Bike exhaust

[voucht]

Hi,
I'm about to get, for free, a motorbike rear muffler for my Roadster. It is from a BMW K1300R. My best friend in France will give it to me, I just have to pay for the shipment.


PotBMW par Voucht71, sur Flickr

This rear muffler has an integrated catalyst (and I need one on my car to pass the emission test), which is pretty cool because I won't have to fit an ugly cat on the line (or the better looking but very expensive stainless steel conical cat).

The engine of this motorbike, when unleashed, is more powerful than my 115 hp 2.0i DOHC from the Sierra, so it should cope with it with no problem.


But by safety, before having it sent to me, I'd like to have your opinion. Do you see any reason why it could not work on my car?


Thanks a lot.

[MikeB]

Seem to remember when I looked, standard bike cans were quite restrictive, but other than that should work.

[voucht]

Thank you for the comment Mike.

Yes, it has been my concern too, but I'm quite confident with this can as
- it has a 75mm diameter inlet (much larger than my main line)
- I checked the performance graphs of after market sports cans (like Devil, etc.) for the same bike, and the gain of performance is peanuts if you compare to the original can. So I guess the original can is not too bad.

But of course, I can't be sure before trying it on the road

Thanks for the input.

[Johno]

I spent a while looking around the Locost forum before I chose my R1 can.
The general consensus was if the BHP of the bike was more than the engine you are fitting in your car it should be fine.
Well I hope that's true as it's fitted now...
She certainly looks a beastie of a can, can't see why it wouldn't be ok..

[voucht]

Originally Posted by Johno

I spent a while looking around the Locost forum before I chose my R1 can.
The general consensus was if the BHP of the bike was more than the engine you are fitting in your car it should be fine.
Well I hope that's true as it's fitted now...
She certainly looks a beastie of a can, can't see why it wouldn't be ok..

Thank you for the input Johno.

I think I know what you mean by "beastie"... yes, I was concerned by the look of it too... not very "sevenesque"... I know...

Well, assuming that my Roadster will not have a "retro look", why not? We'll see how it looks when it is fitted!

It should be with me hopefully any time next week.

Thanks!

[voucht]

I received the rear muffler from the BMW K1300R on Saturday.


2013-10-26_11-16-37 par Voucht71, sur Flickr

Now I have to find a way to fit it. Originally, there is one fitting point on a clamp, and, on the bike, it is "hanging" from this upper mounting point.


2013-10-26_11-17-18 par Voucht71, sur Flickr
(on this picture, I'm holding the muffler by its original upper mounting point)

On the Roadster, as my exhaust line is on the left side, I need to turn it up side down. And the muffler not being symmetrical on the longitudinal axis (its left shape is not the same as its right shape) I just can't turn the clamp around (unless I completely straighten it flat, and shape it again perfectly to get it flush with every face/edge of the muffler section's shape). So if I turn the muffler up side down, and keep the clap as it is, the mounting point will be is under the muffler.


2013-10-26_11-17-34 par Voucht71, sur Flickr
(on this picture, the mounting point is in my fingers)

How do you guys think I should mount it? I will of course use a rubber mount, but is a lower point OK ? It feels weird as the piece is almost 7 kg (integrated cat.).

Any idea, opinion, tip..; is very welcome

Thanks a lot.

[K4KEV]

Hi Syl....I think I would be tempted to cut a wedge out of the inlet and bend it to accept a straight pipe from your exhaust but also put some kind of deflector at the very end to keep your rear arch clean, of course being stainless you will need tig or silver solder.

[voucht]

Thanks for that Kev. Yep, good tip about the deflector at the rear, I'll do that at the end, thanks.

When in comes to the inlet, I think I will remove the small elbow, and have the tube from the exhaust directly welded on it. I just have to figure out the different angles and have the stainless steel tube bent/weld by someone who has the facility to weld stainless steel (I don't and I won't).

So, the muffler will be mounted on a rubber mount from underneath (I'll use a small 90° bracket on the original clamp mounting point, the horizontal part of the bracket will seat on the top of a rubber mount, which will be bolted on a tab welded under the chassis). But do I need another "soft" point between my manifold and the muffler, or can the line be solid all the way? Does the pipe from the manifold to the muffler need to be supported too, or 1 mounting point on the muffler is enough?

Thanks.

[K4KEV]

I would certainly go for two mounting places.....the other one I would put where ever it is the most convenient/easy to do.

[jason 82]

Do the cars pass the emissions with the cat built in on the motorbike exhaust then ? I have a 1996 mx5 donor, so my car would require a cat, but the systems suitable on a. 7 is basically a straight through, so I just wasn't sure if a bike can is used, how iva & mot friendly the bike cans are ? I know that they will definitely be louder, but will they fail the tests ?