New Chamber

**koba** · 14th July 2009, 19:50

Originally Posted by F5 Dave

\ There was a bit of a mismatch to transfer Height for the super aggressive baffle, but it was a 'bit of a laugh' wheelie bike so I never tried to redevelop it.

I imagine it may have got even worse with the KTM chamber Ola put on it, I was crying more than laughing when I rode it!

**Skunk** · 14th July 2009, 20:07

Originally Posted by F5 Dave

Software is all very well, & draws a pretty picture, but I have never seen a header only 55mm long. It just don't make sense.

You're reading it wrong Dave. The header is well over 400mm long...

Originally Posted by TZ350

Hi Glen, is that the Mota Pipe programe?
Can you post the basic data you used so others can have a play and see what comes up?

It's not MOTA. It's IWT Racing. The figures used are all in this post's images.

**F5 Dave** · 14th July 2009, 20:34

ya know I don't think I am, looks like 1st section is port LX 45mm (which is correct for the H from my old notes). Then a parallel section of header 54.8mm & then Diffuser 1 is L1. It is 409 long & 4.76 degrees (included). That is no header.

Actually it is a queer angle for a diffuser too. 9 & 14 may have been more suitable for a 2 stage diffuser.

**ajturbo** · 14th July 2009, 21:00

well done matey..

last time i saw it, you were just drawing on the 0.9....

now this.. well done!!!

**speedpro** · 14th July 2009, 22:08

Originally Posted by F5 Dave

ya know I don't think I am, looks like 1st section is port LX 45mm (which is correct for the H from my old notes). Then a parallel section of header 54.8mm & then Diffuser 1 is L1. It is 409 long & 4.76 degrees (included). That is no header.

Which leads to the skinny looking centre section. It'll be interesting to see how it shapes up on the dyno.

**Sketchy_Racer** · 14th July 2009, 23:15

Originally Posted by TZ350

Hi Glen, is that the Mota Pipe programe?

Can you post the basic data you used so others can have a play and see what comes up?

.

Hi TZ,

Yeah it's the (edit) sorry its not the Mota, it's program Skunk mentioned. All the info is in the screen shot but here is the info that are knowns from my specific motor;

Exhaust port ATDC = 84 degrees
Effective exhaust port Dia = 32mm
Exhaust port Dia at barrel flange = 34mm
Length from piston face to exhaust flange = 45mm

There was a link posted up in your thread to a online version of the Graham Bell book, I had a look for it, but gave up after 50 or so pages. I don't suppose you have it save somewhere?

Cheers,

-Glen

**Str8 Jacket** · 15th July 2009, 07:02

Originally Posted by koba

I imagine it may have got even worse with the KTM chamber Ola put on it, I was crying more than laughing when I rode it!

OI! HTFU! Jeebus, I loved that bike. You just needed to know how to ride it smoothly!

**Buckets4Me** · 15th July 2009, 07:37

Originally Posted by Sketchy_Racer

Hi TZ,

Y
There was a link posted up in your thread to a online version of the Graham Bell book, I had a look for it, but gave up after 50 or so pages. I don't suppose you have it save somewhere?

Cheers,

-Glen

and we wondered why he posts that link so often :P

http://www.kreidler.nl/artikelen/per...raham-bell.pdf (1st page of E.S.E tuning page)

**Buckets4Me** · 15th July 2009, 07:39

Graham Bell

http://www.kreidler.nl/artikelen/per...raham-bell.pdf

Gordon Jennings

http://www.vintagesleds.com/library/...20Handbook.pdf

http://toostroke.blogspot.com/2007/1...-handbook.html

Engine Formulas

http://members.bellatlantic.net/~vze...es/engine1.htm

Reading Plugs.

http://www.dragstuff.com/techarticle...ark-plugs.html

Rate of fuel burn and how it affects power output

http://www.factorypro.com/tech_tunin..._vs_power.html

and more

**fi5hy** · 15th July 2009, 08:47

For F**k Sake buy a Diesel and drink more beer

**Buckets4Me** · 15th July 2009, 09:20

I've seen your Diesel mechanic and it's stunts your groth

by the look of him he couldn't even buy bear :P

or is that the trick buy a diesel and get your kids to work on it ;P
no wonder your swing arm fell apart

**Buckets4Me** · 15th July 2009, 09:21

here you go

http://www.trademe.co.nz/Trade-Me-Mo...-229232177.htm
and I can drop it off to you at Taupo

**F5 Dave** · 15th July 2009, 12:36

Originally Posted by speedpro

Which leads to the skinny looking centre section. It'll be interesting to see how it shapes up on the dyno.

106mm isn't skinny, but it isn't like 115/120 one might expect on a 100. I don't think it is the volume of the pipe at all (but I know you're aware of that), that is a function of the diffuser cone angles, often 2nd is usually steepest & longest for a race pipe. A tamer pipe would have a longer 1st diffuser which by course would result in smaller center section.

Modern pipe designs on older engines don't always wash, on less curved transfers are supposed to overscavenge, the H not being too bad, but not tremendous. I might presume that with only 30deg blowdown I over cooked it on the original design pipe.

**fi5hy** · 15th July 2009, 19:48

Originally Posted by Buckets4Me

I've seen your Diesel mechanic and it's stunts your groth

by the look of him he couldn't even buy bear :P

or is that the trick buy a diesel and get your kids to work on it ;P
no wonder your swing arm fell apart

To right got to start them young

http://www.youtube.com/watch?v=9t_bmvmSCkw