ESE's works engine tuner

[JanBros]

just finished going through a pile of Moto73 magazines ('76-'82) for which Frits used to write.

do you know if this engine ever ran Frits ?



2 "buckets" from the sixties :

Jan Thiel in action


very first Jamathi, but called Tansini at the time (1964) :

[Flettner]

why not use a 6sp set from a 125 or the ktm250 ?

Cases are already designed and cast around the YZ gearbox. No real problem as I have another YZ gearbox in the 360 engine I'm building but I just didn't want to take it apart. Just If I find another one I'll grab it, must be 2002 onwards (I think).

[Frits Overmars]

just finished going through a pile of Moto73 magazines ('76-'82) for which Frits used to write.Do you know if this engine ever ran Frits ?

Not to my knowledge. I must say this took me back quite some time. Which year of publication was this Jan?

[JanBros]

Not to my knowledge. I must say this took me back quite some time. Which year of publication was this Jan?

I didn't take note of this. I went through all of the ones I have and just kept some aside I wanted to scan. putted them all back in a box and on my attic today
but I thinck '78-'79.

[WilDun]

just finished going through a pile of Moto73 magazines ('76-'82) for which Frits used to write.
do you know if this engine ever ran Frits ?

Must say I find that one very interesting indeed, but unfortunately I didn't learn Dutch at school. However I have got the 'gist' of it all and although it would have to go through a lot of development I reckon it could be a runner. Whether or not it would make it as being a viable alternative I'm not so sure! - hope someone will have a description in English somewhere.

It would have been a good contribution on the 'oddball engines' thread (but that thread more or less got wrecked). On there, I posted the Karol Ansdale motor which in many ways is similar.
The difference here is the cylindrical outer housing in which the ring has to be shaped and can not rotate, as opposed to the spherical shape on the Karol Ansdale engine having a more normal sealing ring which can rotate. The 'scotch yoke" arrangement in this one is of course different.

I think that there was a guy who built a motor similar to this one here in Auckland (Mount Wellington) about 20 years ago.

[husaberg]

Cases are already designed and cast around the YZ gearbox. No real problem as I have another YZ gearbox in the 360 engine I'm building but I just didn't want to take it apart. Just If I find another one I'll grab it, must be 2002 onwards (I think).

This is what I found along with the other stuff re the yzf450 stuff I posted in the other thread Neil
http://www.oem-cycle.com/YAMAHAYZ250BIKEID.shtml

OEM cycles has a very good cross reference for what fits what witht the different years of all sorts of makes models and years of MX bikes

http://www.thumpertalk.com/topic/927...-ratios/page-2

[Frits Overmars]

It would have been a good contribution on the 'oddball engines' thread (but that thread more or less got wrecked).

Wrecked by someone who apparently made a bo-bo in his nappies, you mean? I still take an almost daily peek there hoping to find more wonderful contraptions:
http://www.kiwibiker.co.nz/forums/sh...otypes/page607

[tjbw]

Must say I find that one very interesting indeed, but unfortunately I didn't learn Dutch at school. However I have got the 'gist' of it all and although it would have to go through a lot of development I reckon it could be a runner. Whether or not it would make it as being a viable alternative I'm not so sure! - hope someone will have a description in English somewhere.

It would have been a good contribution on the 'oddball engines' thread (but that thread more or less got wrecked). On there, I posted the Karol Ansdale motor which in many ways is similar.
The difference here is the cylindrical outer housing in which the ring has to be shaped and can not rotate, as opposed to the spherical shape on the Karol Ansdale engine having a more normal sealing ring which can rotate. The 'scotch yoke" arrangement in this one is of course different.

I think that there was a guy who built a motor similar to this one here in Auckland (Mount Wellington) about 20 years ago.

I thought at first that the internals were a bit similar to a Bourke auto ignition/detonation engine, https://en.wikipedia.org/wiki/Bourke_engine

Then I realised that it's a rotating uniflow engine with rotary exhaust!

[WilDun]

I thought at first that the internals were a bit similar to a Bourke auto ignition/detonation engine, https://en.wikipedia.org/wiki/Bourke_engine

Then I realised that it's a rotating uniflow engine with rotary exhaust!

Yes, I would be a bit worried about the amount of ring drag on the outer casing (not like the Ryger - no ring drag!)

[WilDun]

Wrecked by someone who apparently made a bo-bo in his nappies, you mean? I still take an almost daily peek there hoping to find more wonderful contraptions:
http://www.kiwibiker.co.nz/forums/sh...otypes/page607

Yes, a very lonely man I think, if he stopped arguing about everything he might actually be a nice guy! The old scenario of people who like to wreck kid's sandcastles comes to mind!

But ........ one day maybe it will restart - then again is there anything old which still can be resurrected here? - in this forum, is there anything new under the sun, who knows!

[tjbw]

Yes, I would be a bit worried about the amount of ring drag on the outer casing (not like the Ryger - no ring drag!)

Would be interesting to see it compares with a similar engine that didn't rotate, but had a rotary exhaust valve, assuming someone could make a rotary valve that works well.

[ken seeber]

Yes, a very lonely man I think, if he stopped arguing about everything he might actually be a nice guy! The old scenario of people who like to wreck kid's sandcastles comes to mind!

But ........ one day maybe it will restart - then again is there anything old which still can be resurrected here? - in this forum, is there anything new under the sun, who knows!

Willy, I just chucked something on Oddball to maybe see if it can get going again.

[peewee]

hey frits and wobbly i was trying to think what the purpose of boyesen ports is. to add inlet area but it seems like they should have a downward angle somewhere about 45*, which wouldnt be to sharp as to cause the air to hit a brick wall and go straight down . the reason i think this is because they would be responsible for filling the lowest portion of the case and the main inlet would mostly go straight in and fill up the cylinder middle section. does any of this sound like what actually happens ?

[TZ350]

.
This quote links back to the back story so far.

Many thanks to Kickaha for the GN clutch.

Attachment 316505

Honda copy Monkey Bike primary gears are straight cuts which have the same C/C distance as the GP.

Another step on the way to building the Suzuki GP/NSR110 super Frankenstein engine, the crankshaft.

t

The GP/NSR110 crank parts.



Old balance holes plugged with alloy and a Mallory slug opposite the big end. 22mm diameter 60mm long big end pin from a diesel, 115mm RD400 rod, RGV250 big end bearing and small hardened thrust washers. I made the bigger thrust washers out of material that is tough as shark shit.



0.8mm side clearance. The flywheels are champhered to allow the wind to flow over the inner edges so the air mass can resonate into and out of the center section with less disruption, (hopefully).



50% balance factor. The balancing was achieved by skimming the inside faces of the crank, removed 2mm each side. Plenty of crankcase volume with this baby.

Back in the 80's a friend once fitted an RD350 crank into a set of RD400 cases, lots of extra case volume with the smaller 350 flywheels. I predicted it wouldn't work, not enough crank case compression, not the done thing etc. etc.... but it worked like a charm.

[Frits Overmars]

Back in the 80's a friend once fitted an RD350 crank into a set of RD400 cases, lots of extra case volume with the smaller 350 flywheels. I predicted it wouldn't work, not enough crank case compression, not the done thing etc. etc.... but it worked like a charm.

We did the same in the 80's: built TZ250 and TZ350 engines with RD400 cases and big (for the era) carbs: 38 mm for the 250; 40 mm for the 350 (because I couldn't find bigger ones).