The Bucket Foundry

[Flettner]

I just worked it out via the exhaust port timing (for length) and tapers were my generic chamber design calculation
One issue I see (forgot about) is the outlets from the pipes are large, was going to fit inserts in the pipes. That could be why the pipes don't seem to be working very well?
2 x outlets at 19mm (125), far too big!

[husaberg]

I just worked it out via the exhaust port timing (for length) and tapers were my generic chamber design calculation
One issue I see (forgot about) is the outlets from the pipes are large, was going to fit inserts in the pipes. That could be why the pipes don't seem to be working very well?
2 x outlets at 19mm (125), far too big!

I occasionally come up with an idea.
Go back a page.
Frits would be able to anwser, or at least a educated guess but with a twin exit single should they be half the volume and working sizes ID's of a normal 125?
Or is there some other rule of thumb.
Does it have a decent power spead anyway?

[Frits Overmars]

Frits would be able to anwser, or at least a educated guess but with a twin exit single should they be half the volume and working sizes ID's of a normal 125?
Or is there some other rule of thumb?

With a cylinder capacity of 62,5 cc per pipe, you just calculate a pipe for a 62,5 cc engine, simple as that.
The end restrictor diameters should be about 15 mm each. Go bigger if the engine gets too hot.

[husaberg]

With a cubic capacity of 62,5 cc per pipe, you just calculate a pipe for a 62,5 cc engine, simple as that.
The end restrictor diameters should be about 15 mm each. Go bigger if the engine gets to hot.

Chairs.............

[breezy]

Chairs.............

tables.....

[WilDun]

And lets not start talking s***t by mentioning stools! - lets just stick to pipes. (wasn't me,- it was Husa started it!).
Cheers

[Flettner]

Does it have a decent power spead anyway?

It's interesting, it doesn't fourstroke at all like a normal twostroke. it reminds me a lot of my uniflow engines with a linear power delivery. The uniflows didn't run chambers as such though, this sleeve engine does have a sort of a power band. It doesn't seem to have a lot of power (maybe 15HP, Ryger need not worry) but it will rev out (just like not having a chamber), I've adjusted the timing a little and will manufacture some exhaust inserts. I think I've still got Gerbalgronks Go Pro so I'll have a go at videoing the next run so long as it doesn't poo itself.
It's running CR250 V Force reeds (don't ask, they were just available) and has a massive (volume) crank case, I'm sure these don't help.
I'm not to disappointed I do remember the 350 when it first started out being real gutless, so with a bit of time we might see 20HP!

[Frits Overmars]

with a bit of time we might see 20HP!

Then I've been 'a little' to optimistic regarding the power and a bit too careful regarding the restrictor diameters. If you make them 12 mm, you should be safe till 30 HP.

[Flettner]

Frits, a builder of stuff I might be but a tuner I am not.
It will take me a while, I get there usually but it always takes time.
I do have this dyno here but finishing that is a project in itself!

[husaberg]

tables.....

Suite (probably only makes sense to a kiwi)

It's interesting, it doesn't fourstroke at all like a normal twostroke. it reminds me a lot of my uniflow engines with a linear power delivery. The uniflows didn't run chambers as such though, this sleeve engine does have a sort of a power band. It doesn't seem to have a lot of power (maybe 15HP, Ryger need not worry) but it will rev out (just like not having a chamber), I've adjusted the timing a little and will manufacture some exhaust inserts. I think I've still got Gerbalgronks Go Pro so I'll have a go at videoing the next run so long as it doesn't poo itself.
It's running CR250 V Force reeds (don't ask, they were just available) and has a massive (volume) crank case, I'm sure these don't help.
I'm not to disappointed I do remember the 350 when it first started out being real gutless, so with a bit of time we might see 20HP!

If it doesn't four stroke that s pretty cool in itself.
Plus it can still be supercharged.........

[Flettner]

Suite (probably only makes sense to a kiwi)



If it doesn't four stroke that s pretty cool in itself.
Plus it can still be supercharged.........

It is supercharged, pulse charged.
Well a subsequent ride has shown ----- nothing, runs the same, maybe 16HP?
Can't be mechanically supercharged until I change the exhaust port timing (phasing).

[husaberg]

It is supercharged, pulse charged.
Well a subsequent ride has shown ----- nothing, runs the same, maybe 16HP?
Can't be mechanically supercharged until I change the exhaust port timing (phasing).

I am happy to provide ther road Roadranger button.

[Flettner]

Might try leaning it out a little as I remember the uniflow engines could be quite rich and still run clean, but gutless.

[breezy]

Might try leaning it out a little as I remember the uniflow engines could be quite rich and still run clean, but gutless.

hi Flettner, good work as usual and interesting. Maybe the amount of exhaust port area is too much for the 125 and your losing the pulse strength making the engine feel lack luster and no real power band. Perhaps seal off one of the exhaust port outlets for now as an experiment.

[Flettner]

hi Flettner, good work as usual and interesting. Maybe the amount of exhaust port area is too much for the 125 and your losing the pulse strength making the engine feel lack luster and no real power band. Perhaps seal off one of the exhaust port outlets for now as an experiment.

You might well be right! It does have the port area to rev all to hell. But probably not the mechanical strength to do So? And yes that is good idea to try, nice and easy.