ESE's works engine tuner

[katinas]

Niels, maybe another risk of unit crankcase chamber, could be detonation in overcharged one cylinder, at certain different condition.

For NS 500 3V engine, because of the higher temperature, center lower cylinder compression was reduced in comparison to vertical side cylinders.

Just remember 1991 Hans Becker modified TZ 250 DP4 engine with Hans Hummel big bore cylinders. Huge over-square 67,5 mm bore and std 50,7 mm stroke. 363 cc -91,2 hp at 10668 rpm, 20 hp over std 250 cc
Later 54.5 mm stroke crank was used with slightly smaller pistons, 375 cc.
Big surprise that this kit still available
http://www.geckomotorcycles.co.uk/ma...-bore-kit.html

[speedpro]

Attachment 350558Attachment 350559

Reminds me of a Martin Jetpack V4 crankshaft

[husaberg]

Reminds me of a Martin Jetpack V4 crankshaft

oddly i cant remember posting this stuff at all wtf

https://www.kiwibiker.co.nz/forums/s...post1131038334

No but on the link above the cylinders in the background of the link above look to be CP industries liger
Attachment 329705
http://www.cpindinc.com/pub/view_pro...=3101-9779-144
ie same crowd that does the big bore banshees as well as CR500's

Also the cases apear to have a awesome finish esp the one in the background
looks to me like diecast.
Attachment 329715
I also note the piston ring crase seal
Attachment 329706

Here is the staff for ifitech
http://iffitech.com/#staff-module
They even have one of charlies angels.
hes the guy that did this, it looks as if its been rebranded.
http://www.stuff.co.nz/motoring/5614635
http://iffitech.com/wp-content/uploa...Lawson-Web.pdf

Maybe rob should call in and visit them for a look.

---

Here is a Konig cranks


as well as the modern better made ones

[Niels Abildgaard]

It has been argued that having a two cylinder boxer two stroke will beunstable in amount of air fuel mixture distribution from an undivided crankchamber.
The Koenig won a lot of races ,was basiclly two independent air/fuel wise boxers with two cylinders each served from an undivided crank case.
Is that fact or fiction?
A picture of the rotary valve face will b very nice if someone has one.Please?
I got a monster McCullough 4 cylinder two stroke drone engine from our Navy once and I seem to remember that it was two crankchambers feed from reed valves from one common carb?

[andreas]

Well it wasn't so informative.

[husaberg]

It has been argued that having a two cylinder boxer two stroke will beunstable in amount of air fuel mixture distribution from an undivided crankchamber.
The Koenig won a lot of races ,was basiclly two independent air/fuel wise boxers with two cylinders each served from an undivided crank case.
Is that fact or fiction?
A picture of the rotary valve face will b very nice if someone has one.Please?
I got a monster McCullough 4 cylinder two stroke drone engine from our Navy once and I seem to remember that it was two crankchambers feed from reed valves from one common carb?

Hi here. its shut though LOL
.

here are some others but the one Andreas has found is the best

[katinas]

Another unit crank chamber type, copy of Konig, that was made in small series. Both with the same 54 mm stroke, but 45,3 mm bore for 348 cc. Runs on Methanol

Veterok-70 348 cc 70 hp at 9000 rpm
Veterok-100 496 cc 100 hp at 9000 rpm

[husaberg]

i cant recall who did this one.
Frits will though. it was out of some sidecar

okay

here are some pictures of the Stredor, a work of art made by Egbert STREuer and Rinus DORgelo. This machine was on display at the Speedshow in Cafe Hofsteenge in Grolloo

https://www.flickr.com/photos/teamhe...57594456814612

plus some others one reed aparently based on the yz250
no idea of the internal layout

The other I would like to replicate (as for no other reason it looks frigging cool)
I can't remember what it was called but i think it was three leter E..

[Niels Abildgaard]

Hi here. its shut though LOL
.

here are some others but the one Adereas has found is the best

Thank You for pictures.
All are common chamber for two opposed boxer cylinders (Me think)
Seem to remember that exhaust pipes was not very prominent and certainely not as big as present ones.

[Niels Abildgaard]

Another unit crank chamber type, copy of Konig, that was made in small series. Both with the same 54 mm stroke, but 45,3 mm bore for 348 cc. Runs on Methanol

Veterok-70 348 cc 70 hp at 9000 rpm
Veterok-100 496 cc 100 hp at 9000 rpm

Thank You for picture.Do You have a picture showing Exhaust arrangement?
It is I think again common crankchamber Boxer

[Niels Abildgaard]

i cant recall who did this one.
Frits will though. it was out of some sidecar

okay

https://www.flickr.com/photos/teamhe...57594456814612

plus some others one reed aparently based on the yz250
no idea of the internal layout

The other I would like to replicate (as for no other reason it looks frigging cool)
I can't remember what it was called but i think it was three leter E..

Thank You for lovely pictures of mechanical nigthmares.
Most certainely divided/rotary sealed individual crankchambers and intended for 4 full blown resonance exhaust pipes.

[Niels Abildgaard]

Boxers can have common or sealed individual crankcase chambers.
For direct exhaust they can be common

http://miniairboatassoc.com/forum/sh...1-Drone-Engine

The disappointment Andreas swedish friend had (letter 36519)was most likely trying undivided crankchambers with modern resonnance exhausts.
Modern military drone two stroke boxers do not have tuned exhausts .

[katinas]

Thank You for picture.Do You have a picture showing Exhaust arrangement?
It is I think again common crankchamber Boxer

This is the only other picture that I have of this engine.

Add other outboard racing engine picture from sixties. This is the development of soviet 1962 single-cylinder racing engine "Hurricane-175", developed on the basis of the Zimmermann disc intake engine design, a sample of which was handed over to soviet racers by its designer Daniel Zimmerman.

175 cc 60,5 x 60,5 mm bore/stroke
27 hp on pump fuel
Carb 30mm
Ex 189
Intake 198 opened 52 after BDC
Trans two mains-132 C-129
Exhaust stainless 0,5 mm

[Niels Abildgaard]

This is the only other picture that I have of this engine.

Add other outboard racing engine picture from sixties. This is the development of soviet 1962 single-cylinder racing engine "Hurricane-175", developed on the basis of the Zimmermann disc intake engine design, a sample of which was handed over to soviet racers by its designer Daniel Zimmerman.

175 cc 60,5 x 60,5 mm bore/stroke
27 hp on pump fuel
Carb 30mm
Ex 189
Intake 198 opened 52 after BDC
Trans two mains-132 C-129
Exhaust stainless 0,5 mm

Lovely and shows that Boxer exhaust pipes were not tuned by modern standard.
Do You know power and rpm of Boxer?

[katinas]

Lovely and shows that Boxer exhaust pipes were not tuned by modern standard.
Do You know power and rpm of Boxer?

Boxers Veterok 70 and Veterok 100
348 cc 70 hp at 9000 rpm
496 cc 100 hp at 9000 rpm

Guseppe Rossi made a very nice engines, its like mix of Konig boxers with Jan's type cylinders and reed valve. Looks like was tested two types for 500 cc, with pairing crank chamber and separated for all four. Paired crank chambers version crankshaft with additional outside bearing to prevent deformation. They still produce 350 cc boxer with unit crank chamber, but on 250 cc base, so its over square bore/stroke like RD 350.
Last year they won WC F 500 with Erko Abrams and F 125 with Sanna Aslav Kaasik.