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Let Engine Idle or Turn Off? #5284045 12/03/19 02:24 PM
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lancerplayer Offline OP
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I have a Polaris Ranger 500 EFI that I use on property to do 50% work and 50% play. Engine is a 500cc, single cylinder, 4 stroke, OHV, and fuel injected.

This is a new to me machine and I find myself driving to an area of the property, getting out to do work, then moving on to the next area. There are some tasks that take 10-15 minutes to do before moving on to the next area.

My question is: is it better to let the engine idle or to turn off when off the machine doing 10 minute tasks? Anything over 15 minutes, I shut off the machine.

The motor gets full synthetic engine oil. It gets to operating temperature (fan kicks on at times of idle), and sees its fair share of high revs when riding for pleasure.

Which is easier on the machine....the constant idling or the on/off, on/off, on/off cycle?



Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284053 12/03/19 02:33 PM
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demarpaint Offline
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The most I'd let it run once warmed up would be 1-2 minutes. I wouldn't idle the engine more than that while doing tasks.


God Bless Our Troops

Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284068 12/03/19 02:46 PM
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ragtoplvr Offline
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efi engines have precise fuel control, so idle does not result in rich mixtures washing lube oil off cylinders. So other than getting hot, and the fan having to run, and the fuel consumed, there is not much difference.

In the winter, I would let it run so the oil gets hot at least once a day to help evaporate water. Otherwise shut it off, save fuel and emissions.

My BMW motorcycle really never heats up in winter, so I will let it idle once a week until it hits 5/6 bars to evaporate the water.

Rod

Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284071 12/03/19 02:46 PM
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LoneRanger Offline
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Not to worry, automotive start/stop technology is coming to an ATV near you, soon !!!



'19 Ford F150 2.7 twin turbo GDI V6 .....(Motorcraft 5W30 SN+)
'19 GMC Terrain 1.5 turbo GDI I4...........(GM 0W20 dexos)
'16 Moto Guzzi 1151cc air cooled v-twin (Eni 10W60)
Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284087 12/03/19 03:04 PM
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toneydoc Offline
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Any potential idling greater than 30 seconds and I shut down my engines


1994 Jeep 166k NextGen 10w30
2014 Camry 43k Castrol Magnatec 0w20
2018 Jeep Cherokee 7k Pennzoil Platinum 5w30
2014 HD Ultra 51k Mobil1 15w50
Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284107 12/03/19 03:29 PM
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krismoriah72 Offline
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I would shut it off. You are putting extra hours on your primary clutch which still spins and possibly can cause a flat spot on the belt..as it rides on the primary while idling.

Not counting the extra hours you are accumulating.. if i was working alone i would rather hear an animal or person coming than to listen to the engine.

Re: Let Engine Idle or Turn Off? [Re: toneydoc] #5284278 12/03/19 06:13 PM
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JHZR2 Offline
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Originally Posted by toneydoc
Any potential idling greater than 30 seconds and I shut down my engines


I believe I read that number “factually” (some analytical work) years ago.

Don’t delivery trucks like UPS and FedEx shut down every stop? If they do this for short, quick residential deliveries, it must be sufficiently low wear and tear on starters and the battery, to justify that the fuel savings is greater.

I’d shut it down and not think a thing about it.

Far more concerned with shutting down after a hard, heavily loaded run. It doesn’t sound like this use profile is hard running between stops.

Re: Let Engine Idle or Turn Off? [Re: JHZR2] #5284344 12/03/19 07:03 PM
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user52165 Offline
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Originally Posted by JHZR2
Originally Posted by toneydoc
Any potential idling greater than 30 seconds and I shut down my engines


I believe I read that number “factually” (some analytical work) years ago.

Don’t delivery trucks like UPS and FedEx shut down every stop? If they do this for short, quick residential deliveries, it must be sufficiently low wear and tear on starters and the battery, to justify that the fuel savings is greater.

I’d shut it down and not think a thing about it.

Far more concerned with shutting down after a hard, heavily loaded run. It doesn’t sound like this use profile is hard running between stops.


I asked my UPS driver about this. He said it was more for preventing a smash and grab intruder making off with the truck. It's happened.

Last edited by user52165; 12/03/19 07:05 PM.
Re: Let Engine Idle or Turn Off? [Re: JHZR2] #5284371 12/03/19 07:20 PM
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69GTX Offline
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Originally Posted by JHZR2
Originally Posted by toneydoc
Any potential idling greater than 30 seconds and I shut down my engines


I believe I read that number “factually” (some analytical work) years ago.

Don’t delivery trucks like UPS and FedEx shut down every stop? If they do this for short, quick residential deliveries, it must be sufficiently low wear and tear on starters and the battery, to justify that the fuel savings is greater.



When this was instituted at my plant for delivery vehicles (about 50 visiting per day - sometimes waiting in line for 10 minutes) the reason was environmental concerns from the state. The idea was to reduce excess vehicle emissions. I don't think it has much to do with wear and tear and it does for meeting state environmental requirements....at least in Connecticut.

Connecticut law prohibits vehicles of all kinds from unnecessary idling for more than three minutes. Provisions are made for weather ex- tremes, certain service vehicles and health-related conditions.


----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5284798 12/04/19 10:01 AM
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ragtoplvr Offline
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Most of the semi delivery trucks shut down as soon as they dock. In the cold of winter and heat of summer the driver will often let them idle. They will then shut down automatically after a few minutes. However his cab is still quite a bit warmer or cooler when he does get back in

Our business is manufacturing repair parts for starters, so we like it. We sell several kinds that upgraded from OE

Rod

Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5288488 12/08/19 12:03 PM
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totegoat Offline
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I don't let any engine just sit and idle.

Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5288503 12/08/19 12:36 PM
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Aero540T Offline
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My boss had his rear hatch glass on his Excursion replaced and the glass guy left his van idling the entire 1-1.5hrs he was working on it. We couldn’t figure out why he didn’t just shut it off.


2004 Jeep Grand Cherokee Limited 4.7L (wife’s) PUP & FU
2002 Ford Taurus 24V M1HM & M1EP
2001 Dodge Ram 1500 5.9L 4x4 10w-30 RP & FU
1993 Yamaha FZR 600
Re: Let Engine Idle or Turn Off? [Re: lancerplayer] #5289487 12/09/19 03:01 PM
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sw99 Offline
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If the Polaris has a CVT transmission and you've been riding hard, its good to let idle in neutral for a few minutes to cool the belt.




Re: Let Engine Idle or Turn Off? [Re: Aero540T] #5289562 12/09/19 04:07 PM
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BearZDefect Offline
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Originally Posted by Aero540T
My boss had his rear hatch glass on his Excursion replaced and the glass guy left his van idling the entire 1-1.5hrs he was working on it. We couldn’t figure out why he didn’t just shut it off.

Internet service provider crews do this too.
Likewise I see furniture delivery crews doing this all the time.
They will leave their big box trucks idling for an hour, for no good reason I can determine.
I suspect they would shut off the engine if they were paying for the fuel.

In contrast, the vans and trucks that belong to privately owned small businesses are shut off promptly.

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