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View Full Version : SXV 550 - Silencer / Can



Yardey
10-26-2007, 04:20 AM
Hi all,
I am looking to purchase a decent silencer / can for our (www.cardiffracing.co.uk) SXV 550 engine.
Part of the scrutineering at our Formula Student / FSAE event, is to not exceed 110dB @ 8500rpm 500mm away from the exhaust outlet, and am concerned that I should source a quiet silencer...Any Stainless Steel or Titanium suggestions?

Also, I may need a header to be fabricated from either material as well. Know of any Fab shops based in the UK?? I am designing the header with RicardoWAVE and Solidworks.

:cheers:

M

davidimurray
10-28-2007, 07:11 AM
Hi

Can anyone suggest any aftermarket cans thatwill meet the requirements that Yardey has suggested. I guess some of the racers on here must have to meet strict sound levels - perhaps you could give us an idea of what measured sound levels you have recorded with various systems.

Cheers

Dave

work_moto
10-28-2007, 07:46 AM
Most are 96db. Silmoto and Akra are anyway.

GPR are louder but loud pipes dont make fast engines so i'm told.

If i were you i'd go for an Akra and get it chopped and re welded to suit.

I know a guy who could chop and re weld to suit but he's in Leeds. He builds exhausts for diesel engines but he made a gsxr exhaust fit his KTM 660 and the welding is as good as Akra do and its Ti too.


I'd be interested in what Micron could do for you with the Serpeant pipework. Could be worth a few more ponies. UK based and extremely helpful. You can talk with them direct rather than going through dealers. Twin pipes with equal headers?

bully
10-28-2007, 08:16 AM
My silmoto was tested at a recent event and it was 100db.

May need a repack.

cal550b
10-28-2007, 03:01 PM
Hi all,
I am looking to purchase a decent silencer / can for our (www.cardiffracing.co.uk) SXV 550 engine.
Part of the scrutineering at our Formula Student / FSAE event, is to not exceed 110dB @ 8500rpm 500mm away from the exhaust outlet, and am concerned that I should source a quiet silencer...Any Stainless Steel or Titanium suggestions?

Also, I may need a header to be fabricated from either material as well. Know of any Fab shops based in the UK?? I am designing the header with RicardoWAVE and Solidworks.

:cheers:

M

a straight through system would be ok for 110db but if its power you need the cheapest rout is just buy stainless akra headers they run at around 300 and work better than anything and fit whatever can.

Olof Eriksson
10-28-2007, 04:24 PM
Hm, we test at 4500rpm, remember that when posting numbers... At 8500rpm its a different story...

I would buy silmoto header pipes and build my own can or buy a used can from a smaller sports bike and modify + repack it. The silmoto header pipes are very good!

If it doesnt make sound regulations, make a ring that restricts 5mm on the end and put steel wire thru the holes of the inner tube 6 or so times.

irie
10-28-2007, 05:27 PM
Hm, we test at 4500rpm, remember that when posting numbers... At 8500rpm its a different story...

I would buy silmoto header pipes and build my own can or buy a used can from a smaller sports bike and modify + repack it. The silmoto header pipes are very good!

If it doesnt make sound regulations, make a ring that restricts 5mm on the end and put steel wire thru the holes of the inner tube 6 or so times.

I would absolutely not buy Silmotor header pipes - they are of uneven lengths.

The Akra headers are nearly equal length and perform better. I've had both.

The silencer length and backpressure can be tuned to get the performance characteristics required. Bits of wire through holes etc. is merely a way of trying to reduce the noise from a silencer/system that isn't performing optimally at a given noise limit.

Far better to design the system right from day one.

Alice Racing
10-28-2007, 05:59 PM
How many races have been won with Akra exhausts ?
How different is the SXV Akra map to the Silmoto map ?
Are all v twin race pipes equal length ?

Try this on Google " Ducati race pipes"

Olof Eriksson
10-28-2007, 06:09 PM
The silencer length and backpressure can be tuned to get the performance characteristics required. Bits of wire through holes etc. is merely a way of trying to reduce the noise from a silencer/system that isn't performing optimally at a given noise limit.

Far better to design the system right from day one.

Redesigning the system is the fastest way to fix a silencer thats too loud at a sound test ;) We have exhaust specialist here that calculate the pipes for a new bike, then he builds 50 pipes wich are slightly different and try them out to find the best working pipe. He say its never the exact calculated pipe that is the best one and that theres a lot of power to gain from trying them out... Its just a matter of what kind of level you're gonna make it.

We did a ring on a KTM and it lost 2hp in the low range and gained 2hp on the high end, it's not always a loss :)

Just out of curosity, is there any benchmarks of akra vs silmoto (vs arrow?)

cal550b
10-29-2007, 04:46 AM
this is a very easy build ,we all know the akra headers are good ,because its a car the length of the exhaust can be what ever you want,so fit a slider which will allow you to tune the pipe to what ever range you require,packing the exhaust can tighter has a dramatic affect on the noice level too,i do belive you have an intake restriction too? which will change the rules of the exhaust where the slider will work also.

Alice Racing
10-29-2007, 04:50 AM
,we all know the akra headers are good ,


Do we ?...........how do we know ?

cal550b
10-29-2007, 04:53 AM
Do we ?...........how do we know ?

akra always get it right.

Yardey
10-29-2007, 07:02 AM
Hi all,
Thanks for of all the replies.

Would anybody happen to know what is the length of the stock header??
Our engine is somewhere mid Atlantic, and going the wrong way..

Many thanks

M