- Dec 8, 2020
- Reaction score
I know the HPDI V6s run as a V4 at lower RPM to minimize fuel consumption. That's all fine and good, I guess. But my outboard is decidedly unsmooth when in V4 mode and in gear. Idle in neutral is OK, but when in gear and running slow between 600 & 1200 RPM it shakes noticeably and sends vibrations throughout the boat. Once the RPMs come up to 1300+ things begin to smooth out and then from 1600 on up it is awesome (smooth, powerful, puts out a nice growl, and really moves the boat). So my question for those of you more experienced than I with these HPDI motors -- is this normal and something I have to live with or should the engine run relatively smoothly in V4 mode with little or no shaking felt forward at the helm?