ESE's works engine tuner

[Larry Wiechman]

Ken's photo reminds me of the early McCulloch kart engines that had a boost port duct that bypassed the reed plate. People were quick to remove the divider wall so all ports were fed by reeds, only. This was in the age of box mufflers and crappy pipe designs. Maybe a late opening C port and an effective pipe could be made to work.

[peewee]

Philou,
The pins we use are around 8 long and dia 1.55. They have a taper on one end and also have a longitudinal slot to prevent any hydraulicing ?(from say coolant) when bring pressed in. We drill the piston with a 1.5 drill, giving a 0.05 interference. The actual force to press the pin in, at a guess, is around 800 - 1000 N.

Attachment 316705

if the pin was installed from the top down with weld over the top i wonder if a press fit would even be necesarry ?

[Dutch Fisher]

My belief is that the Ryger is using "direct transfer technology", ie some of the 11 transfers allow direct passage of flow from the inlet straight into the cylinder without having to go thru any connecting volume.

Wob, you wanna put some meat on the bones of that sysopsis

[Frits Overmars]

Usually good rulebooks also include *and anything may be deemed legal and or unlegal by sanctioning body at any time.

You call that good?? It means you can as well throw the book away because in case of a difference of opinion you will have nothing to fall back on.
It's the same with remarks like "This is not within the spirit of the rules". Damn the spirit; something is either written down or it isn't.
It is the responsibility of the rulemaker to make and keep the rulebook simple and unambiguous.

[jonny quest]

No I don't call it good.

It's their way of giving up and giving themselves a loop hole.

[jonny quest]

So which forum member was closest on Ryger design?

[Frits Overmars]

So which forum member was closest on Ryger design?

Hold your horses Jonny. I can't answer that question until the new patent has been made public. But by then you can decide for yourself.
(I do have a fairly short shortlist ).

[jonny quest]

Eh, you're to smart for your our own good.

Take the bait!

[tjbw]

You call that good?? It means you can as well throw the book away because in case of a difference of opinion you will have nothing to fall back on.
It's the same with remarks like "This is not within the spirit of the rules". Damn the spirit; something is either written down or it isn't.
It is the responsibility of the rulemaker to make and keep the rulebook simple and unambiguous.

Or it's not worth the paper it's not written on

[seattle smitty]

I've been formulating technical regulations for various types of motor sport during the last couple of decades, but before that I practiced reading between the rulebook lines all my life. And the CIK karting technical regulations are a joy.
Small example: in some classes it is not allowed to add ports to the cylinder. So what are ports? Let me take you on a wonderful trip through the rulebook....Suppose I add two auxiliary exhaust channels with rectangular cross sections. Since they are neither cylindrical nor cylindrical-conical, they do not qualify as ducts.
So their intersections with the periphery of the cylinder do not qualify as ports either.
Don't you love it?

Outbaord racing would love to have you, Frits.

Rules: displacement, un-blown, any liquid fuel. Home-made engines legal and greeted with enthusiasm by the members.

(EDIT) Oops, no nitro in European racing.

[2005bully]

If that mystery lump on the barrel is some kind of pressure bleed port from the exhaust, and looking at what you've both posted, could we be looking at some form of pressure wave compressor ? Comprex comes to mind as an example vaguely similar in function. IMO, very little primary compression is needed at cranking speed to fire things up, just get a little vapour in there...
But of course, I'd think a form of pressure wave compression would fall down on the no supercharging clause.

Grumph...In all normal 2 strokes the movement of gasses is initiated by mechanical means, but as the movement of these gasses continue, it becomes assisted by non mechanical means. With that in mind wouldn't the normal 2 stroke definition of supercharging need to involve an additional mechanical method of pumping. If simply pressure or wave energy is robbed from the power stroke (or exhaust) it would seem hard to label it as supercharging. The concept uses the same basic principles as a normal 2 stroke, it just uses a different method of application.. Kermit Buller

[philou]

Philou,
The pins we use are around 8 long and dia 1.55. They have a taper on one end and also have a longitudinal slot to prevent any hydraulicing ?(from say coolant) when bring pressed in. We drill the piston with a 1.5 drill, giving a 0.05 interference. The actual force to press the pin in, at a guess, is around 800 - 1000 N.

Attachment 316705

A very big thanks Ken

[Grumph]

Grumph...In all normal 2 strokes the movement of gasses is initiated by mechanical means, but as the movement of these gasses continue, it becomes assisted by non mechanical means. With that in mind wouldn't the normal 2 stroke definition of supercharging need to involve an additional mechanical method of pumping. If simply pressure or wave energy is robbed from the power stroke (or exhaust) it would seem hard to label it as supercharging. The concept uses the same basic principles as a normal 2 stroke, it just uses a different method of application.. Kermit Buller

While the movement of a piston is a mechanical means, the gas moves due to the pressure differential thus created. I think it's well proven that the depression created when the exhaust opens has more to do with drawing the charge in than any positive displacement from the descending piston.
To adress the labelling of a supercharging function...As I understand it, the rules prohibit any additional supercharging device. This is very probably a way around the long perceived "internal compression" of the "orthodox" 2 stroke. From what I've read, post WW2 the 2 stroke was only allowed to remain legal despite the apparent supercharge because no one thought it would ever be competitive...
As Frits has pointed out, drafting rules is a minefield. Been there for years here in NZ, large portions of the MNZ rulebook still have my fingerprints on them...The fact that they're largely unchanged merely says to me I got lucky. A continuing hobby is submitting remits tidying up bad rules, lol.

[Dutch Fisher]

Here's the FIA F3 Tech rules definition on supercharging from 2013. A somewhat more comprehensive volume of regs.

1.11 Supercharging:
Increasing the weight of the charge of the fuel/air mixture in the combustion chamber (over the weight
induced by normal atmospheric pressure, ram effect and dynamic effects in the intake and/or exhaust
system) by any means whatsoever. The injection of fuel under pressure is not considered to be
supercharging.


If that was dropped into todays CIK-FIA KZ2 regs, all current homologated engines would pass

[jasonu]

It's the same with remarks like "This is not within the spirit of the rules". Damn the spirit; .

Well that's Bucket racing fucked.

What about this gem that was uttered by a then MNZ official-
'Bucket Racing is a self policing class'....