[driverace]

@aargie
desmo valve system, operates with solenoids: as in electronic signal actuates the valves. this eliminates heavy cams-components,(considerable weights! in lightweight engines..)
plus, gives flexibility to have variable timing

Originally Posted by driverace

@aargie
desmo valve system, operates with solenoids: as in electronic signal actuates the valves. this eliminates heavy cams-components,(considerable weights! in lightweight engines..)
plus, gives flexibility to have variable timing

and lift, at any/all rpms, of all individual valve sets, independant of others!

I think, that is the dividing line.

@one-out-of-multiple cylinders firing at idle, umm, I remember reading this, that in V12, in some eco mode, only 4pots fire, while the others dont!
(sorry, I do not recall the source, though)

My thinking on the matter is, that if we keep the inlet nad exhaust valves of non-powering cylinders open in the case suggested by you, we can have the least possible resistance from the non-powering cylinders.

If we are missing/overlooking some things here, experts, please shed some light!

Care.

Ace.

[PhiGolden]

Originally Posted by driverace

@aargie
desmo valve system, operates with solenoids: as in electronic signal actuates the valves. this eliminates heavy cams-components,(considerable weights! in lightweight engines..)
plus, gives flexibility to have variable timing

I do not think Desmo operates with solenoids. It uses an extra rocker arm to push the valve close rather than a spring. It seems the springs can lag at high speeds and the valve can remain partially open even when the piston is at TDC.

[aargee]

Originally Posted by PhiGolden

I do not think Desmo operates with solenoids. It uses an extra rocker arm to push the valve close rather than a spring.

Strongly agree with you Golden;
@driverace - Here's my source to show you buddy - Desmo Valve Animation
PS - My handle is aargee & not aargie

[Shan2nu]

Wow, desmo valve system is neat. No need to worry about spring rating, valve float etc. The bottom arm will make sure the valve returns back on time.

But are those rocker arms adjustable to cams with higher lift or vvt cams?

Shan2nu

[driverace]

Originally Posted by PhiGolden

I do not think Desmo operates with solenoids. It uses an extra rocker arm to push the valve close rather than a spring. It seems the springs can lag at high speeds and the valve can remain partially open even when the piston is at TDC.

Yes, I actually read about those more later.
I was confusing them with this

source:
::: Automotive Control Lab :::
replacing the Hydraulic system with electrically actuated one (electro-magnetic in nature)

Originally Posted by aargee

Strongly agree with you Golden;
@driverace - Here's my source to show you buddy - Desmo Valve Animation

thank you for the animation!
My Bad.

PS - My handle is aargee & not aargie

Sorry aargee ~ !
Do Have a look at what I was talking about. (wrongly referring it to as desmo valves)
Camless Engines Promise Greater Efficency - Fuel Economy - Jalopnik

Doing the 6S engine on desmos seems tough too!

Originally Posted by Shan2nu

Wow, desmo valve system is neat. No need to worry about spring rating, valve float etc. The bottom arm will make sure the valve returns back on time.

But are those rocker arms adjustable to cams with higher lift or vvt cams?

Shan2nu

We wll not need to worry about any cam profile/ or no need to change the cam profile for low/high speed gains !
the solenoids can be adjusted with simple programs to do so.

perhaps we can assign some non-linear relation with rpms for the lift & duration of the lift.

Sorry for the goof-up.

Care.

Ace.