Author Topic: Is it normally this noisy?  (Read 371 times)

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Offline Bentaxle

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Is it normally this noisy?
« on: October 10, 2020, 08:00:32 am »
Hi everyone

I have finally got the C11 to the point of getting it road registered, and have been test riding it to make sure nothing falls off.  It is quite delightful to ride with good manners but it is loud.

Are these bikes normally very noisy?  I bought a new muffler from Classic Motorcycle Spares in the UK, and while it's a good quality item and fits well, I did notice it was a straight through exhaust - no baffles.  Is that how they were new?

Thanks
Mike

Online camman3

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Re: Is it normally this noisy?
« Reply #1 on: October 10, 2020, 08:18:09 am »
I'm not sure which years exactly, but some of the early c10 and c11's had baffle in the pipe section, which was longer.
I don't know about your supplier, but Armours now only make them with baffle in silencer and shorter straight through pipe.
You could fit a slip in baffle if noise is annoying. :-\
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Online Cosmikdebriis

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Re: Is it normally this noisy?
« Reply #2 on: October 10, 2020, 09:03:33 am »
I suppose, by definition, the term "noisy" is subjective. Compared even to the latest 120cc sportsbike the Humble BSA will seem noisy.

Maybe it's a question of what you are used to? Personally I wouldn't say a C series is noisy even without a silencer but I have much louder bikes (The Rudge springs to mind or the velo with the Brooklands can).

On the other hand, if you don't like it, or are getting complaints, then, as has been said, you could improvise a baffle.
A bike on the road... Is worth two in the shed...

Offline haddy

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Re: Is it normally this noisy?
« Reply #3 on: October 12, 2020, 02:33:29 pm »
Hello Bentaxle
This my second c11 and i bought a second hand muffler.
the baffle at the rear had been removed it sounds great watching it drive by but riding it is a bit noisy.My first c11 quiet and comfortable to ride.The engine makes enough noise.If i could put a baffle in mine i will.
haddy

Online donkey

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Re: Is it normally this noisy?
« Reply #4 on: October 12, 2020, 03:29:37 pm »
My c11g has a none perforated down pipe with a straight through silencer its quite  loud and proud also had a Starfire with a Goldie silencer on and it was very loud but I loved the sound .
donkey

Online camman3

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Re: Is it normally this noisy?
« Reply #5 on: October 12, 2020, 04:25:47 pm »
For what they cost, you could experiment with one of these.
https://www.ebay.co.uk/itm/373140165931
Just one hole to drill in underside of pipe if it produces the db level you want.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline ThomasC11

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Re: Is it normally this noisy?
« Reply #6 on: October 12, 2020, 04:51:02 pm »
My C11 has a exhaust pipe that extends far into the muffler. The pipe is closed at the end and the exhaust gases are led into the muffler through holes in the sides. This reduces the noise significantly (similar to the Ebay silencer). On my Sunbeam the exhaust gas is led straight out with the result that the beast is very loud at full load. I am currently thinking about how I can change this.
 
By the way, I find Mike's question completely understandable and appropriate for today's conditions. Noise may be perceived subjectively, but the majority has a surprisingly unanimous opinion. It is 2020 and we should try to ensure that we do not burden our fellow citizens more than necessary. As a minority in traffic, we can only lose a conflict.

Cheers, Thomas
1946 BSA C11
1937 Sunbeam Model 9
... and a scratched Hyundai

Online Pete

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Re: Is it normally this noisy?
« Reply #7 on: October 12, 2020, 08:31:48 pm »
This is what you need https://www.armoursltd.co.uk/product/exhaust-mute-1-38-od/ Stick it on the end of the exhaust pipe, sticking outwards, and put the silencer over it. They work. I have them on both my bikes. Probably made them myself  ;)
Pete

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Re: Is it normally this noisy?
« Reply #8 on: October 12, 2020, 08:52:46 pm »
Yes Pete, same thing really apart from being tack welded in place instead of bolted....neater job, but once its there, its there. :-\
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Bentaxle

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Re: Is it normally this noisy?
« Reply #9 on: October 13, 2020, 12:31:52 am »
Thanks everyone - I will give the Armours product a try.

Cheers
Mike

Offline BSAc11g

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Re: Is it normally this noisy?
« Reply #10 on: October 13, 2020, 12:27:11 pm »
My C11 has a exhaust pipe that extends far into the muffler. The pipe is closed at the end and the exhaust gases are led into the muffler through holes in the sides. This reduces the noise significantly (similar to the Ebay silencer). On my Sunbeam the exhaust gas is led straight out with the result that the beast is very loud at full load. I am currently thinking about how I can change this.
 
By the way, I find Mike's question completely understandable and appropriate for today's conditions. Noise may be perceived subjectively, but the majority has a surprisingly unanimous opinion. It is 2020 and we should try to ensure that we do not burden our fellow citizens more than necessary. As a minority in traffic, we can only lose a conflict.

Cheers, Thomas

If you are going down that route
Extend the exhaust pipe around 4 " into the muffler.
Mark 4 spiral lines that do one revolution over that 4"
Drill along those lines at irregular spacings
On 2 lines opposite each other, start with a 3/8" hole and progressively go down to 1/8"
On the other 2 holes start with the 1/8" holes & go up to 3/8"
Weld a 3/8" thick plug over the end of the exhaust pipe with some randomly placed 3/32 holes .
The original pattern I was given had 9 holes going up in  1/32" incriments .
This was for a side valve sloper.
Gave a nice note for about 20 ' after which you could barely hear it .
Bike Beesa
Trevor

Offline ThomasC11

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Re: Is it normally this noisy?
« Reply #11 on: October 13, 2020, 07:57:10 pm »
Ah, very interesting. I'll check my exhaust length and will then decide how to proceed. Either this guide or the Armours solution.

Cheers, Thomas
1946 BSA C11
1937 Sunbeam Model 9
... and a scratched Hyundai

Offline Bentaxle

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Re: Is it normally this noisy?
« Reply #12 on: November 11, 2020, 02:48:23 am »
Hi all

I fitted the Armours baffle and the exhaust sounds much better.  A nice note without excess noise - doesn't drown out the horn now.  The baffle was fractionally too big in diameter but a couple of hacksaw cuts and it tapped in easily.  Secured it with a countersunk grub screw rather than a weld.

Thanks for the advice.

Cheers
Mike