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Author Topic: Decibels  (Read 61449 times)

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Doc

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Re: Decibels
« Reply #210 on: April 30, 2008, 07:43:18 pm »
 :o Evo550! you're lucky the oldfart left for uNZud today..he'll be chomping at your heals when he reads your post! I best PM him now to warn him so he doesn't instantly self implode when he spots it ;) :D
« Last Edit: April 30, 2008, 07:46:42 pm by Doc »
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Offline GD66

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Re: Decibels
« Reply #211 on: April 30, 2008, 08:12:15 pm »
 Well, it certainly indicates that we should be able to get under or acceptably close to MA's new limit ( with their tolerance level taken into account ) without too much pain and pus, and without having to fit speedway-style turbo mufflers to the bikes. As I have mentioned before, once it has been observed and noted that we are trying to comply, I am sure the fuss will die down, and the focus will transfer elsewhere, hopefully to another unrelated branch of the sport . But thanks to those of you who went through, and passed on the results to indicate some idea of where we stand. You, of course, KB, should receive the weekend's Faecal Agitator award, but I'm sure you'd have had plenty of stiff opposition.... :D
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Offline evo550

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Re: Decibels
« Reply #212 on: May 01, 2008, 08:50:23 am »
Doc,
I fear no Kiwi, having been married to a female of the species for many years, I doubt anything the men could come up with would compare(hell has no fury and all that)
Just to stir the whitebait nest and komra nest a bit more, I have attached a photo of a real fourstroke evo bikein the making, coming soon to a track near you............and all under 96.
« Last Edit: May 01, 2008, 08:57:19 am by evo550 »
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Offline GMC

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Re: Decibels
« Reply #213 on: May 01, 2008, 10:51:34 am »
So can anyone report how any of my pipes tested?
I asked a couple of guys on Sat. night  to test for me not knowing thier was no testing on Sunday.
The only result I know so far was a CZ sidepipe 360 that came in just on 100 Db.
Due to space limitations this is one of the shortest mufflers I build.
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Maico31

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Re: Decibels
« Reply #214 on: May 01, 2008, 02:12:32 pm »
Evo is that the old XT550 getting a face lift?
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Offline evo550

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Re: Decibels
« Reply #215 on: May 01, 2008, 04:22:23 pm »
I refer to it as the "Pheonix rising from the ashes", but perhaps I'm a bit bias. You may well say the "Old xt550" but your tune shall change after we slay a packful of pityful maicos.
The day of reconing is coming. (insert crazy homeless man with sandwich board icon)
« Last Edit: May 01, 2008, 04:25:01 pm by evo550 »
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Offline Freakshow

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Re: Decibels
« Reply #216 on: May 02, 2008, 05:11:37 pm »
What if we can try this little item.

Turn it around for testing, ........oops turn it back for the Racing.

 Looks like a great idea.  Ahhhh 1974 the year of everything ever invented  ;D
« Last Edit: May 02, 2008, 05:14:08 pm by Freakshow »
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline Tim754

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Re: Decibels
« Reply #217 on: May 02, 2008, 10:17:04 pm »
Found an old noise test slip from Heathcote Park drags before, Of course there are ? limits as such for ANDRA drag racing. Test at Five meters on staged /released  Kawasaki 750 triple two stroke rail frame ,slick tyre ,wheelstand control fitted, reading "129.08 decibels has Passed testing procedure" !!!! :o Tim     Quiet ,cute, cuddly,likes baby pets not that Kwaka..
« Last Edit: May 02, 2008, 10:23:28 pm by Tim754 »
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Offline Freakshow

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Re: Decibels
« Reply #218 on: May 07, 2008, 07:41:58 pm »
IM thinking to muffle some bikes is a crime against humanity .....

http://video.google.com/videoplay?docid=-399655162231091875&hl=en
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline Tim754

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Re: Decibels
« Reply #219 on: May 07, 2008, 07:56:21 pm »
Like 1000cc Vincent HRD Speedway sidecars at any revs... and 850cc Norton VMX sidecars powering up a slippery hillside, and of the genuine 3 and 4 and 6 cylinder MV Augusta factory road racers with Agostini on board at Phillip Island when they came to Australia a few years back and any CCM and....................... ;)
« Last Edit: May 07, 2008, 08:09:47 pm by Tim754 »
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I may not agree with what you have to say, but I'll defend to the death your right to say it.
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YSS

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Re: Decibels
« Reply #220 on: May 07, 2008, 08:00:23 pm »
Tim , I hade my 1000 Wasp tested at CD 5 , it came in at a low 108 Decibels . There you go . I thought it was pretty quiet. ( on idle anyway )
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Offline Tim754

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Re: Decibels
« Reply #221 on: May 07, 2008, 08:04:11 pm »
Mmmmm big bore and stroked Yamahas another gorgeously sweet sound!!!!!!!!!!! only 108!  better cut the shitty mufflers off Walter and try again :)
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I may not agree with what you have to say, but I'll defend to the death your right to say it.
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firko

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Re: Decibels
« Reply #222 on: May 07, 2008, 08:07:06 pm »
Bernie Ellis' 1981 490 Maico with a Maicos Only Wheelsmith replica pipe and a stock Kawasaki KX500 muffler came in at 92db. Bernie has never repacked the muffler in the 8 years since he built the bike so If that passes I reckon it won't be too hard for everybody else.........I have to agree, Walters Yamaha outfit sure did sound like a race bike should. Music to the ears.
« Last Edit: May 07, 2008, 08:09:44 pm by firko »
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YSS

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Re: Decibels
« Reply #223 on: May 07, 2008, 08:20:49 pm »
Dont worry to much Tim , it will only get used on CD s once ayear, so there should not be a problem . It was OK for 30 years , so I dont think I will change anything now.
Quote from: Tim754 on May 07, 2008, 08:04:11 pm
Mmmmm big bore and stroked Yamahas another gorgeously sweet sound!!!!!!!!!!! only 108!  better cut the shitty mufflers off Walter and try again :)
« Last Edit: May 07, 2008, 08:22:30 pm by YSS »
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Rosco400

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Re: Decibels
« Reply #224 on: May 08, 2008, 07:22:41 am »
My mate on his old DR fitted with a hotdog pulled an amazing 116 db, has anybody been known to beat that ???
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