best warm up patern in winther.

Posted by: shDK

best warm up patern in winther. - 01/20/14 07:52 PM

Hi all.

I am gonna share a discussion with you all that,s bin up here during the winther. Should you let your engine warm up a bit before driving?perhaps the time it takes to scrape off ice from the Windows. Or remove ice first and then just start and go?

The side on the start and drive made the following points.

1. The catalyst converter don,t work till the engine is warm and therefore will pollute more.

2. The engine doesn't warm up at idle but has to work before getting warm.

3. You will delute your engine oil with petrol due to blowby(or undercompression as it,s called here). And incomplete burning(don,t know how else to translate it)

4. Many modern engines has a pretty low oilpressure at idle, to reduce internal mechanical drag. And therefore. The wear is bigger.

The side that,s for letting the engine idle while scraping of ice.

1 the engine will mostly need between 15-20 sec before being fully lubricated(Probertly mostly with older thicker types of oil and engines.

2. The idle at cold start is often pretty high. An example is my Mazda that idles at 2000 rpm at cold start. Therefore it incomplete burning ain,t that big a problem.

3. In favor of safety it is best if the car is free of any moist of the Windows before ddriving. It is hard when you do the start and go way.

So. What do all the experts here say? This winther has bin really mild. But a normal whinther we will have night temps down to -15--20 celcius..

I apologize if my spelling is bad. I am sitting up at night, becouse I have the pneumonia. On both lungs. So now at is tea and rum time:-)

Have a nice day.
Søren

Posted by: Donald

Re: best warm up patern in winther. - 01/20/14 08:02 PM

I do not see a need for a long warm up, but warming up the car while one scrapes ice off the windows seems reasonable. But if its cold and no ice, then as soon as I see oil pressure in my gauge I will drive off.

Now if its below 5F my Jeep makes some odd engine noises, so I wait until the engine sounds normal (which might be a minute or two) then drive off.

And then there are the days I use the remote starter because I do not want to be cold.
Posted by: Danno

Re: best warm up patern in winther. - 01/20/14 08:06 PM

Hey shDK - Get better soon. You are warm this winter, we are cold, expecting -30C tonight without wind chill -42C with wind chill. Using 0W-20 M1 in the 3 cars parked outside. 2 cars parked inside get 5W-20/30 (warranty required)

I like your second option the best.
Posted by: eljefino

Re: best warm up patern in winther. - 01/20/14 08:48 PM

This keeps coming up. There are lots of threads from a couple weeks ago during the "Polar Vortex" on this very subject.

I nod to safety, particularly fogging up windows. So I idle, destructive as it may be. My goal is to counteract this with better maintenance, and not eliminate it. I own my car; it doesn't own me.
Posted by: KB2008X

Re: best warm up patern in winther. - 01/20/14 08:52 PM

My rule is that I'll wait five to 10 seconds in the summer and then drive. That works well until the freezing point and then I'll add another 5 seconds, when it gets near 0 Fahrenheit I'll wait maybe 30 seconds. Waiting longer really serves no purpose. There is nothing wrong with waiting longer for whatever reason, you may not gain much, but there is no harm.

The thing to keep in mind is that it's not only the engine that needs to have oil circulated throughout before driving off, regardless of temperature, but the transmission, power steering, drive axle, etc. The colder it is the longer it takes for fluids to circulate. So, once you're rolling, go easy for a few miles and then let it rip.

