Gergely
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| posted on 28/2/08 at 09:54 AM |
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Exhaust end-can question for the BEC guys
Hi,
Just wondering here. For a BEC you need to have a specially made manifold and exhaust system, all right. But how about the end-can? Is it possible to
use the bike's original can? What would be the advantages and disadvantages when compared to a can made specifically for the BEC by the kit
manufacturer? Would there be a difference in power / noise?
Thanks,
Gergely
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mistergrumpy
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| posted on 28/2/08 at 10:18 AM |
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Summat I've asked in the past this. You can use a normal bike can like my R1 courtesy of AndyW (cheers) but it may need modding to include the
rolled edge and possibly a 90 degree bend on the end to direct the exhaust fumes away from the rear wing and stop them coming at your passenger. I
don't think that that there's a specific can made for BECs by a kit manufacturer it'll be the same one for CEC's. To confuse
things more depending on the rear can used, dependes on the noise you'll get and the reduction in power and emissions. I know my standard ZX9
can quietens the exhaust down but sounds great when you rev the engine whereas the R1 can quietens it further and sort of dulls the top end noise a
bit. I suspect the R1 is better for the emissions though. Its all a bit hit and miss see.
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MikeCapon
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| posted on 28/2/08 at 10:49 AM |
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Stock bike cans generally offer the best noise/performance package. Even some aftermarket "performance" cans just up the noise and lose
all the mid range without any top end gain. There are a few exceptions such as the 1200 Suzuki Bandit where the bike is restricted by the can.
In terms of modern sports bikes however it is rare that a can will make much more power. Full race systems from reputable manufacturers will give more
power but also more £/db. Beware of the feeling that a noisy can gives. When the mid range is shot to bits the kick you get when you arrive at the top
end coupled with the noise make it feel faster. Looking at the stopwatch you've lost a second! Even on race systems you need to repack the can
regularly to keep the bike driveable.
[Edited on 28/2/08 by MikeCapon]
www.shock-factory.co.uk
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ChrisGamlin
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| posted on 28/2/08 at 10:24 PM |
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When looking at bike cans, its important to be aware that the decibel ratings that bike cans meet are not recorded in the same way as the noise levels
you'll need to pass at SVA or trackdays. Bike can decibel ratings are (I believe) rated as a driveby reading at certain revs, as opposed to a
static reading from much closer to the outlet pipe. Therefore some aftermarket bike cans that seem to offer a really low dB rating may actually be too
loud for trackdays or passing SVA.
FWIW I had a stock R1 can on my 5PW R1 BEC and it was OK but fairly quickly degraded internally. Ive changed it to a much larger repackable can and
its dropped the noise by about 4-5dB and I had to up the mid range on the Powercommander map a little as it was running weaker due to slightly better
breathing. The stock R1 can is still a good budge choice though IMHO.
Chris
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Gergely
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| posted on 29/2/08 at 08:26 AM |
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Thanks for the replys guys.
One more question then: I plan to use a 2005-2006-2007 R1 engine (undecided yet, will see the budget and the suggestions of people too).
Can I use a, say 2001-2003 R1 can with the newer engine or are these cans very specifically tuned to the corresponding engines?
Thanks!
Gergely
[Edited on 29/2/08 by Gergely]
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mistergrumpy
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| posted on 29/2/08 at 10:25 AM |
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The cans probably are suited to the engine - or the engine suited to the can - but regardless because of the different set up i.e. the lengths of your
manifold and type/size of air filter you would alter this "ideal set up" anyway so really as before its a bit of trial and error and
working around the problem.
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MikeCapon
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| posted on 29/2/08 at 11:14 AM |
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The early R1 can will probably work OK on the later motor. As has already been pointed out above, a can is just part of the exhaust system which is
'tuned' to the motor. The ideal setup would be to retain the stock measurements for the collector and to keep the Exup valve and the stock
can. As I doubt this is the case then the choice of can becomes less important.
www.shock-factory.co.uk
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Gergely
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| posted on 29/2/08 at 01:16 PM |
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OK, thanks guys! I will try to find a cheap can then...
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