ESE's works engine tuner

[Kickaha]

Is Team ESE bringing there 30hp GP125 down to Battle of the Buckets then?

Maybe they want to bring a bike that will last the distance instead?

[TZ350]

Maybe they want to bring a bike that will last the distance instead?

Yes true .....


I am not sure, but tell me again, just how many people did she lap before changing gear by hand became to difficult.

Anyway who cares, just getting there and enjoying the racing, the track and everyones company will be enough.

[Kickaha]

but tell me again, just how many people did she lap before changing gear by hand became to difficult.

Probably everyone who finished and beat her in the end

[Fast Eddie]

Is Team ESE bringing there 30hp GP125 down to Battle of the Buckets then?

hehe sounds mint!

are you allowed 125 2 stroke in buckets? or.. is it a 4str?

[Kickaha]

hehe sounds mint!

are you allowed 125 2 stroke in buckets? or.. is it a 4str?

4 stroke to 150cc
2 stroke air cooled 125cc
2 stroke watercooled 100cc

[husaberg]

hehe sounds mint!

are you allowed 125 2 stroke in buckets? or.. is it a 4str?

F4
125cc air cooled 24mm carb (give or take a few cc's)
100cc liquid cooled open carbs (give or take a few cc's)
As big as you can get away with foul strokes normally aspirated
and super or turbo 100 cc foul stroke or there about's

F5 50cc 2 strokes
100cc four stroke



Look at this
100cc 2 stroke twin
http://2strokebiker.blogspot.co.nz/2...rd-of-ace.html
http://www.2strokeworld.com/forum/in...topic=13707.30





Silly bugger rides it on the wrong side of the road
worth a watch alledgedly a 100 but if it really is it must be very light in the front and well undergeared
also note it wheelies past a vespa

[TZ350]

Probably everyone who finished and beat her in the end

As for 2 Strokers, I am picking that Brendan from ChCh will be the one to watch this year.

[wax]

F4
125cc air cooled 24mm carb (give or take a few cc's)
100cc liquid cooled open carbs (give or take a few cc's)
As big as you can get away with foul strokes normally aspirated
and super or turbo 100 cc foul stroke or there about's

F5 50cc 2 strokes
100cc four stroke



Look at this
100cc 2 stroke twin
http://2strokebiker.blogspot.co.nz/2...rd-of-ace.html
http://www.2strokeworld.com/forum/in...topic=13707.30





Silly bugger rides it on the wrong side of the road
worth a watch alledgedly a 100 but if it really is it must be very light in the front and well undergeared
also note it wheelies past a vespa

Its running two 94cc polini cylinders by the look of it.
So up from 1o0cc to 188cc
thats why its pulling up the front end

[husaberg]

Its running two 94cc polini cylinders by the look of it.
So up from 1o0cc to 188cc
That's why its pulling up the front end

Yeah you would think so (as do I) but the thread where it is mentioned is adamant it is only 100cc.

http://www.2strokeworld.com/forum/in...topic=13707.30
Don't think much of the routing on the exhaust though. You think it would/Should be under the seat

[wax]

The 50cc evo polini cylinder doesnt look like that.

The 94 does however

[bucketracer]

When I was a Tec at Auck Uni Eng dept in the 80's they had a Ricardo variable compression engine in the thermo lab that I used for checking the octane rating and calorific value of fuels.

There you are TeeZee the Ricardo is still there and there are other dynos there too.

Check it out .... http://www.mech.auckland.ac.nz/uoa/thermodynamics-lab

The Engine research facility is located within the Thermodynamics Laboratory of The University of Auckland and is well equipped to conduct a wide range of engine and fuels research and development.

[husaberg]

RSA vs RSW125 the diak valve position is an obvious difference Frits has also alluded to rod length and primary comp what are the other differences.
On the Pitlane thread Frits has shared the port timing for the RSA as being Exhaust 202°, A-transfers 130°, B- and C-transfers 132°
He has also shared the dimensions previously of the exhaust i also assume was the RSA.
for which i are eternally grateful.

What were the other major other differences were there, if its not to much to ask.?

I always thought the change to the rear mounted disk was to narrow the engine up but was that the only reason?

Thanks Frits for your time and your patience. I see by read another forum a lot of the questions asked can be quite repetitive.

[teriks]

I always thought the change to the rear mounted disk was to narrow the engine up but was that the only reason?

They gained power doing so, I'll try to dig up that post, will take some time though.

PS, that port layout is from a 6.6cc RC pylon racing engine, or at least the picture of the cylinder.

[teriks]

So, I might have read more into it than there was, anyway, this is the post I was thinking about.

In theory enclosed cranks are good. Jan Thiel did some experiments at Aprilia with a kart engine that had its reed valve at the front: the incoming mixture had to move against the direction of crank rotation. And although the crankcase stretched over the crank webs, reversing the direction of rotation brought another HP. So the crankshaft does have an influence.
But in practice, if you reduce the distances between crankshaft and crankcase walls to less than 1 mm, the viscous friction of the mixture between the surfaces really costs power at high rpm. And if you make the clearances so tight that lubricating oil can no longer reach the big-end and crankshaft bearings, it will also cost engines
Another negative aspect: any volume with a narrow 'entrance' between the crankshaft and crankcase surfaces acts as an hydraulic damper on the Helmholtz-resonance in the crankcase.
Aprilia has avoided this by making the space between the crank webs as wide as the big-end bearing. As a result the crankcase volume of the 125 cc RSA engine at TDC is about 650 cc, so the exhaust pipe really has some volume to breathe from.
So much for the fairy tale of high crankcase compression

There might be more on this subject over there, will look around a bit more, if I find more I'll add it to this post.

[wobbly]

Jan stated that they had flow bench tested the RSW setup, and the rod moving past the inlet port had a big detrimental effect.
That prompted the beginnings of the RSA project at Derbi.
Having the carb hanging off the side of the RSW wasnt an issue as far as I know, it was enclosed in an air box, and it has been reported that
due to the required engine position change ( forced by the front pipe exit ) the RSW had better front end feedback than the RSA ,from more forward
weight bias.
Thus though the engine was quicker, alot of riders preferred the RSWs handling.