That is an interesting read. I learned something new as well today.

 

The Honda Prelude 5th Gen is two stage Vtec, The S2000 is Single.

 

3 stage vtec only occurs in SOHC motors.

The term "stage" is sort of misleading, as it is referred to in different ways.

With 3 stage, only one intake valve opens in very low RPM, then two, then the VTEC lobe kicks in at high RPM increasing lift and duration.

With 2 stage, IMO, this is just normal VTEC as we see in most higher end Hondas: ITR, Prelude, GSR, S2000. The GSR in particular has a IAB that opens in unison with the VTEC lobe engaging.

With single stage, only the intake side has a VTEC mechanism. The exhaust side is unchanged throughout the RPM band.

In any case, who cares?

 

My wife's '03 CR-V's engine has i-VTEC. How would you characterize that in terms of number of stages?

 

[QUOTE]Originally posted by Crabby Guy
[B]My wife's '03 CR-V's engine has i-VTEC.