Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[V8Cowboy]

Hi,

I think my pre cats are finally done completely, they are blowing through the inner shell (actually at the 6 "welding points" you can see under the outer shell). Tried to weld them couple of times, then "glue" it over with exhaust paste and welded cover panel, but the whole part is simply rotten! As it is not really needed for taxation or anything else here - I'm thinking about replacing them by simple pipes. Lambdas have been moved already some years ago.

I hope to find someone who maybe has already done this, expecially if someone has advice on a suitable pipe? It's hard to tell, but a 90° pipe in proper diameter should be fittable I guess? I'd like to get everything together before starting instead of standing there with half-dismantled car.
And do I have to worry about the nut and bolt of the manifold? I hope not to tear it off as that would be probably the death sentence for my Omega. Any preparatory work suggested to avoid this?

Appreciate any input! Thanks in advance.

Kristof

[Nick W]

It would be much quicker and easier to replace them with 3.0l downpipes(that don't have the pre-cats) and weld in some bungs for your extra O2 sensors.

That would make a simple bolt together job, with the welding done on the bench.

Your decision is whether you take a chance on new ones that are readily available but might not last, or 14 year old used ones that may not be any good.

[V8Cowboy]

Buying even used ones is about 200€+ (at least here), not really economic for a car that probably will run another 1 or 2 years at most. Too many things to do, paint faded, kids on the way etc. So sooner or later I will need another car anyway, but still I would like to keep it in at least technically reliable shape.
I got one 90° pipe I think 55mm... in the worst case I would spend 30€ for another one and an afternoon welding. Fine for next MOT.
Question is... does this 90° fit more or less to replace the pre cat?