ESE's works engine tuner

[jasonu]

Change of lean needle jet should have resolved that. If he can race next GP my money would still be on him.

My guess was the cylinder liner ex bridge pinched up

[Henk]

Nigel has been at the last couple of Mt Welly practice days. Short guy with a seriously fast 100. He's the "fast two stroke" that goes past in Javawockys first video from the May meeting.

[ac3_snow]

Nigel has been at the last couple of Mt Welly practice days. Short guy with a seriously fast 100. He's the "fast two stroke" that goes past in Javawockys first video from the May meeting.

Ahh righto I had been checking out Damian's pictures and spotting a heap of people there on the Saturdays that I haven't seen on a Sunday.
I plan to actually be there this Saturday so will see for myself.

[ajturbo]

would any of you guys know what the timing should be for the GT125 twin?

or how i would find out?

thanks..err wont be here this weekend ..

AJ

[diesel pig]

would any of you guys know what the timing should be for the GT125 twin?

or how i would find out?

thanks..err wont be here this weekend ..

AJ

22 degrees BTDC or 1.93mm with the dial gauge

[wobbly]

Na, the tuning issue with the RGV100 was twofold for Nigel, the needle and tube were always too lean, and it would sieze when backing off for the downchange.
And having been run for 3 years untouched, the bridge had worn way past the spec.
Its now got a tube that works, and has had the iron bore plated, so the wear issue has gone as well.

[goose8]

I have beaten Nigel in 4 or 5 points racers at mt Wellington with only 17hp an a 30 year old frame not to hard to beat that bike but at taupo 10 extra hp an a grand prix frame not so easy.

[bucketracer]

As I see it, at Mt Welly, easier to ride is the FXR's big advantage and outright big 2-stroke hp is no advantage at all.

So our efforts with the V Tec and power range is all aimed at making an easy to ride stroker that can be turned on earlier in the corners.

I have beaten Nigel in 4 or 5 points racers at mt Wellington with only 17hp an a 30 year old frame not to hard to beat that bike but at taupo 10 extra hp an a grand prix frame not so easy.

Looks like goose8's experience is pretty much in line with TeeZees assertion that outright hp is not that much help at Mt Welly and that easy to ride power delivery may be a good thing to aim for on Mt Wellys tight track.

A good rider and easy to ride bike are hard to beat there..............

[ajturbo]

22 degrees BTDC or 1.93mm with the dial gauge

Thanks so much..

[Buckets4Me]

I would like to meet this mysterious Nigel fellow. lets hope we can have GP this year, theres alot of people would like to put faces to.

ha ha hope you like grass or tyre wall there is a reason he is called nomates

but what a show. cant count the number of times he has pased me on the grass with the throttle peged open

[speedpro]

Nigel's bike has a very nice spread of power. Don't be fooled by the peak power it makes tricking you into thinking it is a peaky monster.

[husaberg]

Re the intake tuning idea of taking the pipe off - bullshit, the pipe affects the case pressure ratio, and this working with the intake length creates a tuned system.
I post again the graph of a 125 shifter engine,only change was the intake length, less 20mm, why fuck around when you get this easily seen result - 2 free Hp.

Don’t be mean wobbly you will hurt my feelings.

This below was plagiarised from Design and Tuning for motocross interesting would be a good starting point still relevant aplogies if it has been covered already up to pg 70 now.
Could be a logical baseline to start testing from as most race are won on the track anyway.

Tuning of the inlet track is best resonance frequency is best done by a running test of the engine, altering the induction tract length between the intake port at the piston and the carburetor .The easies way to modify intake tract length is with a spacer blocks of different thickness es positioned between the reed valve assembly and the cylinder.

On engines without a reed valve. Induction length is critical; and carburetor manifolds of different length, positioning the carburetor closer or further away from the cylinder should be tried.
In order for the exhaust system not to effect testing of the intake tract resonance, The expansion chamber should be removed and replaced with just a short piece of header pipe, Long enough to prevent sucking of air into the exhaust port, Yet, not so long as to produce a tuning effect of its own. On 125cc engines this should be 3.5 inches long measured from the Exhaust port 4.0 inches 250cc and 4.5 inches for an 500cc bike.Testing results will probably be a compromise between of two findings concerning the inlet tract length .First, which provides the smoothest power .and the second which provides the quickest acceleration between to points measured by an observer.
For the acceleration runs, Try a rolling start from the same RPM each time and use a high gear to avoid shifting between the timed points. In most applications for High rpm a short tract works best while lower rpms and wider powerbands calls for a longer intake track length


I wish I had scaned it I type like sheit

The post did not say to run without a pipe just a neutral length one .
The theory is to eliminate to pipes effects so as to find the true best intake length no one denies the pipes effect on the intake this test is only to separate them before trialing the expansion chamber.
Note not everyone as access to a dyno.
Have you tried the idea?

Don’t find Fault find a remedy Henry Ford

He to had a couple of crazy bullshit ideas to weird thing is most people only remember his one great one aye?

Do you keeep in touch with Bud Askland I am guessing you would have worked with him Woobly?

Below is another of Jim Gianatsis other bullshit Ideas I am not kidding its the same bloke who had both ideas!

[B]Whats your opinion on theone on the right I think maybe if I added a few inches I would be able finish before her.

[wobbly]

In a discussion with Thiel he said he tried an RSW with no pipe ( no expansion chamber) it took days to get the ignition curve and the jetting to work at all,cant remember what the power was ( 20% I think).
So you have an engine that makes 12Hp at 8000 rpm and that is supposed to help you ascertain the correct intake length for an engine that makes 55 at 12800 - Puleeeease.
It would be like taking the tits off the girls to see if you still got it up.( Max the Emperor would)

I worked with Bud when making pipes for several teams, and spent ages in his dyno/container office.Very clever guy that was using a 3D - CNC anemometric flow visualiser on cylinders before anyone knew what they were.
He offered his services to Bill for 1Mill to design the BSL cylinder,I got the job for only a little less.
I have keep in contact with his brother, who was the Roberts crew chief.

Re Nigel getting beaten, im sorry, for some reason I wasnt told about that suicidal nightmare.
He has just told me that in his efforts to stop the mystery siezing he had cut the com from 16:1 to around 14:1 and retarded the timing heaps, so it would be lucky to make 20Hp.
Now all that is solved he is going for an Ignitech and dead straight intake with powerjet carb.
Be over 30 easily, once the head is redone.

[F5 Dave]

Looks like goose8's experience is pretty much in line with TeeZees assertion that outright hp is not that much help at Mt Welly and that easy to ride power delivery may be a good thing to aim for on Mt Wellys tight track.

A good rider and easy to ride bike are hard to beat there..............

I don't think that backs the theory directly at all. That says that a good rider is paramount.

Also no one rides or has their best day every day they go out.

When I last rode Nige's bike it was running pretty averagely, & seat of pants I would have said 18hp. He took it home, found some issue (can't remember) & won the GP the next day. I saw the race & he rode clean & well. But the bike looked fast.

[TZ350]

Chambers sent me this link for those that might want to find a suitable rod, and I think they will even make you one to order.
http://www.samarin.net/?productos