ESE's works engine tuner

[SwePatrick]

Yes. i can do the same things myself as i have the same profession.
But ABB who i work for have strict securityrules about carrying things through the gate.
If they catch you it can lead to one getting fired.
So i better let people that takes no risks, do it.
He is on facebook if you want to look at more things he has done, search for the name in the picture =)

Rgds.

[teriks]

Yes. i can do the same things myself as i have the same profession.
But ABB who i work for have strict securityrules about carrying things through the gate.
If they catch you it can lead to one getting fired.
So i better let people that takes no risks, do it.
He is on facebook if you want to look at more things he has done, search for the name in the picture =)

Rgds.

Local guy?
Looks like someone Id like to get in touch with

[SwePatrick]

He lives in 'Järfälla' Sweden Stockholm.
And he does quite a lot of work for foreign guys.

Don´t hesitate to get in touch with him, he´s a nice guy.
Very professional.

Edit: saw now you are located in Sweden.

[TZ350]

Interesting what you find in the shed when you have a clean up.

An Aprilia cylinder TF100 conversion idea for anyone who might be thinking about a F4 110 2T



The two rear cylinder studs could be through studs located in the crank case.
The two front cylinder studs to be located in the spacer plate
The front of the spacer plate would be held down to the case by cap screws
The rear of the spacer plate is held down by cap screws into the existing case stud holes.



The GP case with the original stud holes plugged with alloy rod glued and screwed into the old stud holes.
Three cylinder studs are in the case. One cylinder stud in the spacer plate and the plate itself held down with a cap screw.

[teriks]

He lives in 'Järfälla' Sweden Stockholm.
And he does quite a lot of work for foreign guys.

Don´t hesitate to get in touch with him, he´s a nice guy.
Very professional.

Edit: saw now you are located in Sweden.

Closer than you think, in Ludvika even
Already contacted him/them, good impression so far.

[TZ350]

The gear box is fixed and the new oil pump seems to be reliable. The radiator and water pump holds the temperature to 42 degrees. So a few issues seem sorted.



I have been using a short throttle body in the belief shorter the better, but it may be a mistake.



Because there is a period between 6 to 7,000 rpm of violent oscillation just before coming onto the pipe. Even cranking the power valve down to ridiculous amounts did not help.

Red line TPS
Blue line O2 sensor
Brown line Small injector
Yellow big injector
Top Green line is RPM



The violent oscillation in the inlet reminds me of the same issues I had with the plenum. And it was cured by making the inlet tract longer.

I did not expect it to be a problem with EFI, where you can squirt the fuel into the transfers at just the right time, but apparently it can be.


Not sure about where to go from here, maybe back to under piston injection. It still had problems but not so severe.

[teriks]

I have been using a short throttle body in the belief shorter the better, but it may be a mistake.

I have found the same, but then I can make the inlet ridiculously short on my small stuff without throttle.

Not sure about where to go from here, maybe back to under piston injection. It still had problems but not so severe.

Could you do a quick and dirty test lengthening the intake with a pipe fitting on the OD of the ball valve housing and see if and how it effects that region?
Cant judge if there is a simple way of fitting a pipe there from the pictures...

[Flettner]

[QUOTE=TZ350;1131040234]The gear box is fixed and the new oil pump seems to be reliable. The radiator and water pump holds the temperature to 42 degrees. So a few issues seem sorte

I have been using a short throttle body in the belief shorter the better, but it may be a mistake.
Because there is a period between 6 to 7,000 rpm of violent oscillation just before coming onto the pipe. Even cranking the power valve down to ridiculous amounts did not help.

The violent oscillation in the inlet reminds me of the same issues I had with the plenum. And it was cured by making the inlet tract longer.

I did not expect it to be a problem with EFI, where you can squirt the fuel into the transfers at just the right time, but apparently it can be.



I think you might find this is where the sliding valve housing might be useful.

[FastFred]

Could you do a quick and dirty test lengthening the intake with a pipe fitting on the OD of the ball valve housing and see if and how it effects that region?...

Something like this Norton Rotary variable inlet ......

Truly astounding.

