Smoke Under Hard Acceleration

[WIL35]

Have noticed this before but on Tuesday I was easing away from a Porsche 996/997(?) on the long uphill straight from the roundabout on the A3. In my mirror I could see 'smoke' in the beam from his headlights, do you think this would be a bit of oil burning or perhaps the richness of the fuel mixture at the point of acceleration?

[caduceus]

Obviously it depends on how much smoke there was, or how dense it was.

If it was more of a mist than smoke, I recon it was a mixture of over fuel and a bit of oil.
But hard to tell without actually seeing it. All IMHO ofcourse

Cad

[RUSSELLM]

Mine originally started doing this under hard acceleration, but my oil consumption started going through the roof.

On hot motorway driving abroad, I would find a film of oil above one of the exhaust pipes.

It's in having a top end rebuild at the moment.

[kojak]

This may seem daft but are you sure it was smoke and not dried salt being blown about?

[rev-erend]

Check your oil consumption. Have a friend follow you have have them note the 'smoke' under normal driving and full acceleration..

If any smoke if seem - I'd get it checked out now as it will be cheaper in the long run !

[HarryW]

If a standard car with the cats missing then it is more than likely to be unburnt fuel.

However worth getting it checked out for anything serious whilst it's in one piece .

[WIL35]

Thanks all. Oil consumption is about a litre per 1,000 miles, that is using Mobil 0W/40. I will change viscosity at the next oil change to see if that affects the consumption. It has stayed pretty constant over the last 10,000 miles, it's nearly on 30k.

I'll get someone to follow and watch, am I right in thinking that if the smoke is blueish it's oil and if it black then it is fuel?

[rev-erend]

If it's black - could be the wheels are still spinning

[Scrooloose]

It could just be soot.

If i've been pootling around for a while getting pops and bangs, then nail it. All the deposit from the pops gets blown out of the exhaust in a nice cloud. It's then perfectly clean.

[caduceus]

HarryW said:

If a standard car with the cats missing then it is more than likely to be unburnt fuel.

He could always screw a spark plug into the back box, connected to a coil, and swap smoke/mist for flames.

Has anyone ever put one on a Cerb before? The effects must be rather dramatic.

[HarryW]

caduceus said:

HarryW said:

If a standard car with the cats missing then it is more than likely to be unburnt fuel.

He could always screw a spark plug into the back box, connected to a coil, and swap smoke/mist for flames.

Has anyone ever put one on a Cerb before? The effects must be rather dramatic.

Already got one of those, mine flames on the overrun nicely so I'm told

[xlr8-uk]

Do you see anything during daylight? Headlamps from a following (quickly dissapearing!) car will highlight anything from the rear of your car much more than normal. I have had these doubts myself in the past. Try it during the day, and note whether there is any smoke, and if so, what colour?

[rev-erend]

caduceus said:

HarryW said:

If a standard car with the cats missing then it is more than likely to be unburnt fuel.

He could always screw a spark plug into the back box, connected to a coil, and swap smoke/mist for flames.

Has anyone ever put one on a Cerb before? The effects must be rather dramatic.

Dean in Surrey has one too .. flames nicely on the overrun !