ESE's works engine tuner

[Ocean1]

Anyone here know about Mickuni oil pumps, can the drive shaft run either way? I see inside they are just a worm drive and an adjustable cam. I think I remember the valves are just spring loaded balls. It's not a rotating drum with ports is it or something like that? I don't want to pull this unit I have here apart if I can help it. It's out of a KE 175, reed version. By chance someone may know.
I guess I could just test in in the lathe.

Not very helpful, but some of them have internal ports feeding the pump bearings from the pressure side, which changes with rotation...

DAMHIK.

[WilDun]

It shouldn't. Seen from the inside of the crankcase the left and right flywheels appear identical. You can't see from there if one flywheel is much narrower than the other.

Ah, I see what you mean, I need to brush up on my ability to properly picture things in my head!
Maybe I should do a wooden model in order to visualise how it would work or find out why it is necessary at all! ).


.......... Did that (with polystyrene), now it's pretty well sussed!.....

[Flettner]

Not very helpful, but some of them have internal ports feeding the pump bearings from the pressure side, which changes with rotation...

DAMHIK.

I guess I might just have to pull it apart and see, bugger it. It has been years and years since I've had one apart and this little KE one looks a little different to the common Kawasaki / Suzuki units. This KE pump is very small and runs at crankshaft speed, direct coupling. The size and weight appeal to me just that where I want to use it the shaft turns opposite to it's original direction and my crank is also turning the opposite direction.

Google it! yes you are right, direction is important.

[husaberg]

I guess I might just have to pull it apart and see, bugger it. It has been years and years since I've had one apart and this little KE one looks a little different to the common Kawasaki / Suzuki units. This KE pump is very small and runs at crankshaft speed, direct coupling. The size and weight appeal to me just that where I want to use it the shaft turns opposite to it's original direction and my crank is also turning the opposite direction.

Google it! yes you are right, direction is important.

http://www.dansmc.com/2_stroke_oilpump.htm

bound to be a few Keihin MB5 ones laying about at my place
pretty sure they are direct but i have never had one appart.

[Niels Abildgaard]

For Niels.......In addition to superkarts...check out outboard hydroplane race motors at www.grmracing.com. Plenty of 1, 2, 3 and 4 cylinder motors to look at.

Thank You for links.
Opposed cylinders and straigth pipes.
Looks wilder and more expensive than buckets.
I will try to get more information.
Are there other manufacturerers and a forum like KiwiBiker but for hydros somewhere?
My marvellous V2 crank will be more mass but flywheel and the drive train to screw much less.

[dtenney]

Thank You for links.
Opposed cylinders and straigth pipes.
Looks wilder and more expensive than buckets.
I will try to get more information.
Are there other manufacturerers and a forum like KiwiBiker but for hydros somewhere?
My marvellous V2 crank will be more mass but flywheel and the drive train to screw much less.

Carlo Verona at VRP is another manufacturer.

For more information on the racing in the USA go to: www.ustitleseries.net and www.hydroracer.net

There is not really a boat racing site anywhere near as good as Kiwibiker that I know of.......most of the serious motor junkies i race with are transfixed on this site and this thread.

[Grumph]

There is not really a boat racing site anywhere near as good as Kiwibiker that I know of.......most of the serious motor junkies i race with are transfixed on this site and this thread.

Seattle Smitty has already given us a link to the "Building a looper beast" thread from the Boatracing facts forum too.

[MotleyCrue]

Hoping someone may be able to help. I once saw a video maybe from this thread or maybe on YouTube where these guys were racing boats with like a half of an exhaust pipe. They had the big diverging part but thats it, no rear cone. Really loud. It was some sort of race series and I think it was the rule that the exhaust had to be like that, maybe in Indonesia or somewhere like that. The boats raced down a small river I think. Anybody know what I'm talking about? Link? I tried searching Google but must not be putting in the right keywords.

[Muciek]

Crazy Thai Drag Race Long-tail boat

https://www.youtube.com/watch?v=9CPZ3svFfn0

[tjbw]

Hoping someone may be able to help. I once saw a video maybe from this thread or maybe on YouTube where these guys were racing boats with like a half of an exhaust pipe. They had the big diverging part but thats it, no rear cone. Really loud. It was some sort of race series and I think it was the rule that the exhaust had to be like that, maybe in Indonesia or somewhere like that. The boats raced down a small river I think. Anybody know what I'm talking about? Link? I tried searching Google but must not be putting in the right keywords.

Include Thai long tail boat in the search. Or just look at this posting by our friend Luk:

https://m.youtube.com/watch?v=Yp91Ml5mxg0

and read his description.

[Flettner]

I tried searching Google but must not be putting in the right keywords.

You probably just missed out the word CRAZY.

[dtenney]

You probably just missed out the word CRAZY.

The "half an exhaust pipe" is called a megaphone exhaust. This preceded the development of the tuned pipe. The correct length megaphone exhaust has some of the same effect as a tuned pipe...but with a much smaller effect than a tuned pipe. Tuned pipes made megaphone exhausts obsolete.

With megaphone pipes there is also a "small" issue with noise. A two stroke outboard with megaphone exhaust, running a blend of nitro and methanol, produces the most beautiful but ear wrenching sound ever. It can be heard for miles....that is not a positive in today's world.

[WilDun]

Tuned pipes made megaphone exhausts obsolete.

Tell them that (they won't hear you).

It can be heard for miles....that is not a positive in today's world.

These guys have turned everything we have learnt on safety and the two stroke motor on it's head - and we thought the IOM was madness!
I mean going at those crazy speeds facing backwards!

[teriks]

.. not to mention that razor sharp prop just waiting to cut you into pieces if you fall out of that.. thing.
Crazy fun though.

[TZ350]

These are the ugly NSR heads with the offset plug that nobody seems to want. But they could be answer to my problem of how to get access to the combustion chamber to measure the combustion pressure so the EFI system knows if the motor has fired or not.

By a happy coincidence the pressure sensor neatly screws into the plug hole and the center of the combustion chamber has a cast in supported between it and the outside shell. It maybe enough to fit a 10mm central plug in. Two birds with one stone, pressure sensor and central spark plug.

Now to find another of these heads so I can cut it in half to see how much meat there is between the combustion chamber and outer head shell, enough for a 10mm plug I hope.....