ESE's works engine tuner

[F5 Dave]

Thing about a racebike is that you don't want to build it only once so replacement are ideally, have a set on the shelf and know that they can be replaced.

100cc bucket was a drama. YZ100 piston circa 1978 were kinda ok. . . Ish.
But only available NOS from random Ebay suppliers in 1 qty.

I grew sick of the increasing risk and went to Kart piston. Of course that means destroking the crank and a oversquare engine.
Convenience trumped design. It had to.

[husaberg]

Yea OK Husa I will very politely ask if they will do some with a 6 o'clock pin , but they havnt even bothered to reply to my pin position request after a week.

That whole ring pin scenario is a personal sore point , as when I pointed out to a reply on a forum , where some " idiot " replied that no way can you put a pin over the boost port , as the ends would immediately " catch "
I got blocked for saying he was a moron as its been done since the middle of last century by every manufacturer ( except TKRJ ) with no issues at all.

Re the pipe dimensions for the YPVS - not my intellectual property , so I have asked for the customers permission to publish.

Try prox they have an order frrm they do center pinned KTM200 in suitable sizes but not sure in the center pined are single ring.
We have a Japanese interpreter available on ESE as well.
https://www.pro-x.com/wp-content/upl...NICAL-2023.pdf

[wobbly]

Husa ,I researched the KTM from PROX the 01.6249 and it says the ring pins are 1.75mm off the center , so two ring , but almost over each other.
Unless I simply leave the second ring out.
Looks like the Meteor TZ350 is the go atm , unless TKRJ decide to reply at all.

Re the YPVS pipe design , the customer is not keen on me publishing it at all , so end of.
But here is the TZ250 - 3XV latest iteration , thats being fitted to the bike as we speak.
The designs are very similar , with the Wobbly duct generating 0.8 Mach and the concave rear cone setup at about the same diameter , but this has peak Hp at 12750 , the RZ350 is at 10750.
The TL is 965mm but I didnt tell you that.

[husaberg]

Husa ,I researched the KTM from PROX the 01.6249 and it says the ring pins are 1.75mm off the center , so two ring , but almost over each other.
Unless I simply leave the second ring out.
Looks like the Meteor TZ350 is the go atm , unless TKRJ decide to reply at all.

Re the YPVS pipe design , the customer is not keen on me publishing it at all , so end of.
But here is the TZ250 - 3XV latest iteration , thats being fitted to the bike as we speak.
The designs are very similar , with the Wobbly duct generating 0.8 Mach and the concave rear cone setup at about the same diameter , but this has peak Hp at 12750 , the RZ350 is at 10750.
The TL is 965mm but I didnt tell you that.

Sorry I was looking at some others that were single ring for KTM200 then looking at the 66mm 250 ones and got a bit confused as some of those are prox single rings.
here is a single ring pined in the rear at least in the pic
https://www.amazon.com/Namura-Top-En.../dp/B00T6JKANS

[Tim Ey]

Regarding 64mm Pistons:
I got some made at Wössner for a special Vespa cylinder.



The current batch is sold out, but I will probably order another batch this year.
BR Tim

[crbbt]

I am looking for some guidance for what to use for a stand alone det detector.

Googling det detector brings up a bunch of HRC models which don't seem to be available any more.

but searching for knock detector instead brings many 4 stroke solutions.

are the Link products good?

thanks

[wobbly]

I have used this on my dyno for over 10 years and sold dozens to customers - works perfectly

https://www.ebay.com/itm/11617450300...1071f2124381e9

[SwePatrick]

Started a new little project, so i´m presenting it here with a little shoutout as i am searching a head for this engine. (SGM Maranello GA207)
Anyone got one lying around to no use?


So how can i destroy this the fastest easiest way without using violence? =)

[crbbt]

Thanks Wob!

[Frits Overmars]

..........

[Wos]

Dear Jan, Dear Mentor :

Happy Birthday to You !!

[Niels Abildgaard]

Some help needed for this gentleman I think.
If it has been linked before here I have missed it

https://research.chalmers.se/publica...4_Fulltext.pdf

[Vannik]

Some help needed for this gentleman I think.
If it has been linked before here I have missed it

https://research.chalmers.se/publica...4_Fulltext.pdf

As of Saturday he is now Dr Lennarth Zander. He also published a book on engine simulations a few years ago, do a search on "Boostbusters".

[wobbly]

So we now have a proven 50Kw turbocharged 125cc 2T engine = 67 Hp.

Im so happy he did not destroy the whole project by claiming it would rev to 30,000 rpm - if you are reading this Luc , note well.

Also the complete dismissal of a supercharged system , with verifiable logic as to its unsuitability , is something I tried to convince Two Stroke Stuffing of 3 years ago.

[Niels Abildgaard]

So we now have a proven 50Kw turbocharged 125cc 2T engine = 67 Hp.

Im so happy he did not destroy the whole project by claiming it would rev to 30,000 rpm - if you are reading this Luc , note well.

Also the complete dismissal of a supercharged system , with verifiable logic as to its unsuitability , is something I tried to convince Two Stroke Stuffing of 3 years ago.

I am not sure it was claimed that the 125 thing would do 500 rps,
but that ignition system could?.