Different kind of Zorst

[damoace]

All the seriously powerful Boxer engines that I have seen have not used any sort of balance pipe, but have joined the two main pipes a lot further forward than BMW do. One of the main reasons that BMW do not join the pipes at what appears to be optimum place is for ease of servicing (you can't change the oil filter without removing the exhaust) as well as ground clearance issues. That gives you V shaped front pipes or indeed the Y shaped ones used to get the pipes into a decent bellypan like the HP2 Sport.
sandbar

Hmm. Interesting. Perhaps better to use an old R1100 gs/rt mainfold as a starting point? :

http://www.boxer-parts.eu/szczegolyProduktu.php?kat=0&item=1917&lan=4&cur=2

Food for thought for me at least.

I'll return your thread Nick, with my apologies for hijacking it.

@MikeB: You cant notice an extra 5HP in a bike with 95 already? Pity.

[nab 301]

. I mean, after all, that 'right-angle' crosspipe must be doing more harm than good with regard to exhaust gas removal. Or, did somebody already try it?l:

Gus (and Winger i think) went that route .. although as he says "only" 97 bhp but engine spins up very quickly.

http://www.boxertrix.com/phpBB2/viewtop ... sc&start=0

[el-nicko]

. I mean, after all, that 'right-angle' crosspipe must be doing more harm than good with regard to exhaust gas removal. Or, did somebody already try it?l:

Gus (and Winger i think) went that route .. although as he says "only" 97 bhp but engine spins up very quickly.

http://www.boxertrix.com/phpBB2/viewtop ... sc&start=0

Ah yes, I can see Gus' solution (joining the two pipe together well 'downstream' ) is a lot more elegant than my original sketch. Never mind; there's been some realy interesting contributions to this thread.

[Mike B]

damoace, I dont use the 90 or whatever BHP it has, so I would never notice an extra 5 at the top end.

[Daveg2812]

I'm with Mike, I'm not sure I'd notice a jump from a genuine 90 to a genuine 95, and if I did, how long would I notice it for, though I can see how for track use, it might be useful. The 1100r exhaust on the performance website gives no indication of how it achieves the quite substantial increase in power, and all this on an engine which is about 10hp down on the 1100s engine out of the crate. The separate headers follow the original design and do not appear to be being singled out for the increase in power.

[Mike B]

I didn't write this, I found it on the internet

The German Motorrad magazine performed an interesting test on mufflers in 04/2002 (source: www.s-boxer.de -German language -). They tested 8 different after-market (tuning) mufflers for the R1100S. Even though those manufacturers make a living with their products and many promised an increased performance, the test results were crushing. 7 out of 8 expensive tuning mufflers actually decreased the performance. Only one System (AC Schnitzer Grand Prix) had a similar performance than the original BMW muffler. By the way: The tested series R1100S had 101 bhp and 100 Nm torque with the original BMW exhaust system.
This result leads me to the conclusion; “It will be difficult to reach the performance of the original BMW exhaust system”. On the other hand, the Staintune system “without the primary pod- (this system was installed on my BMW) still reached 99 bhp and 96 Nm. None of the tested systems resulted in a significant loss of power. I guess those systems are just not worth the money.

[tanneman]

What happened to the post from Mike B and me last night? Did it get lost cause there was some problems with the server?

[sandbar]

The German Motorrad magazine performed an interesting test on mufflers in 04/2002 (source: www.s-boxer.de -German language -). They tested 8 different after-market (tuning) mufflers for the R1100S. Even though those manufacturers make a living with their products and many promised an increased performance, the test results were crushing. 7 out of 8 expensive tuning mufflers actually decreased the performance. Only one System (AC Schnitzer Grand Prix) had a similar performance than the original BMW muffler. By the way: The tested series R1100S had 101 bhp and 100 Nm torque with the original BMW exhaust system.
This result leads me to the conclusion; “It will be difficult to reach the performance of the original BMW exhaust system”. On the other hand, the Staintune system “without the primary pod- (this system was installed on my BMW) still reached 99 bhp and 96 Nm. None of the tested systems resulted in a significant loss of power. I guess those systems are just not worth the money.

This reminds me of the time that we were working with HPE to develope a silencer for the K1200. When doing the dyno testing, HPE could not get a standard bike to behave as badly as most other exhaust manufacturers were claiming was the performance of their "standard" bike.

sandbar

[Blackal]

I didn't write this, I found it on the internet

The German Motorrad magazine performed an interesting test on mufflers in 04/2002 (source: www.s-boxer.de -German language -). They tested 8 different after-market (tuning) mufflers for the R1100S. Even though those manufacturers make a living with their products and many promised an increased performance, the test results were crushing. 7 out of 8 expensive tuning mufflers actually decreased the performance. Only one System (AC Schnitzer Grand Prix) had a similar performance than the original BMW muffler. By the way: The tested series R1100S had 101 bhp and 100 Nm torque with the original BMW exhaust system.
This result leads me to the conclusion; “It will be difficult to reach the performance of the original BMW exhaust system”. On the other hand, the Staintune system “without the primary pod- (this system was installed on my BMW) still reached 99 bhp and 96 Nm. None of the tested systems resulted in a significant loss of power. I guess those systems are just not worth the money.

I have to say, that when fitting my Staintune - there was a noticable benefit in the engine's speed of response, which would indicate an increase in midrange torque. The free-breathing should also assist high-rev power.

I don't think it is disillusionment or false claims by all the people who have ditched their cats either.

That said - The ability of an engine to breath easier isn't the whole story. The ability to burn more fuel, efficiently - requires that more fuel is available to "feed the fire".

I don't see Honda running stock exhausts on John McGuiness's Fireblades either

Al

(not ready to sell my Staintune........ yet )

[el-nicko]

Al
(not ready to sell my Staintune........ yet. . Oh well, better start saving then

[slparry]

those look remarkably similar to the Remus fitted to my BCR

[Boxermed69]

God, they're gorgeous

God, they're pricey

[Blackal]

£1617 !

I hadn't realised they cost that much new, now

They've always gone (secondhand) for around £450 on here (They don't seem to make it as far as Ebay).

That seems a bit cheap, now

Al

[dave the german]

All I remember one that had never been fitted and they where only asking £400 for it!!!!