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Noise reducing tips
marmot0 - 4/2/09 at 02:49 PM

Have my SVA retest on Friday after failing on Noise (108dB). The engine is a CBR954.
I have now fitted the following:
Airbox
Restrictor in the exhaust.
Lagged the engine bay with accoustic foam.
Can anybody think of anything I have missed
Cheers

tegwin - 4/2/09 at 02:53 PM

Do you have things rigidly mounted?

like engine, exhaust etc? If you can reduce the amount of vibration that resonates around the chassiss that might help!

smart51 - 4/2/09 at 02:59 PM

fit a bigger silencer. Really, it is the best way.

marmot0 - 4/2/09 at 03:04 PM

Already have a large 6" can fitted

l0rd - 4/2/09 at 03:15 PM

fit a cat?

Mr Whippy - 4/2/09 at 03:15 PM

quote:
Originally posted by tegwin
Do you have things rigidly mounted?

like engine, exhaust etc? If you can reduce the amount of vibration that resonates around the chassiss that might help!


if its mounted rigid then the car body becomes a loud speaker. I did this on the Falcon with the v6, utterly horrable racket right through the whole car, changed it to rubber mounts, quiet as a mouse

nick205 - 4/2/09 at 05:09 PM

If you have can, rotate the tailpipe end so it points to the ground or even back uner the car away from the testers sound meter.

Guinness - 4/2/09 at 05:50 PM

Ever seen a Jensen Healey engine bay?

They have / had a silencer before the airbox!




Good luck with the test.

Mike

ReMan - 4/2/09 at 09:29 PM

quote:
Originally posted by Guinness
Ever seen a Jensen Healey engine bay?

They have / had a silencer before the airbox!



Good luck with the test.

Mike


Well thats a new one on me, I never knew that!

[Edited on 4/2/09 by ReMan]

iiyama - 5/2/09 at 08:38 AM

How about deadening some panels with acoustic material? Get it off the bay for a few quid and stick it to the inside of thin panels. Kills the reasonance.