32 replies to this topic

[CocoPops]

Just to dig up an old thread, I've just ordered a pair of the 2inch inserts to use with my 2Bular.

[MartinS]

If you can hold them in with C clips its the best solution, but the bolts expanding outwards worked very well as well. Just didnt loook so neat. Good luck, and see you at Abingdon. Martin

[CocoPops]

Gonna go for the 3bolts outwards, I have an inwardly rolled exhaust, so that will stop them dropping out if the bolts are done up. I do like your "neat" solution, but I wanted to get prepared for Abingdon with only 2weeks to go.

[Graeme Lambert]

Any idea whether these might work with a Larini? Or am I on a lost cause... G

Edited by Graeme Lambert, 13 April 2012 - 08:56 AM.

[NickB787]

Think I might get a pair just in case

[bunsenburner]

Thread revival!

 

Does anyone have a picture of these inserts in place?  I'm wondering whether I want 2" or 2.5" inserts.

 

I'm looking to get a couple just in case I need them as I know I'm very close to the static limits.  I'm hoping bolts secured to the inside will work for me.

 

Thanks

 

[bunsenburner]

I have just measured the cans. They are 3" internally but slightly less on the end because of the rolled lip. I'm not sure whether to get 2.5" or 3"

[TheRealVXed]

You'll want 3".  2.5" will rattle around.  They should come up slightly small as they are designed for a 3" exhaust.  If not, get them to somewhere with a milling machine to take off a thou or 2 until they slide in nicely.

 

What exhaust have you got?

[bunsenburner]

The exhaust is a hybrid 2.5" system. I have 3" cans going into a modified turbo back box.

[bunsenburner]

So the decibel reducers arrived from Jetex.  2.5" was the right size.  A cancelled 3" order turned up anyway so at least I could confirm that it was too big.

 

On the top pipe there is very little run to insert the reducer.  When the reducers are fully home the farthest end blocks the bends into the back box so they will need to be cut down to maybe to a prong or two.

 

To hold the reducer in place I had a bit of a brain wave.  I raided the stationary drawer for some flexible metal to act as a retaining clip.  I opened out a metal paper clip thingy just a bit wider than the end of the exhaust.  The lip on the exhaust holds the clip in place.  If I can get the right length it should hold the reducer in place.  It doesn't require any drilling and installing it is a doddle.

 

My only concern now is whether the hot exhaust gas would warp it so that the reducer might fall out.  Any guesses as to whether this will work please?

 

 

 

 

 

 

 

Reducers pushed fully in

 

 

 

 

 

 

 

 

 

 

 

 

[MartinS]

They will be out in a blink. I use strong C clips that sit inside the lip of the exhaust that are strong and a very tight fit but, when both reducers were in one always blew out so I only run with one in and from what we found two made little difference over just one (tested at Goodwood with officials db monitors). I cant copy and paste links for some reason at the moment but there are pictures of mine if you search. If you cut down the pipes you show, one is nearly always slightly longer than the other.

 

Martin S

 

[bunsenburner]

I eventually went for the internal screw approach. The top insert had to be very short though.




http://i1237.photobu...8DE652A49_1.jpg

Edited by bunsenburner, 04 August 2014 - 07:43 AM.

[smiley]

I went through the same fase as you did bb.

All my diy creations blown out over time and had to get my wallet out for decent ones.

 

Last friday one of the guys had some nice tullett db killers on.

Anybody knows if they still sell them?

Edited by smiley, 04 August 2014 - 10:46 PM.