Completely satisfied. Did it this fall and admittedly was super nervous; 2011 hull with the A versions of the F350s; so if Yamaha, 300s were only option Went to all digital - f300nsb2s that have some of the xto features. Only ran to 20hr service : maybe lost .5mph off top end, but 15-20% more efficient.
Thank you for the great answer. I kept the 350s too long and appreciate your input on the 300s
You're welcome. I get it, was in same situation and its not a good feeling to think I was going to destroy a boat I loved by underpowering. What finally sold me was the dealer's point to me that they sold the hull with twin 225s for years on the express 330, so you will be fine (just search express 330 225s for an endless amount of threads wondering if its underpowered).
Umm, honestly I don't think that the 336 will be underpowered with twin 350 as it is not sooo much different than the 306 and the DF350 with his duo prop or the brand new BF350 should be plenty of power to move the 336 reasonable fast.
Just bumping this thread as an update as I now have 120 hours on my repowered Canyon 336 with twin F300's (nsb2s). Still completely satisifed (if not more so), just like this poster with his Express. Highly highly recommend the full helm master, after a bit of practice it makes the bow thruster obsolete, and the staypoint etc are really nice features to have solo. Still managing better than 20% fuel efficiency improvement compared to the old V8 350s.
I am now considering the f300s versus the new 350s. I am encouraged by the report concerning the f300s. How does it perform at 3500rpm, 4000 rpm, 4200 and 4500rpm. When it is rough, I tend to hang in the 3500 to 3800 zone and need to understand speed and efficiency. When calm, 4400 to 4500. Can you give me some intel?
Chris. What is the calculated knots column? The red is the actual knots with a dirty bottom, right?
That is what I have now on my 336. Thank you. But my aim is to repower the 336.Hi gents,
Take a look at the performance in the link for reference. My 306 with "C" Series F350s (19P props, I believe) runs almost spot on with the info below. Knock 1 - 2 MPH off their performance for bottom paint, etc. and my performance is very close. My numbers are very close to the Yamaha Performance Bulletin for the 336 with F350s running a 17P prop. Hopefully this gives you some more reference points.
Grady-White Canyon 306 (2017-)
Grady-White’s Canyon 306 is a boat that combines rugged, sport fishing character with a level of comfort and accommodation in design that leaves it available to double as a family boat as well. She is 30’ 6” (9.3 m) LOA, and 10’7” (3.23 m) wide, which is relatively beamy for this length in...boattest.com
calculated theoretical speed based soley on rpm, gearing, and prop pitch
The calculated knots are hypothetic speed with zero slip engine rpm/LU gear reduction * propeller pitch
Happy to try to. Now at 320 hrs on the f300s' on my Canyon 336 after a full season, still completely satisfied. One big caveat is that I switched to Powertech OFS4 15 pitch 4-blade props mid-way through as I didn't like the low end planing threshold when running at night (wth the 3-blade SWS II 15 3/4" 15 planing was about ~4000 rpm), and I was doing more (tuna) trolling. Over 10 150-250 mile tuna trips now, and I have seen 20-40% efficiency gains from the f350 (version a's) that I had on with a mix of running, trolling, run & gunning etc.