As for making allowances for "incomplete burning", or letting the converter warm up or pollution, don't worry about that. If you're really worried about pollution ride a bicycle.
Posted by: crazyoildude

Re: best warm up patern in winther. - 01/20/14 09:00 PM

at 20 degrees i let them warm up 5 to 7 minutes in the summer i let them warm up 2 minutes
Posted by: sciphi

Re: best warm up patern in winther. - 01/20/14 09:14 PM

Start it, put on the seatbelt, tune the radio, and go. That usually takes 10-15 seconds. The manual transmission isn't lubricated unless the car is moving, so I use a quality synthetic lube in there.
Posted by: gregk24

Re: best warm up patern in winther. - 01/20/14 09:27 PM

Just because the engine has oil pressure doesnt mean its lubricated. I let it idle until the rpm starts to drop down, then I put it in drive and take it easy until its warmed up.
Posted by: Doog

Re: best warm up patern in winther. - 01/20/14 09:48 PM

below 20F I let it sit for 10 minutes. In Summer...30-45 seconds.
Posted by: expat

Re: best warm up patern in winther. - 01/20/14 09:55 PM

I would say much depends on how hard you will work the engine once you get going.
I have the luxury that I have about 1 minutes driving before I need to even get up to 50kph.
So, (unless I need to scrape) I start and Go.
Posted by: spasm3

Re: best warm up patern in winther. - 01/20/14 09:57 PM

I agree its better to start up and drive off leisurely. But I have wondered about situations in cold weather where you have to accelerate into traffic right off the bat. Are you better to let it run 5 minutes or just start up and go even if you are hitting say 4k rpm?
Posted by: Finz

Re: best warm up patern in winther. - 01/20/14 10:12 PM

Originally Posted By: crazyoildude
at 20 degrees i let them warm up 5 to 7 minutes in the summer i let them warm up 2 minutes


+1... Maybe it's a jersey thing.
Posted by: gathermewool

Re: best warm up patern in winther. - 01/20/14 10:56 PM

Originally Posted By: gregk24
Just because the engine has oil pressure doesnt mean its lubricated. I let it idle until the rpm starts to drop down, then I put it in drive and take it easy until its warmed up.


That's pretty much exactly what it means...

I like the thought mentioned above, that my vehicle serves me, not the other way around. When I'm by myself, the temperatures aren't ridiculously low, and/or the humidity doesn't mean instant-visibility-killing fog I clear the windows, if applicable, start, and drive off. Otherwise, I'll warm'er up for a minutes while clearing snow and setting the defroster on high, or remote-start and let'er warm up if that's what I want that time.
Posted by: bvance554

Re: best warm up patern in winther. - 01/20/14 11:06 PM

When i was a kid back in the 80's my neighbor would wake me up in the morning 'warming up' his car. His 'warming up' consisted of starting the car and holding his foot on the accelerator revving it to ungodly rpm's for about two minutes, then drop it in drive and go. Even as a kid i didn't think this was the best method. For me, start it up, i can scrape the windows in about a minute, then drive it easy.
Posted by: JHZR2

Re: best warm up patern in winther. - 01/20/14 11:17 PM

Modern cars with properly working and heated O2 sensors should go closed loop pretty fast. How well/fast they get out of the algorithm holding idle a bit faster may be a different story. However if you can go closed loop, you don't have a ton to worry about.

So IMO the best thing from an engine longevity point of view is to use a block heater if equipped, then to start the car, let it stabilize for a few seconds to perhaps a minute at most, then go. Driving should always be gentle, but especially for the first 20 miles/minutes. However, that's the case in ANY weather. When combustion processes are over 1000 degrees, and cooling systems are designed to disperse all heat in >100 degree conditions, the difference in operation from a cold design day to a hot one is kind of small.
Posted by: Pop_Rivit

Re: best warm up patern in winther. - 01/21/14 06:27 AM

Originally Posted By: shDK
best warm up patern in winther.


Get in, start it up, and then drive.
Posted by: datech

Re: best warm up patern in winther. - 01/21/14 06:42 AM

I think if you are concerned about cold operation use a heater to preheat the engine. Sometimes I even preheat the interior with a small electric heater.

It takes me a little time to put on my seat belt on, back out of my driveway, etc., but an extended warm up doesn't help.

