ESE's works engine tuner

[bucketracer]

My 88cc machine is in the area around 20hp at the wheel.



that´s a pic of my 88cc hybrid.
from the beginning a watercooled cylinder, shaved off the waterjacket and replaced it with cooling fins like an std MT5 cylinder.

My 136cc project is an 'hybrid' that too.
I have built an clutchcase that gives room for 8discs.

Hi Wobbly, I am not sure if he is talking about 88cc or 136 but as you have pointed out, certainly not 50 .....

[SwePatrick]

Uh,, oh.. sorry guys.
i Thought you understood that i dynoed my latest build.
That is the Honda MB5 in pictures and with 58mm bore and 49.5mm stroke.(i calculated wron earlier this year, got it to 136cc, but it is slightly above 130cc)
No way you can get 21hp out of 50cc with no added boost at those rpm.
I got 130cc in the new build.
Big problems with fuel in dyno thou

And to clear up some misunderstandings, i haven´t got any engine that is on 50cc.
I got an MT5 with an 88cc engine also, but that one isn´t dynoed.
that is the one with aircooled cylinder on pictures.

My 130cc is watercooled.

Rgds
Patrick

[TZ350]

Well things didn't go to plan today, after practice and prelim races, engine failure and a masive high side that slam dunked Kel. Team ESE apologise for the hold up while the ambo attended to Kel and took him off for a few Xrays. The police cars turned up because they had heard the call for an ambo and thought a motorcyclist had been knocked down in the street outside.

Well we are not sure what happened and will take the Beast apart later in the week and see what went wrong.

Otherwise it was a great day, well run, friendly bunch of riders and the rain held off until the end of the last race.

[Henk]

Never good when someone gets a ride in the white bus. Let us know what you can regarding how Kel is.

[speedpro]

Awesome series of photos. Kel will want a set, eventually. Hope he's OK.

[ief]

Nice pics indeed but looks painfull non the less, hope it's not to bad.

And damn those engine troubles

[wobbly]

Nearly as good as Stoners loose in Qual, countersteering with the wheel in the air - dump it down facing the wrong direction and the thing gets real big air with him on the deck.

[F5 Dave]

Sorry Patrick but we don't always remember what other people are running, - I also thought "22 from a 50 & then at only 8000, double bull". But back to the 136cc if its pulling that at such low revs it still looks like it will turn out to be quite useful, hope you can sort the carb issue.

I've made the mistake of setting up a inlet on the bench & found when I put the engine in the frame it was too steep for the carb.


Hope Kel is ok.

[TZ350]

Hope Kel is ok.

Kel called around today with his arm in a cast, broken bone in his hand and elbow, 6-8 weeks before the cast comes off, so just in time for the start of the North Island Series.... ..... well hopefully.

The engines symptoms looked the same as Taupo and Kaitoki where the ignition was wrong and I felt very depressed thinking I still hadn't got a handle on this TPS and 3D ignition mapping thing.

There were suggestions (not from Kel) that I should de tune it a bit to make it more reliable and I was tempted until I thought about it and realized that 100% of F4 2-Strokes that have failed when racing all made less than 31hp.

In fact the last blowup reported the other week in another thread was a 14rwhp 125, so the idea of de tuning for reliability is dumb. The right thing to do is develop the reliability of this engine and at 9 bar clearly this engine is not all that stressed, and I should be able to push that up to 10 or possibly 11.



Took the head off and it turns out that the modification I had done to the piston so the ring gap ran in the boost port for improved reliability was the problem. The pin had come out and jammed the ring and piston.



So shot ourselves in the foot again but in a different and more imaginative way this time, sorry Kel.

Now does anyone know what the realistic upper BMEP number is for an air cooled 2-stroke because I would like to go there?

[Dutchee]

Awesome pix from Damien.
He went past Craig and about stopped, so thought something had gone wrong. cops turning up was hilarious as we'd just had that buggy turn up earlier. fun times.

[bucketracer]

... shot ourselves in the foot again but in a different and more imaginative way this time ...

A true Burt Munro achievement ...

[SwePatrick]

Sorry Patrick but we don't always remember what other people are running, - I also thought "22 from a 50 & then at only 8000, double bull". But back to the 136cc if its pulling that at such low revs it still looks like it will turn out to be quite useful, hope you can sort the carb issue.

I've made the mistake of setting up a inlet on the bench & found when I put the engine in the frame it was too steep for the carb.


Hope Kel is ok.

It´s ok.. i blame myself

Yes 21hp at those rpm´s is good news althou it just died short after, it tells me something is quite good.
It´s tuned to make peakpower at ~12000-13000rpm
The dyno was run with KIPS ports closed, and when i came home i opened them again, it´s an certain gain in power what i can feel from my 'buttdyno', dunno how much, but there is a gain, if i´m allowed to guess, at 8500rpm maybe 1 or 2hp.
But way more at 12k rpm, but i can´t say any numbers as i haven´t reached those rpm´s in the dyno.
Home on the street it works just fine.

A question for you guys..
Keihin FCR40, is it possible to get them to work on 2stroke?
Or is there any other good downdraft 40mm carb out there?

Rgds
Patrick

[wobbly]

All the FCR carbs will work fine on a 2T.
The shroud in the carb bore is the same, as are all the air/fuel circuits the same as a PWK etc, but the FCR has an extra idle fuel jet ( screw adjustable).
The emulsion tube is removeable but is a fixed size.
All the adjustment is done on the needle dia, taper angle and taper start point - as are all Keihin 2T carbs.
To get the standard range of needles to work on a 2T the tube has to be reamed out, as all the 4T setups are very lean.

TeeZee, forget the twats saying detune the GP125 - forget your thoughts on doing anything else at all - make it reliable.
At 30 Hp its fast enough to win anything.
The power being made didnt affect the piston falling into the too wide EX, the power being made didnt overadvance the midrange timing, the power didnt make the ring pin fall out - etc etc

[teriks]

To give you some idea of what I'm messing with, something completely off topic. -except for being two-stroke and somewhat bucket, as in old engine, well, and some tape and tie wire.

.. or maybe I just like the beautiful blue color and need to share it somehow

[wax]

Shouldnt the wheels point down.

haha

cool toy