On Sep 2, 2007, at 11:35 PM, Ed Weldon wrote:
> well below 2000. All you'd need would be a 2nd distributor with motor
> comutators and brushes switching the solenoids backward and forward
> and
> maybe some special attention to keeping them cool so the insulation
> wouldn't
> burn up after prolonged operation since you'd want to keep them
> "on" to hold
> the valves open or closed as required. Timing changes would
> require just a
> bit of creativity in design and building of the comutator segments
> and the
> brush mountings.
That's an interesting idea, sounds like the first steps in a
mechanically controlled system... I think these guys at Sturman are
using a computer and some hydraulics to perform this operation.
> I'm sure the project would climb Pikes Peak in first gear; but it
> would be a
> slow trip.
> It wouldn't take a rocket scientist to put this thing under digital
> control
> with a speed sensor on the crankshaft and some transistors and
> solid state
> relays taking computer output and turning it into switching the
> solenoid
> driver currents. Might be a bit of a challenge synchronizing this
> with the
> throttle and some dampening so it doesn't fight with the valve
> control.
> Classic control problem.
Yeap, and I think that they have managed to resolve this issue, but
again, their site only shows limited info, so I couldn't say for sure.
> Now developing this to the point of threatening an H or G gas
> record.......That's a whole different story.
> Ed
See, that's what I'm wondering about, cause according to their site,
they've gotten engines to run 15,000 rpms in Jettas and
Internationals (at least one of each) so, the first question I have
then, is this a diesel only application, or have they got it working
well with both gas and diesel? (the jetta could be either) And
finally at 15,000 rpms, what kind out output are they making?
<http://www.sturmanindustries.com/main/hydraulicValveActuation.htm> :
> In 2000, we drove one of our Camless vehicles to the top of Pikes
> Peak. In the same year, we took a Camless vehicle on a 10,000 mile
> U.S. tour. We have operated vehicles from a Camless VW Jetta to a
> Camless International semi-truck and have run our systems up to
> 15,000 rpm frequency.
Guess I can just hope for a response to my email and see for myself,
because the idea of being able to dyno tune my valve timing right
along with my fuel and ignition on my laptop gives me both wet dreams
AND nightmares to think about. :-)
~Jon
>> On Sep 2, 2007, at 9:59 PM, Ed Weldon wrote:
>>> I looked over Sturman's website. ......
>
>> I don't disagree, but it would appear they do have working vehicles
>> built, if only proprietary systems, it's a start at least.
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