[WilDun]

Something like this Norton Rotary variable inlet ......

As far as noise is concerned, those things would have rivalled the pre war DKW two strokes! - I had the good fortune (misfortune) to hear them up close - wasn't funny!
I didn't realise they had extendable inlet tracts.

[Frits Overmars]

Something like this Norton Rotary variable inlet ......

As far as noise is concerned, those things would have rivalled the pre war DKW two strokes! - I had the good fortune (misfortune) to hear them up close - wasn't funny!
I didn't realise they had extendable inlet tracts.

And those rotary Nortons were silenced!

While we're on the rotary subject, how is this for a lovely sound?
http://www.youtube.com/watch?v=Go3Fgd1wgic
http://www.youtube.com/watch?v=9jAngoCbOMg#t=0m8s
This Mazda 787B also had trombone inlets (at 4:48 in the first video) and an exhaust silencer, deemed necessary even by the most seasoned enthousiasts.

[Nath88]

Because there is a period between 6 to 7,000 rpm of violent oscillation just before coming onto the pipe. Even cranking the power valve down to ridiculous amounts did not help.

Red line TPS
Blue line O2 sensor
Brown line Small injector
Yellow big injector
Top Green line is RPM

Looks like you have a fair bit of lash in the drivetrain with the engine speed jumping around like that. At 15% throttle it looks like the switching between the small and big injector is causing the misfire, possibly injector settings are a bit squif and when it switches over it jumps richer or leaner. Is it just a straight RPM switchpoint with no hysteresis?
At 50% throttle it looks like it's going too rich as the revs climb and pulsewidth goes up, then stops firing, revs fall, pulsewidth drops, then it kicks on again. I think the problem is in fuel delivery not gas dynamics. Guessing it doesn't do it with the carb? Food for thought.

Also there is a big lambda delay on these things off the pipe and it always swings lean when misfiring. Is the motor on the rich limit/four stroking? Your lambda values look ok, but they can appear lean when air is short circuiting the motor. My motor has a 'rich' point between 4500-5500rpm, 50% throttle and up. I think it's the anti-resonance point of the pipe. Shows the same 12.6:1 AFR as other points but its on the verge of four stroking, heaps of blue smoke, similar to how 10.8:1 behaves (which is about the rich 4-stroking limit on mine when on the pipe). So i've tuned that area to be about 1.5 points leaner. I am yet to do a plug chop at that point to check, I'm yet to do any plug chops actually, luckily the YZ isn't too picky on mixtures.

I put some hours on my thing on the weekend, did about 150km around the city and mountains with the new fuel system. It was running a fair bit richer for the same fuel pressure, so the pressure at the injector must be more constant. Also the VE table is starting to look how I would expect, a lot more natural and smooth, apart from the weird anti-resonance peak. Maximum injector duty cycle of 80% at 9200rpm, full throttle, 145km/h uphill. It used to do 150km/h with the carb on the flat, but I haven't leaned the EFI out past peak yet. Next on the list is to get the target AFR table right to maximise power, will probably do a bunch of plug chops to see what the motor likes, maybe hit up the dyno.

[TZ350]

There is a lot to think about here, I think you are definitely on the money about what may be wrong. Very encouraging to hear about you success's with the YZ.

[husaberg]

And those rotary Nortons were silenced!

While we're on the rotary subject, how is this for a lovely sound?
http://www.youtube.com/watch?v=Go3Fgd1wgic
http://www.youtube.com/watch?v=9jAngoCbOMg#t=0m8s
This Mazda 787B also had trombone inlets (at 4:48 in the first video) and an exhaust silencer, deemed necessary even by the most seasoned enthousiasts.

Pretty sure the RC45 had a two postion intake length in later variant as well.
I was going to use the Mazda one though.n But you beat me
Toyota also used to have two stage intake length in early 4age engines (mr2 etc)
The cagiva F4 was designed to have one, not sure if it flowed through to production

f1 had them


Edit so did the R1 Never knew that
http://www.motorcycle-usa.com/photo-...y/2007-yamaha/

[Flettner]

So did my Toyota Camry