Run that engine before moving the car

skyactiv said:
My wife once had a 2012 Mazda3 with the Skyactiv engine. That car has a blue light when your engine is cold and it’s cold outside. My VW GLI makes decent heat in 90 seconds on a cold engine in 11 degree weather that hasn’t been ran in 10 hours. I don’t know how it does it.
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My GTI coolant temperature reaches 200 F very quickly after just a couple of minutes driving. So different than the Grand Cherokee V8. Is it because of the turbo in the VW?
 
Summer time, let them warm up for 30 seconds to a minute to come off high idle. Winter they get 5 to 10 minutes or more depending on weather. Defrosting the windows and warming up is more important than the few pennies/quarters in gas. Plus if the old trucks don't warm up in the driveway they will be cold for 20 minutes or more.
 
I put my seat belt on, i crank up and go into R or D immediately. As soon as i let of of the key or button, its in gear and moving. 14F this morning. I do keep the revs under 2500 for the first mile or so.
 
buster said:
Yeah when it's very cold I do believe you should at least let rpms settle before driving off. I also go very slow.
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Our 2015 Escape goes into high idle when it's cold. I simply put the transmission in reverse and the idle then drops to around 1000rpm. I'll then move the transmission into neutral for a minute. Then I'll finally put the vehicle in drive and let the vehicle slowly warm up while driving.
 
Allaned said:
My GTI coolant temperature reaches 200 F very quickly after just a couple of minutes driving. So different than the Grand Cherokee V8. Is it because of the turbo in the VW?
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EA888 has exhaust manifold integrated into cylinder head. Coolant passages go around exhaust runners. It warms up much faster, has better thermal regulation and mpg is better.
Out Tiguan needs a minute to start heat in subzero conditions.
 
ripcord said:
Where did you find that graphic? The wear rate on that one falls of a lot more linearly and quicker than the ones I'm familiar with.
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It's from SAE 770086 - The Effect of Oil and Coolant Temperatures on Diesel Engine Wear

The chart I posted is for a gasoline engine. The study shows another chart for a diesel engine that has a more gradual reduction in wear with increasing coolant temperature. Do you know where the other charts you've seen come from? Are they from diesel or gasoline engines?

Some more recent studies with gasoline engines also seem to show a pretty sharp inflection point, at a coolant temperature of 30-40°C. The inflection point seems to correspond to the point where the combustion chamber temperature rises above the dewpoint of the water vapour in the exhaust gas.
 
twX said:
It's from SAE 770086 - The Effect of Oil and Coolant Temperatures on Diesel Engine Wear

The chart I posted is for a gasoline engine. The study shows another chart for a diesel engine that has a more gradual reduction in wear with increasing coolant temperature. Do you know where the other charts you've seen come from? Are they from diesel or gasoline engines?

Some more recent studies with gasoline engines also seem to show a pretty sharp inflection point, at a coolant temperature of 30-40°C. The inflection point seems to correspond to the point where the combustion chamber temperature rises above the dewpoint of the water vapour in the exhaust gas.
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Thanks! I think the more commonly shown chart (the one that I'm familiar with at least) is from the 50's or 60's SAE paper "How Engines Wear." It's a more of a curve with a more gradual slope.
 
dadto2 said:
I only let my cars idle long enough to put my seatbelt on, then I'm off and driving like normal. In 35 years of driving, this has never damaged any of my vehicles in any perceptible way. I drive them until the body and frame rust away from the perfectly good drivetrain.
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Same, but I do idle into movement taking it slow and gentle.

Several of my vehicles NEVER heat up unless you drive.

Depending on your driving distance, temperatures and vehicle type a partial or full Grill block in the -15F and below area helps get heat and fuel economy up.
 
End of day at work , engine runs about 5seconds and I drive gently to on ramp 1/2 mile away and accelerate to 65 mph . It warms fast!! Wife does same on our older high mileage vehicles , no issues.
 
Patman said:
I get it, I hate winter too. But 40 degrees is not winter weather. I would love it if it warmed up to 40F right now.
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I should clarify… it’s more like 3-15 minutes, anything under 5 is me sitting in the truck doom scrolling TikTok waiting for the windows to defrost. Below 20F is when I do the 15 minute warm ups… and only when leaving work. And it’s only 15 minutes because that’s how long it takes to clean and oil my engine lathe and surrounding area. Otherwise yeah, I ain’t wasting my gas idling, it’s better spent at 4500rpm+! Get in and go, usually don’t even wait for it to come off high idle.

I do NOT have remote start, so I have to walk my frozen butt out into what resembles Hoth right now and start it myself… or send a child if I’m at home because they live for that


IMG_9649.webp
 
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