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Question about idling a 1955 271
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heron View Drop Down
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Joined: 01 Dec 2012
Location: Chattanooga, TN
Points: 109 		Post Options Post Options   Thanks (0) Thanks(0)   Quote heron Quote  Post ReplyReply Direct Link To This Post Topic: Question about idling a 1955 271
    Posted: 28 Sep 2016 at 9:24am
Quick question: I know the Detroits don't like low rpm but does it hurt the motor to low idle it or when sitting is it better to keep it at a medium idle. I've always heard to never low idle it, as fuel will leak into the cylinder but I wanted to make sure. 
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ac_sd View Drop Down
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Joined: 23 Apr 2011
Points: 194 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac_sd Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 10:08am
No prolonged idling of the "71 Seies" or other 2cycle detroits !  They will "load up" and start spitting oil !!  The manuals all recommend letting temperature stabilize at a high idle and then shutting them down !  Navy used them in everything and abused the heck out of them with tremendous reliability, but they didn't idle them very much other than to bring them up to temperature !
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heron View Drop Down
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Points: 109 		Post Options Post Options   Thanks (0) Thanks(0)   Quote heron Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 1:01pm
Okay, so don't let it low idle but if needs to idle just keep it about midway...that is what my dad always said but if I'm walking the machine, up and down on a low boy or trying to get it into a tight place a high idle is too fast...hence my question. Thanks much for the reply. This motor has always run like a top. At a lower idle it's smoother than my duramax. 
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wfmurray View Drop Down
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Joined: 13 Sep 2009
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Points: 1225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wfmurray Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 1:20pm
In trade school they said to let the engine surge instead of idle smooth. Keeps engine from getting to cool.
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Dan73 View Drop Down
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Joined: 04 Jun 2015
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Points: 6054 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dan73 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 1:30pm
The Detroit we had couldn't get out of it's own way unless it was opened up good then heaven help you she would walk off pulling the world behind her. But yes don't idle it we got in alot of trouble with people doing that waiting for the chopper to finish a load.
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Coke-in-MN View Drop Down
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Joined: 12 Sep 2009
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Points: 41484 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 8:56pm
Engine idle is a choice - I did but kept it up higher to be sure oil pressure was in operating range - big thing is if you are leaving machine set running do so with transmission in neutral and clutch engaged as the brass bushing in the clutch housing will be carrying the weight of the bearings and throw out levers unless you do . 
 There are grease zerks on the brass but even so the unit wears 
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ac_sd View Drop Down
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Points: 194 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac_sd Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 2016 at 9:24pm
If a 2 cycle Detroit is loping or "surging", the governor is not adjusted correctly !! idling it for short periods (loading the machine) won't hurt anything ! 
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