camless engine
Thread Starter
Administrator
Joined: Oct 2009
Posts: 42,385
From: Poteau, Ok
camless engine
I can see a catastrophic failure with a stuck/faulty valve. I can also see some advantages.
http://www.roadandtrack.com/new-cars...tion-in-china/
http://www.roadandtrack.com/new-cars...tion-in-china/
Old(s) Fart
Joined: Mar 2007
Posts: 50,539
From: Northern VA
Because that's such a common problem?
Cam-less engines have been "near" production for decades. The problem has always been that the actuators can't move fast enough at high RPMs. Keep in mind that at 5,000 RPM, each valve opens and closes 42 times a second. Of course, the ability to electronically change the "cam" profile on the fly has always been the holy grail.
Cam-less engines have been "near" production for decades. The problem has always been that the actuators can't move fast enough at high RPMs. Keep in mind that at 5,000 RPM, each valve opens and closes 42 times a second. Of course, the ability to electronically change the "cam" profile on the fly has always been the holy grail.
Connoisseur d'Junque
Joined: Sep 2010
Posts: 21,183
From: The Hudson Valley
Considering that the video said that it's cheaper, occupies less space, and weighs less, and considering that further improvement is inevitable, I'd say that it will be commonplace.
My only question is how progress in this area and progress in electric motors and energy storage will develop - if electrics get a lot better a lot faster, this technology may be left behind as a promising dead end.
- Eric
My only question is how progress in this area and progress in electric motors and energy storage will develop - if electrics get a lot better a lot faster, this technology may be left behind as a promising dead end.
- Eric
Old(s) Fart
Joined: Mar 2007
Posts: 50,539
From: Northern VA
Hookers under Hood
Joined: Nov 2013
Posts: 3,543
From: Ontario, Canada
The are making the new cars much lighter now as we know and the future is lighter .
What scares the heck out of me is, A little fiat POS was side by side with me on Hwy 10 a few days ago with high winds and blowing snow. Good thing I was in the left lane because suddenly a burst of wind actually blew my car over a bit but I hung onto it (G8 winter beater), but the little fiat went out of the tire tracks, hit the loose snow and off he/she went into the ditch. I see many of these little cars that can't handle mother natures wind speeds at times.
I'm gettin worried.
What scares the heck out of me is, A little fiat POS was side by side with me on Hwy 10 a few days ago with high winds and blowing snow. Good thing I was in the left lane because suddenly a burst of wind actually blew my car over a bit but I hung onto it (G8 winter beater), but the little fiat went out of the tire tracks, hit the loose snow and off he/she went into the ditch. I see many of these little cars that can't handle mother natures wind speeds at times.
I'm gettin worried.
Last edited by 76olds; Dec 24, 2016 at 08:31 AM.
Old(s) Fart
Joined: Mar 2007
Posts: 50,539
From: Northern VA
These tiny little pieces of crap were built to be used on the small narrow streets of Italy and other European countries. Then they import them over here and you saw what happens. If they only drove them in large cities they would probably be okay. I think they are death traps.
Hookers under Hood
Joined: Nov 2013
Posts: 3,543
From: Ontario, Canada
Registered User
Joined: Feb 2011
Posts: 1,591
From: Denmark
Torque should theoretically be constant for any given engine across the RPM range. The reason it isn't is the cam profile being optimal only for a certain RPM range. If cams were deleted, and valves could be controlled directly, this would all change.
Theoretically both direct injection and camless valves can be retrofitted to old American iron. But I'm more interested in it being applied to new cars ASAP, to make cars less dirty. I like my air clean.
Theoretically both direct injection and camless valves can be retrofitted to old American iron. But I'm more interested in it being applied to new cars ASAP, to make cars less dirty. I like my air clean.
Last edited by Seff; Dec 25, 2016 at 01:22 PM. Reason: Elaboration.
