@Sebastijanovski Yeah we know that but for pushrod engines (single cam in block) this is the greatest camshaft breakthrough ever. We can now enjoy the benefits of DOHC tractability without needing them and enjoy lower inertia too.
Check out Ford's new system on its Coyote and EcoBoost engines- variable for timing, duration and lift- allowing the same engine to be tuned for max emission, max torque, or max hp at ANY given RPM. The direct injection 3.5 V6 makes 430ft/lb torque in the trucks @ a mildly tuned 365 hp. Check it out!
The Mahle CamInCam system does not vary the valve opening duration. This means that it has a very limited effect on the engine's performance. Basically it is only used in the Viper to help the engine pass emmission standards. The helical camshaft appears to be the only existing mechanical continuously variable duration system.
@MrEricJameson It seems to have a constantly variable degree of valve overlap. Looks like they're trying to improve volumetric efficiency throughout the operating rev range of the engine. It'd be good for both performance and emissions.
i think your design can also be employ on a DOHC engine, no only to change the timing, but also the DURATION, CONTINUOUSLY.
each valve/rocker arm to be service by 2 "half cam lobe"
eg, on the intake, fix the "half cam" for the valve closing, while the "half cam lobe" for the valve opening be attach to the inner shaft and adjusted accordingly (advance) to RPM. do the opposite on the exhaust cam.
it will be better than VTEC (non continuous) but less complicated than HELICAL SHAFT.
My best guess on the mechanism would be between cam chain tensioners along with some centrifugal gismos, or, a cam chain tensioner on one part, and oil pressure to the other. Those are more able to rev high at least.
I guess its actuated the same way as the eccentric weights on a Wacker vibratory plate compactor: You can let it "jump" forward or reverse by rotating the eccenter weights on the shaft by means of hydraulic pressure, fed through the shaft center. Lobes are more or less comparable to the eccenterweights of the vibratory compactor. I once had one stuck a couple of days after a repair, because i used too much instant gasket when reassembling after repair !
i mean they have some sort of thing that bolts to the end of the cam on the opposite side of the cam gears but hoe does it change it and when do they usually kick in ?
Ahem DOHC,... Plus, the last paragraph in the description is pure bullshit.
Sebastijanovski 4 months ago
@Sebastijanovski Yeah we know that but for pushrod engines (single cam in block) this is the greatest camshaft breakthrough ever. We can now enjoy the benefits of DOHC tractability without needing them and enjoy lower inertia too.
zapwatt 1 month ago
While this is a very impressive and interesting piece of engineering goodness, I disliked this video to be a douche.
gyro231995 5 months ago
Totally awesome. But it's only valve timing and no variable duration and so on. V-tech is still the best.
kimgulle 9 months ago
@kimgulle V-Tech makes phones.
brw147 9 months ago in playlist Hauptgruppe 1 Motor
@brw147 Best phones.. xD
kimgulle 9 months ago
awesome
KingsOfCompression 1 year ago
Check out Ford's new system on its Coyote and EcoBoost engines- variable for timing, duration and lift- allowing the same engine to be tuned for max emission, max torque, or max hp at ANY given RPM. The direct injection 3.5 V6 makes 430ft/lb torque in the trucks @ a mildly tuned 365 hp. Check it out!
88jamesy88 1 year ago
i'm a cam grinder in san diego... what cam is that??? ty
diablotijuanero1 1 year ago
The Mahle CamInCam system does not vary the valve opening duration. This means that it has a very limited effect on the engine's performance. Basically it is only used in the Viper to help the engine pass emmission standards. The helical camshaft appears to be the only existing mechanical continuously variable duration system.
MrEricJameson 1 year ago
@MrEricJameson It seems to have a constantly variable degree of valve overlap. Looks like they're trying to improve volumetric efficiency throughout the operating rev range of the engine. It'd be good for both performance and emissions.
oOoxelAoOo 7 months ago
Comment removed
ShannaniganP 1 year ago
Comment removed
ShannaniganP 1 year ago
hi mahlezu,
i think your design can also be employ on a DOHC engine, no only to change the timing, but also the DURATION, CONTINUOUSLY.
each valve/rocker arm to be service by 2 "half cam lobe"
eg, on the intake, fix the "half cam" for the valve closing, while the "half cam lobe" for the valve opening be attach to the inner shaft and adjusted accordingly (advance) to RPM. do the opposite on the exhaust cam.
it will be better than VTEC (non continuous) but less complicated than HELICAL SHAFT.
maximillianof98 1 year ago
... the HELICAL camshaft is the only design that can varies the DURATION, continuously. (search wikipedia, "Helical camshaft")
your design have the potential to do the same, but less complicated and easier to manufactured.
maximillianof98 1 year ago
@ariffkm: This is a camshaft for a pushrod engine. not SOHC, but basically does the same thing as a DOHC
@yan: the video shows the camshaft that went into the SRT-10 Viper, but I think Chrysler also uses it in their new Hemi 5.7 V8.
and @ the rest of the world: anyone know the answer to jfv's question? I'm also curious what mechanism controls the phase offset for the inner shaft.
spthirtythree 2 years ago
@spthirtythree
My best guess on the mechanism would be between cam chain tensioners along with some centrifugal gismos, or, a cam chain tensioner on one part, and oil pressure to the other. Those are more able to rev high at least.
mikeb1444 1 year ago
we are in presence of a great video director. talented man. he knows very well what he wants to show and all it's very comprehensive.
xicoze54 3 years ago
brilliant, yet simple design.
Question remains: how is the valvetiming managed/actuated/changed? Oilpressure? Electric motor? Vacuum?
jfv65 3 years ago
some use oil pressure (hydraulic controlled).
Some use a 'stepper' motor to change the position.
marek0086 2 years ago
I guess its actuated the same way as the eccentric weights on a Wacker vibratory plate compactor: You can let it "jump" forward or reverse by rotating the eccenter weights on the shaft by means of hydraulic pressure, fed through the shaft center. Lobes are more or less comparable to the eccenterweights of the vibratory compactor. I once had one stuck a couple of days after a repair, because i used too much instant gasket when reassembling after repair !
RenzeZielman 2 years ago
how many valves to a cylinder does tthis have?
yanzodadon 3 years ago
is this "single over head cam"(SOHC)??
ariffkm 3 years ago
Nice animation
Binaer123 3 years ago
i believe that they mean that you can change the duration by removing the drift keys and actually shifting the lobe locations
enginemasterbuilder 3 years ago
how do the vairable lobes.... vary.. lol..
i mean they have some sort of thing that bolts to the end of the cam on the opposite side of the cam gears but hoe does it change it and when do they usually kick in ?
nighawaaaxx 3 years ago