"variable cylinder shutoff"??

[Mr. Wyndham]

[CamaroSpike23]

Originally Posted by Dragoneye

there are moving parts...I mean, there's a little cyllinder in between the cams and pushrods - from what I understand, and fluid compresses something inside the cyllinders to "connect" the pushrods to the cam...and releases when AFM activates...

The rest: fuel, spark, and valve deactivation signal - are all computer controlled.

sort of. the pushrods are in contact with the cam all the time, the lobes of the cam move the pushrods, which move the lifters/rockers on a fulcrum which in turn opens the valves.

all this will stay in motion when the cylinders "shut down", its just the injectors (and possibly spark plugs) for those cylinders will not activate.

[Mr. Wyndham]

....eeeh, not quite. I know for sure that the valves deactivate, too. That's why they have trouble putting it in some engines, not enough space in the valley for all the crap to make it work. And I distinctly remember arguments about the backpressure created, because the valves were closed - people count figure out what the point of it was.

But you did get me on one point...the little cyllinders are not on the camshaft, the pushrods are always touching it, the "De-ac" lifter is in between the lifters and the pushrods, my bad.

Interesting read on the LS4 (you'll have to scroll down a bit):
LS4

The keys to AFM’s efficiency are advanced capabilities built into the ECM and a set of special two-stage hydraulic valve lifters. These De-ac lifters are installed for cylinders that shut down in V4 mode. They have inner and outer bodies which normally operate as a single unit. When the engine controller determines cylinder deactivation conditions are optimal, it activates solenoids in the engine lifter valley, which in turn direct high-pressure oil to the switching lifters. This oil pressure activates a release pin inside the lifter, allowing the outer body on the De-ac lifter to collapse around the inner body. The shortened lifters move with the camshaft, but do not move the pushrod or operate the valves on their cylinders. When the ECM wants V8 power, it stops the flow of oil to the De-ac lifters. The locking pin releases and all valves begin operating.

[TAG UR IT]

^Thanks for that snipped, Dragon. I was wondering...

[Mr. Wyndham]

what?!? Thou doubtest me?

[CamaroSpike23]

ok, i get what you were saying now. thanks for the insight on this.

next thing you know, we'll be getting vtech...lol

[Mr. Wyndham]

you mean VVT?....

[SoFlaZ]

vtech? ROFL LMAO



Just had to do it

But there is a difference between vtec and vvt. VVT works all the time and VTEC, lol, works after 6000rpm or something. I once found a good video on it but cant find it anymore. :(

[Mr. Wyndham]

now that's something that I didn't know...hmmm.
Well now that I think about it...vtec utilizes 2 completely different Camshaft profiles, whereas VVT uses the same profile, just adjusts timing constantly....

(VVT is better in my book. But nobody reads my book.)

[CamaroSpike23]

Originally Posted by Dragoneye

now that's something that I didn't know...hmmm.
Well now that I think about it...vtec utilizes 2 completely different Camshaft profiles, whereas VVT uses the same profile, just adjusts timing constantly....

(VVT is better in my book. But nobody reads my book.)

if you want, ill talk to Operah and see if she'll sponsor it. lol

[Mr. Wyndham]

ROFLMAO!!!!

I can't breathe!

[TAG UR IT]

Originally Posted by Dragoneye

what?!? Thou doubtest me?

Nope. Just wondering how things work.

[SoFlaZ]

Well many new hondas have i-vtec (I thought it was a new apple product at first lol) which has vvt and vtec