using vtec to dissable a cylinder idea.

[greenek]

I don't know if some one has thought of this already. But I almost think its possible.

So vtec is currently used to engage a cam lobe with a higher lift, and more duration.

What if, a custom cam shaft was ground, so that your vtec lobes, were just the regual lift and duration or, what ever would be beneficial for FE.
And in place of the original commuting lobes, remove the intake lobe from 2 cylinders.. But leave the exact same lobe or even something more beneficial on the other two cylinders. For highway cruising.
So you would wire vtec to a switch, and run in vtec through the city. And when you pull onto the highway, and get up to speed, flick vtec off to disable the 2 cylinders, and flick off a switch for the injectors.

Comments please. Flaws, pros, better ideas.
I think it might be a solid idea.

[cleanspeed1]

I'd say go for it. It's like running vtec in reverse and adding injector disable.

Go a step further and implement a way to keep the valves closed in 2 cylinder mode.

[greenek]

Well will the disabled cylinders, the intake lobe for would be ground to nothing so there is no lift but there would still be exhaust lift, because vtec does not affect exhaust in a single. Cam.
So. Its like this summed up.

In vtec...
Manual Switch controlled. ON
All cylinders work like normal.

Out of vtec...
Manual switch controlled. OFF
Intake valves stay shut on 2 cylinders.
Fuel is disabled to 2 cylinders.
Exhaust valves operate like normal. On all 4 cylinders.

[BackroadBomber]

You may be on to something...

[drmiller100]

yup. that would work.

[cbaber]

The problem with this is that you will get way better MPG with 4 cylinders working normally. Actually, you are even better off running a non-Vtec engine (what you have unless you swapped it) unless its the lean-burns with VTEC-E. 2 cylinders on the highway is not enough power to maintain a decent speed. You would be mashing the throttle to the floor and that defeats the purpose of disabling the cylinders in the first place.

[Frank Lee]

Exhaust valves not closing = no, you are not on to something.

[greenek]

This was just a idea, no idea if it would work. Or not

Exhaust valves would open and close like normal. Since they are not affected by vtec on a single cam.

[Ryland]

Sounds like what you want is the Vtec-e, a single intake and a single exhaust valve open at low RPMs, at high RPMs (2,500 and up) a 2nd intake valve opens the same amount as the regular intake valve, there is a JDM D15A if I remember correctly, that had a single intake valve open up to 2,500rpm then the 2nd intake valve opened and above 5,000rpm they both opened up a bit more for even more power.

[drmiller100]

exhaust timing is interesting in that it never creates pressure inside the engine.

it is an interesting enough idea i am considering trying it on one of my Hondas.....