Idle up or not?

Personally I think they should be idled for a couple of minutes when very cold to get some oil flowing. Then increase to 900-1200 for warm up.

 

With lighter weight engine oils and commonrail fuel systems offering more injection events and more complete combustion the need for long warm up periods are long gone. Pretty much get air pressure and go. Older engines will tend to need longer warm up periods.The fastest way to warm the engine is to work it, not idle. Idle bump if you feel the need or to get the windows cleared. Reving a cold engine is never a good idea, no matter the engine. Hot loaded- Idle a few minutes before shutdown too allow turbo/exhaust temps to fall a bit if working the engine hard before shutting down.

 

Be nice to your engine and it will be nice to you. You don't have to warm it up until the snow slides off the hood, but when it's cold out, even multi viscosity oil moves like 2 a.m. truck stop coffee. Cast iron likes to warm up slow and cool down the same way.

 

My series 60 goes to 900 rpm as soon as I hit the key if it is cold out. It' is in the program nothing I can do about it.

It comes down to 600 as it warms up .

 

If a newer EPA motor, leave it alone. Let her do her thing.

 

Idle it up. He is flat wrong.

It's to increase cylinder heat..

 

Emissions motors also should idle up... Cold smoke causes all sorts of problems with emissions and you can reduce that by idling up.

 

Personally, I always idle up to 900 RPM after 30 seconds of idle/oil circulation. With newer engines it is not really nessacary because they are actuating turbo/throttle valve/ or backpressure valve to load engine to get engine and after treatment up to temp so I they can start monitoring NOx emissions. It is all about emissions! I can't bear to watch or listen when someone fires up one and holds it to the floor.