Smoke
- Thread starter davidp
- Start date
What colour smoke David? It is quite common with all of the flat six engines as oil can seep passed the piston rings when it's just sitting there and this, of course, is burnt and expelled when you start the car. If you just get a puff on start up and then nothing after that I would say it's nothing to be bothered about. My gen 2 C2S used about 1L of oil every 1000 miles or thereabouts.
As Alan says not unheard of with flat format engines. Sometimes as the engine cools a partial vacuum is formed in one or more of the cylinders and this can suck in oil past the piston rings, resulting in a brief cloud of blue smoke on start-up. Not sure but I guess this phenomenon is not apparent on the dry-sump versions of these engines.
Oil consumption is also somewhat variable with figures varying from sub 1000miles/litre to a claimed 15000miles/litre, I average circa 6500miles/litre - Porsche consider 1000km/litre or better to be acceptable.
Oil consumption is also somewhat variable with figures varying from sub 1000miles/litre to a claimed 15000miles/litre, I average circa 6500miles/litre - Porsche consider 1000km/litre or better to be acceptable.
ORIGINAL: Alex L
Only does it to me when the neighbours are watching! I can feel all the disapproving eyes on me as I pull away []
The fix I believe is to leave the engine to idle for a couple of minutes before you switch it off after you get to your destination.
It does say this in the manual:
"Do not stop engine immediately after hard or
extended driving.
Keep engine running at increased idle for
about two minutes to prevent excessive heat
build-up before turning off engine."
Wills
New member
Well I never keep the engine running after I've arrived and its only used 1litre of oil in 13.5k. (if the electronic gauge is to be believed)
I always rev the engine to max on every journey I make, and did not run the engine in as some people do, I wonder if the daily use my car gets helps?
I always rev the engine to max on every journey I make, and did not run the engine in as some people do, I wonder if the daily use my car gets helps?
I would have thought that any engine being driven hard will have hotspots and that it's a good idea to let the temperatures drop and even out some before turning off. Certainly on track days, whether in a turbo or not, I always idle (the car!) for a couple of minutes after a session.
Peely
New member
Always remember being in the pits at Donnington at a British saloon car championship round back in the 90's when a new driver at his first session in one of the RS500 Cosworths came into the garage after a few hot laps and proceeded to turn the engine off !!!!
The mechanics faces where a picture, running over to the car shouting....................."Noooooo !!!!" []
The mechanics faces where a picture, running over to the car shouting....................."Noooooo !!!!" [
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I always think its best to drive a while keeping the revs low after a hard run to allow the oil to cool and the rest of the engine/gearbox, while still keeping the oil pressure up. Not a big fan of leaving a hot engine to idle.
Also good for the brakes, if you stop with really hot brakes, the part of the disk in the caliper cools down much more slowly that the rest leading to warping.
Also good for the brakes, if you stop with really hot brakes, the part of the disk in the caliper cools down much more slowly that the rest leading to warping.
Very good point Gary, I think the good book talks about "increased idle" - whatever that means! I take it to be around 1500rpm? Anyway, enough to keep the oil and water moving at a reasonable rate. As an aside I am very pleased (and surprised) to note that after 1500 miles mine would appear to have consumed no (measurable) amount of oil. Long may that last![]
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