Thread: Bye bye bumpstick

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Forget duration, ramps, lobe radius, et al!

http://www.sema.org/main/semaorghome.aspx?id=54220

Wow. No lifters, no rockers, no press in studs, no screw in studs, no roller this or that, No oil seeping in the combustion chamber through the valve stem, no friction. Infinate valve control. I like the idea. It has merit.

combination starter alternator MY 1917 model T has a combination starter generator system will the camless system actuall make it to production???

Originally posted by Corvette64
Wow. No lifters, no rockers, no press in studs, no screw in studs, no roller this or that, No oil seeping in the combustion chamber through the valve stem, no friction. Infinate valve control. I like the idea. It has merit.

i agree, somebody will find a way to get more sound out of it and power.

it would be great to alter lift and dur. proflies with out taking it apart. race on saturday drive to church on sunday

wenpen

Not only do you have "infinite" variable valve timing, but there's no drag from the set of bearings, the lifters, timing drive, so more power/fuel economy. With a little program tweaking you can set it to radical for "performance bursts", and then dial it back for a leisurely drive home.

So now Mike I can see you recording the lifter noise from an old solid lifter cam on an MP3 or Ipod and broadcasting it from your underhood speaker system to scare the little kids. Ain't technology grand?

Originally posted by Bob Parmenter
Not only do you have "infinite" variable valve timing, but there's no drag from the set of bearings, the lifters, timing drive, so more power/fuel economy. With a little program tweaking you can set it to radical for "performance bursts", and then dial it back for a leisurely drive home.

So now Mike I can see you recording the lifter noise from an old solid lifter cam on an MP3 or Ipod and broadcasting it from your underhood speaker system to scare the little kids. Ain't technology grand?

I've been doing that for a long time already. the blower motors I ran for the last 20 yrs. idle smooth, i dont care what kind of cam I put in it.

i've already driven some vehicles with prototype setups using sylenoids instead cams ect.... GM is already starting to expirment with them and has given my junior college a few motors to play around with..... we've been having a few lag problems over 5500 RPMs, but our GM rep already told us that thats a bug they're working out....

Wow, if they can get that right, talk about solving a multitude of issues associated with a valve train !!!!!!!!! Where's my laptop, I want to change cams !!!!

how fast you go, depends on your laptop.

This concept and others like it have been around for awhile. Now that power electronics are getting more and more power dense it is becoming more feasible and practical.

Just remember there's no free lunch. Electromagnets have their own set of special issues realted to operating temperature, environment, and insulation life. And the energy/power required to operate the electromagnetic is not free either. It will likely come from the crankshaft and a higher performance alternator.

Developing electromechanical prototype machinery for a living, I for one would need to see a comprehensive performance and reliability trade study and energy balance and of course cost perspective before before I got too excited ...............

But it's still neat. A much more compact version BTW is in the form of a self contained solenoidal actuator ................

Regards, Kitz

GM had the basic idea/solenoids in the 70's - the Cadillac 4-6-8.
The solenoid moved the fulcrum point of the rocker, not allowing the valve to open. Problem was that the computer tech. (Bendix), wasn't ready for the systems that the engineers were coming up with. Now, I know everybody will jump on the bandwagon and say that the Caddy 4-6-8 was a terrible system, the engine sucked, etc., but look what is on the market today - 30 years later - from GM and Chrysler w/ the hemi - variable displacement engines that don't open the valves. Only difference is that the companies are uncoupling the lifters internally instead of the rockers. With some modification to the hydraulic/oil system, the same basic control could be used for valve actuation.
Honda (REALLY hard for me to use the H word as a reference) used the solenoid system in F1 years ago with good results. Pit tuning w/ a lap top was done after every hot lap session. FIFA made the system illegal do the rule change, but it did work. If they could get the valvetrain to live @ 14,000 - 16,000 rpm, the manufactures will make it work @ 6,000 rpm - eventually.