Does anyone know if this is possible? is it just ECU programming or actuall different parts in the motor?

 

different parts in the motor, probably different cams as well

 

damn thanks for the info anyways

 

well in thoery it is possible but not sure what would need to be done probally in the long run youll just be building your 2.2 into the 2.4

 

Is VVT that good? What does it do exactly. I have a 2.4 and have no idea what the VVT actually does. I know its Variable Valve Timing. But what does it do to to actually help?

 

"The new variable valve timing system uses electronically controlled hydraulic camshaft phasers to alter the relationship of the intake and exhaust camshafts as much as 50 degrees relative to the crankshaft." This allows the PCM to maximize the power output throughout the RPM range giving the 2.4L a relatively flat torque curve.

 

And it is more expensive and something else to break.

 

Yup, the more gadgets on the motor... the more risk to break... But Honda and Toyota have been using them for years... so I wouldn't worry about it too much.... as long as GM didn't screw things up again!

 

Here's how it physically works. Your valves, which allow gas in and exhaust out, open and close in time with the turning of the engine. This is accomplished by means of a chain wrapped between the crankshaft and the camshafts. The camshaft is the part that actually opens the valves. The timing is normally a fixed thing, since it is a chain, when one gear turns (the crank), so does the other (the cam).

With Variable Valve Timing, its all the same, except they put a degree of "slack" in the chain which is then kept tight by tensioners. If you put tension on one side of the chain, the cams turn in one relative timing with the crank. If you shift the tension to the other side of the chain, the cams timing changes along with the shift.

The reason for doing this has to do with RPM. The efficiency of fluid movement (gas in, exhaust out), changes with changes in RPM. A fixed valve timing arrangement picks a setting that will give the best possible operation through all ranges of RPM. With VVT, the engine can actually change the valve operation timing to accomodate the current engine RPM and hence be more effecient and deliver more power.

You can not modify an engine to become VVT capable. It has to be part of the core engine design. Its like asking if you can modify our engines to be DVD players or something.

 

I think I'll just stick with a turbo in that case, thanks.

 

i thought the honda civics have been turning non v-tec to v-tec for years with a few parts, in fact i saw a write up on it a few years back in import tuner

 

as far as I know, u have to swap the head on a honda to get V-tak yO.

 

im just saying it can done easily on them so maybe for us too

 

with enough fabrication, anything is possible. it would be quite a challenge and an interesting project.
i thought the vvt maximized fuel economy, not power. didnt the 2.4l eco have the extra power from the increased displacement?
there is a guy on ecotecpower.com who is trying this, maybe do a search there.

 

vvt definately helps with power

 

how would it? the vvt is 20 hp approx more than the 2.2l. it has .2l more displacement with higher compression pistons as well. dont you think the extra hp comes from there? what about examples of other engines running the same compression and displacement without vvt?
i dont see hp increases more than a couple hp coming from a stock engine with a timing change.

 

well i think with mods it makes more of a difference since the vvt can adjust to them and make better use of them with the right timing instead of a universal timing for all rpms

 

i certainly agree with that, but for modifying a stock 2.2l engine to handle vvt (if possible) i dont see it netting any significant gains until mods have been added.

 

VVT can spread the power band further, by advancing the cams low end power is improved and by retarding them high end power is improved. VTEC is completely different, when VTEC comes in another set of cam lobes is engaged which open the valves longer and/or further.

 

Hence why they are wound up like a cheap toy.

 

i saw some article on an engineer searching the forums trying to do this. i dont remember where the site was but does someone know anything about this?