ESE's works engine tuner

[SwePatrick]

I´m looking at 3ma clutch, it got 5 springs, 1kt has 4 springs.
The clutch discs are the same between them.

Need to know if the splines is clutchcenter are the same.

[wobbly]

What dyno software is that , seems wierd to have rpm on the Y axis.
Doesnt the software have the ability to input the actual speed drop ratio from the dyno shaft ( once you have done one pull ) thus you dont need to smooth the rpm chanel and then this can
be shown on the X axis as is normal ?

[SwePatrick]

It is sportdyno 4.1
I just made this screen to show how badly the clutch slips.
Normally i just show hp and torque
but theese two screens show hp and engine rpm.
I forgot to show dynoroller speed, but it is a straight line in both runs, slightly leaning upwards to the right as the speed increases, not as the engine rpm, who just hits the roof and sits there.

I thought it was crystal clear

I can also add more filtering, but that just smoothes everything out, i wan´t to see jerks peaks and valleys.

[TZ350]

It is sportdyno 4.1 I thought it was crystal clear

Me too, unusual layout but easily readable. RPM and HP relates Ok. The slipping clutch gives the HP curve that CVT look.

[speedpro]

If you machine the steel clutch plates only reduce the thickness of the plain part that the friction plates rub on. Leave the tooth part that engages the clutch centre part full thickness so the standard thickness is engaging. Easier on the alloy bit that way.

[andreas]

There used to be stronger springs available for the 350 ypvs, possibly they will fit, the xt 600 has 5 springs as yours does.

[Muciek]

But 44hp isn't stock power or close to it?

[F5 Dave]

Actually yeah. 45 should be stock 1KT.

Might have to shell out for some new genuine Yam plates.

The old RZ ones had these silly rubber rings but FZR plates were wider, as in smaller OD so more area where rings used to be.

[Muhr]

makes sense. the transient response of the pipes is very similar as you can see in the inclination of the logged temps, I would have expected the thinner one would react faster. likely the 1 mm variant contains more energy due to the higher thermal mass, which adds energy to the exhaust gas off throttle. transient behavior is always hard to judge up front.

It's important to use the same thicknesses of thermo couples for both tests, a thinner one will react faster and lead to wrong conclusions.

Side note - I do car manifolds/exhausts for a living at a Tier 1 supplier, and have some inside about material choice/properties/behavior. Personally I'd stay away from Inconel, it's only necessary for really high temp applications like supercar manifolds to maintain some sort of strength on full load. If the welding process and penetration are not absolutely perfect you get all kind of funny failures (cold cracks, hardened weld seams,...). Just use some 1.4301, very similar thermal properties and fraction of the price.

Hi we have now done more tests even with 4301 1mm (which unfortunately was prone to cracking) what we ended up with which I consider superior in terms of the smallest possible drop in exhaust temperature is inconel or rather as thin a sheet as possible in this case 0,5mm inconel. image below from the latest test with inconel, with adjusted length for the increased average temperature and conservative jetting. Hope to be able to do some test with titanium in the future

[jfn2]

Katinas:
I was telling a friend of mine about your thinking on rounding the timing edge that we talked about some time ago, so I took his engine apart to rering it and looked what I found.
This is a YZ125 piston made by wiseco. I didn't measure it yet but it looks like 3-4 mm. It goes the whole way around the piston edge. It does not stop at the c-port area. The head does not reflect the radius of the piston. I will have to try that later on. I don't think they would have taken the time for this rounding if it didn't produce some kind of advantage, but then this is not a cheap piston either.

[SwePatrick]

But 44hp isn't stock power or close to it?

Mine is far from stock

[SwePatrick]

I´ll try this first before start throwing new parts at it(and maybe all wasted)

I have added 4 springs:

[TZ350]

.

I have added 4 springs:

That is very clever. I wish I had thought of it when I needed to beef up my own clutch.

[Brett S]

Katinas:
I was telling a friend of mine about your thinking on rounding the timing edge that we talked about some time ago, so I took his engine apart to rering it and looked what I found.
This is a YZ125 piston made by wiseco. I didn't measure it yet but it looks like 3-4 mm. It goes the whole way around the piston edge. It does not stop at the c-port area. The head does not reflect the radius of the piston. I will have to try that later on. I don't think they would have taken the time for this rounding if it didn't produce some kind of advantage, but then this is not a cheap piston either.

That first picture looks like the drilling for the anti rotation pin has hit the bottom ring land?

[Frits Overmars]

I´ll try this first before start throwing new parts at it(and maybe all wasted). I have added 4 springs:

That is quite a clever solution Patrick. But didn't the required manual force become very high?
You might try this oil; it was developed by Addinol in collaboration with Langtuning (www.langtuning.de) precisely for your kind of problems, with remarkable results (and no, I do not get a percentage ).