Hard acceleration from cold

[Deendog]

Evening all
My morning commute consists of approx 1m gentle downhill trundle before joining a fast moving nsl a road. There is no slip road so I basically have to hammer it to get up to a safe speed quickly.
Often wonder whether it does the car any harm? (Dico 4 and 335d x)
Don't suppose there is much I can do about it either way but interested to know!
Cheers

[PorkFan]

It's not ideal but I'm sure it will not cause any negative effects. I'm sure there are a lot of cars out there treated a lot harsher from cold that are still fine.....the fact you even answered the question shows you have a degree of mechanical sympathy. I think a good rule of thumb is no more than half throttle or no more than half way round the rev counter until warm

[otolith]

I used to have to enter a dual carriageway from a short sliproad near home back when I had a new Civic Type-R. Always made me wince.

[BoRED S2upid]

You have to accelerate a 335d hard to get up to 60mph? Surely you don't have to exceed 2000rpm in 3rd gear.

[Deendog]

Doesn't feel great does it? Suspect my wife doesn't give it a second thought as she boots it,

[Boosted LS1]

The manufacturer will already have designed your engine to be mechanically safe when doing this. That said, you will probably get piston blowby and contaminate your oil a lot quicker. You may increase the wear rate to.

Edited by Boosted LS1 on Thursday 19th January 18:48

[otolith]

BoRED S2upid said:

You have to accelerate a 335d hard to get up to 60mph? Surely you don't have to exceed 2000rpm in 3rd gear.

It's more usual to worry about high revs on a cold engine, but I've seen car manuals which instruct that full throttle shouldn't be used either.

[Deendog]

Fair point re the bmw, it's the landrover that that needs to be flogged a bit

[Zad]

So long as the oil is not stone cold (and not gloopy from carbon deposits) then it should be fine. Even a minute should be enough. Just so long as the turbo, camshaft, crank/pistons have enough to do their job. As mentioned above, it is high revs rather than high power that will be a problem, and you are only accelerating to road speed, its not as if you are hammering it to 120 and then sitting at 80% max revs, the rev peaks should be fairly short.

[Farlig]

It´s also load on the bearings when the oil´s not up to temp... So big welly & low rpm are not good either but as mentioned above, if your oil´s good, especially these days with good synthetic multigrades, probably not too bad either

[Benrad]

I'd be more worried about the opposite, parking the car up and stopping the engine when it's just been at high load on that fast road is a recipe for turbo bearing failure. My advice would be to idle the engine for around 2-3 minutes before you stop the engine.

As others have said, the oil will have found it's way around within 10 seconds or so. Manufactures use very thin oil now to improve fuel economy so there's less chance of damage from cold running. High engine speed is the most concern, cold oil will give higher oil pressure so you'll be more likely to blow a seal or leak faster from an existing leak, but I wouldn't be too worried, there's a pressure release valve for a reason.

To back up my turbo bearing comment, I ran an investigation into turbo life when introducing stop start tech to a family of diesel engines, hot shutdowns can seriously shorten a turbo life