ESE's works engine tuner

[kel]

He said that the opening wasn’t critical between 140 and 145, the closing between 85 and 88 depending upon the rider and track.

He said they tried opening timings all the way to 155*, but 142 to 145 was the norm.

Attachment 232958

Is it just my eye or did they forget to tell the other teams?

[wobbly]

That pic is cited by Frits as "a radical example".
My opinion of closing angle (the important number) is that the later RSA has a much narrower port width than the RSW, and thus these timings give
a much increased STA, as the disc is covering the port for less time, with the same actual timings.
Thus maybe that engine can deliver better performance within an envelope of non "radical" port timing numbers.
In the old Rotax tandem twin, going from 85* ( stock) to 88* is like night and day in overev performance, but carburation becomes finicky and alot of bottom end power is lost.

[TZ350]

Av doing the data capture while Keith runs up her 09 Honda RS on the dyno.

http://www.youtube.com/watch?v=2fTE6AfPbUg

[TZ350]

Who knows if it's a good idea or even practical, but some time I am going to try an intercooler to see if we can chill the induction air.

[F5 Dave]

you could just move to Waiouru

[TZ350]

Some unkind person .... .....pointed out today, they had done the math and that when Av rides his 22hp bucket I would need 55hp to have the same power to weight ratio as her.

No wonder her bike zips out of the corners so fast.......... and I burn clutches.

[Henk]

So go on a diet

[TZ350]

So go on a diet

Nope...... wrong answer, the correct answer has to be 55hp.

[koba]

Who knows if it's a good idea or even practical, but some time I am going to try an intercooler to see if we can chill the induction air.

Wouldn't that really only be effective if it was super hot to begin with?
Like coming out of a turbo...

It's really quite staggering how hot the compressed air from a turbo gets!

Some unkind person .... .....pointed out today, they had done the math and that when Av rides his 22hp bucket I would need 55hp to have the same power to weight ratio.

No wonder her bike zips out of the corners so fast.......... and I burn clutches.

If Aprilia managed 56 with a 125...

Hell, its only 550 hp per litre if you do it with a hundred...

hmmm, maybe losing weight as well as gaining HP is the go...

Get all anorexic and lose lots of weight...

Still not enough! hmm, cut a leg off...

Nope still not enough, another...

Nope, maybe one arm could re-jig the controls to suit...

Is that what people mean when they say: "Pushing shit uphill".

[bucketracer]

Wouldn't that really only be effective if it was super hot to begin with?

Yes your right, can't cool the incoming air that's at ambient temp below ambient by just using more air at the same temperature. But as anyone knows who has stood around in the wind wearing a wet Tee shirt, the evaporating water really chills things off. So maybe if TeeZee wears a wet T shirt over his leathers the idea could work.

[koba]

So maybe if TeeZee wears a wet T shirt over his leathers the idea could work.

Could work really well if it scares all the competition off...

[Buckets4Me]

Nope...... wrong answer, the correct answer has to be 55hp.

wrong again it's 60 h/p

[TZ350]

...... maybe if TeeZee wears a wet T shirt over his leathers the idea could work.

Watch out or you might just get flicked with a wet T shirt! http://www.youtube.com/watch?v=EdUcfab-J_A

[richban]

Who knows if it's a good idea or even practical, but some time I am going to try an intercooler to see if we can chill the induction air.

Cool air makes power. Sounds like a good idea to me.

[TZ350]

I hope this works.........

Rick has posted the results for Mt Welly, its exciting to see that the strokers are making a come back.

1st in the 1st A grade, 2nd 3rd and 4th in the second A grade race, the fast oil puddlers are still looking hard but now, not impossible to beat on a regular basis.

More and more I am convinced that outright power at Mt Welly dosen't count for that much, its more about the engines drivability and that once you have sufficent power one needs to look at increasing the power spread and punch out of the corners.

I have some ideas to try on the 27hp setup, the 27 because that already has a good power spread, the 30 is a bit vertical..........