Why don't diesel exhaust point downward anymore?

[anonymous-user]

I've heard some bks on here over the years, but "exhaust deposits landing on my car and making it dirty" is a new one on me.

[Who me ?]

Conscript said:

We have a 2005 X-Trail. It doesn't have a DPF, yet the exhaust doesn't point downwards either.
Handy for generating smoke screens and giving aggressive tailgaiters lung cancer.

I had a company van a few years ago, which should have been /would have been failed on MOT .NO smoke at normal revs, but floor it at 50 ,and vehicle behind disappeared in cloud of smoke. Great for getting rid of tail gaiters.

[JordanTurbo]

daemon said:

Our Jag has worse than that - a styled exhaust tailpipe out the back whereas the actual exhaust points downwards further back under the bumper.

Diesel Freelander 2 can beat that.

Nice chrome straight tail pipe with a turned down one inside it!

[Tam_Mullen]

I was just away to post about the freelander!

[skyrover]

Downturned pipes look naff...

Unless they are 4 inches wide

[PorkInsider]

Midshipracer said:

Well i do hope they return to downward. New or old diesel, immediately they accelerate all the deposits land on my car, annoying if I've just washed it.

Absolute bks.

[Midshipracer]

PorkInsider said:

Midshipracer said:

Well i do hope they return to downward. New or old diesel, immediately they accelerate all the deposits land on my car, annoying if I've just washed it.

Absolute bks.

I meant accelerate hard. Normal driving of course they don't. Even worse if ( why would you) "tuned"

[Jimmy Recard]

The Rover SD1 still has the oddest exhaust design I can think of.



I was told that there was a reason for it, but I've forgotten the reason. Does anyone know?

[anonymous-user]

Midshipracer said:

I meant accelerate hard. Normal driving of course they don't. Even worse if ( why would you) "tuned"

I dunno, maybe to get a good chunk of extra power and torque for minimal investment? Just a thought.

Any DPF equipped diesel that is chucking soot out the back even under hard acceleration is completely fked.

[Mr Tidy]

I'm sure the change happened when diesels got DPF's.

My 320td exhaust pointed downwards and chucked loads of smoke out when you floored it.

But my 123d which had a DPF didn't point downwards and didn't smoke when I gave it loads - EU5 rather than EU4 IIRC (but as we now know it probably still poured out NOX and particulates)!

Given what we have finally realised maybe diesel exhausts should exit in the cabin!! If you want cheap tax you should pay the air quality price! (I have proper car engines now, powered by petrol - don't associate with fairies, so don't know any producing any dust!!)

[SamR380]

Jimmy Recard said:

The Rover SD1 still has the oddest exhaust design I can think of.


I was told that there was a reason for it, but I've forgotten the reason. Does anyone know?

During late development they found that exhaust fumes were being drawn back through the vents in the hatchback just above the number plate. Solution: stick a massive dogleg in the tail pipe.

[Max M4X WW]

Jimmy Recard said:

The Rover SD1 still has the oddest exhaust design I can think of.



I was told that there was a reason for it, but I've forgotten the reason. Does anyone know?

Similar to this?