ESE's works engine tuner

[wobbly]

Show us a picture with the A transfer - short circuiting is the main issue to be looking at with the shape of the Ex bottom.

[JdG]

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.

Best to use lock washers like Nordlock or similar. https://youtube.com/watch?v=IKwWu2w1gGk&feature=share


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[porttiming124]

Show us a picture with the A transfer - short circuiting is the main issue to be looking at with the shape of the Ex bottom.

[wobbly]

OK , so there is plenty of area between the A port front wall and the angled up corners of the Ex floor , good for reducing the possibility of short circuiting caused by over-scavenging.
Next issue is where does the A port front wall backward radial angle intersect with the bore centerline.
If that piece of rod is indicating that the intersection point is damn near on bore center , then work is needed.

[TZ350]

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After the massive over rev event a quick look shows all seems to be Ok. No piston cracks that I can see and the cylinder base studs feel Ok too.

[TZ350]

Best to use lock washers like Nordlock or similar. https://youtube.com/watch?v=IKwWu2w1gGk&feature=share

The Nordlock looks very interesting. I will have to see if they are available here in New Zealand.

Interesting that a Nylock nut was so much better than a double nut arrangement, lock or spring washer arrangements.

Ok.

Found a suppler here in NZ:- https://www.fasttrade.co.nz/



I expect I will have them in a few days. It will be interesting to see how they go.

[F5 Dave]

Geez, I would have thought that a double nut cranked up would have out done all?
Your photos are super low resolution. But thats an odd piston. What make is it?

[F5 Dave]

OK , so there is plenty of area between the A port front wall and the angled up corners of the Ex floor , good for reducing the possibility of short circuiting caused by over-scavenging.
Next issue is where does the A port front wall backward radial angle intersect with the bore centerline.
If that piece of rod is indicating that the intersection point is damn near on bore center , then work is needed.

Surely that welding rod is just the middle. The port interface looks maybe like it sweeps back more.

In my laboratory I use fluid dynamics to give a general gist of transfer direction. Ok. . . it might be the laundry sink tap aimed from a height at the transfer entrance one at a time.

[Frits Overmars]

In my laboratory I use fluid dynamics to give a general gist of transfer direction. Ok. . . it might be the laundry sink tap aimed from a height at the transfer entrance one at a time.

Been there, done that, until I noticed that by altering the flow entrance direction I could manipulate the outflow angle.
For this scheme to work you need a flow that fully fills the transfer duct's cross flow area from the beginning. And then within seconds you will have so much water in the cylinder that you can no longer see where it is going. On top of that gravity will pull the flow downward, giving a misguided impression of the axial flow component.
Unless you work with chocolate cylinders, I can recommend flame visualisation.

[porttiming124]

OK , so there is plenty of area between the A port front wall and the angled up corners of the Ex floor , good for reducing the possibility of short circuiting caused by over-scavenging.
Next issue is where does the A port front wall backward radial angle intersect with the bore centerline.
If that piece of rod is indicating that the intersection point is damn near on bore center , then work is needed.

Yes the rod indicates the intersection. To validate I just used the method that Frits proposes and it confirms that I must redirect the intersection more backwards as you say.

And to come back to the bottom shape of my exaust port. The shape of the rsa would be more fragile as a short circuit if the intersection of the A port is located at the center of the cylinder. That's right?

[F5 Dave]

Been there, done that, until I noticed that by altering the flow entrance direction I could manipulate the outflow angle.
For this scheme to work you need a flow that fully fills the transfer duct's cross flow area from the beginning. And then within seconds you will have so much water in the cylinder that you can no longer see where it is going. On top of that gravity will pull the flow downward, giving a misguided impression of the axial flow component.
Unless you work with chocolate cylinders, I can recommend flame visualisation.

Yes indeed you can, the 'from a height' bit makes it a bit more consistent, and probably the biggest kicker, is mostly I was dealing with 50cc barrels with tiny passages. Didn't think about gravity mind.

[TZ350]

Geez, I would have thought that a double nut cranked up would have out done all?
Your photos are super low resolution. But thats an odd piston. What make is it?

Yes, I would have bet on the double nut too. The piston is a NOS Suzuki, last of the air cooled RM250's.

I may be faced with re visiting the balance factor. I just put it together as is, fingers crossed.

[F5 Dave]

Bigger they are, the harder they fail, or something like that.

My 100 when rebalanced was really annoying in the pits but once out on the track was just fine. Compromise Compromise

[Frank S.]

Yes, I would have bet on the double nut too.

The double nut will never loosen. I don´t know how they tested but they obviously want to sell their Nordlocks

[Frits Overmars]

My 100 when rebalanced was really annoying in the pits but once out on the track was just fine. Compromise Compromise

My 360 single was never balanced, not even after it had grown to over 370cc due to the occasional seizure. Wen it was idling, sitting down on it blurred my vision. But once I put it into gear and it had to work for a living, all vibrations disappeared. Too bad the seizures didn't.
You win some, you learn some. I learned a lot. Like avoiding shrunk-in cast-iron liners. And air cooling in general. And clutch cables that are thinner than brake cables. Pulling the clutch because of a seizure doesn't do much good if the cable snaps. I survived without a scratch but it left the longest tire skid mark I've ever seen.