ESE's works engine tuner

[richban]

33 degrees is 5.45mm with a 105mm rod so your maths is a bit off because near tdc you get lots of degrees and fuck all mm, its not a simple 180/54 job

here is a calculator http://www.dansmc.com/mc_software2.htm

Opps............. Cheers ears.

[Bert]

Opps............. Cheers ears.

Double opps. Sorry Richard.

So use to using my buzzetti tool and the maths over the phone failed me...

[richban]

Double opps. Sorry Richard.

So use to using my buzzetti tool and the maths over the phone failed me...

All good done me some learning. Bugger though means I have to pull the head off again.

[TZ350]

Chambers, Fastfred and I got to play with a 50 on the dyno tonight.



Chocolate Fish if you can match the pipes to their dyno curves.



All this suspension talk is exciting now that I am making progress on the new bike.



All adjustable suspension and blinged out with freshly painted wheels and even hollow weight saving sprocket bolts.

[TZ350]

YSS have a booklet free for download. It's for beginners but explains a lot. Everyone should have it handy.

Great, found it (I think):- http://www.yssusa.com/suspension_problems.html Thanks.

[Bert]

Chambers and I got to play with a 50 on the dyno tonight.

Chocolate Fish if you can match the pipes to their dyno....
.....s.

I'll try for a chocolate fish.

Blue run second from top
Red run third from top
Dark blue run - bottom
Purple run - third from top
Green run - top

But chances are I'm not catching...

[dark art]

Chambers and I got to play with a 50 on the dyno tonight.



Chocolate Fish if you can match the pipes to their dyno curves.

colors in order on the graph and 1st pipe top.

blue - 5º
red - 1º
dark blue - 3º
purple - 6º
green - 4º

2º pipe the curve is not there.

[Drew]

Great, found it (I think):- http://www.yssusa.com/suspension_problems.html Thanks.

That looks quite good. Dunno where I got YSS from, Robert Taylor has also done one for racers. KSS is what I meant, but full credit for finding that.

[wobbly]

So you optimised the fuelling and the timing for each pipe ?
Would seem impossible for the same ignition to work on a pipe that peaks at 10500 and another that peaks at 13500, and I bet all the stingers were different
so would have wildly varying egts as well.
But what do I know.

[wobbly]

Here is the sideways slot on a TM125KZ10B

[FastFred]

So you optimized the fuelling and the timing for each pipe ?

Yeer, hours spent changing jets and adjusting the ignition ....... nar, it was a few bears and a bit of after work fun...

What we can say for sure is:- the best sounding one was the second to worst performing pipe.

[husaberg]

Here is the sideways slot on a TM125KZ10B

If you don't mind me asking do you have a pic of the intake tunnel, its a front intake isn't it?(I'm not a kart guy)
they run backwards though i guess?

[wobbly]

Here is the front tunnel.
The crank spins forward as normal, so the ramps over the crank shield the intake flow from the turbulent boundary around the wheels.
The rear slot lets "flow" from around the crank up under the piston.
Mr Thiel tried the shields on the Aprilia and found some power as well, but dont know if the sideways slot was tested at the time.

[Frits Overmars]

The crank spins forward as normal, so the ramps over the crank shield the intake flow from the turbulent boundary around the wheels.....Mr Thiel tried the shields on the Aprilia and found some power as well, but dont know if the sideways slot was tested at the time.

At the time Jan was thinking about the RSA inlet disk position and he wanted to find out whether the direction of crankshaft rotation had much influence on the inlet flow. So he put a standard kart engine on the test bench, measured the power, started it in reverse and measured the power again. 'Reverse' , meaning the crank rotating backward, gave one extra horse.
I discussed this with Roland Holzner of Modena Engines the other day and he told me that they'd already performed the same test at Rotax. Roland said that the negative effect wasn't so much due the counter-flow induced by the crank webs, but mainly due to the fact that the fat end of the con rod was directly in front of the reed case at the moment of initial inlet flow.

[husaberg]

I mused a while back about a combo of the Swiss Auto V4 mixed with JBB.


I can't come to grips though how much the flapping around of the unsupported crank might cost in hp.
but I tried to get my head around if the outer piston ring seal might offer support or more likely just make it bind.
I even tried to picture an outer bearing outside the crankwheel.........
I just love the way the swissauto is so compact in width.
I also know Honda did at least design if not build something very similar a little earlier.

I found this engine a flying web rotax based v twin.