Registered User
Joined: Sep 2010
Posts: 1,659
From: Norfolk, Va
The are making the new cars much lighter now as we know and the future is lighter .
What scares the heck out of me is, A little fiat POS was side by side with me on Hwy 10 a few days ago with high winds and blowing snow. Good thing I was in the left lane because suddenly a burst of wind actually blew my car over a bit but I hung onto it (G8 winter beater), but the little fiat went out of the tire tracks, hit the loose snow and off he/she went into the ditch. I see many of these little cars that can't handle mother natures wind speeds at times.
I'm gettin worried.
What scares the heck out of me is, A little fiat POS was side by side with me on Hwy 10 a few days ago with high winds and blowing snow. Good thing I was in the left lane because suddenly a burst of wind actually blew my car over a bit but I hung onto it (G8 winter beater), but the little fiat went out of the tire tracks, hit the loose snow and off he/she went into the ditch. I see many of these little cars that can't handle mother natures wind speeds at times.
I'm gettin worried.
Hoist.gifHoist.gifHoist.gif
Registered User
Joined: Nov 2015
Posts: 685
From: So. Ca.
a pneumatic valve train has been in use since the 1980's, designed by Renault. Formula 1 uses it and is good at 20,000 rpms. I imagine a combination of electric/pneumatic valve train with computer controlled timing would give a substancial increase over camshaft actuated valves. good post
Hookers under Hood
Joined: Nov 2013
Posts: 3,543
From: Ontario, Canada
[QUOTE=cjsdad;977981]To continue and feed fuel to the hijack, I have (my wife has) a 2012 Mini Cooper Countryman ALL-4.
Hey, listen mister! Don't go wasting the fuel haha. I'll give you that one, Mini Coopers are OK, My sister owns one as well and she loves it.
Cheers
Eric
Hey, listen mister! Don't go wasting the fuel haha. I'll give you that one, Mini Coopers are OK, My sister owns one as well and she loves it.
Cheers
Eric
4 Barrels of Laughs
Joined: Jun 2016
Posts: 405
From: I moved to pittsburgh so I can be near Primantis
gm has messed with this for years and while it will work for a while, it will not work with a proper MTBF for a warranty that wont make people head to toyota....they have even played with different IC technologies essentially abandoning the otto cycle (read: rotary and miller cycle, both of which mazda pumped a few hundred mil into....)
the hydraulic method was too complex and to quick to physically break, the electronic method suffered from a lot of problems from coil saturation with solenoids to extreme heat fatigue for electronic components.
while it would be interesting, I dont think outside the lab its feasible. especially with longevity concerns
the hydraulic method was too complex and to quick to physically break, the electronic method suffered from a lot of problems from coil saturation with solenoids to extreme heat fatigue for electronic components.
while it would be interesting, I dont think outside the lab its feasible. especially with longevity concerns
4 Barrels of Laughs
Joined: Jun 2016
Posts: 405
From: I moved to pittsburgh so I can be near Primantis
Torque should theoretically be constant for any given engine across the RPM range. The reason it isn't is the cam profile being optimal only for a certain RPM range. If cams were deleted, and valves could be controlled directly, this would all change.
Theoretically both direct injection and camless valves can be retrofitted to old American iron. But I'm more interested in it being applied to new cars ASAP, to make cars less dirty. I like my air clean.
Theoretically both direct injection and camless valves can be retrofitted to old American iron. But I'm more interested in it being applied to new cars ASAP, to make cars less dirty. I like my air clean.
Registered User
Joined: Dec 2010
Posts: 857
From: crawfordville, florida
Navistar had a mid size camless engine for class 5 trucks and school bus application. When I first saw it in a school bus they had already had 200.000 miles on it driving around the county. It had a design C Life Cycle. It was a pretty neat engine with a shorter deck height due to no cam, push rods, etc. This low deck allowed for a radically tapered hood for better aero. I was told by Navistar engineers and the sales people it was not cheap to build. This was in the very late 90 s.
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