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Old 07-18-2019, 12:05 AM   #1
Kawini
Senior Member
 
City: Santa Fe, NM
Vessel Name: High Slack
Vessel Model: Selene 43
Join Date: Aug 2013
Posts: 152
Cummins QSB 5.9 HO

Greetings. Can someone shed some light on the difference between the HO (high output) version of the Cummins QSB 5.9 and the non-HO version of that same engine?

Assuming that the engines are equally responsibly maintained and run for a similar number of hours per year, should I expect any significant difference in maintenance needs or longevity?

How about performance characteristics? Is one appreciably quieter? Smoother? Should I expect a significantly different fuel burn on the HO version?

I ask because I’m looking at two boats that are substantially identical except for the fact that one has a QSB 5.9 305 and the other has a QSB 5.9 330 HO. Both engines appear to have been impeccable maintained.

What are the relevant differences between the two engines that I should know about? Thanks very much in advance.
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