This is what BMW has now on its new 745i. No throttle body, just controlled
opening of the valves, thru a cam on a cam, totally mechanical system. All
the fuel injection and the 2nd cam action is controlled electronically.
Another side-step toward no cam.
Scott
'69 2000
'85 BMW M535i
----- Original Message -----
From: "James Moore" <james.moore14@worldnet.att.net>
To: "Gary Boone" <gboone@sisna.com>; "Datsun Roadsters"
<datsun-roadsters@autox.team.net>
Sent: Wednesday, January 16, 2002 8:45 PM
Subject: Re: Variable Valve Timing anyone?
> Electronically operated valves have one major drawback...noise.....ever
sit
> and listen to a modern fuel injected engine? Those injectors make a heck
of
> a racket. And those are just little pintles slamming shut. Imagine what a
> sound those valves would make slamming shut.
> The hurdles of electrical power are being overcome with 42V systems, which
> are coming into production with 2003 model year I think.
>
> There are many more things that can be gotten rid of with electrically
> operated valves besides cams. Throttle plate, for instance. Engine speed
and
> power can simply be varied by leaving the valves open longer or
> shorter...has the same effect...The starter...just open a valve..inject
some
> fuel and ignite it...the combustion without pressure is sufficient to turn
> the engine....or some manufacturers are using a combined
> alternator/starter/flywheel. If they can get the noise problem
solved....the
> latest thought is if they can control the current finely enough to have
the
> valves slow down as they seat....
>
> To paraphrase Mark Twain (I think) "The death of the internal combustion
> engine has been greatly exaggerated".
>
> Jim Moore
> 69 2000 RHD
> Dunkirk MD
>
> ----- Original Message -----
> From: "Gary Boone" <gboone@sisna.com>
> To: "Datsun Roadsters" <datsun-roadsters@autox.team.net>
> Sent: Wednesday, January 16, 2002 2:28 PM
> Subject: Variable Valve Timing anyone?
>
>
> > Here's an interesting idea for an upgrade to the roadster engines. It's
> > already possible to have electronic ignition and fuel injection on an
> > original roadster engine, so might as well make it modern, high tech all
> > the way :-).
> > Actually, this is pretty interesting. If there was enough interest, the
> > company developing it would make it for roadster engines, or so they
> > say. Check it out:
> > http://www.aatap.bigstep.com/
> >
> > Gary Boone
> > '70 2000
> > '79 280ZX
> >
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>
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