ESE's works engine tuner

[ken seeber]

Hi Ken

It is only a suggestion, since the CIK prohibits the use of electronics and makes it difficult to use the valve 24/7 by not being able to use servomotors.
A pneumatic actuation mechanism similar to the one that activates the RAVE valve could be used (it would be actuated with the pressure of the exhaust gases) and since the activation mechanism and the 24/7 valve are separated, we would need a hydraulic transmission mechanism to activate it.
It can be simpler than the mechanical cam mechanism on the crankshaft and efficient since when the carburetor is closed the engine does not drop rpm immediately.

Ceci, as Frits pointed out, the CIK is the CIK and they have their close mates.

That same Frits, quite some time ago, did make comment on the 24/7 Modena system, but can't remember if he reported on any useful gains, understandable at the time cos it was just new.

However, I'd be ever so happy to hear if it did offer usefulness. The problem then, irrespective of some snazzy gizmo one can come up with and even if it is withing the current rules, is that the CIK might immediately outlaw it, thereby wasting a lot of resources in its development and the frustration.

Seems that the only freedom left is just the CC capacity limits of the Freetech 50 and Bonneville classes.

[dtenney]

Outboard hydro classes are for the most part only restricted by bore and stroke.

[Peter1962]

Ceci, as Frits pointed out, the CIK is the CIK and they have their close mates.

That same Frits, quite some time ago, did make comment on the 24/7 Modena system, but can't remember if he reported on any useful gains, understandable at the time cos it was just new.

However, I'd be ever so happy to hear if it did offer usefulness. The problem then, irrespective of some snazzy gizmo one can come up with and even if it is withing the current rules, is that the CIK might immediately outlaw it, thereby wasting a lot of resources in its development and the frustration.

Seems that the only freedom left is just the CC capacity limits of the Freetech 50 and Bonneville classes.

If I remember correctly, Frits said that Roland Holzer found an increase in HP of about 10% . And that Roland Holzer no longer works for Modena. So probably no more news to be expected...


But... a couple of days ago wobbly said that he gets the opportunity to experiment on behalf of a KZ engine constructor on his ideas for future development on two stroke engines. (like raising the floor of the exhaust, or his specific design for cooling only the squish zone in the combustion chamber). Maybe some experiments with a 24/7 valve could be included ?

[Peter1962]

Outboard hydro classes are for the most part only restricted by bore and stroke.

Yes, but those engines can thus also use rotary discs, which are superior to reed valve systems. (proof of concept : all the world titels obtained with Jan Thiel his engines)

[Frits Overmars]

If I remember correctly, Frits said that Roland Holzer found an increase in HP of about 10% . And that Roland Holzer no longer works for Modena. So probably no more news to be expected...
But... a couple of days ago wobbly said that he gets the opportunity to experiment on behalf of a KZ engine constructor on his ideas for future development on two stroke engines. (like raising the floor of the exhaust, or his specific design for cooling only the squish zone in the combustion chamber). Maybe some experiments with a 24/7 valve could be included ?

This KZ engine constructor who is eager to get Wobbly on board, is not Modena. Or rather, Modena may be eager, as may be more than one other KZ constructor, but they are not in the picture. And anyway, no kart constructor can afford to finance experiments of which they know in advance that they won't be allowed to use the results in practice.

[ceci]

It is an injustice that they prohibit the evolution of the two stroke engine,




The information that you can find in this forum about the 24/7 valve is that it is harmed by not being able to use the "servomotor" electronics, and having to use an inertia mechanism.



It is useless, but I show you in 2D drawing the suggestion "it is always easier to understand".

[wobbly]

The CIK banned power valves and any associated actuating mechanisms in KZ, so using an inertia drive to operate a 24/7 is doomed.
Spring loaded petal plates cleverly gets around the rule , but they banned it anyway , as being clever is only allowed when its not obvious or " in your face ".
The pipe is the most worthwhile area of development , and this is what I concentrated on , but then its homologated for 3 years and everyone gets to see the dimensional cleverness.
Helps other manufacturers , but not me , as apparently Vortex cannot beat my TM R1 pipe on their engine , so they are simply stealing the design for their next years homologation.

Ports , reed petals , cooling , superfinishing , etc are free as long as the hardware " looks " like the homologation pictures.
Thus for example moving the water inlet on a cylinder from the side , to the back , is frowned upon as its not visually the same.
But if the water is run thru channels from between the crankcase/gearbox , over the mains , and up each side of the boost port , and this is shown in the papers , its legal.
Now , if it cant be seen its fine as well , except of course you have water holes thru the case deck/ cylinder face in the wrong place - bugger.

