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You don't actually expect aftermarket people to make a product out of metric pipe so it actually fits, so you?
Only Hans and I do that kind of absurd stuff...
The OD of the cat pipes is 55mm (2.17", basically.)
The OD of the muffler pipe, where it is expanded to slide over the cat is 59mm (2.32", basically.)
The fitting of the X pipe is really a mess! I have metric conical tube in my Workshop to solve this problem but I can't weld tig.
My steelbuilder in the neighbour village will solve this problem.
As I am aware it is nominally a 2 1/4 inch exhaust size but exactly what that dimension is supposed to be I am not sure but suspect it would logically be the internal diameter given gas flow is a critical parameter.
That would show reasonable alignment with the 59mm dimension GB mentioned.
Presumably even ze Germans have to resort to Imperial units occasionally because that is the way the auto industry works.
The clamp with glasfiber is a Desaster! My 928 Shop here in Germany has everytime grey hair if a customer has aftermarket Performance parts from some Shops in the US .
Ya..and..well..l'm going to have to figure this out on my own..I cant hammer the reducer any shorter, and the supplier and manufacturer are just about it.
It's not getting through that a 2.5" fitting doesn't seal a smaller pipe. And, now I know how small it is.
I'm being asked to take it apart again, and attempt re-fitment, take a photo of it rattling around. But I can do math.
Been using a few methods and different exhaust sleeves to try to make this work. But no go..I decided today was the _last_ time I was going to put hands on this one way or another.
I "fixed" it...here's the special parts required if you get this 'kit".
The step down sleeve is not a small enough step down, and you cant get one that steps down enough, so 3 layers of soda can does the trick, four would be really snug, but can become a PITA to slide the cat over.. The length of a sliced section of soda can..is..perfect, I didn't have to trim anything off.
Wrap it around, hold it snug with some elec tape, and stagger the gap on the other layers..because why not. And _hammer away_ with the wheel nut cordless driver for all its got. Then it's finally "tight" enough to...begin to be acceptable.
If I had to go in again, I would slot the cat end, and get a 199x40mm length of exhaust tubing, which is .065, and the three rounds of soda can metal adds .0612..so a round of tubing thats a few mm short of the full circumference to be able to be compressed...would be perfect. But not everyone has a bench, some 2.5" exhaust pipe laying around, a grinder...they just want it to work.
Dear Supplier..you're a good guy, make this kit just...work. Slot one end of the cat so it can compress under the sleeves you provide, a 2" section of 2.5" exhaust pipe that is sliced to become a strip, cut down to 199mm in length..then grind off a few very short mm of that length...and this fits and would allow for compression.
A layer of wrap cant hurt either once the 'spacer' is on too.
And finally the end fix..the soda cans for this kit box of parts were temporary...and the layers started to unwind and come out on a drive to Vegas.
The end was a 3" length of exhaust pipe, 2.5" OD, with a 3/16ths slot cut into it, so that when the sleeve is tightened over it, it shrinks tight and seals.
We also took all of maybe two minutes to put some slots in the cat end, so it would shrink down as well under the sleeve.
The total added cost to this $1000 solution, about a dollar in pipe, and whatever 2 minutes on a bandsaw, or 5 with a hacksaw would cost to add 4 slots on the cat end.
You don't actually expect aftermarket people to make a product out of metric pipe so it actually fits, so you?
Only Hans and I do that kind of absurd stuff...
The OD of the cat pipes is 55mm (2.17", basically.)
The OD of the muffler pipe, where it is expanded to slide over the cat is 59mm (2.32", basically.)
Revisiting this mess...wanted to thank Greg for the Amazon link I needed today..
Notice the "leak the least" comment.
When someone starts with the wrong parts to make something aftermarket, the end product never seem to work well.
Go figure.
Notice the "leak the least" comment.
When someone starts with the wrong parts to make something aftermarket, the end product never seem to work well.
Go figure.
Ya..75mm to 3" to 60mm via the wonders of O'Reilly auto parts and soda cans, isn't a long term solution.
I'm going to have to tackle this project..and I hate welding exhaust, I don't have a big table and room to really work with pipe well...or shielding gas.
08-27-2021, 04:39 PM
S4 exhaust pipe size..
about it.
