileage Motor ? Another Motor Marvel
>> relegated to
>> the dustbin of 20th Century Wonder Cures for All that Ails Your Auto ?
>> At
>> least this one got put into production ..... Was it not a success ?
>> Too much
>> maintenance involved ? Bruce, recalling waaaay back in my pre- teen
>> years
>
> It tanked. I guess the theory was good, but tech wasn't up to the job
> yet, so the motor ran poorly on 4 and 6, had little or no power at that
> range, and then was still a gas hog (which is what the 4-6-8 design was
> trying to solve)
>
> All new Chrysler Hemis run on a similiar "displacement on demand" design,
> 4 cylinder cruising with v8 power. They average 20mpg.
>
>> <snip>
>
> ~Jon
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