mark_mcd
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| posted on 11/2/07 at 11:06 PM |
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How Loud Is A BEC compared to a CEC?
As the title states really! How quiet or loud can you make these things? I presume they can't be that bad since they have to pass SVA? Anyone
use one on the road and does reasonable miles?
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Confused but excited.
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| posted on 11/2/07 at 11:10 PM |
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A bike engined car, will be about as loud as a bike engined bike, if you use a bike engine silencer.  
Seriously it all depends on the engine/can combination.
[Edited on 11/2/07 by Confused but excited.]
OOoooh look, my thousandth post and Chris has only just realised I'm a freak!
[Edited on 11/2/07 by Confused but excited.]
Even though I've been a contributor since 17/10/2006! But I've given up on that.
[Edited on 11/2/07 by Confused but excited.]
Tell them about the bent treacle edges!
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bigrich
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| posted on 11/2/07 at 11:12 PM |
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i found induction noise to be worse than the bike race can
my new build will have a standard airbox fitted to lessen the noise
in theory you should be able to make it as quiet as a standard bike with a road legal/standard silencer
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Bob C
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| posted on 11/2/07 at 11:39 PM |
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mine is R1 engine, R1 can & pipercross type foam filter. It passed the SVA noise test.
I took it out briefly today. f*** me it's loud...
Bob
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Simon
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| posted on 12/2/07 at 12:50 AM |
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quote:
Originally posted by Bob C
mine is R1 engine, R1 can & pipercross type foam filter. It passed the SVA noise test.
I took it out briefly today. f*** me it's loud...
Bob
As the examiner said on my test "101db hurts my ears, this doesn't"
My cec (R V8) had homemade silencers 5" dia (and approx 15" long) with 2" pipework and perforated pipe inside cans.
Remaking all in stainless with additional silencing (turbos)
ATB
Simon
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chockymonster
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| posted on 12/2/07 at 01:29 AM |
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My Bec went through SVA at 97db (off the top of my head) Rattles are a big killer!
PLEASE NOTE - Responses on Forum Threads may contain Sarcasm and may not be suitable for the hard of Thinking.
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smart51
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| posted on 12/2/07 at 08:13 AM |
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It depends on what silencing you for to your exhaust and inlet. In general BECs are louder than CECs simply because they rev louder. In practice,
the straight cut box adds a bit of whine into the inlet roar and exhaust bark.
If you fit a big silencer and an airbox to a BEC, there's no reason why it can't be as quiet as a CEC. a CEC I knew was once measured at
123 dB(A). Strangly, I K&N filter instead of a foam filter reduced the noise quite a bit.
My BEC measured 101 dB at SVA on an R1 can and measured 102dB at Elvington on a 6"x 26" straight through can.
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zxrlocost
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| posted on 12/2/07 at 09:27 AM |
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its all to do with the CAN
standard bike can sweet and quiet
stripped out Micron you will be deaf but thats what I like
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ChrisGamlin
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| posted on 12/2/07 at 01:52 PM |
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Don't forget though that the Db ratings on bike cans are for a specific drive-by test for road bikes and thus completely irrelevent to the tests
a car needs to go though at SVA or at a circuit.
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