some help for timing

[UrS4boy]

are you sure about the drawing UrS4boy?
i think the i5 has a difference of 720/5=144° between one and the other
or I did not understand it

You did not understand it. That sketch is only dealing with No.1 cylinder, not the other 4 that fire 144 degrees later, respectively.

The purpose of the sketch is to show that the cam goes round twice as slow as the crank, i.e. it takes 2 crank rotations to rotate the cams once.

[ziopinulo]

anyway if flywheel can be mounted in only one position and i've checked that cams are in timing with TDC of first cylinder, my engine is ok...

[ziopinulo]

You did not understand it. That sketch is only dealing with No.1 cylinder, not the other 4 that fire 144 degrees later, respectively.

The purpose of the sketch is to show that the cam goes round twice as slow as the crank, i.e. it takes 2 crank rotations to rotate the cams once.

ok now i understand what you mean!