ESE's works engine tuner

[DoldGuy]

TZ, I can not answer the complete curve, but know if you overlay the dyno with valve open versus valve closed, where they cross is where the valve should be open & prior to the two crossing should give you a good idea of when & how quickly to open.

[Muhr]

Been playing on the new 105.
33hp and honestiy it's the easiest /best curve
33hp i have done. Not even pushing any port numbe6rs on it yet. Only 85 degree main ex port and 90.5 subs. Runs on pump.

Now the question is why? Tried 4 pipes. One was best by far
Has a good ex tunnel. And the new tranfers make my modified tranfers look big and pathetic in shape.
Tranfer volume is extremly small. Smaller than my modified cylinders by quite a bit
I can tell it less short circuit by alot.

Maybe some of you can use the chord or % on ex to tranfers to compare. I Can tell you the stock cylinder sucks here!

Would be interesting to see the dyno sheet from the different cylinders

[TZ350]

TZ, I can not answer the complete curve, but know if you overlay the dyno with valve open versus valve closed, where they cross is where the valve should be open & prior to the two crossing should give you a good idea of when & how quickly to open.

Great. Thanks, I will try that and see what it looks like.

[wobbly]

Its easy to set up a good baseline PV curve TeeZee.
But the place to start is to have a graph point at the beginning and end of the ramp with only one intermediate point.
Having a heap of points ( so you can make a " curve " ) slows down the ramp speed considerably.
You only need one point connected by two straight lines, so this can be two different slopes , opening fast - then slower , or visa versa.
Find the full open and closed volts, and also note the physical 1/2 height of the blade ( this is rarely 1/2 way between open and closed ).
Do a run with the blade held down, one at 1/2 height ,and one fully up.
Where each curve crosses is a point on the needed ramp curve.
If the blade is too low ,then opening it sooner will give more bottom end.
But in any case no way will it need to be fully up past peak Hp - as your sample shows..
Usually around 1500 rpm below - with "normal " Ex port timing.

[F5 Dave]

Thanks I need to get the 496 RZ back on the dyno now Ignitech PV control. Still have old RZ servo. Sounds ok but surprised the mV readings are pretty close between open and closed. Guess the computer doesn't care as long as it's consistent.

[TZ350]

Still have old RZ servo. Sounds ok but surprised the mV readings are pretty close between open and closed.

It looks like mine is about 800mV. 2.1V to 2.9V yes not that big a difference, our other engine is much the same...... must be right....

[tdc211]

Would be interesting to see the dyno sheet from the different cylinders

I probably have 1000 charts over the years.
Most on old lap top

But i posted 34.5hp (my best peak)one before on here. With the old cylinder. Had epoxy tranfers. 20hp at 9000. 17.0 comp 790 pipe (520mm piston to diffuser)
117/118/119 Tranfers 82/86subs. 40hp worth of sta.
1.32 case comp = 34.5 on dyno and matched sim well at 88/89 combustion efficiency


Now i 790 pipe (560mm piston to diffuser) . 14.3 comp And specs i listed a few daya ago and With in 1hp of old set up. I am 33.4 as of now

Old cylinder. Even epoxied ,Hated 560mm p-d pipe. Seem to just want lots return pulse. Small stingers etc.

Old cylinder from ktm was 18hp at9000 and 14.5 comp .
And about 27hp. With the 11cc tranfers and shit A port hook

Those are dead honest #s from yrs of testing.

[wobbly]

If you have a small delta V then that means that the pulley ratio is wrong ( or the lever ratio actually pulling up the blade ).
You need a much bigger diameter on the PV shaft , so the servo rotates alot more.
With only a small delta and the 100mV hysteresis it will be very hard to get repeatable results.

[tdc211]

Would be interesting to see the dyno sheet from the different cylinders

Did you move A port away from main export and fill in bottom radius of main ex port in that cfd? Or is that just the transfers shape/volume?

[F5 Dave]

If you have a small delta V then that means that the pulley ratio is wrong ( or the lever ratio actually pulling up the blade ).
You need a much bigger diameter on the PV shaft , so the servo rotates alot more.
With only a small delta and the 100mV hysteresis it will be very hard to get repeatable results.

Hmm. Ok will put it on the bench and restart from scratch. I'm using presumably the same pulley as the 485 in example but readings are nearer 5v and not much delta.

[wobbly]

If its near 5V that just means the pulley position on the servo is near the end of the feedback pot.
Adjust the cables so you can move the pullet away from 5V.

[Muhr]

Those are dead honest #s from yrs of testing.

Did you move A port away from main export and fill in bottom radius of main ex port in that cfd? Or is that just the transfers shape/volume?

There is no mistrust about those numbers in any way, rather an interest in seeing how they perform over rpm. CFD I put up was a 100cc one with 150% neck (90 * from transfer port) area and the other with 200%, the same inner radius. In this case, the smaller area seems to do a better job on moving the charge towards the center of the cylinder

[SwePatrick]

When flowsimulating, are you simulating constant flow or flow with high pressure that gets lower as the piston moves further down the bore, and that actually gets below 1bar absolute at btdc?

I´d say constant flow is way off from what´s happing for real in the transfers.

[F5 Dave]

Hey, where's Adegnes our favourite Norwegian shed drinking scooter fiend these days?

[jamathi]

When flowsimulating, are you simulating constant flow or flow with high pressure that gets lower as the piston moves further down the bore, and that actually gets below 1bar absolute at btdc?

I´d say constant flow is way off from what´s happing for real in the transfers.

After years of flow testing I concluded that flow testing the transfers makes no sense.
More flow often means less power.
So we decided that power-testing was the best thing to do!