The Bucket Foundry

[husaberg]

Yeah, Dave's dead but his son is still around ChCh somewhere. I seem to remember him coming to see the old man with drawings back when i was living at home. The old B often got asked for opinions on oddball shit - AMIMechE and a long race history and the family habit of offering opinions on anything got us a lot of visitors...
Dave was a Scott fanatic so I'd expect anything he did to be odd....

Lets see if this works......




Click on them a few times to supersize them.
Greg get a fast internet......

[WilDun]

Well HUSA, looks like you've really unearthed something here! - not sure exactly what, but hopefully we'll gradually get to understand it! Sorry for the guy who started it though, it looks like somebody will have to try to resurrect it before it disappears off the face of the earth,(GRUMPH?) - maybe consigned to the tip!

[Grumph]

Well HUSA, looks like you've really unearthed something here! - not sure exactly what, but hopefully we'll gradually get to understand it! Sorry for the guy who started it though, it looks like somebody will have to try to resurrect it before it disappears off the face of the earth,(GRUMPH?) - maybe consigned to the tip!

Don't look at me Will...The son, who's not young either, will probably give it to the local museum - if it survived the quakes.

[WilDun]

Don't look at me Will...The son, who's not young either, will probably give it to the local museum - if it survived the quakes.

Seen a lot of good stuff (which probably looked like junk to the average relative) sent to the tip, can't see my foundry stuff and my machinery managing to escape that either! - just hate to see how little many people care about the work of someone over a lifetime and all in the cause of being "seen to be" modern and tidy.

[F5 Dave]

Don't look at me Will...The son, who's not young either, will probably give it to the local museum - if it survived the quakes.

Ahh c`mon, young whippersnappers like you its all PlayStations and chasing girls.

[husaberg]

Just got back and have checked out all the developments of the last 24hrs on this thread - of course Husa has found some stuff, Grumph has contributed some interesting stuff in machining carbon fibre for Britten.

Ken, interesting stuff on the Bishop Valve, which, unless I'm much mistaken was taken from a much older and almost identical design, which I'll find after I rummage through my "archives".

Don't really want to get totally away from the original thread, but I'm going to try and post some pics of an interesting engine design of the late sixties also from my archives, (read grotty old scrapbook), this design apparently uses the same sealing method as you are proposing Neil. - of course the whole design is not a two stroke (or is it?).
I feel that the surface speeds at the sealing surfaces may be have been too high though, then again maybe not.
Obviously the design wasn't finalised and up and running, possibly not reaching the prototype stage.
Having had a quick look again, I can see that I hadn't sat down all those years ago and thought about the concept thoroughly enough to properly understand it !

Ok then, what other systems for a valve in the head? NOT popet valves!

Given what's now known about chamber shape and squish velocity - and that the squish needs to be symmetrical...I'm not sure there is a solution to putting an exhaust valve in the head.
I thought the sleeve valve was going to give you the right chamber shape plus rapid ex port opening ?

Yes, but I'm trying to think up other ideas to test as well.

How well does it have to seal?
If it was something I was doing I would be concerned with the strength of the "thin" side of the ring land. I also think that the surface the ring runs on will wear very quickly near the pivots where the ring velocity is low. And finally Im not sure how well it will seal, half of the ring will be pushed onto (maybe) the wrong ring land to seal combusion presure , ideally the actual ring profile will be a bit starnge.

Would it be possible to have a seal in the head with a wave spring under it ? maybe a carbon seal on a really hard ball

I dunno, but I say that so long as the pressure is undernearh the ring at the critical moment that it will force it upward. (downward? - whatever) Reckon it might be better if the ring could rotate in the groove, - (I guess).
Trouble is as I see it, with this scheme the valve is being accelerated and decelerated and brought to a halt twice per crank revolution and at around 10 - 12 thousand rpm .......... well! depends on whether its for racing or something else more sedate.

if you ceramic coated the bore of the valve so there was less heat transfer to the ball that might help at the cost of heating the return pulse, could you put water passages in the ball ? where would the gesparking plug live?

Anything is possible, can even put metal in the microwave these days

Aussie bloke did a Round ball with piston rings in the 70's I have the article here somewhere.
went fine I guess he had the same problem as the rest lubrication or smoke but not one without the other.
He converted a Honda single and an old brit banger. Could run very high comp ratio. I think it was meant to be very quiet which is counter intuitive....... faded away.....

and ten characters,,,,,,,,,,,,,,

[Flettner]

I hate Honda 100's, but thats a way cool one!
Mr Grumph / yow ling or others, do you know of a tube bender place in Chch that supplies exhaust stainless steel? 180 degree bends? 38mm outside. For a gyro exhaust I repairing for someone, turbo SUB4 engine. I'm running out of ideas.

[husaberg]

I hate Honda 100's, but thats a way cool one!
Mr Grumph / yow ling or others, do you know of a tube bender place in Chch that supplies exhaust stainless steel? 180 degree bends? 38mm outside. For a gyro exhaust I repairing for someone, turbo SUB4 engine. I'm running out of ideas.

I have seen stainless donuts on TM I think.
auckland
http://www.autobend.co.nz/tube_bending.html
chch
http://harrispipes.co.nz/history.html
I would have thought caldwells would have them but can't see them on the site?

Anyone who does cowsheds will have a source too

[Yow Ling]

this place is in wellington, http://www.ultibend.com stainless bends is their thing

actually its their 2nd biggest thing

[Grumph]

I have seen stainless donuts on TM I think.
auckland
http://www.autobend.co.nz/tube_bending.html
chch
http://harrispipes.co.nz/history.html
I would have thought caldwells would have them but can't see them on the site?

Anyone who does cowsheds will have a source too

I've had stainless pipes bent at Autobend - but i've had to supply the tube....Graeme at Motorcycle Exhausts who do all the Harris stuff may be a better bet if the Wgtn source doesn't pan out, I think Graeme carries some stainless.
trouble is the grade you need for ex pipes is pretty low...the good stuff stress cracks too quickly. i'd guess the cowshed tube is the better stainless as well as being thick wall.

[WilDun]

and ten characters,,,,,,,,,,,,,,

Yes, HUSA that's the one I was thinking of!!!! - was pretty sure you'd have it somewhere, what took you so long?

Of course in those days anybody who was anything worked wearing a white "technician's" coat, sometimes with a collar and tie too, probably talked in a posh accent for the TV as well! - at least that's what we were all expected to believe anyway!

[WilDun]

I hate Honda 100's, but thats a way cool one!
exhaust stainless steel? 180 degree bends? 38mm outside. turbo SUB4 engine. I'm running out of ideas.

I have 3 or 4 S/S bends somewhere in my workshop which I'll prob never use but don't hold your breath, I don't really know what size but could be somewhere round the size you want.
Will check it out tomorrow morning and let you know, they are 90 deg. but may still be of use to you.

[husaberg]

Yes, HUSA that's the one I was thinking of!!!! - was pretty sure you'd have it somewhere, what took you so long?

Windows 8.1 and the printer/scanner being no longer on the control panel anymore. That plus I had started to tidy the book collection, so it was kind of hidden on the floor of the office.

I will do the plastic engine tonight. (PEEK)

In the first paragraph or so it says the guy doesn't look like an engineer on account of his beard and glasses, i'm reading it and its like er.........that's what they do all look like.

I see they do some peek/carbon and ceramic composites now. might have been what John Britten had Greg

[Flettner]

Thank you, I'll try these contacts.

[WilDun]

FLETTNER,
Found 90deg (x6) bends, unfortunately turned out to be 50.8mm (2") OD.