F1 engines still have camshafts but no valvesprings.
Renault was first and the others followed. They use
air- or oilpressure to close the valves. Regular valve
springs don't function properly above 13-14000 rpm
in those size engines. Smaller displacement engines
can handle more rpm as they use smaller valves.
Thomas
datsunmike wrote:
> And let's not forget cost and reliability. I think Renault F1 engines
> operated with pneumatic actuated valves.
>
> Mike
>
> ----- Original Message -----
> From: "Gary McCormick" <svgkm@halley.ca.essd.northgrum.com>
> To: "Mitch Planck" <mitch@ias.net>
> Cc: "'Datsun Roadsters'" <datsun-roadsters@autox.team.net>
> Sent: Wednesday, January 16, 2002 3:14 PM
> Subject: Re: Variable Valve Timing anyone?
>
> > That has been in the works, or at least under investigation by various
> interested parties,
> > for over a decade. The hitch lies in developing a fast-acting solenoid or
> other
> > controllable actuator that develops sufficient force.
> >
> > Gary McCormick
> > San Jose, CA
> >
> > Mitch Planck wrote:
> >
> > > I agree - why can't you use a computer controled solonoid or something
> along
> > > those lines to actuate the valves?
> > >
> > > Mitch Planck
> > > Chelsea, MI
> > > '69 1600
> > > '70 1600
> > >
> > > -----Original Message-----
> > > From: owner-datsun-roadsters@autox.team.net
> > > [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Thomas -
> > > Sweden
> > > Sent: Wednesday, January 16, 2002 2:40 PM
> > > To: Gary Boone
> > > Cc: Datsun Roadsters
> > > Subject: Re: Variable Valve Timing anyone?
> > >
> > > Wait a few years and there will not be any camshafts
> > > in the engines.
> > >
> > > Thomas
> > >
> > > Gary Boone wrote:
> > >
> > > > 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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