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Post by slugshot on Mar 22, 2014 13:41:39 GMT
The pressure's on you now Paul, ill not enter until you get a pass.
I hope I have a dodgy meter as I cannot get mine close to legal with the oe pipe.
My tests show that no silencer with pass as the bulk of the noise comes from the motor.
If the silencer was pointing forward along side the driver it would be more isolated from the motor for the test. My std silencer is very quiet at 8800rpm and all sound comes from the motor.
But as I said I do hope my meter is wrong.
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Post by andy7b on Mar 22, 2014 13:43:54 GMT
Our tR1kes meet the MSVA regulation easily but they check at a lower revs than castle Combe want to check at, I think this is why even some standard systems struggle. I can't remember exactly what the number was, around 5500rpm I think but castle Combe want 3/4 of maximum so that's 9800 rpm for me and 10500 rpm for Paul with his newer engine. That makes a lot of noise from the engine itself let alone the exhaust note. Having said all this I would still love to attend just to come and say hi and have a look at other peoples stuff :-) I will get noise checked when I get there and if it's ok then great and if not then I get to eat ice cream and get sunburnt hopefully :-) Andy
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Post by Deleted on Mar 22, 2014 13:58:22 GMT
I had issues with noise at IVA.. And the majority of the problem was engine noise, and the turbo boosting while stationary. As the test is for exhaust noise, not general background and engine, I asked how it's a fair test. It isn't on rear engined. So, applying some ahem logic.. I extended the tailpipe to the furthest extent of the car, behind the tyre. This meant at the test angle from the tailpipe exit, the meter was sort of shielded by the wheel, from the screaming engine.
Maybe off topic, but, food for thought?
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Post by paulh on Mar 22, 2014 14:26:24 GMT
I have a feeling engine noise could be a problem for me too. I wear ear plugs most of the time because of the induction noise
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Post by slugshot on Mar 22, 2014 14:42:11 GMT
Not off topic at all Steve,
This is how mine will be, with the pipe exit shielded by the seats and bulkhead near the front wheel.
It might be worth covering you airbox Paul if practical.
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Post by nigel on Mar 22, 2014 14:50:29 GMT
Our tR1kes meet the MSVA regulation easily but they check at a lower revs than castle Combe want to check at, I think this is why even some standard systems struggle. I can't remember exactly what the number was, around 5500rpm I think but castle Combe want 3/4 of maximum so that's 9800 rpm for me and 10500 rpm for Paul with his newer engine. That makes a lot of noise from the engine itself let alone the exhaust note. Having said all this I would still love to attend just to come and say hi and have a look at other peoples stuff :-) I will get noise checked when I get there and if it's ok then great and if not then I get to eat ice cream and get sunburnt hopefully :-) Andy I think you've hit the nail on the head Andy. Must confess not to familiar with the MSVA regulations but:- ---------------------------- MSVA regulations call for :- Run the engine at a constant speed of; ¾ of its maximum power speed if that is less than or equal to 5000rpm or ½ of its maximum power speed if that is more than 5000rpm 3. Check that the level of sound emitted for mopeds, motorcycles and light quadricycles is not more than; a) 91 dbA with an engine capacity of 80cc or less b) 94 dbA with an engine capacity of more than 80cc but not more than 175cc c) 99 dbA with an engine capacity of above 175cc for motor tricycles and heavy quadricycles is not more than; d) 99dbA --------------------------- (With the Yamaha engine revving in excess of 5000rpm and qualifying as a motor tricycle) Simply that means:- MSVA = 99db at 1/2 Max Power Speed v's Castle Combe 100db at 3/4 Max Power Speed (Max Power Speed ? Revs Per Minute) --------------------------- Somebody please correct me, Somebody that's done an MSVA test is it at 1/2 max revs or 3/4? nigel
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Post by paulh on Mar 22, 2014 15:08:08 GMT
msva tester may well ask what maximum revs are and use half that figure. I know you used to be able to get round the diesel emmisions by adjusting the throttle stop to limit revs. I once took a van for mot and it failed badly on emmisions, only to pass an hour later with air filter removed and bolt under the pedal adjusted. Im sure the noise testers at Castle Combe will have more idea of what the bike engines will rev too. I have looked at my standard cans and if i put them on the outlets would be much higher and closer to the engine, so my best hope is a pair of motad venom cans with baffles fitted. going on your figures Nigel msva should have been around 7500 rpm and Castle Combe will test at over 10,000 rpm. Thats quite a big difference!
