scootz
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| posted on 29/11/08 at 01:35 PM |
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V8 Exhaust... Again!
Right... getting to that stage!
The new plan is to use both the OEM manifolds (1.5 inch pipes to 2.5 inch collector) - a short 2.5 inch link pipe for each (no cat) - and then 2 back
boxes.
What considerations should I make in relation to selecting the 2 back boxes?
Is it safe to assume that any box with a 2.5 inch inlet will be a safe enough bet?
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jacko
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| posted on 29/11/08 at 01:58 PM |
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I may be wrong but i think r1 can's have 2 1/2ins pipes going in
it may help you
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v8kid
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| posted on 29/11/08 at 02:42 PM |
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Make sure the back boxes are long enough. I fitted ones about 18" long and the noise measured 109.5dBA thats about 50% above our local track
limit. Apparantly the longer the box the more effective it is
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mr henderson
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| posted on 29/11/08 at 03:26 PM |
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Are you sure you will be OK not fitting catalysts? How old is that engine (IIRC Audi V8).
John
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bitsilly
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| posted on 29/11/08 at 03:47 PM |
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In discussion with Merlin, they said it is the width (larger diameter) of the silencer box which reduces noise rather than the length.
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scootz
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| posted on 29/11/08 at 04:40 PM |
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quote:
Originally posted by mr henderson
Are you sure you will be OK not fitting catalysts? How old is that engine (IIRC Audi V8).
John
Different project John... the RS4 engine is for the road car - I'm using an older V8 for a track car.
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v8kid
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| posted on 29/11/08 at 05:14 PM |
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Ah! so it's the width that counts.
I always thought the width altered the frequency and the length was the attenuation.
Merlin should Know I wonder what the ratio is? Twice as wide twice the attenuation?
David
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mr henderson
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| posted on 29/11/08 at 06:05 PM |
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Some interesting stuff here
http://auto.howstuffworks.com/muffler1.htm
John
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scootz
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| posted on 29/11/08 at 06:57 PM |
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Ta
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