411 (Series 3-5) Exhaust Tailpipes

[exgasman]

Just a point of interest I've recently spoken to the guy who had my 412 S1 before me and he was the person who removed the blanking discs in order to create a “venturi” effect through the bottom slots to improve the exhaust flow.
All I can say is that I very often ran with the back section of the soft top down but with the middle section of the roof in and never had the hint of fumes in the cabin.

[John Keighley]

Kevin,
That's bad luck. Hopefully, you can get the leaks sorted out and hopefully its not the main seal at the rear of the crank - it's a rope seal and if that's leaking, I am told that the crank has to come out.
All exhaust fumes in the cabin seem to be now eliminated. I've had a good opportunity to test is and there's nothing noticeable.
I do however, have to upgrade the seal along the back of the boot lid as the one that is there isn't providing an adequate seal. It is where the lid joins the lower part of the body- where the locking mechanism is located.
There is a story (a brief history thereof and a brief description of the refurbishment on this 410 published in the current BOCA Club Express magazine.
John K.

[John Keighley]

Finally,
I have been able to take some photos of the completed work to the exhaust tailpipes. Pictures 005 & 006 show the finished work. I have also added a picture to show the arrangement when the car first came back. Why I chose a 411 quadruple tailpipe arrangement is that it looks far less ungainly than the original system and significantly neatens up the appearance of the back end of the car. Although not frequent, I've been in it enough to confirm that there are no exhaust odours in the cabin now. The one thing I do need to attend to is the rear boot lid seal which isn't sealing the boot all that effectively and that will settle any other exhaust seepage issues.
John Keighley.