The Bucket Foundry

[husaberg]

Jonsered 910 CYLINDER (below)

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[WilDun]

Been away for a couple of days and I see the thread is progressing. Neil, glad to see you're at it again, don't wear the bloody thing out before its time though! will be watching with interest, ie the sleeve valve engine.
As usual , I intend to give my furnace a whirl this weekend ie. if family stuff doesn't once more take precedence!

[Flettner]

Water pump and drive, keyed end is for the one way starter clutch.

[husaberg]

Water pump and drive, keyed end is for the one way starter clutch.

Can you post a pic of the core you use for the crankcase mouth I don't think I have ever seen that only the outer ones for the Reed Tunnel.
Guessing they fit together and that's why the pattern for the tunnel extends so far.

[Flettner]

there is only one core for the reed holes ( two used per crankcase ), the crank case cavity is just part of the bottom section of the mould. This case is made with six hard sand parts and two cores, four sides, one bottom and one top. Curved part of the core matches the inner crank case sand "lump".
I was going to take pictures when I was moulding this case but my camera's batteries were flat.

[Flettner]

Case machined with reeds installed. There is no machining required inside the reed cavity but there is some blending still to be done where the reeds lead into the transfers. This will be a CNC job.

[husaberg]

Case machined with reeds installed. There is no machining required inside the reed cavity but there is some blending still to be done where the reeds lead into the transfers. This will be a CNC job.

Your Sleeve motor etc top of crankcase pattern is quite different? But same reed tunnel?

Edit I figured it out you needed the space for the gubins to raise and lower the sleeve next to the crank

[Flettner]

Your Sleeve motor etc top of crankcase pattern is quite different? But same reed tunnel?

Edit I figured it out you needed the space for the gubins to raise and lower the sleeve next to the crank

Yes same reed tunnel because I aready had the core box and I figured the sleeve engine might need some airflow, assuming it makes some power. This reed tunnel is also big enough to run the 24/7 reed system I want to try out later.

[Flettner]

Yum, NZ Cylinders nikasil.

[Flettner]

Yuck, LPG fuel, Impco gas carb. I have to admit that I did not think this would work at all but todays run showed 6200 RPM ( 6500 on petrol ), I was wrong as this system will work well enough to power a Heat Ranger. RD Yamaha oil pump, thanks to Yow Ling and Wobbly.

[Flettner]

There we go, running on a BBQ bottle.

[F5 Dave]

You're an absolute magician.

[Grumph]

I'll be interested to see how the LPG motor holds up with some time on it. Historically, LPG used in 4 strokes doesn't have a good record for engine longevity as it tends to dry out valve guides etc. It should actually be better suited to 2 strokes particularly with pump lubrication.

[Flettner]

I'll be interested to see how the LPG motor holds up with some time on it. Historically, LPG used in 4 strokes doesn't have a good record for engine longevity as it tends to dry out valve guides etc. It should actually be better suited to 2 strokes particularly with pump lubrication.

Yes, I'm not to sure what will happen with LPG long term. I have the centre main bearings in gearbox oil, outside bearings can be shifted on future engines so all the mains can run in their own oil. Only big end and cylinder to need the oiler then. I imagine I'll run this thing for a while on LPG then pull a cylinder and see whats happening. I was supprised how smooth the engine ran on LPG.

[Frits Overmars]

Historically, LPG used in 4 strokes doesn't have a good record for engine longevity as it tends to dry out valve guides etc. It should actually be better suited to 2 strokes particularly with pump lubrication.

I started converting my cars to LPG in 1975. I never changed compression ratios, ignition timing, valves, valve seats, valve guides, etc. Spark plugs lasted 100.000 km.
Over the past 40 years I had 8 cars that together did about 800.000 kilometers and I have never had any LPG-related problems.
I think the main reason for LPG-related problems is greed. People tend to set the mixture too lean, although the stuff costs next to nothing.