ESE's works engine tuner

[Frits Overmars]

...we arent too enamoured with the French (and their state sanctioned terrorist activities) here.... I didn't know about the coma thing being that widespread.

I know what you mean regarding their interpretation of external affairs. And though their wines are OK, their cuisine is grossly overrated if you ask me.
Luckily the coma thing isn't that widespread, or we would all be asleep all day long .

[ken seeber]

Northern hemisphere report #2
There is a little guy called Tony Bufalo that has created a replica Yamaha 250 V4, model RD05. Sounded great on the stand.
He made it all from pics. The major engine parts all from billet, not cast. Seemed to be combination of CNC and manual, all heavily blasted so it almost all looked like castings, even the cylinders. Took him 10 years.
Can be seen on http://www.spiritofspeed.eu/4/w-10/t...home-made.html
Not to beat around the bush, I told him that Neil could fix him up with some Ryger kits, with the possibility of a bulk discount for four units. As to the yet to be invented 24/7 conversions of the disc valve inlets, I said he’d have to ask Neil direct. Hope that’s ok Neil?

[Flettner]

Northern hemisphere report #2
There is a little guy called Tony Bufalo that has created a replica Yamaha 250 V4, model RD05. Sounded great on the stand.
He made it all from pics. The major engine parts all from billet, not cast. Seemed to be combination of CNC and manual, all heavily blasted so it almost all looked like castings, even the cylinders. Took him 10 years.
Can be seen on http://www.spiritofspeed.eu/4/w-10/t...home-made.html
Not to beat around the bush, I told him that Neil could fix him up with some Ryger kits, with the possibility of a bulk discount for four units. As to the yet to be invented 24/7 conversions of the disc valve inlets, I said he’d have to ask Neil direct. Hope that’s ok Neil?

Funny you should mention Ryger, I might have accidentaly bought some alloy plate and found a 34mm stroke fourstroke crank and some other associated parts assembled on the now extended prototype bench ready to whisk something up. Only way to know for sure is do it yourself.
Nice job of the Yamaha 250, how does it go?

[husaberg]

ryger.............................
http://www.kiwibiker.co.nz/forums/me...hp/48608-ryger

[twotempi]

You don't need to remind me, Twotempi. My original drawing had commas; I adapted it just for you guys. And may I remind you that the use of decimal commas is not a european, but a world-wide convention? But some people keep hanging on to the foot-pound-fortnight system and I was foolish enough to oblige.

Hi Frits

Did my physics in the MKS system. I thought that the comma was only european but only in every day usage. What do you guys use for scientific and mathematical subjects

Then I was "edgumicated" in the English ( Imperial ) system for engineering where everything was expressed in the most archane way possible. For example speed was "furlongs per fortnight". Don't get me started on links,chains,cables ( nothing to do with a motorcycle ) for length measurements or pecks,gills etc for volumes, or roods for area. Then we get short tons, long tons & metric tons ( tonnes ), kips for weights !!!!

You guys had it so so easy with the metric system. Interestingly the USA is by statute a metric country but only use imperial ( well- kind of ) in practice.

[Flettner]

ryger.............................
http://www.kiwibiker.co.nz/forums/me...hp/48608-ryger

Opps, better be careful what we say, our secrets might get out
I guess what I really meant was - welcome, Harry, to our Forum and hope you are likely to post here.

[lodgernz]

You guys had it so so easy with the metric system. Interestingly the USA is by statute a metric country but only use imperial ( well- kind of ) in practice.

The US has been trying to change to the metric sytem since 1893, but they cling to the furlong-hundredweight-fortnight system to stay in line with those world leaders Myanmar and Liberia who also use this wonderful system.
Hard to believe that the first country in the world to go to decimal currency is otherwise mired in such a weights and measures time-warp.
I fully expect the Trans-Pacific Partnership Agreement to mandate the use of the 16th century measurement system by all partners.

[m4r]

anybody heard of the "middle power flush", could the Ryger rely on this? except from using the crankcase and instead connecting the transfers directly to the Reed valve in BDC. Therefore the piston builds up higher to contain the connection ports. So the thick alloy plate is not only to block the transfers from the crankcase but also to compensate the increased piston height?

[Frits Overmars]

anybody heard of the "middle power flush"?

