ESE's works engine tuner

[Kickaha]

Of course the other way without resorting to off set pins is the top hat bush method where a offset hole is bored into crankwheel and then a bush is inerted allowing the std cranpin to be used.of course it has to be secured well and super acurate.

MY stroker crank in the GN was done that way when the capacity limit changed to 140cc, meant I could still use stock crankpins and bearings

[F5 Dave]

But sometimes there isn't the meat to support a bigger hole.

[husaberg]

But sometimes there isn't the meat to support a bigger hole.

I think i'll leave that reply open Dave

[TZ350]

Attachment 241278

Tried the V Tec, works and cleaned up the carburation.

Attachment 241277

Blue line inlet soft closes 98 ATDC Red line 88

It beats me how closing later picks up some midrange and loses overrev.

[Moooools]

Didn't you just half your power range by using the V-Tec?

[bucketracer]

Didn't you just half your power range by using the V-Tec?

Yep looks bad ...........

[TZ350]

Didn't you just half your power range by using the V-Tec?

Attachment 241287

Green line is the original setup without the V Tec with the inlet soft closing at 88 Atdc

Red line is the manualy opened V Tec with the inlet soft closing at 88 Atdc

Blue line is auto closing V Tec with the inlet soft closing at 98 Atdc

Certainly lost some power range, but I think it could be caused by the different inlet closing points.

Attachment 241286

[wobbly]

Lack of meat around the hole is almost as bad as the queer shit possibly going on in Mikes MB100.

In most race applications I have found that 88* is the best compromise.
But that over 90*the troublesome carburation effects overcome any power advantages that you would expect.
As I said in another post - rotary valve tuning is as much about timing ( usefull STA ) as it is about ameliorating the issues with tract resonance affecting the A/F ratio actually seen in the case, and thus the combustion process.
Your intake is relatively long now - thus the resonance effects are seen earlyer, and stronger.

[TZ350]

We ran Chambers Team ESE bike up on the dyno tonight with a conventional OKO 24mm carb with the power jet tube removed and got 25 rwhp.

[TZ350]

In most race applications I have found that 88* is the best compromise..........Your intake is relatively long now - thus the resonance effects are seen earlyer, and stronger.

Looks like I will have to change my inlet timing back to 88.

[kel]

We ran Chambers Team ESE bike up on the dyno tonight with a conventional OKO 24mm carb with the power jet removed and got 25 rwhp.

havent seen that one before. If Im guessing right then thats bad news for a lot us.

[kel]

How about a variable exhaust header. This one allows 25mm adjustment

Attachment 241299
Attachment 241300

Google translate says "a new control to include inflammation of RTD and the like" Thanks Google.

[koba]

We ran another GP125 Team ESE bike up on the dyno tonight with a conventional OKO 24mm carb with the power jet removed and got 25 rwhp.

havent seen that one before. If Im guessing right then thats bad news for a lot us.

Once you guys bulk up that hole a bit THAT would be a good engine to have, It looks more practically useful to me.

EDIT: Scales can be deceiving BUT I still like the look of that.

[bucketracer]

How about a variable exhaust header. This one allows 25mm adjustment

Attachment 241299
Attachment 241300

Google translate says "a new control to include inflammation of RTD and the like" Thanks Google.

That's very interesting, TeeZee has experimented with different mid sections but concluded that for it to be really useful the header would need to be adjusted too.

He has some ideas about a slippery pipe but not one with a moving cone but an elongated butterfly arrangement that starts in the belly section and tapers into the rear cone. When it swings across it effectively reduces the tuned length by shortening the mid section and also changes the angle of the convergent cone from mild to wild.

With a header that varies in length too this could be the go for a broad spread and wild top ............

[bucketracer]

I've seen pics and heard rumor of this bike

It is something Chambers built up, he wanted to show TeeZee that you don't need a fancy carb to make good hp.