Morris Minor Owners Club

Am thinking about making my own exhaust system to come out behind n/side door. (2 Door) Has anyone ever taken a straight through silencer in bits, or made one. It cant just be a case of getting a section of pipe same bore as system, drilling holes in it, wrapping fibreglass round it and fitting whole lot in a larger dia tube. End plates could be a problem. But is that the gist of it?

Just buy a silencer (straight through if you like) some straight pipe and some bends (or check out the skip at you local kwik fit etc for good material). You can then easily manufacture an exhaust to suit.
It's better to have welding equipment unless you use sleeves and clamps for attaching the sections. If you have a welder and don't have the bends, you can make them from straight pipe relatively easily.
Personally I wouldn't think about a side exit pipe - been there, done that - very annoying on a longer trip.

Pete

Agree with Peter on this, plus the exhaust is designed as a 'tuned 'length
and the silencers to give the required amount of back pressure.
Just look at the commercial minors exhaust which is about the same length as the saloon even though it could have exited on the n/s quite easily.
If you must go side exit and short pipe ,have a look at some cheap bike silencers.

I very much doubt the original Minor exhaust is in any way 'tuned'!!!!!!!!!! I had side exhaust on my rally minor - many moons ago now - it works, and at least the noise is on the passenger side - but it can be noisy. Straight through silencer is just exactly as you suggest Ian (but perforated tube rather than 'drill some holes') - but hardly worth making your own. I bought nos Cooper S straight through silencer (good size pipes) recently for £2 - so bargains are out there if you look!

Sorry BM, getting carried away, again, ... note to self, do not get carried away

Unless you have to do this I wouldn't bother.
The biggest headache I had with my 1275 van was cobbling together an acceptable exhaust system (you couldn't buy one then).
Mig welding isn't ideal and your gas welding has to be good enough not to leave any pin holes or they will whistle.
Having a loud exhaust is fun for a while but if you are going to do long journeys listening to the radio is much more relaxing and much less tiring.
I don't think Minor exhausts were tuned either but I bet modern cars are as it is quite difficult to find pipes of the same size or ones that will fit one inside another.

I've just stripped out the incredibly complicated stainless exhaust the last owner had fitted to our LCV - owing to the Marina engine fitted he had to start from two outlets at the manifold, and obviously didn't have a bender, as it's got many dozens of cuts/welds wherever it has to turn a corner. Don't think it had any baffles, it was very noisy (and it leaked a lot!) plus it banged on the underside of the car as you drove along. Now have a nice lifetime-guarantee one from Bull Motif, I wonder who's life?

I asume it's not connected to the twin outlet Marina manifold ? Or - do BM now do an exhaust for that manifold?

bmcecosse wrote:I asume it's not connected to the twin outlet Marina manifold ? Or - do BM now do an exhaust for that manifold?

ESM do a downpipe for the twin outlet Marina / Ital manifold -
http://morrisminorspares.co.uk/shop/ima ... /EX124.jpg

Paul Humphries

Either way, the Marina engine is in the garage and the van now has a 1098 engine

Helo Mark,

"your gas welding has to be good enough not to leave any pin holes"

That is one of the advantages that oxy\acetylene (and TIG to a certain extent) welding has over MIG in that it is very easy to see the weld pool and ensure that there are no holes.

Alec

Hi Alec
That is what I was trying to say.

How much does it cost to run an oxy acetylene welding set these days though?

Years ago when I had a set it seemed that British Oxygen were pricing hobbyist users out of the market with high bottle hire charges.

On a flat surface it is easy to see the weld pool but it does get trickier when you are welding round a pipe

Another thing to bear in mind if you are raiding Quik-fits bins is that many car makers coat exhausts with aluminium which needs to be removed before you weld.

Thanks for that twin exhaust pipe link Paul!

Oxy bottle hire is about £100 p,a,

Hello Mark,

certainly it is not cheap, but I think my rental is about £60 each per annum (Porta pack size). With welding mostly thin sections I find the gas goes a long way as a refill is also about £60.00 or so.

I just find it so handy for various workshop jobs, e.g this last week I have cut some 10mm plate to make some brackets for a self build project and welded some 1\2" hose tails onto 3\4" hose tails (brass) as I couldn't find an adapter locally.

Alec

Ian what size bore pipe are you wanting to use. PM me for info