I have now. Where's me aspirin? I'm lucky enough to have a fair amount of German, without which it would have been impossible to understand this piece of Denglish.
And enough of the original lingo shimmers through to conclude that the German version was not exactly faultless either. An hour wasted; what a start of my Saturday.

[breezy]

Hi Frits

Did my physics in the MKS system. I thought that the comma was only european but only in every day usage. What do you guys use for scientific and mathematical subjects

Then I was "edgumicated" in the English ( Imperial ) system for engineering where everything was expressed in the most archane way possible. For example speed was "furlongs per fortnight". Don't get me started on links,chains,cables ( nothing to do with a motorcycle ) for length measurements or pecks,gills etc for volumes, or roods for area. Then we get short tons, long tons & metric tons ( tonnes ), kips for weights !!!!

You guys had it so so easy with the metric system. Interestingly the USA is by statute a metric country but only use imperial ( well- kind of ) in practice.

well when we" english" started the industrial revolution...

[Frits Overmars]

well when we" english" started the industrial revolution...

Which reminds me of an antiquarian's convention. One of them had brought a vase and everybody started guessing about its origin. Some suggested Greek, others proposed Mesopotamian or Etruscan, until one of them took a look under the bottom and read "Made in Birmingham". Whereupon all reacted: "That old?"

[ken seeber]

anybody heard of the "middle power flush", could the Ryger rely on this? except from using the crankcase and instead connecting the transfers directly to the Reed valve in BDC. Therefore the piston builds up higher to contain the connection ports. So the thick alloy plate is not only to block the transfers from the crankcase but also to compensate the increased piston height?

There was/is a dude in Oz called Arthur James Fahy, who was a prolific inventor. He also had a vey similar idea to this, the focus at this time was to gain more transfer port area. I believe he also made up samples for Kenny Roberts. In unsuccessfully searching for this, I came across http://www.google.com.ar/patents/WO1992003645A1?cl=en If you click on espacenet in the title block, you can get a pic to match the text. This is a variable transfer port height control, coming down from the top. As with the “middle power flush patent” here by Gleich, both these patents have lapsed, so free for all to play with. Funny that Harry didn't show any ports in the bore pic.

[richban]

A little off the current topic. Wob you might be interested, Its great making lots of power but when the clutch on the engine was designed to handle a lot less hp, it does mess with your racing. Now the 300 is making good hp the clutch is the first weak link. The MC21 dry clutch with 5 fibre's that is. What we are doing is running 2mm steels instead of the 2.9 factory steels. This should allow 6 friction plates and hopefully no more clutch slip. I am keen to try anodised ali as a replacement to the steels.

These bike are now well sorted. In the right hands they are class winning. Bring on summer.

[speedpro]

I hope you have only thinned the friction surface of the steel plates and not the fingers(?) that engage with the clutch hub. Typically you can lose a bit off the friction surface of the clutch parts that clamp the plates together. The idea being that the finished clutch assembly with the extra "pair" of plates has the exact same assembled height as the original. You need to add an extra steel and an extra fibre to make an improvement. The trick is machining everything dead true with no chattering. Not easy for a beginner on a lathe.

While you have the clutch out check the cush drive as well. If the engine is making more power at not many more revs then the torque must be greater. Go far enough and you can overpower the cush drive and if it's bad enough smash springs(if you have them) and even start to shear off the rivets that holds the assembly together.

[husaberg]

A little off the current topic. Wob you might be interested, Its great making lots of power but when the clutch on the engine was designed to handle a lot less hp, it does mess with your racing. Now the 300 is making good hp the clutch is the first weak link. The MC21 dry clutch with 5 fibre's that is. What we are doing is running 2mm steels instead of the 2.9 factory steels. This should allow 6 friction plates and hopefully no more clutch slip. I am keen to try anodised ali as a replacement to the steels.

These bike are now well sorted. In the right hands they are class winning. Bring on summer.

According to the NSR the dry clutch would have one 2mm steel on the inside an upgrade is to replace this one thin plate with a std 2.9. For more preload.
It also says EBC and JHa do upgraded springs.http://nsr-world.com/tuning/250-tuning/engine/
It looks like the Tyga kit replicates this set up.http://tyga-performance.com/site/pro...oducts_id=1178

Ps your bike looks great.