Riverguy
Senior Member
- Joined
- Feb 17, 2013
- Messages
- 288
- Location
- USA
- Vessel Name
- Serendipitous
- Vessel Make
- Mainship 390, Bayliner 3258, Bayliner 4788
I don't think it is necessary to go to wot for 30 minutes. Tony Athens in the years before common rail recommended running a high output diesel up to 60% load which is typically 80% of wot rpm for about 20 minutes at the end of a long day at low speed to blow out accumulated carbon.
As noted above, I think that the advent of common rail has eliminated this requirement as it provides much more precise fuel injection.
Also I think my Yanmar 370 needed it because I often ran it for long days with only 15% load. Your Lugger is probably routinely loaded much higher which means the fuel injectors are being operated closer to maximum than mine, so it burns cleaner and produces less unburned fuel and soot.
David
Exactly right. I typically run both my single Yamnar 6LYA and my (twin) Cummins 6BTAs very gently, 1200-1400 rpm for long periods. Once every 4 hours of so, I spin them up to max rpm for 30 seconds, then back down to 2,400 or so for 5-10 minutes. I've seen no need to run at WOT for more than a few seconds, and no need to run at 60% loads for more than 10 minutes.
FYI, Tony still recommends spinning up the newer common-rail engines, but not as much or as long.
https://www.sbmar.com/community/topic/running-at-wot/