The Bucket Foundry

[lodgernz]

No problem, I jump from poject to project so fast even I don't know whats going on most of the time. But in this instance I do, the little piston is required to raise the compression very quickly at just the right time hence the double speed. I may be fitting oval gears soon to get even faster rise time, but we will see how this goes first. Original proposal was for three times engine speed but I think that is just silly.

Oh, perfectly clear. I guess the extra stroke of the little piston around BDC has no negative effect. Maybe helps eject exhaust gases?
With oval gears you might be able to get it to stay in its lowest position thoughout most of the combustion phase.
As it currently is, it must be moving back up as combustion is going on, presumably reducing pressure on the real piston?

[Flettner]

Oh, perfectly clear. I guess the extra stroke of the little piston around BDC has no negative effect. Maybe helps eject exhaust gases?
With oval gears you might be able to get it to stay in its lowest position thoughout most of the combustion phase.
As it currently is, it must be moving back up as combustion is going on, presumably reducing pressure on the real piston?

Problem is, I don't know where combustion is actualy taking place? Where I think it's happening, the small piston is still nearing it's TDC with the big piston just over TDC. Burn should be rather quicker than normal ignition as it's taking place all over the chamber at the same (ish) time, not starting off at the spark plug and the moving through the chamber. Normal combustion, first part of combustion is quite slow as the flame kernal surface area keeps doubling in size, exponentially until all is consumed.
This HCCI type of combustion should create lots of small fires at once throughout the combustion chamber, working piston is just over TDC to hopfully take advantage of this quick combustion. With normal HCCI this "ignition" timing is hard to control but that is where the timed small combustion piston should give an accurate point. Or not, I guess we will find out.
Small piston will add to the expansion ie do useful work. but is not part of the swept volume calculation for CC rateing.

[lodgernz]

Thanks Neil. Fascinating.

[Flettner]

Rings turned up today, had the HCCI running again, similar results but I seem to be able to modulate the engine by the spray gun trigger now, although still pretty hairy.

[TZ350]

Good Work ....

[Frits Overmars]

Think that for first running ... I'll just cobble up a small aquarium pump, but for on a kart, probably will just use a common axle driven , via a belt drive, pump.

Keep those karts waiting on the start line for 30 seconds and the coolant in the cylinders will be boiling. Bring your own tea bag .

[Flettner]

I give up, this is too frightening. The HCCI engine caught, after a big dose of fuel and away it went. Stoped the fuel and jumped away, how hard can an AG 100 rev before it spreads itself all over the workshop? It just kept reving (screeming ) until it had consumed all that was in it's crank case and anything else it could find to consume and burn. Should have put my hand over the inlet I guess but I thought it might consume that too
This engine needs a real load, free reving is not to good for it's health or for that matter mine. I thought I could use the electric starter motor for some load but no, it just keeps spitting the belt off and I don't think the electric motor is very happy about it.

[Grumph]

Have you got a spare prop sitting round that could be used as load ?

Hmm, might have to anchor the testbed down a bit better......

[Flettner]

Have you got a spare prop sitting round that could be used as load ?

Hmm, might have to anchor the testbed down a bit better......

I do, and it would probably work well. First though I need a clutch for the AG 100. It turned up here with advice that the kick starter didn't work. So after a look inside I see the reason the kick starter don't work is no clutch! I was waiting for someone to trade a rooted AG 100 in to Blackwood's but low dairy payout seems all the farmers are hanging on to them. One will turn up.

[husaberg]

I do, and it would probably work well. First though I need a clutch for the AG 100. It turned up here with advice that the kick starter didn't work. So after a look inside I see the reason the kick starter don't work is no clutch! I was waiting for someone to trade a rooted AG 100 in to Blackwood's but low dairy payout seems all the farmers are hanging on to them. One will turn up.

post something here.
http://www.kiwibiker.co.nz/forums/sh...needed/page121
Pretty sure whitetrash or Drew had a dt100 I will ask.

Site inductions work.

Visitor injuries are lowered....because no one can be fucked with the induction, so they don't go to sites.

Do you have a Ag100 clutch drew.

[F5 Dave]

Have you got a spare prop sitting round that could be used as load ?

Hmm, might have to anchor the testbed down a bit better......

Gee, that sounds, um, slightly, you know? . . . dangerous?

[husaberg]

Gee, that sounds, um, slightly, you know? . . . dangerous?

I posted a pic of Bert Monroes Dyno somewhere. that had over 6 feet of chain whipping around.
Neil could hook up the engine to his water brake dyno I guess.

[ken seeber]

Keep those karts waiting on the start line for 30 seconds and the coolant in the cylinders will be boiling. Bring your own tea bag .

Frits, ha, ha, ha….very good. “Does sir take milk and sugar?”

But you’re right, axle driven pumps are a compromise. Yes on a direct drive, clutchless engine, such as earlier engines such as the 100 cc CIK, the popular clutched IAME 125 cc X30 and, even now, with the new 125 cc CIK OK engines they do preclude the cup of tea on the grid option, but at least there is some relationship between the pump and the engine rpms. The clutched Rotax Max engine does carry its own pump.

KZ engines run axle driven pumps, so the coolant flow in the lower gears will be relatively low.

Many a year ago when involved with the ARC water cooled kart engine (an Oz made engine that mimicked, with a high level of interchangeability and performance levels, the very popular Yamaha KT100S engine), I was involved with a water cooled version. At this time axle pumps were new. So we looked at an engine speed pump. This had a Ø22 impeller. The flow rate at 14k was really impressive. However it wasn’t adopted as the actual pump interfered with the seat stay tube on virtually every kart.

This was driven by the screw heads of screws that were fitted into the extractor holes of the ignition rotor.

[Flettner]

I posted a pic of Bert Monroes Dyno somewhere. that had over 6 feet of chain whipping around.
Neil could hook up the engine to his water brake dyno I guess.

I was looking at that in reality, the dyno. Either way it needs that clutch.

I've got the sleeve valve bug again, got a gearbox in it now. Need to make a clutch cover, cast or machine from solid? I have to say loading the gearbox in from the top (horizontal split cases) is way easier than normal AND you can check the gearbox by hand seeing the gears all engage smoothly.
Also have to make some exhausts, I've got a sheet of steel and intend to have a go at hydro forming an exhaust (or two).

[Flettner]

Gee, that sounds, um, slightly, you know? . . . dangerous?

Yes Dave I agree, Health and Safety and all that
All those Gyro's running up in my back yard with those ungarded props will have to stop now, they sure know how to take the fun out of life.