Jackwf

Hi, good afternoon

Anyone can explain to me what is the reason and purpose of exhaust cam design for engine M111.957 model in W210.
my car got 4 valves per cyl (2 intake ; 2 exhaust).
But why "" Different of Exhaust cam lobe height "" ?

by,
Jack

ohlord

of the 4 valve engines had variable cam adjustment.The 3 valve m112 and m113 achieve the same thing by varying the intake distance by use of flaps in the intake track.
ohlord

Jackwf

thanks for your explaination

yup. i understood what u mean.. but what i dont understand is the
"" different camshaft lobe design of EXHAUST CAM" - two lobes with different angle and cam lobe height as well .. why ??

ohlord

with the cam advance mechanics it rotates and decreases valve lift at low rpm to increase torque and increases lift on that valve at higher rpm for more power top end.
ohlord

Jackwf

no no no.. my exhaust cam dont have cam advance mechanism, it's ordinary exhaust cam just the cam lobe is slightly vary in design per cylinder, "one is bigger and one is smaller" ; the two lobes is totally different spec.
thru my examine, it's cam profile is different in opening but same in closing, may i know what reason behind to make it like that ?