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Old 13-09-2018, 12:10 PM   #1
Cliff Pountney
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Default An exhaust that won't deafen me.

Gents,

I'll admit straight away this is not a Mini project but is a 1.8VVC Rover mid mounted in an Imp. I've found you very knowledgeable on other questions so don't let me down now

I've a home made 4-2-1 manifold flowing into a straight through box and I would like to quieten it considerably. What set ups are you running in the Minis? Ideally I would like to buy production exhaust boxes but if you have any recommendations on custom boxes that would also be great.

The pipe diameter from manifold back is 2 1/2" and I have plenty of space for mufflers.

Thanks,

Cliff
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Old 13-09-2018, 01:08 PM   #2
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Iíve discovered that fitting Jenveys significantly reduces the amount of exhaust noise I can hear!


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Old 13-09-2018, 01:11 PM   #3
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On a more serious note, mild steel is usually quieter than stainless steel exhausts, use aluminised steel if you want it to last longer than regular steel, basically, the longer and wider your mid box and rear box can be the better.


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Old 13-09-2018, 02:28 PM   #4
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You may struggle getting advice on this due to the RWD application.

I think the MG F or Audi TT exhaust are my first choice. Both are designed for similar power outputs of the VVC engine.

They are different diameter bore and have nice twin pipes too.
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Old 13-09-2018, 04:01 PM   #5
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Not to avoid the question too much, but have you looked at some sound deadening options? Would be lighter and easier to fit than more silencers, and very effective.
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Old 13-09-2018, 04:27 PM   #6
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Needs pictures!!
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Old 14-09-2018, 10:11 AM   #7
Cliff Pountney
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Gents,

A few interesting ides. Thanks.

Making something else louder . I sort of did that on the Land Rover by fitting very aggressive tyres. On the Imp I want to make sure it is quiet enough to avoid unwanted attention. I will fit some internal sound deadening but the external noise is also concerning.

I did pick up a brand new MGF back box a few years back but the pipe diameters are much smaller and it didn't seem to make much sense to use it after the struggle I had had to get a (hopefully) good manifold packaged. I'll take a look at the Audi TT and a few other rear engine applications.

Has anyone bought off the shelf mufflers from Jetex or the alike for a K series installation?

Cliff









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Old 14-09-2018, 10:15 AM   #8
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Thereís someone on eBay that makes them to spec with baffles inside to help get the decibels down, Iíll see if I can find a link.


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Old 14-09-2018, 10:19 AM   #9
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https://rover.ebay.com/rover/0/0/0?m...2F112677916229

With sound deadening, I would use something that has a mass loaded vinyl incorporated, it will be much more efficient than just some foam.

https://rover.ebay.com/rover/0/0/0?m...2F182427224278



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Old 14-09-2018, 04:33 PM   #10
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i've experimented with exhausts a lot and found that for a vvc 2" bore is just about right, sticking to 2" rather than 2.5" or bigger will help reduce noise. A straight through silencer will flow nicely and if it's large enough it will be quiet enough, the larger the volume of the box, the quieter it is. A single big box is better than 2 small boxes if space is limited. Exhaust tip also effects noise - keep it the same diameter as the rest of the system, larger tips act like megaphones. I've used jetex before and they are pretty good but last time i looked they didn't do any large boxes (girth is more important than length...).
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Old 14-09-2018, 04:39 PM   #11
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2.5Ē does seem a bit extreme, I only had mine made with 2.25Ē with the intentions of making the power Iím hoping for now


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Old 14-09-2018, 08:06 PM   #12
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I started doubting what tube I used when I built the exhaust. So I nipped out and measured it. It is 2 3/8" ID.

That link is great they have loads of stuff and give the impression they know what they are talking about.

Cliff
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Old 15-09-2018, 10:29 AM   #13
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Quote:
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Girth is more important than length...
Aaaaand I've found a new signature
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Old 19-09-2018, 02:06 PM   #14
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i was waiting for someone to catch that
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Old 19-09-2018, 02:55 PM   #15
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I caught it, I just decided to be an adult about it.


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