Back-pressure pipes?

[The Lone Rider]

Well today on the way driving home from seeing spiderman 3, the rivets came out and now I'm back to the horrible whistly sound. I'm quite sick of figuring out ways to get the thing to stay put. I might just take it to a store and see how much pipes cost.

[The Lone Rider]

I have a set of pipes being made for me from Mr. Muffler in Christchurch. I went in there today and he was heating up one end of a pipe and hammering it down to fit a clasp he was making to fit on the header pipe. So far looks good. I wish I brought a camera.

[xwhatsit]

Cool. As the Australians would say, Emmachizzit?

[The Lone Rider]

They said just over $100 for it all. I'll know 2morrow hopefully as he said to come back in Tuesday morning.

[The Lone Rider]

Work still not done but I have some photos.

Left - Lone bike in its special work area (no pipes on it)
Middled - Bottom end on bike with loose pipe end that will be added shortly
Right - Bottom end fitted on bike, loose end draped over to get an idea

The top pipe (shown as the loose end) is going to me moved up further in angle to create more "size" and appearance then shown in the right picture.

[xwhatsit]

That looks really good. So those are still the standard headers?

Fark that's going to be loud. Does it sound any good sans silencers, or just kind of helicopter-ish?

[The Lone Rider]

Yeah thats stock headers.

I don't know what it sounds like with the new pipes as they aren't done and I don't want to fire it up until it's done (you know... the thrill of the birth of a new beast).

As I think I've explained before, the end pipes slide off the headers, and I've tried the bike with them completely off and I expect it to sound fairly similar with the new end pipes. I DO have a sound clip of it, but I recorded it with my mp4 played and fuck me I can't figure out how to get it to play on a computer as it's encoded in some .wav format I can't find anything about. It doesn't sound like a helicopter.. dunno what you mean by sans silencers.

I'm moving into my new house next week, and just so happens that the plan is to set up recording studio in the room that is across the hall from the garage. So once thats ready I can easily run a microphone cable to a stand to the garage and fire up the bike.

[The Lone Rider]

Went in today and the pipes are all made up save for the bracket to hold them steady to the bike. It looks awesome.

Fired it up... ooooo baby that was some meaness.

He had a cheap dick smiths SPL sound level meter, which the bike measured 85dbSPL in idle and 99.5dbSPL with some revs (not moving)

But, you also have to keep in mind its a cheap meter that isn't calibrated and we were in a box shaped brick wall, cement floor and ceiling building (meaning some narly sound reflections off all surfaces)

[The Lone Rider]

Got the bike today.. all done

FARKKKKKKK... loud. Reached 108db revving the bike while stationary outside in his parking lot.

I'll put up some picks once I give my bike a good wash, and attempt to put my flame decals on the bike.

[The Lone Rider]

Heres one pic of the new pipes (in another thread)

http://www.kiwibiker.co.nz/forums/at...2&d=1180223684

and heres an attachment. I have a video of it turned on idling that I will put up later.

[The Lone Rider]

Here is the video - bike is just idling. Also this was taken with a still camera set to video so it is ok quality and in .mov format (Quicktime is needed). Camera doesn't pick up bass frequencies too well, but you can get the idea :P

http://files.filefront.com/Custom_Ho.../fileinfo.html

[The Lone Rider]

Hmm, I got an email saying someone had replied to this (i have this thread under subscription), but it doesn't seem to be here

Techincally it is pipes with rooted baffles as there are none in there.

The owner of the shop I bought the bike off of has seen and heard them and likes them, same goes for several people at my work. I am planning to get someone to drive it around for me sometime though. Might have to get someone to when Spank is down here on the 9th or whatsiz..

[avgas]

sounds nice man, real nice

[The Lone Rider]

Thought I might add to this post not to have custom pipes for a bike made up like mine unless you want to be slapped with a big fine for modified noisey exhaust. Then again, at the time I forgot super loud pipes aint a good idea if you're driving somewhere at 1am in the morning. Just dont do it eh?! :P

[Brian d marge]

learn from this lesson obe won

I dont want to rain on any parade ( i did the same thing myself , with a triumph back in the day)

but u have slash cut drags ( with a length of??? for what rpm ?? )

yes they will produce more power ( at 1 point in the Rpm range) and yes 108 db is loud

and all for ??

a small increase in power at an unusable rpm ( my triumph kicked it up the top of the rpm range ,,shame I could never use it !)

imdying is quite right , you don't want back pressure , but you do want negative energy wave ?? ( cant remember off top of head at this time of nite) to arrive back at the port over a wide rpm range ( hence the taper or change in dia of pipes )

the reason escapes me why you jet up , I have it here somewhere but it isnt because the returning wave blocks the port ,,, some one can help me here !

If you find that the performance drops of at some lower revs , , try putting a mini can after the header and before the tail pipe , and if its too loud ,, find a pipe similar size to the header , drill heaps of holes in it and wrap absorbent material around it and slip it inside the tail pipe ,,,that way you will have the same look ,( which I think you have done a good job there ) and the db s will drop ( depending on the amount of absorption )

We did a dyno run on an Enfield with a super trapp exhaust ( nice cam shape ) and it lost power ,, and sounded nicer


Stephen

reaLLY SOUNDING LIKE AN OLD FART ......