NS Dev
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| posted on 13/9/06 at 11:34 AM |
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anybody failed sva on induction noise?
getting worried about induction noise for sva test.
I have a plan of action to quieten the exhaust note for the test, (it is no doubt too loud) but sat in the car I can't even hear the exhaust
over the induction noise!!!!
Has anybody failed on induction noise.
If only the exhaust side of the car is tested I should be ok as the induction noise is obviously worse the other side.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
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Hellfire
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| posted on 13/9/06 at 11:43 AM |
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They don't test induction noise at SVA as such. It's only the exhaust noise, although any external noise coming from anything other than
the exhaust may have a small affect on the overall reading.
Phil
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Schrodinger
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| posted on 13/9/06 at 11:46 AM |
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I havn't got a copy of the SVA manual close to hand but it is measured fairly close to the exhaust so it will soon drown out any noise from the
induction
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Hellfire
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| posted on 13/9/06 at 12:01 PM |
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500mm from the exhaust outlet and at 45 degrees.
You'd be surprised how much influence the induction noise has on the test. 
Phil
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shortie
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| posted on 13/9/06 at 12:04 PM |
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You could try lagging the underside of the bonnett with fireproff matting to cut down the induction noise, SVA just measure noise per say so any noise
will get picked up.
Rich.
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Peteff
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| posted on 13/9/06 at 12:05 PM |
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Are you in an enclosed space Nat, the test is done in the open at Derby and the noise is dispersed a lot more, not echoing off of next door's
fence, garage wall etc.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Schrodinger
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| posted on 13/9/06 at 01:16 PM |
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IIRC it has to be done outside in the open
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NS Dev
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| posted on 15/9/06 at 08:37 AM |
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quote:
Originally posted by Schrodinger
I havn't got a copy of the SVA manual close to hand but it is measured fairly close to the exhaust so it will soon drown out any noise from the
induction
Unfortunately not so!!
Need to verify it with the sound meter but my mate confirmed last night that standing 1m from the exhaust, the induction noise from the other side of
the car drowned out the exhaust noise completely!!!
Air filter pokes out of the bonnet, lengths are much too long to get a decent filter under the bonnet, so bonnet lagging will make no difference.
What I don't know is revs at which the noise is worst, will connect a revcounter and have a look, because what feels like 4500 revs (what i hope
I can wrangle the test at!) sounds a bit quieter!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 15/9/06 at 08:38 AM |
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other thing is the throttles are not balanced yet (need to borrow your synchrometer Mike!) and that may be making them bark worse.
Haven't got an up to date pic but this gives the idea!:
 
progress1
[Edited on 15/9/06 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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chriscook
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| posted on 20/9/06 at 09:09 AM |
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Is this something XE's are known for? My XE on dellortos (45s) and a friends Caterham HPC on throttle bodies both make a lot of induction noise.
Mine isquiteneed down by the bonnet though.
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02GF74
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| posted on 20/9/06 at 11:10 AM |
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quote:
Originally posted by NS Dev
Air filter pokes out of the bonnet,
what is wrong with that - both of mine do and SVA man said nowt about it.
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Mark Allanson
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| posted on 20/9/06 at 07:35 PM |
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Put a temporary throttle stop on it
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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russbost
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| posted on 20/9/06 at 09:48 PM |
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Don't fit a rev counter till after the sva test - they don't usuallyhave any means of checking revs so your judgement needs to be
suitably low.
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