Camless Engine is Coming

Anything goes (within forum guidelines of course)
User avatar
RRoller123
Patron 2020
Patron 2020
Posts: 8179
Joined: Sun Nov 13, 2011 2:04 pm
Your car is a: 1980 FI SPIDER 2000
Location: SAGAMORE BEACH, MA USA

Camless Engine is Coming

Postby RRoller123 » Wed Nov 23, 2016 8:13 am

https://www.youtube.com/watch?time_cont ... ZWeNPi2XkE

So the QA gremlin within me wonders what happens when there is a failure. Of course a system like this will experience failures, likely at a far higher rate than a purely Cam\Wheel\Belt-Chain based mechanical system. The spring likely would just return the valve to its closed position and hold it there. :?: No valve contact to piston. :?:

Pete
'80 FI Spider 2000
'74 and '79 X1/9 (past)
'75 BMW R75/6
2011 Chevy Malibu (daily driver)
2010 Chevy Silverado 2500HD Ext Cab 4WD/STD BED
2002 Edgewater 175CC 80HP 4-Stroke Yamaha
2003 Jaguar XK8
2003 Jaguar XKR
2021 Jayco 22RB
2019 Bianchi Torino Bicycle

dreavis
Posts: 111
Joined: Wed Apr 08, 2015 2:32 am
Your car is a: 1977 Fiat 1800

Re: Camless Engine is Coming

Postby dreavis » Wed Nov 23, 2016 1:02 pm

When I looked at the youtube video it was followed by a 9 minute video featuring Christian Von Koenigsegg who described the engineering behind the freevalve system. He also describes the results of their tests with a 1.6l 4-cylinder engine. Huge power and torque boosts with lower emissions and fuel consumption. Pretty incredible.

User avatar
azruss
Posts: 3659
Joined: Sun May 30, 2010 12:24 pm
Your car is a: 80 Fiat 2000 FI

Re: Camless Engine is Coming

Postby azruss » Tue Nov 29, 2016 12:05 am

I can't believe it has taken this long to develop solenoid actuated valves. It always seemed to me the easiest way to have variable valve timing. I suspect the issue is developing a durable enough solenoid.

User avatar
RRoller123
Patron 2020
Patron 2020
Posts: 8179
Joined: Sun Nov 13, 2011 2:04 pm
Your car is a: 1980 FI SPIDER 2000
Location: SAGAMORE BEACH, MA USA

Re: Camless Engine is Coming

Postby RRoller123 » Tue Nov 29, 2016 5:23 am

Yeah, I think it is a classic QA problem, and the consequence of failure is catastrophe.
'80 FI Spider 2000
'74 and '79 X1/9 (past)
'75 BMW R75/6
2011 Chevy Malibu (daily driver)
2010 Chevy Silverado 2500HD Ext Cab 4WD/STD BED
2002 Edgewater 175CC 80HP 4-Stroke Yamaha
2003 Jaguar XK8
2003 Jaguar XKR
2021 Jayco 22RB
2019 Bianchi Torino Bicycle

JohnGalt
Posts: 15
Joined: Sat Nov 26, 2016 7:06 pm
Your car is a: 1979 Spider 124

Re: Camless Engine is Coming

Postby JohnGalt » Wed Nov 30, 2016 4:19 pm

Like Drevis said, the following video is well worth watching. They are claiming a 45% torque and hp increase while saving weight.

garion
Posts: 508
Joined: Tue Sep 18, 2012 10:20 pm
Your car is a: 1979 Fiat 124 Spider
Location: Phoenix, AZ

Re: Camless Engine is Coming

Postby garion » Wed Nov 30, 2016 8:55 pm

I dont think it was the durability that was holding back the actuated valve, but rather the speed that they need to react to. The hydraulics were too slow or something.
--John
1978 Fiat 124 Spider (for sale soon)
1979 Fiat 124 Spider
2007 Audi A4
Blog: http://www.technobabelfish.com

User avatar
mpollock
Posts: 88
Joined: Mon May 09, 2011 10:06 pm
Your car is a: 1979 spider 2000
Location: North side of Indianapolis

Re: Camless Engine is Coming

Postby mpollock » Wed Nov 30, 2016 11:02 pm

I wouldn't be more worried about a failure with this valve than a conventional cam-driven valve. It looks like it has a spring return just like the cam-driven valve so if the driving mechanism fails it would just passively return to the closed position. The valve could bind in the valve guide and stick open, but so could a cam-driven valve. The added area of failure with the camless valve is a software timing issue where the controller commands the valve to open at an instant where it could collide with the piston - but this could be overcome with electrical interlocks that would open the circuit to the coil when the piston is in the danger zone. You would want to use something more durable than a mechanical switch - maybe something like hall-effect sensors or some other non-contact device, but it could be done with pretty good reliability and durability. Nothing's perfect so there's some chance that you could experience a catastrophic failure in an engine where the valve and piston could possibly occupy the same space, but you can get that on a cam-driven valvetrain too.

Nitrate
Posts: 278
Joined: Thu Jul 23, 2015 5:38 pm
Your car is a: 1981 Fiat 2000

Re: Camless Engine is Coming

Postby Nitrate » Mon Dec 19, 2016 7:40 pm

I think F-1 race cars have had a set up like this for a pretty long time. RB

User avatar
SP3
Posts: 108
Joined: Wed Nov 18, 2015 4:56 pm
Your car is a: 1966 Ducati 250 Monza
Location: Canton, Ohio, USA

Re: Camless Engine is Coming

Postby SP3 » Sat Apr 01, 2017 12:51 pm

Nitrate wrote:I think F-1 race cars have had a set up like this for a pretty long time. RB



No, they haven't. They universally use pneumatic springs for the closing and universally use camshafts for opening. Renault did experiment with a vaguely similar idea back in the late days of the V10s but it never made it on track that I know of.


Return to “Off Topic & Social”

Who is online

Users browsing this forum: No registered users and 18 guests