Next exhaust mod on the ‘to do’ list

[Anonymous]

I am in the planning phase of my next little homemade exhaust mod. It will be a series of aluminium “quiet” inserts for my modified Ducati muffler, installed on the wr450f, as seen in a previous post.

It’s not that I think the new setup is overly loud for the bush, but more a case of experimenting to see if reducing the outlet size of the tailpipe, has any effect on the low down power and torque. It will have a secondary effect of reducing the sound level as well. I actually like having a big loud exhaust as it compensates for my miniscule dangly, wobbly bit.

The current size of the Ducati tailpipe is 48mm ID. I plan to make inserts of 35mm ID, which is what the White Brothers muffler for my bike is . The others I plan to make at 32mmID, which is the YZ450 tailpipe size.

There are two designs I want to use. One is a straightforward sleeve with a tapered leading edge.

The second design will be a central hole with satellite holes drilled around the circumference. This one will be alot of fun to make, particularly the calculations required to figure out the equivalent area of a large single hole, using 12 smaller holes and medium size central hole.Plus marking it all up and calculating taper angles.

I am just waiting to get some alloy bar, as I tried with steel hollow bar, but it was just too hard for me and my lathe to work with.

[Mick DMember]

Hey Nigel ol mate,
How’d you get on with your inserts? Did they work or did they fly out and break your neighbours window?

[Anonymous]

Nah Mick, they haven’t been created as yet. I still just need to get myself a length of suitable aluminium bar to do the job.

I don’t think I will have them for testing at the xmas party, so I will bring up the standard muffler, just in case my home made system is obnoxiously loud.

[Mick DMember]

slug wrote:

Quote:

Nah Mick, they haven’t been created as yet. I still just need to get myself a length of suitable aluminium bar to do the job.

I don’t think I will have them for testing at the xmas party, so I will bring up the standard muffler, just in case my home made system is obnoxiously loud.

Don’t worry to much mate,I get obnoxiously loud after a few beers.

[Anonymous]

Nice work Slug. You’ve got some fun little projects on the go there. If you still want a job how about you come do mine and I can work on bits for my bike all week? :laugh:

[Author]

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