411 (Series 3-5) Exhaust Tailpipes

[Nick Challacombe]

Kevin Howard wrote " The cheapest and quickest solution - has to be after
market
exhast tips that point downwards."

Just like the 407, the first use of a V8 in a Bristol.
Makes me think that the problem was always there and
an effective solution found. The 407 handbook advises
that the rear windows should be left open when driving
to facilitate the movement of air in the cockpit.

[John Keighley]

Many thanks to all who responded with these suggestions. On Monday I'll take the 410 to Cooma and the workshop with the only exhaust fabricating and pipe bending capability in town will blank off four metal tubes, weld these up, cut a hole in the bottom of each and then fit chrome caps over them to tidy up the job. As we have discovered, there are no exhaust tips of this type available Australia, so we will have to fabricate them. When all is complete I will post results and photos and let you know how we got on. Now armed with this information, I can throw some light for the workshop people on how the set-up should be. Many thanks for the photos, Kevin.
John Keighley

[UK6]

John,
It will be an exhaustive solution!

Brett

[Kevin H]

Originally Posted by John Keighley

.... On Monday I'll take the 410 to Cooma and the workshop with the only exhaust fabricating and pipe bending capability in town ....

Cooma ? - I bet they don't see many Bristols there :-)

[exgasman]

From memory the pipes on my 412 S1 pointed slightly up and had rectangular holes about four inches from the end on the underside and I'm quite sure they were not blanked off.
The mystery deepens!!

[Peter.Kent]

When I first had it the (non-standard) ss pipes were pointed upwards. No problems with fumes. But they seemed a small bore. The current ACCS items have the oblong slot at the bottom and blanking in the outlet.
PS: the rear window in the Imp was for loading luggage etc into the back. V practical it was too ...as was the car in other areas as well. And did it go if properly tuned. Peter

[lansdownplace]

My 412 had on odd aftermarket exhaust which branched off in a Y shape splitting from the Diff so the exhausts protruded at the right place but pointed outward at about a 30 degree angle and cleared the rear bumper a little. The previous owner had attached lip spoiler to the rear bumper to stop fumes coming into the back of the car when the hood was down as his passengers had apparently noticed this. He said the bumper spoiler did the trick.

When it was rebuilt BCL fitted new SS exhausts (which are very quiet) with their stainless steel tips. These are blanked off internally and have the slots cut underneath as described elsewhere in the thread. The 'spoiler' was removed. I have done at least three thousand miles with the roof down and passengers in the rear with no complaints or comment, so this must work. I sprayed the interior of the tips with matt black barbecue paint so that you don't notice the blanking discs.

I have put my winter top on and as the S2 doesn't have vent slots the back of its hard hat like the Beaufighter of the car is pretty airtight. This does mean that you don't get a good airflow through the cabin though unless you crack a window open slightly hence the modification when they did the Beaufighter. My Brigand had vent slots in the parcel shelf to the wings and I am pretty sure that there are also breather panels in the parcel shelf into the boot, although I am happy to stand corrected on that. The 412 definitely doesn't have this.

Paul

[browning l]

Just a sidenote to the tailpipe question - and everyone may know this already:

The four pipes on my '79 603 S2 are blanked off, and have holes on the bottom side, from which the exhaust issues. This is easily seen from both the vapor emissions, and the moist spot on the concrete garage floor under the pipes.