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Post by nigel on Mar 22, 2014 15:24:28 GMT
msva tester may well ask what maximum revs are and use half that figure. ......... The key question to me regardless of what the MSVA tester thinks the max revs are, dose he test on 1/2 or 3/4? Because this a mega difference and maybe the reason Kevin's tests are not working out. I personally had assumed that if you qualified for MSVA then you shouldn't have a problem at Castle Combe but this might not be the case. Can someone please confirm if the MSVA test is done at 1/2 or 3/4 max rev's. nigel
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Post by Stiggy on Mar 22, 2014 18:46:09 GMT
Circuit owners assess on the basis of the potential noise to be emmited. In other words, they will assume that no one will drive around a race circuit whilst limiting the revs to 50%. A drive by test may be an option. At the end of the day we do not want to be the ones resposible for circuit owners getting in to trouble so we must ensure our cars are not going to cause issues. The reality is that continually people get an IVA test passed (or MSVA) and then take the urine by doing what the heck they please afterwards, thus making a complete farse of the test. Thats fine on the roads as police don't carry db meters and nor do MOT test stations. On circuits we must assist the owners to ensure we are welcome in the future.
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Post by nigel on Mar 22, 2014 18:56:59 GMT
Circuit owners assess on the basis of the potential noise to be emmited. In other words, they will assume that no one will drive around a race circuit whilst limiting the revs to 50%. A drive by test may be an option. At the end of the day we do not want to be the ones resposible for circuit owners getting in to trouble so we must ensure our cars are not going to cause issues. The reality is that continually people get an IVA test passed (or MSVA) and then take the urine by doing what the heck they please afterwards, thus making a complete farse of the test. Thats fine on the roads as police don't carry db meters and nor do MOT test stations. On circuits we must assist the owners to ensure we are welcome in the future. Couldn't agree more Stuart. However I'm not convinced that's the case here, as correct me if I'm wrong please, my reading is that Castle Combes noise requirements are more stringent than the MSVA requirements, and possibly more than the factory standard for a R1 motorcycle. If this is the case then it's not surprising that the tR1ke owners are cautious at booking Kitfest track time. I think this issue if it is a problem needs some careful thought. nigel
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Post by Deleted on Mar 22, 2014 20:40:36 GMT
Yeah it's funny. I bought a factory exhaust silencer just for this years Curborough meet. Only to find it's been moved 210 miles South to a track that barely allows any sound on it's track.
I can't see people wanting to spend even more money on what would be an exhaust purely used on one track.
Maybe I'm wrong, but 2 exhausts is quite enough for me.
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Post by Paul (madeye) on Mar 22, 2014 21:26:35 GMT
I have a brand new rsv4 standard can with 2 pass baffle and built in cat. Its for the rocket Iva, if anyone wishes to borrow, it will no doubt strangle a fair bit, but get you on track. It needs to come back as mint as it leaves though for new plate. But its there if anyone wants to lend it
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Post by slugshot on Mar 22, 2014 21:40:25 GMT
Thanks Paul, Tried one today, along with several others...the can worked great at quietening the exhaust but it just hi lighted the engine noise.
It might be worth trying on a rocket or sonic though if they think they're border line on noise.
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Post by Deleted on Mar 22, 2014 21:51:14 GMT
Not that it helps, but my BCS system was measured at 86db at Aintree.. (didnt expect that )
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Post by tommo on Mar 22, 2014 21:56:49 GMT
Tommo, Im not far from Castle Combe so when would be a good time to come up and do a noise test. I have 3 different sets of cans, including the standard R1, which I can use Hi Paul, no problem at all. Give me a buzz on 01249 784 163 on Monday and we'll arrange a date to get you down for a noise test. Let's wait for the outcome of that and we'll have a much better idea of where we are.
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