Why is turbo coking a common problem with engine oils?
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- Опубликовано: 10 сен 2024
- The turbocharger for an engine runs at a very different set of operating conditions than the rest of the engine. It spends much faster, sees higher temperatures, but must still be lubricated by the same engine oil. This is a recipe for rapid oxidation.
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This site is one of the best sites for us geeks who think there is more than just "oil is oil, it's all the same". It's addicting, I love the technical stuff. Thankyou!
Thanks mate!
First ever I got an idea you have such a possibility with turbo chargers. Thank you.
No worries!
Around 1:15 you said that the hot exhaust gasses do not go directly to the turbo, but instead will pass through an intercooler first. This is not the case; an intercooler cools the air that is being forced into the engine, between the turbo and the intake.
Good point - so this is actually interesting. I come from the aviation/industrial world (aerospace engineer then worked as industrial lubrication specialist). Many piston aircraft and marine/power engines operate multi-stage turbos. In these instances the "intercooler" works on the air between turbo stages whereas an "aftercooler" operates on the air between the turbo and the engine intake.
@@LubricationExplained Yes an aviation expert. Woohoo.
I think what OP meant was aftercooler, in which exhaust gas is cooled by heat exchanger before entering turbo. This is pretty common in marine and industrial diesel engine.
The wrangler manual for the 2.0 turbo has a matrix that recommends idling for specific amounts of time based on the kind of driving prior to shutdown.
Awesome vid, there's a Ford channel recommending 3k mile intervals for the escape due to small sump capacity, direct injection and turbocharging. It's the first time I've ever seen 3k mile changes make sense
Wow! 3k! So short...
Most Ford's for some reason recommend Syn blend oil Don't know why I personally use full synthetic typically Castle Edge or Amsoil haven't had any issue currently at 93k miles.
Would be good to see a video highlighting the (negative) effects of modern ECU engine tuning on oil and parts that will necessarily see higher pressure and temperature levels. I am thinking of pistons, valves, turbos, OPF and catalysts. I think this topic is highly underrated because people think that OEMs have built some margin and as long as you change the oil much earlier than recommended, you should be fine. A wrong perception in my view.
That's a super specific video 😄 Let me see what I can do.
You need an oil with higher HTHS and higher viscosity to combat the extra heat and wear. Ester based group 5 oils are typically what people use, if they know what they are doing and doing things correctly that is.
Can you say a word about watercooled turbos? and cooldown? More specifically - lots of people talk about how the need for a "cooldown idle" is diminished when you have auxiliary cooling for the turbos, but it seems to me that when the oil & shaft itself aren't spinning while this cooling down happens, you still leave a lot of room on the table for things to happen. Might be another plus point for separated hot/cold (i.e. electric) turbos...
I think this mainly applies if you're running the engine real hard - so for example if you're at the track. Most modern light duty vehicles don't really run hot enough for a fast shutdown to become a problem. Or at least, that's my take on the situation.
Don't listen to these guys with a sub 300 hp turbocharged car in their first years of having a driver's license. Most of this "knowledge" they have is bogus. Just because they drive 20 past the limit on the highway they think that they've maxed their car out and done what no one has done before. Any street car without aftermarket turbos or upgrades which up their stock power over 50% can take the cooldown without a problem. You could drive off the highway and instantly turn it off, nothing bad would happen, not even if you did this every day. All cars beyond 2009 have a cooldown sequence and monitor the various temperatures.
If you track your car thats a whole other story
@@User-th6yy I don't have a turbo in any of my cars and I'm not really listening to things like "steady speed driving at practically off-boost will heat up everything", but some spirited driving (lots of overtakes on a curvy road) might lead to such a condition, I guess. Anyways, just a thought.
@@SpiritLwerewolf There are many variables. 650c is quite common inside the exhaust gases of a turbocharged car under load. The larger the turbine and exhaust system (thermal mass) the longer it will take to cool down. Turbo timers are used on trucks and vehicles that run at high loads. If you were to run a turbo at high load and it only had oil cooling and you turned off the engine straight after high temperature, the turbine housing will transfer a lot of heat into the oil and will coke it. Most of a turbos wear is during startup like the rest of the engine. The shaft spins up on a dry bearing.
Good explanation & pictoral :) Presumably for petrol? Diesel another kinda scene? A bit?
Whatever... Engine designers/ Lube manufacturers, are supposed to Know all this? In The First Place?
The User, Just follow Manufacturer's Manual? Re: Oil spec/ Svc Interval/ Cool down time, after hard run?
Yeah I think the main problem is just that a single oil is trying to manage two entirely different systems. On large industrial engines the turbo usually has its own dedicated oil system.
@@LubricationExplained if you put a separate oil sump and pump for the turbo wold be better? and what tipe of oil will be the best for only the turbo
Thanks , this was informative. Do you recommend a regular Engine Oil Flushing as a preventative measure?
How long should i idle before shutdown?
Hi Rafe, can you do a video on oil analysis alarm limit's
That’s a good idea. Will add it to the list.
I use Mos2 luqimoly additive
Use quality 100%/Fully Syn oil and replace em religiously (shorter interval)
Can I ask u question
My car use gasoline direct injection and turbocharger.
I live in the city where the avg speed is around 16kph (9mph) on peak hours.
Even though everything is standard, my car consume 1/2 liter oil per 1,000km.
Following official dealer's mechanic, the oil is 5w30.
With the traffic, south east asia hot-humid weather, and very hot engine, can I use 5w40 with same spec (sn plus)?
Same with my audi problem, but running a thicker oil will hurt the mpg a little and you will feel the engine a bit sluggish, been tried various oil brands to counter this including "ester base" engine oil but none works
@@AB-dm9yz how much you upgrade the SAE?
Planning only up by 10 only, 1 of my friend up by 20, running well. Idk about the fuel consumption though.
@@durgimstingetium
My audi reccomnds 5w-40, i tried the ultra with GTL, total, etc and even mobil 5w-50 with almost simillar result, so I accept that it is the engine design that burns oil,
Funny thing is recently I put ester base 5w-30 on several oci oil pressure is fine and the engine rev happily
Using a 5W-30 oil that is designed for your vehicle should be ideal, even in hot temperatures, since a 5W-30 appears well suited in modern engines. However, using a 5W-40 oil instead will increase the temperature of the 5W-40 oil, since the oil flow through your engine will slow, causing the oil to spend more time in the hotter parts of the engine. Ideally, you would want to use a 100% synthetic oil, which generally has a higher thermal-breakdown threshold than a full synthetic oil.
@@jimn.9990 sold the car already though, change to other.
Now I'm avoiding car with direct injection, turbo and CVT.
I just have more confidence on old tech car, abuse tolerance is just up there.
Hlw.. Im thinking to manufacture all type lubricant oils
Don`t think. Do!)
We need ferinheight
Can you do the same video in Fahrenheit?
Nobody on this planet except for a handful of people uses this unit. Learn the proper units.