408 exhaust questions

[PEU186F]

David, Sorry, you're quite right, I started from the viewpoint of a 410, the 408s didn't have the front mounting, which were added, one presumes for good reason, on the 409s and then carried across to the 410s, and then, I understand, changed to a mounting via a frame on the gearbox on the 411s. Also, from my experience, for good reason.

For what it's worth I attach a not very good photo of the "A" frame mounting off the gearbox that has now been adopted on my 410.

My car also now has swept tubular exhaust manifolds courtesy of Spencer Lane-Jones. They are fantastic pieces of knitting which have considerably improved the cars breathing and appear to have reduced the under bonnet temperature, not, I imagine, that the latter is too much of a problem in Novia Scotia. They leave no space at all at the sides of the engine bay!

Roger

[dwomby]

Nice looking headers there, Roger. Maybe one day on mine.

I am interested in the addition of a 3rd mount at the front on cars later than mine. My two exhaust hangers are rigid and I thought that odd. I'd expect rubber in there somewhere. So I am intrigued by the mount you picture because it looks as though it holds the exhaust pipe rigidly in relation to the chassis. Am I seeing that correctly? or is the upper end of the frame on the transmission? Where is there any flex in your setup?

David

[PEU186F]

David

No, you’re not seeing that correctly, the “A” frame, not that the A is closed at the top, is mounted on the rear of the gearbox, not the chassis, so the exhaust system up to that point is still insulated from the chassis by the engine and gearbox mounts

The two rearmost mountings each side should certainly be mounted on rubber.

Tony Crook claimed that the use of mild steel exhaust pipes alongside stainless silencers made for a quieter exhaust system, but it perhaps as well to remember that he was extremely good at writing up his product

Good luck

Roger