Pretty cool. I think it would be cool if someone developed a system to use exhaust gas to actuate valves, much like exhaust gases are used to operate some semi-automatic rifles (like the AR-15 or AK-47).
How about this. New camless engine.
4
http://jalopnik.com/5884144/swedish-supercar-to-debut-radical-engine-of-the-future
Swedish Supercar To Debut Radical Engine Of The Future
Swedish supercar manufacturer Koenigsegg told Car & Driver that they are engineering their twin-turbo V8 engine to run without a camshaft. The far-flung world of infinitely variable engines will soon be upon us.
While regular engines use a camshaft and a valve spring, Koenigsegg's camless engine will shoot the valve open with pneumatically driven actuators. It's expensive, it's loud and it's crude, but it's infinitely variable as well as significantly lighter than a camshaft. In the end, you have an engine that is 30% more efficient than what is in road cars (and nearly all race cars) today.
Working with Sweden's Cargine Engineering, Koenigsegg is on the cutting edge of engine tech, so it's no surprise they admit they're working through noise and reliability issues. The thrill remains that for decades this technology has existed only in the secretive world of Formula One. Now it's finally coming to the world of road cars, even if it is just for monstrously expensive Swedish hypercars.
A detailed explanation of pneumatic valves and camless engines can be found here at ScarbsF1.com.
Photo Credit: Eddy Clio
F1 Engines _ Valve technology
All F1 engines have used pneumatic valves for some time, first introduced by Renault on the late versions of the their V6 turbo engine.
Wire spring valve
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Previously wire valve springs have been used, they use a coil spring (13) to return the valve (1) to a closed position after the cam has retarded. They required huge amounts of the detail development on their shape and material to reach the rev limits of around 15k RPM. The pressure to deliver power from 3.5l and later 3.0l engines required ever higher rev ceilings and metal springs could not longer be developed at the same rate as the rest of the engine.
Pneumatic valve spring
![]()
Pneumatic systems use conventional cams operating the valve (4) via a shim\bucket or finger follower, the valve spring pocket is replaced with a chamber (28) pressurised with nitrogen (held within a cylinder in the sidepods) that runs at a constant pressure to return the valve when the cam timing retards. You often see the teams suffer a loss of pressure in the races through leaks in the system, the driver comes in and mechanics re-pressurises the pneumatic circuit, this rarely works for more than few laps. Also when Engines are changed the un-installed engine needs a remote gas cylinder connected in order for the valves not to drop and hit the pistons.
Wire spring vs Pneumatic valve comparision
![]()
Renault Electro-Hydraulic (Camless) valve actuation
![]()
Renault have not planned an Electro-mechanical system, which was commonly believed to use actively controlled magnetic coils to open and close the valves. Clearly the electrical and RPM performance required from the this system were not ready or suitable for a F1 engine.
What Renault have is an Electro-hydraulic system, where two pressurised circuits operate the valve (16). Valve return is still handled by the pneumatic system (52, 20), but the opening of the valves discards cams for a hydraulic circuit (50) controlled by a electronic valve (58). As this system can use high pressure hydraulics already on the car to operate the valve at the required RPM ceiling, the system seems almost too simple..! Infinitely variable valve timing plus the loss of the reciprocating weight of the cams and drive gears makes this an enticing solution. This solution has yet to race or to my knowledge even be tested in a car, Renault have admitted that as a broader automotive organisation, that this systems has been tried.
Swedish Supercar To Debut Radical Engine Of The Future
Swedish supercar manufacturer Koenigsegg told Car & Driver that they are engineering their twin-turbo V8 engine to run without a camshaft. The far-flung world of infinitely variable engines will soon be upon us.
While regular engines use a camshaft and a valve spring, Koenigsegg's camless engine will shoot the valve open with pneumatically driven actuators. It's expensive, it's loud and it's crude, but it's infinitely variable as well as significantly lighter than a camshaft. In the end, you have an engine that is 30% more efficient than what is in road cars (and nearly all race cars) today.
Working with Sweden's Cargine Engineering, Koenigsegg is on the cutting edge of engine tech, so it's no surprise they admit they're working through noise and reliability issues. The thrill remains that for decades this technology has existed only in the secretive world of Formula One. Now it's finally coming to the world of road cars, even if it is just for monstrously expensive Swedish hypercars.
A detailed explanation of pneumatic valves and camless engines can be found here at ScarbsF1.com.
Photo Credit: Eddy Clio
F1 Engines _ Valve technology
All F1 engines have used pneumatic valves for some time, first introduced by Renault on the late versions of the their V6 turbo engine.
Wire spring valve
Previously wire valve springs have been used, they use a coil spring (13) to return the valve (1) to a closed position after the cam has retarded. They required huge amounts of the detail development on their shape and material to reach the rev limits of around 15k RPM. The pressure to deliver power from 3.5l and later 3.0l engines required ever higher rev ceilings and metal springs could not longer be developed at the same rate as the rest of the engine.
Pneumatic valve spring
Pneumatic systems use conventional cams operating the valve (4) via a shim\bucket or finger follower, the valve spring pocket is replaced with a chamber (28) pressurised with nitrogen (held within a cylinder in the sidepods) that runs at a constant pressure to return the valve when the cam timing retards. You often see the teams suffer a loss of pressure in the races through leaks in the system, the driver comes in and mechanics re-pressurises the pneumatic circuit, this rarely works for more than few laps. Also when Engines are changed the un-installed engine needs a remote gas cylinder connected in order for the valves not to drop and hit the pistons.
Wire spring vs Pneumatic valve comparision
Renault Electro-Hydraulic (Camless) valve actuation
Renault have not planned an Electro-mechanical system, which was commonly believed to use actively controlled magnetic coils to open and close the valves. Clearly the electrical and RPM performance required from the this system were not ready or suitable for a F1 engine.
What Renault have is an Electro-hydraulic system, where two pressurised circuits operate the valve (16). Valve return is still handled by the pneumatic system (52, 20), but the opening of the valves discards cams for a hydraulic circuit (50) controlled by a electronic valve (58). As this system can use high pressure hydraulics already on the car to operate the valve at the required RPM ceiling, the system seems almost too simple..! Infinitely variable valve timing plus the loss of the reciprocating weight of the cams and drive gears makes this an enticing solution. This solution has yet to race or to my knowledge even be tested in a car, Renault have admitted that as a broader automotive organisation, that this systems has been tried.
1 - 20 of 21 Posts
You guys have no idea...
They use camless pneumatic valves to play music :whipping:
Check this out:
![]()
They use camless pneumatic valves to play music :whipping:
Check this out:
You guys have no idea...
They use camless pneumatic valves to play music :whipping:
Check this out:
Viva Alonso by the way
They use camless pneumatic valves to play music :whipping:
Check this out:
Viva Alonso by the way
damn you Wankel! well played sir
1 - 20 of 21 Posts
