"Parmas" Motor

[rob323]

So does the vvti just retard the cam, or advance it?

[Parmas]

Originally Posted by rob323

So does the vvti just retard the cam, or advance it?

The VVTi retard and advance the camshaft angle based on the engine:

- RPM
- Temperature
- Load

If you see the image below you can notice that the camshaft is being advanced or retarding according these factors. Although there are six diagrams of camshaft angles, three of them are matched with others. I marked them for you to understand with ease.

It is hard to notice correctly if the overlaps are the same but if you see accurately, the camshaft angle figures are labeled with a 7-digit number. Some of them are actually the same label so it makes me think that infact they are at the same position.

So lets make a summary of this:

Camshaft Angle 1 - Fully Retarded

During idling \ Light Load (1a) = At Low Temperature (1b) = Upon Starting \ Stopping Engine (1c)

Camshaft Angle 2 - Fully Advanced

At medium Load (2a) = In low to Medium Speed Range with Heavy Load (2b)

Camshaft Angle 3 - Retarded but more advanced than Angle 1

In High Speed Range with Heavy Load


Still.... if you notice the 2nd and 3rd diagrams you will notice that the valve has only two ports and not three, which I am thinking are Angles 1 and 2. So that makes me think, where would the valve be at Angle 3?

[Yaris Hilton]

Got a link to that 1NZFE Spec Details.pdf document?

[Parmas]

Originally Posted by Yaris Hilton

Got a link to that 1NZFE Spec Details.pdf document?

http://www.autoclub72.ru/forum/index...e=post&id=1552