ESE's works engine tuner

[seymour14]

It's not the can's of worms, it's just that the toasters can't keep up.
Maybe we need more toasters and thinkers.
Neil

Status Quo will probably be the call I expect. We already have too many things overflowing from the "too hard" basket...

[kel]

Thank god we race on small kart tracks where the skill of a rider can clearly overcome someone else's machine advantages.

The class isn't and never was solely based around kart track racing. The GP was run at Ohakea , then Taupo (and at Mt Wellington for maybe a year or two). The Tokoroa GP has only been around since 2012, and unless I'm mistaken we have had zero south islanders attend.

This would all be so painful if we raced on big tracks where small differences in HP and weight meant everything. No wonder why so many of the buckets in Christchurch are practically stock engine wise!

[mr bucketracer]

this is so cool talking buckets in the ESE thread again

[seymour14]

this is so cool talking buckets in the ESE thread again

Your a cheeky little monkey tonight...

[diesel pig]

In celebration of water cooled 100's Page 2


Attachment 319200

Yow Lings RG150 to 100 conversion, this motor may have found its way into Diesel Pigs bike.

Nope they are two different engines although a lot of my engine was make in Lings workshop including the new sleeve
I rough out the porting on his mill on last sunday afternoon casting a cylinder gets more attractive all the time

[Grumph]

Nope they are two different engines although a lot of my engine was make in Lings workshop including the new sleeve
I rough out the porting on his mill on last sunday afternoon casting a cylinder gets more attractive all the time

The RG400 barrels are already 50mm bore....still here.

[F5 Dave]

Hmm well I'll see if I can post a pic but this tablet is a piglet.

No, fail, maybe later when on a PC.

[Buddha#81:Me]

This would all be so painful if we raced on big tracks where small differences in HP and weight meant everything. No wonder why so many of the buckets in Christchurch are practically stock engine wise!

That's the best thing I've read on here for some time, infact we detune our motors to make them easier to ride...... We are still waiting for one of your mega hp rockets to come down and take the BOB north. I suppose a 14 year old on a "standard" FXR taking third place in GP for the development (old street stock) class at the first round of the nationals up against RG's KR's and ninja 250's was a fluke? Granted we might not have the peak HP that some of your bikes have but we also need some reliability to sustain the long periods of full RPM required at Ruapuna and Levels. Ask DieselPig how many Pistons his RG100 has eaten in the quest of full track glory. Stock motors bwhahaha!

[Frits Overmars]

Frits, would it be possible to post your leaning tower analogy in this thread? I've enjoyed reading it on another forum but I cannot find it here on kiwibiker.

Thanks for the flowers Bjorn. Here you go:
http://www.kiwibiker.co.nz/forums/sh...post1130452977

[nasone32]

Frits,
I am tinkering a bit on your FOS design, and I did a nice experiment you might want to look into. maybe it's garbage, maybe not.
Basically I am doing static flow simulations, and i look at the amount of flux intersecting a plane near the head, with different parameters.
Normally I am always a bit behind the coventional scavenging, But I found out that using a 25 degrees taper in the last centimeter of the transfer ducts, there is almost an 80% gain in the upward flow (towards the head). the mass flow measured at exhaust ducts is unchanged, so this proves i'm not fooling myself.

I know static simulations mean very little, but I also have an understating of the correlations yamaha found out on that sae paper, i'm using their method, and the flux reaching the head (or better, crossing a reference plane 30% of the stroke from the head) is in good correlation with the scavenging quality.
I have a grasp that the FOS scavenging quality is good only "on the pipe", so i was hoping to improve it a bit.

I'm a bit away from engines these days, i know this is mostly fried air, sorry, but i need to keep the mind active sometimes. and sharing is caring...

here's a hint on the taper i am talking about

[Niels Abildgaard]

Will it be possible to change scavenging models like ESE to handle two strokes with exhaust valves and unsymmetric timing?.
As I se it, two strokes with piston controled exhausts, is a dying breed.

[nasone32]

With enough workmanship a lot of things are possible, but the point is always the same, we want 2-strokes for simplicity, once you add mechanical complexity you might want to consider a 4 stroke. Just double the capacity and the power comes out easily. even easier than with 2 stroke
unless you cannot double the capacity, then you are in racing. And in racing there's not a big point in having a super-flat power curve (because that's the reason for exhaust valves and unsymmetric timing)

[Frits Overmars]

Frits,
I am tinkering a bit on your FOS design, and I did a nice experiment you might want to look into. maybe it's garbage, maybe not.
Basically I am doing static flow simulations, and i look at the amount of flux intersecting a plane near the head, with different parameters.
Normally I am always a bit behind the coventional scavenging, But I found out that using a 25 degrees taper in the last centimeter of the transfer ducts, there is almost an 80% gain in the upward flow (towards the head). the mass flow measured at exhaust ducts is unchanged, so this proves i'm not fooling myself.

I know static simulations mean very little, but I also have an understating of the correlations yamaha found out on that sae paper, i'm using their method, and the flux reaching the head (or better, crossing a reference plane 30% of the stroke from the head) is in good correlation with the scavenging quality.
I have a grasp that the FOS scavenging quality is good only "on the pipe", so i was hoping to improve it a bit.

I'm a bit away from engines these days, i know this is mostly fried air, sorry, but i need to keep the mind active sometimes. and sharing is caring...

here's a hint on the taper i am talking about.

Ciao Nasone, come va?
In addition to my calculations I did some flow tests too before drawing the cylinder, and your findings agree nicely with mine. Take a look; those angles are all there .
(Axial angles 25°, radial taper 22,5°)

Will it be possible to change scavenging models like ESE to handle two strokes with exhaust valves and unsymmetric timing? As I se it, two strokes with piston controled exhausts, is a dying breed.

Niels, Piston-controlled exhaust ports open with a velocity of over 1,5 times the mean piston speed. Fourstroke-type exhaust valves open with an initial velocity of zero; they cannot possibly achieve the required blowdown angle.area. And if you enlarge the bore-stroke ratio in order to accommodate bigger valves, you will lose transfer angle.area. In return your engine will become twice as complicated. Doesn't seem a difficult choice to me.

[nasone32]

That's simply fantastic to hear Frits! thank you. Fuel for my mind.

I want to share a thought with the others here, again about the ryger concept. I took a random wave pressure animation in an exhaust pipe (Vannik's great job here)


the first big pulse coming out and reflecting back is the one we already put to great use.
if you look carefully, after the exhaust port closes, there are still waves going back and forth in the exhaust.
Or better, there's a full wave cycle to be exploited there, when the piston hovers around TDC. with the lowest pressure ratio being exactly like the one we use to suck from the cylinder, and the highest pressure ratio in the 1.5 range.
As someone previously suggested, the port under the exhaust port could be connected to the exhaust port, through the "fake booster" channels in the drawing.

with the right timing there's a lot of potential to overfill the crankcase.

just my 2 cents.

[Norman]

I have seen a note at the European patent office regarding the Ryger patent from December 2007 that it was withdrawn in July 2009. Can anybody here confirm this?