I think as long as you keep engine RPM low, maybe below 2000, the engine can't tell if you are creeping along in drive or just sitting, but it will warm up quicker with a touch of throttle and rolling 30 - 40 mph.
Posted by: dlundblad

Re: best warm up patern in winther. - 01/21/14 07:08 AM

Does fuel dilution burn off like moisture in oil after you take the vehicle on the highway for a half hour? Or so it there to stay and contaminate the oil?
Posted by: supton

Re: best warm up patern in winther. - 01/21/14 07:28 AM

Depends upon how much ice is on the car, and temp. 20F and up, I don't mind driving off after maybe 10 seconds--you know, get in, start, buckle and adjust stuff, then drive. I might do that at 10F or even 0F, although at 0F I'm usually running back inside to warm up... And the idle is usually kinda rough, clutch stiff, etc.

But even at -10F I don't think I've ever let it go past 10min to "warm up". I don't think it needs more than 2-3 really. More for my comfort.

Now, getting ice to melt is a different issue. After Christmas I had to let the truck idle for about 20min. It had been parked for a couple weeks, and there was a nasty ridge of ice above the wipers. You know the sort, where it won't scrape off w/o hammering. I think it was during the polar whatever also, so it was stupid cold. Normally I don't need to warm up a vehicle to get ice off, but once in a while it's just really really stuck on, and a bit of heat seems best.

What I hate is when the windshield gets scraped off, and then freezes back up once you take off down the road, as there isn't any heat coming out of the defroster yet. That's annoying.
Posted by: datech

Re: best warm up patern in winther. - 01/21/14 08:02 AM

I have read that some planes used in the Artic are equipped with a mechanism to dump a small amount of fuel in the engine oil.

It's used just before shut down so the next day start up will be easier. When the engine oil heats up the fuel evaporates leaving the correct viscosity oil for proper engine lubrication.
Posted by: grampi

Re: best warm up patern in winther. - 01/22/14 07:29 AM

I let my car warm up for 10-15 mins when it's extremely cold, 5-10 mins when below freezing...I know some say it's not good for the vehicle to let it warm up for that long, but I routinely get 200K-300K miles out of my vehicles, so I'm guessing it can't be doing too much damage...besides, who likes riding in a cold vehicle and having to scrape windows?
Posted by: cp3

Re: best warm up patern in winther. - 01/22/14 08:02 AM

-26C (-15F) here this morning. I'm car pooling this week so the Charger is still frozen but I plugged the G6 in before I left.I will get about 2 hours before the wife leaves. To me that's better than the remote start for 10 minutes.

Once it's below freezing my typical routine is to start it and clean it off before I leave. Haven't really let the cars run just to get heat since the kids were little.
Posted by: Bamaro

Re: best warm up patern in winther. - 01/22/14 10:26 AM

Some people are WAY too anal about warm-ups!
Posted by: TFB1

Re: best warm up patern in winther. - 01/22/14 12:20 PM

Originally Posted By: Bamaro
Some people are WAY too anal about warm-ups!


Mostly due to the anal vortex that pulls them into BITOG...

If it's below 50F I usually idle mine four or five minutes then add another minute or two for each 10* below that...
Posted by: Clevy

Re: best warm up patern in winther. - 01/22/14 02:08 PM

Disclaimer: I'm referring to temps in Celsius.

If its -15c or warmer I don't even warm it up. I get in,start it,light a smoke,roll down the window a crack and drive. I've got 15kms of side roads that are too rough to drive any faster than 80km/hr-50mph so the engine gets driven very easily til I hit the highway.
By the time I've hit the highway junction the oil temp is 160+F so I accelerate quickly to 110km/hr-70mph and cruise to the city.
In temps colder than -15c I'll let it warm up a bit,if its -30 I let it warm up til its blowing hot air. -30 is darn cold. I pay for the fuel,maintenance and everything else on the vehicle so I couldn't care less what the bitog police think.
My vehicles are an appliance and built to serve me. It's just that simple.
Try turning the wheel at -30 in a cold car. The tires are frozen slightly out of round and it takes a mile or 2 for the thumping to stop.
If it isn't -15 and warmer then minimal warm up is required. Don't rev past 2000rpm til oil temp is at 160F and drive sensibly.
At -30 your breath with frost up the windows in minutes,and that's not safe. Visibility is important so if it means warming up my car to attain clear windows then so be it.
And my comfort is of the utmost importance to me. Why would I want to suffer being cold when my appliance can provide heat.
Posted by: KB2008X

