ESE's works engine tuner

[kel]

You going to race in the Sandbaggers race this year?

I sure would like a trophy. But seriously - only went in that class last time out as I didn't have a MNZ licence.
To be honest I thought I had lost all interest in kart track racing, but last weekend was a blast. You might be stuck with me for a while yet
Well done AMCC, was well run and enjoyable event!
Will get some 2hr on board footage uploaded in the next couple of days.

[seymour14]

The peak of bucket chassis development is certainly the GPR chassis at the moment. Very nice units.
That 2T motor looks very "competitive" with it's little built-in water pump housing.

Wouldn't be interested in the project if it wasn't fully legit. She's all above board, and allergic to water.

[seymour14]

I sure would like a trophy. But seriously - only went in that class last time out as I didn't have a MNZ licence.
To be honest I thought I had lost all interest in kart track racing, but last weekend was a blast. You might be stuck with me for a while yet
Well done AMCC, was well run and enjoyable event!
Will get some 2hr on board footage uploaded in the next couple of days.

Be good to see. Scott tells me that the GPR's forgot to press go on their camera. So that was extra weight doing not a hell of a lot of anything.

Hope no one bothered to wave at it as they rode by.

[Bert]

Wouldn't be interested in the project if it wasn't fully legit. She's all above board, and allergic to water.

I think you took the bait there buddy...

[SwePatrick]

Page 1380 ...

A long time ago i spoked about my Honda MT5 engine.
You said i should get back to you with news.
Now i finally got some worth telling about.
I now own a dyno that´s measuring at the enginesprocket.
And this is the first pull ever with this engine in my bench.

I have spent a couple of weeks with a smaller engine to sort things out.
The small engine(66cc MT5) produced with fairly low tune in cylinder a healthy 19hp at 11200rpm with a worn out piston but with a really good register.
It was equipped with an old Autisa cylinder bored up to 45.5mm, just portmatched it to crankcase and grinded off some debris in all ports.
Keihin round throtte 27mm
'derbi design' reed.(tnx Wobbly)
Morbidelli pipe(homemade copy)

However, this was my dynomule, nothing to fancy.

Now to my serious MT5 engine that i´ll post a dynoscreenshot of in this post.
This engine is built to not make a ny worldrecords in torque as i want to be kind and not stress the 'under dimensioned' clutch/gearbox.
Setup:

Honda MT5 engine 5speed.(6speed breakes very easily i noticed)
132cc
6 disc clutch
MT8 crankshaft with 110mm samarin rod.(stroked to 50mm)
Kawasaki KX 125 -86 cylinder bored to 58mm(Woessner CR144 piston)
A lot of porting (199/138/138/140 durations)
Derbi design reed.
Keihin PWM 40mm, slightly modded.
Ignitech ignition, ran at the first pull(screenshot) exactly the same curve as my small 66cc engine, just raised rev,stop.
Homemade combustionchamber insert.
Homemade pipe, Actually built just with 'feeling', no calculations at all.
A lot of welding has been done to the crankcase to accept crankshaft and cylinder, Finally coated crankcase to block out some heat from gearbox.

And about the dynopull,, i hadn´t connected cooling so i just went for a quick to see if ignition worked.
When i realized it did work i let of the throtttle a bit at about ~11000rpm.
Things were much faster than the small engine, i couldn´t keep up *lol*
I also gave it full throttle at about ~8000rpm.

The weather corrections was a bit off when making screenshot, the final number is actually a little bit higher.
And remember, dyno reports in HP and Lbf-ft.

Screenshots:



There is some tuning left as this was the first pull ever with ignitech on this engine.
Previously had PVL(458)
I aim for 40hp+ at sprocket, it was 39.09 in corrected hp in this pull and 17.xxlbf.ft in torque.
44 should be a cool number as Derbi produced that also , i got a small advantage as i got 8cc more.

Rgds
Patrick

Edit:
A picture of actual engine in dyno:

[breezy]

looking good Patrick ... congratulations

[MotleyCrue]

Patrick, looking at your picture on the dyno, the carb is angled a lot to horizontal, probably twice as much as I have ever used. I have an application where a steep angled carb would be ideal but I wasn't sure whether running a regular carb at a steep angle would work or whether a 4 stroke "downdraft" motorcycle carb like they use on 600 cc and 1000cc engines could be made to work right on a 2 stroke and what modifications that would entail ? How steep can a regular Mikuni or Keihin be mounted?

Also have you or anyone run a Lectron carb? I have heard that they are fantastic and I have heard they are anything but fantastic (not enough circuits).

[SwePatrick]

Breezy - Thanks =)

Motley: I have actually not made any mods to floater or anything inside the bowl.
This Keihin PWM seems to accept this steep angle.
The only mods i´ve done is in the bellmouth and inside(smoothened the bore)

I had an Mikuni 39mm TMX before(from an Honda CR250), And it overfloated like crazy when engine hit the powerband.
It just sprayed fuel all over the engine from the airholes that ventilates the bowl *lol*
That carb i had to almost have horisontal.

Edit: about Lectron, once you got them perfect, they are almost just that, Perfect.
But this is a 'moped dragracer' and budget is kept low.
A friend runs a 32mm lectron on his 90cc Honda MT5 engine running on alcohol, but it´s a hell of a job getting it perfect.

And as i port and polish a lot of engines, i know that bends is an enemy of all airflow

[TZ350]

A long time ago I spoke about my Honda MT5 engine. I now own a dyno that´s measuring at the engine sprocket. And this is the first pull ever with this engine in my bench.

Good work, I am very impressed ...

I hope to have a new engine to test soon too.

[FastFred]

The GPR 2T looks good and went very well but the ignition trigger rotor broke loose. Apparently it came away after the bike had been started several times using a battery drill to spin it over by the crank nut.

There's always teething problems, everyone's been there before!

I think TZ was very impressed with starting the bike by spinning it over with a battery drill. You don't have to put your helmet on and it saves all that exhausting pushing around the pits. Good Idea ...

[seymour14]

I think TZ was very impressed with starting the bike by spinning it over with a battery drill. You don't have to put your helmet on and it saves all that exhausting pushing around the pits. Good Idea ...

At least the weren't "kick starting" it.

In one respect, at least it has had an outing, shown up a weak spot, and something can be done about it.

[FastFred]

At least the weren't "kick starting" it.

Bet TZ would have liked to kick his EFI bike when it was being troublesome.....

[jasonu]

Well the 2Ts didn't fare very well in the 2-hour race. Seems to be an opportunity to consider rule changes to even the playing field. That's how it works isn't it?

Oh wait. 2Ts already have an unfair advantage

Mike you naughty boy!!!

[jasonu]

In one respect, at least it has had an outing, shown up a weak spot, and something can be done about it.

That's what it is all about!!!

[SwePatrick]

Good work, I am very impressed ...

I hope to have a new engine to test soon too.

Thanks, yes i´m following your project =)

And by the way,,, the noise my engine makes.. insane!
The exhaustnote is like an old 80´s 250cc,, but revs like an 70´s 50cc dirtbike, Goosebumps