I'm about ready to start my newly installed engine but before I do the exhaust system needs to be installed. I'm starting with only the exhaust manifolds so I need it all. There is a very good exhaust shop nearby owned by a fellow that does everything from a stock system to high end custom work. He's willing to do mine but I'm unsure what mufflers should be used. I was also wondering if anyone has had the pipes merge into one creating one tail pipe? I not sure how much back pressure this would create Any thoughts would be appreciated.

 

I would think there is an advantage to keeping the pipes as a true dual system. You'll have better exhaust scavanging that way, rather then merging both flows. I don't know the exact specification of the original mufflers, but I suspect it wasn't anything too fancy.

The S Type has quite a different ( and more complex) exhaust, no doubt because it was a more expensive car when new and they wanted to emphasize luxury and quietness more. It has a resonator both after the downpipes that both banks pass through, then carries on to mufflers before the axle, over the axle and resonators than a tailpipe.

 

See: Especially post No 17 ~ As JB says keep it dual all the way. The correct approach.

https://www.jaguarforums.com/forum/m...talled-261727/

 

if the car is an S type (1963-1968), the below photo is the exhaust system I installed in my car. All stainless steel made by Bell Exhausts UK. Same system as fitted by the factory. It came with "U" clamps which I did not use, I used Band clamps and Exhaust Adhesive. No welding, Jaguar never welded exhaust parts.

 

These engines like to breath. S Type.

 

The MK2 exhaust system is much simpler than the S type.
Refer to Glyn's attachment with a picture of a MK1 exhaust system
The main difference is that after the rear axle the pipe system is bent towards the left hand side of the car.
Approximately 4 or 5 inches to the left of the left rear over rider there should be a relieved part on the bottom of the body. It is about 5 inches long and maybe an inch or so deep.
That is where the pipes should exit.
By the way and VIP the exhaust pipes run under the rear axle

 

Yes. I found that interesting. The S Type exhaust runs over the top of the IRS in more conventional style whereas the others run under the rear axle.


Mk2

 

I'd certainly favour stainless over mild steel, as much for avoiding all the rust that falls on you when working under the car as for longevity. Staying with a well made Mk2 system makes fitting easier. If you want to increase performance, then it's easier to work from a stock pattern and change pipe diameters and silencers.

 

Great picture Glyn.Any reasonably capable exhaust shop should be able to fabricate a system based on that picture.
I suspect stainless systems can be a noisy problem if the wall thicknesses involved are too light. Not in the exhaust noise rather than noise transmitted from the pipe system
I have an all stainless system on an XJ series 3 and it a bit noisy in the car whereas the previous old steel system was fairly quiet
cheers

 

Does the S-type & 420 have these openings in the floor pan for the mufflers? Are they rust pockets? I assume they are boxed in (sealed)on the inside.

Thanks,
Bob

 

not in my S type or XJ-6, looks like the floor was sliced.

 

Yes, it's part of the rear seat suport on the other side. There is a heat shield between the muffler and the floor. I'm not aware of them being rust traps in particular, there isn't any place to catch water in particular. The heat shield is spaced out from the body to allow drainage and air flow.

 

Exactly right JB & they are not rust traps. One area I've never seen Chronic rust in an S Type. The heat shields stops any crud build up. If water splashes up there they drain easily. Nothing is trapped.

 

Bill ~ they have engineered that tinny rasp out of stainless steel exhaust systems today. I comment on it near the end of my thread on my car (see my signature). It's not only materials thickness. Just one change of spot weld position of the silencer guts will move it out of the critical frequency.

I responded to a question as to why I had fitted Stainless vs. Mild Steel ~ "Hi Richard. The sound & noise of the stainless exhaust is fine. Even a bit too quiet. The Bell system does not create that tinny rasp that some stainless systems achieve. One is more aware of the gentle whine of the intermediate gears in the sync 4 gearbox. Lots of Dynamat under the underfelt & carpets."

There is a hell of a lot of exhaust on an S type & on a low use car the mild steel systems rot out in no time.

"Out of interest I had originally bought a Falcon SS exhaust for the car that a friend of mine wanted knowing that my restoration was delayed by me being sent on expat assignment. So I let him take it and ordered the Bell later. The Falcon was very well made but it did give my friend's car that strange SS sound so I'm pleased I waited for the Bell. Time marches on and the SS manufacturers seem to have overcome the issue. All Benz cars today come standard with SS exhausts & sound just fine.

I don't think Falcon or Langford SS exhausts even exist any longer. They were big in the early days."

Cass has a Double S stainless steel system on his S Type & is equally satisfied.

 

When I was restoring my S Type the vendors I was buying most of my parts from recommended a Bell system, even though he sold a competitors product, He said when shipping an exhaust that far, I might as well have the best, so he obtained one for me and sent it with the rest of the order.

 

Thanks everyone for the answers about the floor pan!

 

Rear Heat Shields from UK car prior to restoration ~ mine got lost by my initial fired restorer. Bought these on Ebay UK.







Excuse the dust, we had been buffing. ~ Media blasted & Restored heat shield






Heat Shields installed.

 

Here is a clearer view because of the paint colour of the recesses in the floor above the rear silencers. From your photo it appears you are missing the heat shields that Glyn has posted pictures of and who ever fitted your exhaust has tried to push the silencers up into the recesses to give more ground clearance which is not required.


The silencers should sit fairly flat in relationship to the underside of the car. As Glyn stated this is a Double S system which I fitted due to the rear half already having been replaced prior to me buying the car with a double S rear section and the fact the factory is only 30 miles down the road from me so easy to collect.

 

There's a similar recess (dent) in the seat pan of the Mk2, though only on the exhaust (left) side of the car. There are similar heat shields as well. For rust, I don't see much difference between the exhaust side of the car and the other. If anything, the exhaust side of my car is the less bad. The serious rust traps at the rear are the exposed jacking points in the Mk2. They are relatively shielded in the S type. And don't get me started on the inverted top hat that forms spring hangers of the Mk2.

 

Cass ~ It all shows so much better on a light coloured car.

I don't know who you are addressing with "From your photo it appears you are missing the heat shields that Glyn has posted pictures of and who ever fitted your exhaust has tried to push the silencers up into the recesses to give more ground clearance which is not required." Jose maybe?

My exhausts are correctly mounted with all genuine mounting hardware.