411 (Series 3-5) Exhaust Tailpipes

[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.

[John Keighley]

Many thanks to all those on this forum who were able to help resolve this problem. Armed with the information given, the people in the workshop facility in Cooma were able to fabricate suitable tailpipes from four 2 ½ inch tubes. These were bent up to about 5-6°, the ends were blanked off about two inches in and holes cut into the underneath. The chrome tips we initially had installed were then relocated to the ends of the new pipes. A couple of photographs illustrate the modification.
The end results look quite respectable but I haven’t been able to really test the new arrangement to see if it works because it was raining on the trip home. Kevin, it’s funny that you should say that about Bristols rarely being seen in Cooma. There were more visitors to the service facility than usual on that day, apparently the 410’s presence caused a bit of interest.
It’s interesting to note that the solution to the issue of these cars creating areas of low pressure around the rear can be quite complex.
This exercise also illustrates how valuable a forum such as this can be to operators of these cars – thanks Kevin!
John Keighley

[Kevin H]

I'm glad you found this site useful John. Looks like the guys in Cooma did a good job. Let us know if it solves your problem with exhaust gases getting into the cabin.

Regards,
Kevin

PS. I have a "roadworthy" test appointment on Monday morning for the 411 and an appointment with Vic Roads to get it re-registered on 22 Dec (this year!), finger crossed it passes the roadworthy!

[John Keighley]

Kevin, Good luck with the roadworthy. I thought that almost three years for me was a test of patience to get a Bristol back again but for you, that time would pale into insignificance! I gather you've abandoned the idea of fuel injection for the time being. Are you running it on the original induction setup?
John Keighley.