ESE's works engine tuner

[TZ350]

Changed the gearing to suit Taupo, geared for about 116k max. Took the cylinder of to ease any high spots and for a hand linished piston it looked real good, so no problems there.

Reassembly and final run tommorow to check all is ok and that the gearing is right. Last job to do is set the preload on the front forks and all should be good.......

Then its off to Taupo boxing day, camp overnight somewhere and then the mad rush in practice to qualify well for a good place on the grid.

[speedpro]

116K???

My old RG/MB was geared for 160ish and would peak out no problem.

[TZ350]

My old RG/MB was geared for 160ish and would peak out no problem.

160ish.... on the new Taupo track????

We have run a GPS data logger around the track and it looks like the fastest bit is going up the back, the front straight is not as fast.

[TZ350]

More on carburettors.

"Usually the atomisers on carburettors intended for two-stroke engines are manufactured in two types: with either long or short upper parts (figure 23). The atomisers with longer upper parts cause a weakening of the mixture at low speeds and du ring acceleration from low speed; on the other hand, atomisers with shorter upper parts produce extra enrichment. Carburettors for racing motor cycles use atomisers with short upper parts."

The rest can be read here:- http://www.mypage.tsn.cc/rdd/TT/cont...lorto_3_6.html

[bucketracer]

I hear there are moves afoot at MNZ to bring out a regulation class standard carb for F4 2Strokes, here is a draft drawing of it...............

Attachment 226948

[F5 Dave]

Must be when we ran the long old track that they were hitting 160!

Well I've packed the 50 in the van. Too bad I won't get to ride it this year, or even see it.

Have a good run guys & make sure there are 2 strokes in the top 3 places!

[50bucketracer]

Must be when we ran the long old track that they were hitting 160!

Well I've packed the 50 in the van. Too bad I won't get to ride it this year, or even see it.

Have a good run guys & make sure there are 2 strokes in the top 3 places!

Who's riding your 50 if you're not?

[jasonu]

I hear there are moves afoot at MNZ to bring out a regulation class standard carb for F4 2Strokes, here is a draft drawing of it...............

Attachment 226948

Looks good to me.

[wobbly]

Bestest idea ive seen for ages, the 2 strokes would still smoke the 4 strokes, only part thats a worry is the "regulating needle" thing - too much to play with.

In the interest of real world science here I would say that 27 RWHp from a 125 is nothing to jump up and down about.
Water cooled 125s with 30mm carb in ICC karts make 44RWHP ie around 50 crank at 13000,running a straight line ignition on unleaded.
If someones got enough folding I would soon knock up and guarantee an aircooled with 24mm carb that makes an easy 38crank = 32RWHp,as this only represents a bmep of 11.3 bar or 164psi - so the carb isnt the limiting factor at all,in fact it would help the spread.

[TZ350]

Very Tempting........

[jasonu]

Bestest idea ive seen for ages, the 2 strokes would still smoke the 4 strokes, only part thats a worry is the "regulating needle" thing - too much to play with.

If someones got enough folding I would soon knock up and guarantee an aircooled with 24mm carb that makes an easy 38crank = 32RWHp,as this only represents a bmep of 11.3 bar or 164psi - so the carb isnt the limiting factor at all,in fact it would help the spread.

Enough folding = ???$'s

[richban]

If someones got enough folding I would soon knock up and guarantee an aircooled with 24mm carb that makes an easy 38crank = 32RWHp,as this only represents a bmep of 11.3 bar or 164psi - so the carb isnt the limiting factor at all,in fact it would help the spread.

Dude not fair. At the risk of being beaten up buy Kev, I want one. Maybe you should bring that RS250 monster you have built and I can ride it in the 3 hour.

[bucketracer]

Buckets4me and I have been playing on the dyno with his RG50. Baseline was 11.6hp DIN and after fitting a different ignition and new clutch and 26 runs later we finished with 14,0 RWHP DIN.......... ... BucketGP here we come.

[TZ350]

I hear there are moves afoot at MNZ to bring out a regulation class standard carb for F4 2Strokes, here is a draft drawing of it...............

Attachment 226948

I am afraid this one is banned, to clever, all those ajustable jets and air mixtures and so on, but its greatest sin is having no venturi, and without a venturi the tec people couldn't figure out what size it was?...........

Attachment 226996

I guess we will have to make do with what we have got. I found these pictures of someones efforts to improve the air flow through a round slide carb, they look like a good idea to me.


Attachment 226999Attachment 226997Attachment 226998

And the best carb chart I have seen yet.........

Attachment 227003

[TZ350]

Sleeving carbs, It looks like others are doing it too.........

"The Splitstream Velocity Insert Tube is a Venturi which is installed in the back of the 2009 CRF 450 Throttle Body, reducing the stock 50mm throttle body diameter for increased power across the power curve particularly in the bottom to midrange of the engine.The boost in torque " http://mainmoto.com.au/sscat/cat/Spl...cityInsertTube


Attachment 227004