under bike exhaust

[madivi]

Yes it will - jacking up the rear end will compress the shock and also change the angle of the swing arm at the pivot

Alright, had not considered this. So changed linkage levers would give me a softer rear end?
I had felt it like being harder (but haven't really driven it).

What has given me more headache is the soft fork (and my weight ).

[haggisbash]

If you are talking having the exhaust look like a Buell surely you can hide the correct header length inside the can? This will keep the overall length down but will mean no straight thru system which might be too quiet for a TRX So you would have something like what you find in a typical oval type car muffler 'cept have the outlet to the side a la Buell. Looks do-able but I'd rather try a 2-1-2 system with both pipes exiting on the right into two stubby reverse cone megaphones. I know what I have in mind wouldnt get pass the WOF test here but it would sound different to all the can equipped TRX's. Look up earsplitters exhausts to see/hear what I mean

[gregs656]

a lot of folks reckon if you keep the changes equal then you will get a neutral result, which is probably true to some degree, this is quite a big change though and I would expect there to be some difference. Biggest problem is going to be clearance if the motor sat parallel to the ground i don't think that would be a problem.

[Number8]

Well ive been trying for most of the week to sort some kind of underbike zaust

and failed , as far as i can tell it cant easily be done , 2 things because its a drysump bike u don't get the normal huge gap behind the sump that u normally get on wet sump bikes, which in simple terms means there's about 2/3's less room to play with
The second thing is the sodding suspension linkage, hanging down in the way all the time !!! no combination of pipework and cans that i could muster , and for anyone thats seen my garage that's alot!

i Even went as far as fabricating a totally bespoke back box that wrapped round the suspension linkage , but to get it so u had sufficient ground clearance means that it was so small it did little to no silencing , ive tried so many things radical and not and unless u want it so loud u might as well just be running the downpipes its not possible
the only reason is lack of space under the bike and anything that comes close to standard silencer size infringes on the ground clearance !

So the argument about lengths is irrelevant cos there just inst the room!

so i settled for this


oh and ignore the 2-1 section ... ahem i ran outa 1' 75th pipe so i had to bodge that up ..... got some on order

http://s250.photobucket.com/albums/gg26 ... 63a5b0.flv
thats a short vid of the can running , its sorta loud but ive heard worse

[gregs656]

not going to have any clearance issues with that

looks good

[bobtrx]

8 Look'n at your pic with the wrapped headers , what is the reason for round piece between the down pipes

[Killerwhale]

8 Look'n at your pic with the wrapped headers , what is the reason for round piece between the down pipes

As they come from me so.....
Think it was covered before but perhaps on the old forum, it´s to cancel out the backpulses...very simply put.
Gives a tad more low omphhh.

[Number8]

8 Look'n at your pic with the wrapped headers , what is the reason for round piece between the down pipes

As they come from me so.....
Think it was covered before but perhaps on the old forum, it´s to cancel out the backpulses...very simply put.
Gives a tad more low omphhh.

what kw said .....

seems to sot out my fueling a treat 2 ...

i always had a small hesitation after being on the throttle for ages if u shut of completly then got back on it quickly there was always a moments hesitation .... thats all gone now .

also from my rudmentry knoledge of exhaust gas flow speeds and such the thing on the front also acts like a expansion chamber greating greater backpressure on the exhaust valves , so turnng the exhaust pulses into uesfull back pressure ... or sumit like that

seems to work a treat tho
funny riding in the rain with the wrapped headers , when u stop at lights etc u steam quite alot ... i got caught out coming back from my parents yesterday!!

oh yea and the pics in the folder of the stubby can thingy , would u belive that was quiter than the current setup!!!

[Killerwhale]

8 Look'n at your pic with the wrapped headers , what is the reason for round piece between the down pipes

As they come from me so.....
Think it was covered before but perhaps on the old forum, it´s to cancel out the backpulses...very simply put.
Gives a tad more low omphhh.

what kw said .....

seems to sot out my fueling a treat 2 ...

i always had a small hesitation after being on the throttle for ages if u shut of completly then got back on it quickly there was always a moments hesitation .... thats all gone now .

also from my rudmentry knoledge of exhaust gas flow speeds and such the thing on the front also acts like a expansion chamber greating greater backpressure on the exhaust valves , so turnng the exhaust pulses into uesfull back pressure ... or sumit like that

seems to work a treat tho
funny riding in the rain with the wrapped headers , when u stop at lights etc u steam quite alot ... i got caught out coming back from my parents yesterday!!

oh yea and the pics in the folder of the stubby can thingy , would u belive that was quiter than the current setup!!!

Glad it worked for you 2!
I´m going to get my MAB system done as well but they have to be welded mounted as the pipes are individual...
Going to wrap the pipes as well!


(you should have seen the smoke just after having it done!!!!!!)

[madivi]

Just to give an idea what it might look like.
Silencer extends aft engine mount

about 12 cm static clearance (as long as I mind the middle of the roundabout )

look at it without the left one

not seen, but oilfilter is a problem too (silencer needs a dent)


Doesn't look so bad after all?

[Number8]

hey i know them ... set od stnadard cans from a r1100s

and i still rekon when u take it off the paddock/axle stand's and then out ya weight on it its gonna have issues , i tried a very similar idea with a homemade can that was much smaller diamater than most

ive actaully got a set of standard cans from a r1100s in the garage some where ..... ile have a play tommra, wonder if u could split them at one end and and have one either side of the bike .....

my bike when sitting on it is 222mm from the floor to the bottom of the metal swing arm mount thingy , and ve got a yzf swinger n shock so it a bit taller than most

if it dose werk kool , but i still think ya gonna have issues

[idl1975]

Time to play again , I want to do a exhaust system under the bike like a buell etc. I have standard headers and Over system to work out header lengths but don't have any info on muffler dimensions to suit . is there a distance from collectot to muffler Is there a formula , can anyone help in this area

Kinda like "froggies" bike!?

Is this by any chance the ""Akrapovic"" system currently advertised on e-bay uk? Looks suspiciously similar...

[madivi]

...and i still rekon when u take it off the paddock/axle stand's and then out ya weight on it its gonna have issues ...

I'm not having it on stands. Two stands are just keeping the bike from falling on either side.
So what's missing is just my subtle weight.

I'll direct the exhaust gases downwards to get more lift

[funnymachine]

I bought the "French" exhaust and I met Youngy and had a look at his full Akro system.

The headers on the one I have are shortened to get it under the bike as is the can which has been modded and welded on.

I think it will work okay for what I am building but may be a tad loud.

I'll found out once I get the springs and things.

If you want comprehensive pics of it or measurements just ask (PM me)

Best

Mark

[bobtrx]

Went and seen a local exhaust bloke about making a system , turns out he's into bikes and wants to do track days so we got on pretty well . Exhaust work starts after Oran Park day with the boys and from what we have come up with so far it is looking OK using oval mufflers etc . I've had a play with one of my earlier cans and moving the headers to suit