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fitting a cat inside a can?
cd.thomson - 24/7/10 at 09:06 PM

Me again..

can anyone hazard a guess at the feasibility of installing a cat inside my mahoosive can? I don't really have any understanding of the internals of a silencer.


rusty nuts - 24/7/10 at 09:07 PM

Why not??


franky - 24/7/10 at 09:08 PM

I know of quite a few where the cat is fitted inside a can, not sure on yours though as its got the 4 pipes going into it, do you have any idea of its internal construction?


GMPMotorsport - 24/7/10 at 09:09 PM

Think the RSPCA might object


SeaBass - 24/7/10 at 09:12 PM

Sorry - don't get it....

You don't want to pay for proof of engine age but you want to spend more cash on installing a cat into an existing silencer...

[Edited on 24/7/10 by SeaBass]


cd.thomson - 24/7/10 at 09:18 PM

quote:
Originally posted by SeaBass
Sorry - don't get it....

You don't want to pay for proof of engine age but no you want to spend more cash on installing a cat into an existing silencer...

Or is the engine not old enough now and you know it?


overly cynical much? If you read the last thread all the way through you'll see I can't get a precise date from vauxhall. My only options are an engine swap or an exhaust change/mod. The engine is definitely old enough I just can't prove it.

I'm glad of some positive responses! The four primaries enter the can and are "collected" into a single pipe in that first 6 inch section before the band you can make out on the exhaust - then from there its just a standard can.


SeaBass - 24/7/10 at 09:21 PM

Cynical - Smile first thing in the morning. Get it over with!

Thanks for clearing it up...


franky - 24/7/10 at 09:21 PM

what about ringing dax and borrowing a system? a lot of kit makers do it?


cd.thomson - 24/7/10 at 09:25 PM

quote:
Originally posted by franky
what about ringing dax and borrowing a system? a lot of kit makers do it?


I have spoken to dax and that wasn't suggested. I'm under the impression they only make them to order.



Now I know I'm not being retarded with the cat in can suggestion I'll see if my exhaust bloke will do the work for not too much money.


franky - 24/7/10 at 09:29 PM

its the material that may be expensive.... Feel for you with the hassle. Got me worried about mine now as mine is a 93 engine(with v5 etc) but had a cat fitted when new....


cd.thomson - 24/7/10 at 09:34 PM

quote:
Originally posted by franky
its the material that may be expensive.... Feel for you with the hassle. Got me worried about mine now as mine is a 93 engine(with v5 etc) but had a cat fitted when new....


you'll be fine bud, the emissions flowcharts dont take in to account whether it was fitted with a cat originally, only engine age.


mark chandler - 24/7/10 at 09:42 PM

Lots of cars collect and dump the exhaust straight into the cat, cannot see any real issues except that you lovely can may get spoilt.

Bikes have cats in the first part of the can these days when fitted.

You would I guess have to source a cat that would slip tightly inside, then make a collector inside to gather the primaries together... I do not know how advisable it is to skin a cat and just use the entrails!!!



Regards Mark


Volvorsport - 24/7/10 at 10:15 PM

its a shame im off site for 5 weeks , i could have made the whole thing for you .

youll need to support the cat inside the can with a ring/packer of some sort and weld it in , thats it basically .


GreigM - 24/7/10 at 11:33 PM

I'd imagine that internally your 4 pipes combine into one single 2 inch straight through perforated pipe, which is surrounded by packing. Fitting a cat would be a fairly simple job of getting a correctly sized cat, opening up the can, removing a piece of the inner tube (normally the initial bit just after the 4 pipes have merged), and welding the cat in its place then repacking the can.

I'd imagine the cat would cost around £100 then labour for the job - say 3 hours - so if you got the job done under £200 you'd probably be doing well.

[Edited on 24/7/10 by GreigM]


BobM - 25/7/10 at 07:20 AM

It will work fine but don't forget that the cat is not far off a foot long and will replace that much of your perforated tube so you'll lose a significant proportion of your silencing.

The cat also runs very hot and will melt your exhaust wadding.


RazMan - 25/7/10 at 10:03 AM

A little bit of WD40 helps



Well somebody had to do it