Straight Cut Pipes

[gimpy limp]

Will this cause the bike to lose power, I always thought that it did but looking at this auction surely you wouldn't pay 560 quid for pipes that lose you power:

https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=25623&item=7969932380&rd=1&ssPageName=WDVW

https://i18.ebayimg.com/02/i/03/c3/7c/a0_1_b.JPG

I have access to proper pipe bending machines and welding equipment

I was gonna make my own pipes like this because their so hard and expensive to buy:

https://www.mourneman.co.uk/motorbikes/images/bikes/honda_cx500a/07.jpg

what are the complications of doing that?
____________________
-=[Sam/b]=- cx500's the only way to travel, we do it in style just like jimmy saville
msn addy - [email protected]
https://pre-auto.com/cx500/rat_and_survival_gallery_2006

[Bezzer]

Lose power?, of course they do, no back pressure at all, but it's a custom and 99% of their riders don't know any better. All show, no go and totally illegal sound wise.
Experiment with your own dude but just check the mixture when you're done to make sure it's OK and you're not doing any damage.
____________________
I used to be indecisive but now I'm not quite so sure.

[Odie]

I run open pipes on my trike.
Never been stopped for having them fitted or failed an M.O.T with them on.
As for back pressure, 4 strokes dont need much.
Have you ever seen or heard of "tuned length" pipes?
They only have a silencer fitted to "tuned length" pipes to quieten them down.
The problem with open pipes is that you burn out your exhaust valves quicker.
____________________
You are so ugly when you were born the doctor said "I?m gonna drop it, if it falls is a rat, if it flies is a bat."

[mchaggis]

Unsilenced pipes should be pretty damned easy to tune compared to ones with sidebranches, silencers and what have you on. Just make them the right length/ width and you're done.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[pipnet11]

You ever stood next to a F1 car when it starts up? no silencers in those exhausts I can promise you.
____________________
I love the girls that do, I hate the girls that dont, I hate the girls who say they will and then they say they wont, but the girl I like most of all and I think youll say Im right, is the girl who says she never has but looks as though she might. - Max Bygraves

[sickpup]

[BlueNinja]

The Moto GP bikes have straight throughs, sometimes no baffles.. if it looses power I doubt some how they would use them

Just wear your plugs, because it will cause hearing damage after a while.
____________________
Big Kawasaki ZXR 400 project here:
https://www.theundertaking.com/index.php?showtopic=483

[BlackSheep]

This is a pic of my wifes Trike running open pipes with no baffles
at all , it runs lovely and has been set up to cope with them
and yes it is incredibly loud but thats a good idea as it gives you time to get out of her way when you hear it coming
____________________
GSXR 1100 StreetFighter

[Bezzer]

You're all mostly missing the point trying to have a go, most with little idea of what they are talking about. I never mentioned anything about baffling at all I'm on about the STRAIGHT tube pipes as a reply to the initial post not the merits of silencing.
4 strokes DO need a bit of back pressure to make sure all the exhaust gases are "sucked" out.
The race can argument doesn't apply, the extra volume of any larger diameter than the pipe can, full or empty of baffles it matters not, fulfills that need to certain degrees of usefulness.
The optimum exhaust is a tube that runs from the exhaust port and gently tapers out along it's whole length which gives back pressure, think you'll find that this is the technology that the F1 type cars use as are some MotoGP bikes.
And as for

[feef]

4 strokes can and DO use backpressure from a "tuned" pipe to aid exhaust gases leaving the combustion chamber... this is exactly what EXUP and other such powervalves do.. they vary the pressure wave in the pipe so it bounces off the exhaust valve just BEFORE it reopens to let the gases out, producing a slight negative pressure to "suck" out the exhaust.

a
____________________
Mudskipper wrote: feef, that is such a beautiful post that it gave me a lady tingle
Windchill calculator - London Bike parking
Blog and stuff - PlentyMoreFish dating

[haGGard]

I was riding behind some guy on an old bike. His exhaust looked like he had chopped an end of a car exhaust off and stuck it on his bike. It was a right bodge job, looked dogey and was loud as f00k. I can remember thinking 'surely that cant be legal'...
____________________
chaff mans random tingz on loot
"Why dont you go and weld your face to a moving train, you sack of pus" - tobyr
"ROFL MY TOFFLE I AM TEH 1337 SPELLING MISTAKE FINDER!" - BikerBen

[mchaggis]

re. Babyblades post.

Hence why tuning a silenced pipe is much more difficult. You get a pressure wave reflection from any area change, so you'll get a far more complicated combination of waveforms bouncing up and down the pipe, far more difficult to work out the exact length you need.

It must be said that a lot of cruisers with straight through pipes w/o silencing look as though their appearance is the most important thing.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[pipnet11]

[Kram]

[sickpup]