3 cylinder as uneven firing

[Willie Williford]

Sorry, VTEC is activated at 2500-2800 rpm.
You feel it more at 3000-3200 rpm because the timing is finally going "full advance".
(Verified by monitoring the OBDIIC&C gauge.)

HTH
Willie

[eq1]

Originally Posted by theaveng

Except VTEC doesn't turn-on until ~3000 rpm. (You can feel the extra boost of power when it does.)

Based on my understanding of the system, if it's vtec that 'allows low rpm cruising' and an 'unstressed life', it doesn't matter that the high boost portion kicks in at around 3000 rpms; it's that the under 3000 rpm performance is dictated by a low lobe, low lift cam. But really, low rpm cruising seems to be possible due to a number of things, such as knock sensors, probably electric assist availability, maybe some other things - probably computer programming...

[theaveng]

Yeah I suspected VTEC turned-on slightly before 3000, between 2800-2900, but had no way of verifying. That's also the point where my lean burn stops working.

Originally Posted by Willie Williford

The motor does basically smoothes out the engine at idle only.

Really? I thought the motor would be smoothing the engine all the time, using that "trickle" charge that's constantly turned on.

[theaveng]

I just discovered Ford and Chevy also make 1.0 liter 3 cylinder engines.
- The Ford version is called a GTDI and uses direct injection like a diesel (~46 MPG)
- The Chevy version is identical to the 1.4 liter engine used in the Chevy Volt and CruzeEco, but minus one cylinder.
Wish we could get these three cylinders in the States.