steve m
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| posted on 14/1/11 at 06:17 PM |
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were can i get an add on exhaust silencer,
I need to queiten down my 7, for my early morning departures
What can i use ?
it needs to be fairly easily removable and not to bulky
Steve
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RazMan
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| posted on 14/1/11 at 06:24 PM |
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Nothing will be more effective than a simple change of silencer. There is something called a decibel killer available on eBay but it would depend on
your existing silencer. What setup have you got now?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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steve m
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| posted on 14/1/11 at 06:32 PM |
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Im using a custom chrome silencer, and its never been quiet
I do not want to change that !!
its the first pic in my photo archive
http://locostbuilders.co.uk/photos.php?action=showphoto&photo=a59976-Mullaney.jpg
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Dave Ashurst
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| posted on 14/1/11 at 06:53 PM |
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Where were you thinking of attaching the additional silencer? Upstream or downstream of the existing one?
There's not much room downstream (I estimate from the photo), and an upstream add on, spliced in, probably won't be something you can
quickly take off, e.g. when you reach a safe distance from the neighbours - if that's what you meant (?).
Otherwise perhaps you're limited to stuffing the aforementioned decibel killer up the tailpipe.
Personally, if I really wanted to keep the existing one, I'd add a permanent other one upstream and the get the engine retuned to match it.
Anything temporary will stuff up the state of tune.
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steve m
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| posted on 14/1/11 at 07:23 PM |
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Would a permant fitted reducer affect power output ?
If i was to put a large washer in the end of the tailpipe, would that reduce the noise?
i have a couple of idea's on how to keep it there
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RazMan
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| posted on 14/1/11 at 07:41 PM |
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If your silencer is re packable then my best advice would be to buy some Acousta-fil - brilliant stuff. I bought mine from one of the shows and it
lasts a hell of a lot longer than the normal fibreglass variant - it also gives a mellow tone.
The pic shows a very small silencer and I'm afraid this is a classic case where size really does matter. A small silencer will always be loud
and your suggestion of stuffing a washer in your tail pipe will only rob power and probably make it sound rather 'farty' .... but still
loud
[Edited on 14-1-11 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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smart51
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| posted on 14/1/11 at 08:23 PM |
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I made a short one to replace the link pipe from the manifold to the main silencer. It was 5" long and reduced the noise by 5dB. Perfect for
track days too.
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bimbleuk
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| posted on 15/1/11 at 03:42 AM |
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From the pic your silencer does look quite small. As a comparison mine was 22" (plus the end caps) long and 6" diameter. Maybe even a bit
over kill but it certainly worked and didn't restrict power on my supercharged 1.6, how does that compair to yours? Does add weight though
unless you get it made in something other than stainles steel.
[Edited on 15-1-11 by bimbleuk]
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Dave Ashurst
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| posted on 15/1/11 at 11:45 AM |
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Just a thought...
If the custom chrome silencer is an absorptive type, is there much (or any) wadding left in it?
How often do you refill it?
In my experience running a modified crossflow on carbs gives the silencer wadding a hard time. For example if the car is in daily use I refill my
silencer every three months. Slight out of tune-ness causes erosion on an exponential curve, slow at first quicker as the erosion sets in and the
change in the exhaust affects the state of tune. Major richness or leanness will see away even the best packed silencer fill very quickly.
I don't know about your engine of course but mine is a modified, sensitive, stressed-out creature, great when in tune, but hardly ever
completely on-song no matter how well set up. It wanders in and out of tune with the weather and the erosion of the silencer wadding.
In fact unless I take extreme care filling the silencer the engine holds tune best once all the silencer material has gone! Just a bit anti-social 
A good baffled silencer would be great.
Probably not much help ... D
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RazMan
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| posted on 15/1/11 at 12:03 PM |
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Sounds like you need Acousta-fil too 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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steve m
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| posted on 15/1/11 at 12:37 PM |
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Thanks everyone
My exhaust does need repacking fairly often, and razmans link, looks promising
Steve
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Dave Ashurst
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| posted on 15/1/11 at 02:13 PM |
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Yes, Razman, I agree with you - your link looks very interesting and I think I'll give them a call.
Thanks, I hadn't heard of that stuff before.
regards
D
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Dave Ashurst
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| posted on 15/1/11 at 02:18 PM |
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In fact I won't call them - I can just buy it on ebay!
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martyn_16v
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| posted on 15/1/11 at 10:28 PM |
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Don't trust the calculator they link to that tells you how much to buy, you'll end up with at least twice as much as you need. Still, at
least I've got enough to re-pack it next time 
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matt_gsxr
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| posted on 15/1/11 at 11:07 PM |
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You could install a turbo on your engine. The turbo is supposed to absorb some of the noise, also by the time the curtains twitch you will be long
gone!
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