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#101 BRG

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Posted 25 July 2015 - 15:38

Tracks all around the world is pretty much getting shut down by noise restrictions. It is really silly.

http://jalopnik.com/...upid-1718765458

What a deeply stupid and ill-informed article that is, written by a typical know-nothing pillock. The sort of pillock who will contribute a great deal to the demise of racing and any track based activity by his ignorant and selfish attitude.  If Koenigsegg couldn't get a 'production' car under a 103db limit, then they are incompetent. Or more likely, not bothering to try.  I would rather than Spa survived as a race track and Koenigsegg stayed at home in Sweden where they can't do any more damage to relationships with local people.



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#102 Canuck

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Posted 25 July 2015 - 16:08

Having not read the article you linked, but Koenigsegg's own, you'll find there's no argument from the Swedish crew with the noise limits.  They simply noted that most road-legal production high-power sports cars will all easily pass the noise tests required, because the noise tests don't require you to pass while driving the car in full anger mode (or full joy mode as the case may be) and oft employ various switchable baffles and restrictors to meet the requirements of low noise within the testing parameters, but full power when required.  They felt they could have addressed the volume issue with more time, but that they were unprepared - entirely their own doing and nothing negative about the track's use of the limit. No need to pit Koenigsegg against the citizens around Spa - that was never an issue.



#103 gruntguru

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Posted 04 May 2016 - 04:39

 

Any news on K's pneumatic valve system? It never sounded very likely to me.           

Looks like Mr K. has hooked up with Chinese Company Qoros to progress his camless technology. http://www.gizmag.co...s-engine/43045/

 

A year or two to design and build a complete engine. Not bad. Compact top end as expected.



#104 Greg Locock

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Posted 04 May 2016 - 08:30

As Cannuck says, passing the euro noise regs, or the various racing series noise regs, is bread and butter for a production car's development engineers. Racing teams find it difficult because it is not their core expertise. 



#105 Kelpiecross

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Posted 05 May 2016 - 05:25

Looks like Mr K. has hooked up with Chinese Company Qoros to progress his camless technology. http://www.gizmag.co...s-engine/43045/
 
A year or two to design and build a complete engine. Not bad. Compact top end as expected.


I was so excited by this announcement that I nearly **** my pants.

#106 Canuck

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Posted 05 December 2016 - 06:01

http://www.enginelab...lve-technology/

The latest on their camless technology from the Drive.

#107 imaginesix

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Posted 05 December 2016 - 10:45

Looks like Mr K. has hooked up with Chinese Company Qoros to progress his camless technology. http://www.gizmag.co...s-engine/43045/
 
A year or two to design and build a complete engine. Not bad. Compact top end as expected.

When do I get my royalty cheque?

http://forums.autosp...gy/#entry444330

#108 blkirk

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Posted 23 May 2018 - 21:07

Dr. Amir Khajepour at University of Waterloo thinks he has a way to do fully controlled valves using hydraulics.  The articles are a little light on detail, and the animation on the uwaterloo site is hard to follow.  It looks like they have an interesting solution, though.  I wonder how well those valve cylinders still seal after 5 years of operation.  Traditional valves can already have leaks around the valve stems and they don't have pressurized oil behind them.

 

http://www.asme.org/...mbustion-part-1

http://www.asme.org/...mbustion-part-2

https://uwaterloo.ca...-hybrid-engines



#109 gruntguru

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Posted 23 May 2018 - 21:51

I don't see sealing as an issue. The valve stem seals could be isolated from the hydraulic actuators. Absence of side loads means longer guide and seal life. The seals within the actuators themselves would not need to be totally leak free. They would operate with engine oil and any loss from the actuator would remain within the engine.



#110 gruntguru

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Posted 05 February 2019 - 22:39

"Dynamic Fuel Management" from GM uses cylinder skipping in any of 17 possible sequences to run their latest 6.2L V8 on as few as two cylinders. This is an electro-mechanical system that "latches/un-latches" hydraulic lifters to deactivate the valves on specific cylinders.  http://blog.consumer...uel-management/

 

Because there are mechanical "latching" components involved, the system doesn't seem to activate a particular cylinder on a cycle by cycle basis (eg fire 2, skip 1) so still falls short of the cylinder deactivation capabilities of a system like "Freevalve".


Edited by gruntguru, 05 February 2019 - 22:39.