Race cans for road use

Message

rick · #16 Post by **rick** » Thu Apr 01, 2010 9:23 am

Thanks for the info all... yes the ebay link I posted just seemed to be a sleeve and didn't look anything like baffles I've seen before so they're probably not going to do much in terms of dumbing down the sound!

The busters link looks good so I just called Scorpion and they have quoted £20 for each le with £7 delivery... so are going to be cheaper than Busters by £8 which is a result :) The guys at Scorpion said it'll reduce the sound by 3 or so dB which, if I understand it correctly, is quite a lot when you're over 80dB or so.

So delivery within a week and happier neighbours!

Now to just remove the "Race Use" and get a "BSAU Approved" sticker

#17 Post by **mangocrazy** » Thu Apr 01, 2010 9:30 am

rick wrote:Now to just remove the "Race Use" and get a "BSAU Approved" sticker

On my Akrapovic cans the 'Race use only' notice was stencilled in to the riveted bands on the can ends. Mark (my exhaust chappie) simply drilled out the rivets, reversed the bands and riveted them back up again. Job's a good 'un...

Aladinsaneuk · #18 Post by **Aladinsaneuk** » Thu Apr 01, 2010 9:51 am

the renegades i have are a little more oblique - "competition use"

doesn't say only :)

Firestarter · #19 Post by **Firestarter** » Thu Apr 01, 2010 10:38 am

rick wrote:The busters link looks good so I just called Scorpion and they have quoted £20 for each le with £7 delivery... so are going to be cheaper than Busters by £8 which is a result :) The guys at Scorpion said it'll reduce the sound by 3 or so dB which, if I understand it correctly, is quite a lot when you're over 80dB or so.

dB is a logarithmic scale - IIRC 3 dB is something like a doubling in noise, so a drop of 3dB will be a BIG difference.

Not so sure about the stickers etc, you may find it better not changing it, if you get pulled you can point to the baffles, if you point to the sticker you may be done for trying to mislead.

D-Rider · #20 Post by **D-Rider** » Thu Apr 01, 2010 12:49 pm

Firestarter wrote:
dB is a logarithmic scale - IIRC 3 dB is something like a doubling in noise, so a drop of 3dB will be a BIG difference.

Indeed 3dB will be a doubling of the power - however it won't sound twice as loud as the ear does not have a linear response.

rick · #21 Post by **rick** » Thu Apr 01, 2010 12:52 pm

Neighbours will be happy then!

BTW only joking re: BSAU sticker... what I'd like to do is somehow polish the race stamp on it off at the very least... it just removes suspicion (and of course ride with baffles in).

ReggieGasket · #22 Post by **ReggieGasket** » Fri Apr 02, 2010 7:19 am

I have Scorpion race cans which are a bit loud. The previous owner fitted BS stamps on them (off ebay) and they actually went through the MOT! So I'm not too concerned of being pulled. Would prefer less sound though.

Gio · #23 Post by **Gio** » Sat Apr 03, 2010 9:27 am

I ground out the "competition Use" and no bafflkes and no padding either. Plod doesn't even look.

rick · #24 Post by **rick** » Sun Jun 06, 2010 6:26 pm

I'm gonna have a go at polishing it out with some fine sandpaper (1200+) and see how I get on ;)

rick · #25 Post by **rick** » Sun Jun 06, 2010 9:17 pm

Done one of the exhausts... basically grit 600, 1200 then 1500 and plenty of autosol... and repeated... need to buff even more but can't be arsed now! May need to buy a buffing wheel and some more polishing compounds but we'll see. There are still a few little dots to sand out and I'll sort that out again.

Here is before and after... easier than I thought it'd be :)

MartDude · #26 Post by **MartDude** » Sun Jun 06, 2010 9:25 pm

How long did that take you?

rick · #27 Post by **rick** » Sun Jun 06, 2010 9:40 pm

Couple of hours with lots of distractions, so I reckon an hour solid... she still needs a buff but it was easier than I thought :)

Dalemac · #28 Post by **Dalemac** » Sun Jun 06, 2010 10:28 pm

baffles? pfff.

rick · #29 Post by **rick** » Sun Jun 06, 2010 10:40 pm

Baffles removed 'cos I've cross threaded the button head allen bolts ;)

HisNibbs · #30 Post by **HisNibbs** » Sun Jun 06, 2010 10:56 pm

rick wrote:Anyone had any experience with these eBay link

Yep,

Recently fitted them to my Aprilia Carbon Race cans. I didn't specify a diameter and the ones that came were too large so had to be modified to fit. Any ho they don't seem to make a big difference to either the noise or the performance. Certainly not much difference noise wise at idle maybe a little quieter when wound up. I can't say I notice any drop off in performance I suppose if I get pulled at least I can say I'm trying.....