ESE's works engine tuner

[philou]

Scavening cylinder 125 italkit for Aprilia 125 RS

Radial angle 0°

[wobbly]

The A port front wall is nowhere near angled back enough - it will short circuit badly with a good pipe.
Also no hook on the B port rear wall - doesn't seem very clever at all to me.

[Tim Ey]

Has anyone ever measured the pressure drop over the water circuit of a 125cc race engine? And also water flow would be interesting.
Regards Tim

[philou]

it was indicated 50 liters per minute for the rsa.

taking 1 litre/minute per cv seems relevant

the improvement in performance and adjustments allowed by the cooling, must compensate for the losses caused by the turbine of the water pump.

size the impeller and volute and a job.

[Frits Overmars]

it was indicated 50 liters per minute for the rsa.... Taking 1 litre/minute per cv seems relevant.

I seem to remember it was 60 liters per minute for the RSA. 1 liter per minute per crankshaft hp is a good rule of thumb.

[philou]

following the ignition on ignition SEM rotax 123.

the problem is that there are 2 magnets side by side passing in front of the internal sensor.

with the oscilloscope, have noted the 2 top.




ignitech sent me a specific configuration file.

the point of advance becomes completely crazy from 4000 revolutions.

with the oscilloscope, have noted that there are 2 sparks produced by the 2 magnets

[PVO]

What engine type will be donor for cylinders,pistons and conrods?

850 Rotax Etec piston/small end assembly. I intend on making my own cylinders and rods.

[husaberg]

850 Rotax Etec piston/small end assembly. I intend on making my own cylinders and rods.

May i ask why your own rods?

[Niels Abildgaard]

850 Rotax Etec piston/small end assembly. I intend on making my own cylinders and rods.

Very,very interesting that 850 Etec thing
What advantage do You expect going from stock inline to own V2?
Do You have acces to parts for rough measurements or photos?

[Javier Ruda]

Also no hook on the B port rear wall - doesn't seem very clever at all to me.

Hello wobbly, on the Rotax 122 I am widening the b-port to the rear. How should the b-port hook be like? Is it for no interfering c-port flow?

[wobbly]

The B port hooks should intersect the centerline between 1/3 and 1/2 way from the boost port face to the bore center.
With a radius in the corner around 1/2 the depth of the hook.
Depends on how the other ports are arranged.
If you take a cylinder with a hook and run a stream down the duct by holding it upside down under a water tap , you will see the exiting flow is rotated axially , this clears exhaust residuals
from a large area in front of the boost port at BDC.
The C port flow is angled steeply and is attached to the rear wall , thus its not simply a matter of the B port flow being directed away from this exiting column.

[Javier Ruda]

Thank you wobbly! Very clear, I’ll do that hook. 👍

[philou]

piston with the ring lug at the rear.
with the original piston, you will very quickly be limited

[Javier Ruda]

piston with the ring lug at the rear.
with the original piston, you will very quickly be limited

Merci philou, I remember that. The issue is that I have an oversize piston (54.25 mm) and there is no 1-ring version available.

But I already bought a standard size 2nd hand cylinder, so next time it will be 1-ring type.

[philou]

position of the ring pin in relation to the transfert port