998 GT3?
06-13-2006, 12:17 PM
#31
King of Cool
Rennlist Member
Rennlist Member
Originally Posted by sweanders
It would be cool if Porsche took the honor of being the first manufacturer with pneumaticly controlled valves like in the F1 cars. 10.000 rpm anyone? 
Last edited by Flying Finn; 06-13-2006 at 03:47 PM.
06-13-2006, 01:32 PM
#32
Burning Brakes
An electro Valve implementation would be difficult at best. A high rpm application would run into problems with physics. You could not use the standard coil/core (selenoid) set up, it takes time, re:time constant RL, for the field to build and then you have a bunch of energy to deal with on deenergizing (think ignition coil).
There are materials that actually bend when a current is directly applied, I'm thinking something like this might be suited to an application like this.
There are materials that actually bend when a current is directly applied, I'm thinking something like this might be suited to an application like this.
06-13-2006, 10:54 PM
#33
Nordschleife Master
Originally Posted by RayGT3
An electro Valve implementation would be difficult at best. A high rpm application would run into problems with physics. You could not use the standard coil/core (selenoid) set up, it takes time, re:time constant RL, for the field to build and then you have a bunch of energy to deal with on deenergizing (think ignition coil).
There are materials that actually bend when a current is directly applied, I'm thinking something like this might be suited to an application like this.
There are materials that actually bend when a current is directly applied, I'm thinking something like this might be suited to an application like this.
Piezo electrics are an interesing approach as well. Not sure they could do, say 100 cps, in current form with that much energy however. Are you familiar with such a system?
06-14-2006, 08:59 AM
#34
Originally Posted by allegretto
Well, I respect your approach but I would disagree. I deal in devices that are elecromagnetically controlled that cycle, with relatively large excursions at 200 cps, that's roughly 24,000 RPM so I think that the materials and electronics are there, it's a matter of cost and reliability in that hostile an environment.
Piezo electrics are an interesing approach as well. Not sure they could do, say 100 cps, in current form with that much energy however. Are you familiar with such a system?
Piezo electrics are an interesing approach as well. Not sure they could do, say 100 cps, in current form with that much energy however. Are you familiar with such a system?
06-14-2006, 09:53 AM
#35
Burning Brakes
allegretto,
The real trick would be to get a car engine to run at 24 k rpm for any length of time. Getting around intake velocities in the sonic range is problematic. Any attempt to operate in those ranges also adds cavatation to deal with, this would distroy any currently available materials in a short time. It appears that F1 has reached a wall at about 20 k rpm. depending on displacement size. Valve mechanics really aren't an issue, it's the ability to get the fluid into the cylinder and not destroy the motor in the process.
The real trick would be to get a car engine to run at 24 k rpm for any length of time. Getting around intake velocities in the sonic range is problematic. Any attempt to operate in those ranges also adds cavatation to deal with, this would distroy any currently available materials in a short time. It appears that F1 has reached a wall at about 20 k rpm. depending on displacement size. Valve mechanics really aren't an issue, it's the ability to get the fluid into the cylinder and not destroy the motor in the process.
