ESE's works engine tuner

[diesel pig]

24/7

That is very interesting. If there is anything you can let us know about it doing this would be great.

[husaberg]

That is very interesting. If there is anything you can let us know about it doing this would be great.

its a nitro 2 stroke powerboat they are rc and go arround and arround like a pylon racer it seems.
look at his other videos.

[F5 Dave]

He could have been fettling a cat for all I could see in that video.

[Frits Overmars]

One advantage of boats over planes: it's much easier to an keep an eye on them.
https://www.youtube.com/watch?v=4NmnfRz-03g&t=0m8s
http://www.youtube.com/watch?v=5aBCQGq5Al4

[lohring]

I've been racing radio controlled model boats for a long time. They run engines that vary from 3.5 cc engines with nitro fuel to 64 cc gasoline fueled twins. Electric motors can run batteries from 4 to 40 volts. A NASCAR driver (Martin Truex Jr.) has set several of the nitro fuel (up to 80% nitro) records. My partner and I set several of the early over 100 mph gasoline records, but the fastest RC model boat record is held by Jörg Mrkwitschka at 285 kph with an electric powered boat. Engine development is responsible for much of the improvement in IC engine power, while lithium polymer batteries, propeller development, and high current motors and speed controls have helped electric power. We did a lot of the gasoline power development starting in 2004 and set records that stood for over a decade. We also designed and built a full size electric hydro that still is the fastest electric kilo record holder at 158 kph set in 2008. All official records are two way averages. The fast pass is usually higher. Some of these record holding boats are pictured below.

Lohring Miller


https://www.youtube.com/watch?v=Z8q3SvV6iiY&t=63s
https://www.youtube.com/watch?v=biV6pegXh-M&t=6s
https://www.youtube.com/watch?v=4d3LjfZJhes
https://www.youtube.com/watch?v=-yNu...index=20&t=49s

[husaberg]

He could have been fettling a cat for all I could see in that video.

Well it did have 2 h̵o̵l̵e̵s̵ hulls

[F5 Dave]

Well I didn't mean to be disrespectful, but, maybe if I had a real large monitor, or perhaps, the camera was a fair bit closer to the actual equipment I could see what was going on.

Talking of cats, working from home and mine is in search of an early dinner. I'll hide in this room and be very quiet.

[TZ350]

1st and only sort of useful dyno run for the F81M. Looks like lots of carburation and ignition to sort. Some earlier rubbishy runs showed the bike is effectively geared for 105mph at 9,500 rpm top gear.


Tried for another run and it screamed its head off, hit maybe 11-12,000 rpm. It was insane and the vibration was something to behold. Things that I thought were tight, moved. I had to put my hand over the carb bell mouth and flood it to calm it down. Found the modified cylinder base nuts had come loose and the cylinder was clanking up and down. I had turned off the little grippy ridges on the face of the nuts, thinking they were fretting into the cylinder base and allowing the nuts to loosen off. Good time to take the cylinder off and check the piston for cracks. I will try Belville washers next.

The ignition system is a real flame thrower. Even though I have a direct earth from the engine case to the common earth point I was getting goodly amounts of tingle when I touched the clutch or gear lever. Time to look at putting another earth connection directly under the plug.

[Vannik]

I will try Belville washers next.

Use Clevelock nuts or similar metal locking nuts. Bellville washers will do nothing other than provide a slippery surface for the nut to rotate against.

[husaberg]

Use Clevelock nuts or similar metal locking nuts. Bellville washers will do nothing other than provide a slippery surface for the nut to rotate against.

They were also unfortunately used as adjustable clutch actuation spring packs in KTM minis.
Thank the mighty sky pixie and all their children they changed to coil springs in 2009.

Mini rider dads the world over rejoiced.
We no longer had to count and recount and make sure they are positioned exactly to suit each surface and rider talents experience. It was trouble if you didn't change the oil every 1-2 hours as well as they gummed up with clutch shoe material.

we used to rely on diagrams like this.
l(((((()((((()))(()ll

[Frank S.]

You could cut the cooling fin to make room for a double nut.
Or extend the clamping lengh by using a longer stud and a spacer sleeve.

[F5 Dave]

What a fabulous idea. Find a longer stud and. . . Actually, looks like there is the 2nd fin already cut, at least at the rear.

[husaberg]

That base thickness on the Bighorn certanly appears to be weakness


esp when you look at The 50cc here from A Degnes and the NS500.


longer studs and a hole drilled through the top or the spacer welded to the bottom or a "Neil" cylinder.
Pretty sure Wobs tz400 has a spacer welded to the top or bottom?

[TZ350]

What a fabulous idea. Find a longer stud and. . .

I am not sure what the Kawasaki had originally but it now has M12 by 1,75 pitch studs set 20mm into the cases.

My TS250 Suzuki engine has M12 by 1,25 fine pitch threaded studs. My guess now, is that the fine thread has inherently more anti vibration nut jamming power.

In putting the Kawasaki together I used what I had and I also glued the studs in-place to lock them into the case. Hard to remove without damaging the case.

The nut is about 6mm thick so two 3mm nuts locked against each other could work.

[porttiming124]

Hello everyone.
I am working on a drag snowmobile engine with a bmep of 12.2@9800 rpm.
I have a question about the shape of the bottom of the exaust port. I made myself a pattern with the shape of the aprilia rsa exaust port that I oversized for the diameter of my cylinder. On my engine the bottom is more v-shaped. compared to the aprilia which is flatter in the middle. What do you think of it? thank you