whats VTC and VTi??

[Amaury_Reno]

whats VTC ? and whats VTi????

 

[lumek4]

you dont know what v-tec is. put it this way it has more power than GOD. a vti is the closest thing a poor man can get to a ek9.

 

[Amaury_Reno]

nono i understands VTEC, but whats VTC and VTi? all i noe is VTC is Variable Timing control found in i-VTEC system, something to do with the cams, but still couldn't get a clear answer.....than what bout VTi?

 

[switch9]

Vti = 6th gen civic with B16A2 engine (so it is a CAR)
So this has nothing to do with a mechanism of an engine. It's just a type name for the civic.


VTEC = mechanism that activates another cam profile at high rpm's
at low rpm's --> normal intake and outlet cam lobes are active
high rpm's --> agressive intake and outlet cam lobes are active

this is a good movie that shows it:
YouTube - How VTEC works


i-VTEC = intelligent VTEC
= normal VTEC + VTC
VTC = variable timing control
VTC is a mechanism that is mounted on the intake camshaft. It can make the camshaft rotate (a little bit) independent from the timing chain. This way you can control the TIMING for the intake camshaft. This timing is constantly controlled by the ECU and doesn't have a fixed rpm to kick in.

So in fact, an i-VTEC engine is a VTEC engine with the addition of a mechanism on the intake camshaft to adjust the timing of it.

 

[blinx9900]

VTC is cam phasing, its basically like a computer controlled adjustable cam gear on the intake side, it can advance or retard cam timing + or - 50 degrees i believe...

 

[Amaury_Reno]

means that it can delay the cam lobe or fastened the cam lobe by 50 degrees, is that so?

 

[blinx9900]

means that it can delay the cam lobe or fastened the cam lobe by 50 degrees, is that so?

exactly.

 

[Amaury_Reno]

thnx blinx, but, exactly how does this help i-VTEC? delay the cam lobe when in low rpm for better torque and fastened on higher rpm for enough air to boost HP?

This way you can control the TIMING for the intake camshaft. This timing is constantly controlled by the ECU and doesn't have a fixed rpm to kick in.

and based on this statement, what triggers that VTC? Throttle Reponse or Engine Load?

 

[switch9]

and based on this statement, what triggers that VTC? Throttle Reponse or Engine Load?

Both in fact, and lots of other 'sensor values'.
The ECU takes a lot of different factors together and calculates the best timing for the intake camshaft at that time.
The major purposes of the adjustable timing are fuel economy on low rpm's, more power on higher rpm's, and better engine response when you instantly demand power of it (ex. flooring the gas pedal).

+ or - 50 degrees i believe...

I thought it could move about 50° in total, so about 25° advance, and 25 retard.

 

[Amaury_Reno]

thanx switch9 on the info !!