[wobbly]

To see what the results would be if using the FOS correction factor I had it put into a spreadsheet.
The issue is that when using standard air at 20*C , 50% , 1013.5mBar it shows a correction of 1.125 ie +12.5%
This may well be correct if the math has been transcribed properly ?

[Frits Overmars]

To see what the results would be if using the FOS correction factor I had it put into a spreadsheet.
The issue is that when using standard air at 20*C , 50% , 1013.5mBar it shows a correction of 1.125 ie +12.5%
This may well be correct if the math has been transcribed properly ?

For all I can see the math has been transcribed properly but apparently spreadsheets are like dyno power curves: you can't trust them unless you've forged them yourself.
Here are your version, and mine in blue.

I wonder what could possibly go wrong with this simplest of equations. Maybe your spreadsheet doesn't understand that 1^x = 1 whatever x is ?

[Vannik]

For all I can see the math has been transcribed properly but apparently spreadsheets are like dyno power curves: you can't trust them unless you've forged them yourself.
Here are your version, and mine in blue.

I wonder what could possibly go wrong with this simplest of equations. Maybe your spreadsheet doesn't understand that 1^x = 1 whatever x is ?

Is it not maybe the decimal delimiter in Excel? Depending on setup it can be either a comma (typical European) or a point (most of the rest of the world)? I have burnt my fingers a few times on this.

[wobbly]

Thanks Frits , none are so blind as those that cannot see.

[karter444]

Hi
Is there anyone in New Zealand that can successfully change the position of a piston ring locating pin ,
cheers Richard

[husaberg]

Hi
Is there anyone in New Zealand that can successfully change the position of a piston ring locating pin ,
cheers Richard

Pretty sure Rob (tz350)detailed it in here use piano wire as a search.
i watched by father do it once he did it with a brass screw or stud.

https://www.kiwibiker.co.nz/forums/s...post1130986619

I use a 1.5mm dia needle roller from a little end bearing . Material is tough and also polished so there is no fretting on the ends of the ring. Drill down from the top of the piston allowing for some interference fit (say .05mm ) so the end of the pin is 1 - 1.5mm below top of piston, then weld over the hole to prevent the pin from coming out. You may get a slight swelling of the piston diameter at the position of the pin. Dress this off carefully with a mill-cut file. With a two ring piston you will have the ring gap in the same spot for both rings but this is fine.

https://www.kiwibiker.co.nz/forums/s...post1131077307

This thread is best read backwards, that way you get to the good stuff first. Page's 500, 1000 and 1500 are worth a visit.

And there are thousands of pictures you can look through if you use the thread tools.

What went wrong, poor workmanship and the retaining tip of stainless wire I used fractured from vibration.

If I was to try again I would use the Yamaha racing TZ approach of drilling down from the top and piano wire with the tip bent over in the hole. Piano wire wont fracture like the SS did.

Attachment 334094

Emess posted a very helpful tip for searching this or any other thread.

Some old TZ pistons and someone who may or maynot be Ago

Attachment 257747Attachment 257748Attachment 257749

To replicate the TZ pistons use Piano wire sharpened on the end for the pin, Piano wire can be bent so it stays in place.

https://www.kiwibiker.co.nz/forums/s...post1130260669

When moving ring pins I simply use a small riffler file and shave down the old pin flush with the back of the groove.
You could of course use a 1mm slot drill in the mill.
The new pin is easily made from whats called piano wire, and use the Z axis hand wheel after drilling the hole 0.05mm undersize to press the wire in.
Never had a failure as I have always been moving to 6 o"clock.

Ken Seeber of course might have an idea how to do it professional like as well

[wobbly]

For those of you using SportDevices dyno software I have got them to add FOS 2Stroke Correction capability.
I wont get a chance to run an engine with differing weather until next week , but I can already see that it has a much more realistic amount of correction for values that
depart alot from Std Air than the J or SAE algorithms used previously.

Next addition I have asked for is RAD/Density Altitude to be added to the available metrics outputs , so its easy to begin constructing jet charts based on best power egt /weather data.
Simple " Air Density " is of no use for tuning , that I know of anyway.
Cheers big time Frits.

Edit - Shit it just occurred to me I should have asked permission before requesting this to be included into a commercial product - my apologies Frits.


http://sportdevices.com/sportdyno41-whats-new.php
http://sportdevices.com/download/sportdyno41.61.msi

[F5 Dave]

Interesting read thank you, things I hadn't considered, not that I'm intending on trying. Just one typo I noticed on 'liter' and I only mention it in the best intentions, I have only one language and can't imagine how it must be with spelling.

Thanks again.