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Old 01-08-2014, 06:37 PM   #1
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Question Cummins QSB 5.9

Am looking at trawlers and one memtioned a "slow idle cruise electronics option" on the diesel. Any information on this system would be appreciated.

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Old 01-08-2014, 08:21 PM   #2
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Originally Posted by DTBrad View Post
Am looking at trawlers and one memtioned a "slow idle cruise electronics option" on the diesel. Any information on this system would be appreciated. DTBrad
Maybe a trolling valve on the transmission? Otherwise i have no idea.
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Old 01-08-2014, 08:26 PM   #3
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Originally Posted by twistedtree View Post
Maybe a trolling valve on the transmission? Otherwise i have no idea.
I'm pretty sure that's what he's talking about.
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Old 01-08-2014, 08:42 PM   #4
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Must be this (below) which is listed under Cummins MecCrusier engine spec's that he's referring to. . . . way to new for my knowledge base?

Sea Cruise Package: Includes backup throttle, digital
interface, engine synchronization, cruise control, idle
speed control and slow idle.



.
.
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Old 01-08-2014, 08:46 PM   #5
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thanks, will do more research.
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Old 01-08-2014, 10:47 PM   #6
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From what I've seen "slow idle" is the option that drops idle RPMs from 600 to 550 (on Cummins QSC 500s). This allows smoother shifting while docking and obviously travel a bit slower in close quarters.

Trolling valves is something different. The name kind of speaks for itself. The RPMs don't change, but the transmission ratio changes and the props spin slower allowing cruise much slower which is adequate for fishing.
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Old 01-09-2014, 09:04 AM   #7
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Great Reply

Alex F,

Thanks for the info. Makes sense on a 42 ft trawler.

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