Re: best warm up patern in winther. - 01/23/14 06:22 AM

Originally Posted By: TFB1
Originally Posted By: Bamaro
Some people are WAY too anal about warm-ups!


Mostly due to the anal vortex that pulls them into BITOG...



Anal vortex !? oh that's good. I may have I popped on stitch on the hernia repair with that. lol
Posted by: rjundi

Re: best warm up patern in winther. - 01/23/14 06:32 AM

Hmm. Wife leaves her 2005 Legacy/165k idling about 5 mins in the morning to make sure defrost working and car warm. At work she gets on highway within 1 min out of parking lot (no warm up) and is going 70-80mph.

It makes no difference in longevity of vehicles.
Posted by: Thermo1223

Re: best warm up patern in winther. - 01/24/14 02:14 PM

^^^

I did that to the older Forester daily during the work week.

Revved to 5000 rpm in first to get on the highway from a dead stop.

Never seemed to care.
Posted by: andyd

Re: best warm up patern in winther. - 01/25/14 06:04 AM

Oh man, The cold start is where a modern engine with modern oil in it shines. It is so easy to start. 4F and I start the Transit van without touching the pedal. I set the heater on defrost and went back in to pack my lunch and coffee. 10 minutes later I'm back out and the crusted ice on the windshield is slush. The mouse fur upholstery is way better on my posterior than vinyl or leather too. So I hit the road with warm car that I can see out of. If the windshield is clear, I'm idling down the driveway in a cold car. The sooner the car warms up, the sooner I will. laugh
Posted by: demarpaint

Re: best warm up patern in winther. - 01/25/14 06:11 AM

I just don't like the idea of engaging a clutch or shifting a transmission into D or R when a cold engine is racing. I wait for the tack to idle down to 1,000 rpms and then go. That seems to have worked well for me since I started driving in the 70's. But then again I don't live where it gets to -30°F or colder either.
Posted by: TiredTrucker

Re: best warm up patern in winther. - 01/25/14 12:29 PM

I suppose that if one is starting their vehicle after sitting all night and within the next few second, merging into 70 mph traffic on a freeway, then some form of warm up would be in order. But most of us have at a least a little bit of driving at a reduced speeds on streets before hitting the big road. An engine will warm up faster under moderate power than sitting at idle. After maybe a minute, mine is going to go into drive and I am going to head out. If the cold is something really blistering in the morning, the get a block heater, oil pan heater, and maybe a battery heater pad. That would be better for your engine than starting at extreme cold on it's own. These items are not that expensive, use little electrical power, can be put on a timer, and take a lot of strain off of an engine at startup in extreme cold.
Posted by: supton

Re: best warm up patern in winther. - 01/27/14 11:52 AM

Heh, I found myself annoyed with myself this morning. I took the truck, but as it was warm (like 18F) I didn't bother with warming up. Coming down the hill I wasn't thinking and forced a downshift, making the truck go into fuel cutoff. After going through the light and getting up to 55mph I had to endure at least 2 miles of driving with the trans refusing to go into high gear and lockup.

Teaches me about trying to save fuel and brakes!
Posted by: Eddie

Re: best warm up patern in winther. - 01/27/14 12:04 PM

I wait till the engine comes off the fast idle before driving easy till full wanrm. Usually comes off the fast idle within 20 seconds. Ed
Posted by: D189379

Re: best warm up patern in winther. - 01/27/14 01:18 PM

Someone should just make a sticky with all of the pros and cons of each method so this thread doesn't keep popping up.