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Merco .61 R/C diesel

Old 01-10-2015, 08:39 PM
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fiery
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Default Merco .61 R/C diesel

One of the last. ABC metallurgy. 13 x 6 RAM prop fitted. Smooth throttling with low vibration. Easy to hand start with a generous intake prime once you have the procedure. Six to eight flicks and it bursts into life.

The R/C throttle carburettor works well. 'Wick' type spray bar with air-bleed. As expected intake is conservative. The diameter of the rotor barrel is 6 mm.

I have not yet adjusted carb. or engine for maximum performance.
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Old 01-10-2015, 08:43 PM
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fiery
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Video:

https://www.youtube.com/watch?v=y65p...aDm-zA&index=2

https://www.youtube.com/watch?v=dcEV...aDm-zA&index=1
Old 01-11-2015, 06:00 AM
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Very nice. I have a Merco .61 on a Mighty Mambo. Obvious differences between the two engines. Enjoy.

Happy New Year.

Sincerely, Richard
Old 01-11-2015, 02:30 PM
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I have a.29 have to find a plane for it geat runner.
Old 01-11-2015, 03:30 PM
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Overall I like it. However its 'feel' is very different to a 'traditional' large diesel such as the PAW .60. It does not 'talk' to you to the same extent. When flick started it will 'burst into life' with little forewarning.

The engine shown has a slight leak between the cylinder flange and the head. Honey coloured castor oozes out as it runs. Merco never used a head gasket on the .49 / .61's. So fits here need to be perfect. This one is not. I will make a gasket up for it.

Bottom end showing bronze bushed rod and 'anti-rust' coated counter balanced crank web.
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Last edited by fiery; 01-11-2015 at 03:33 PM.
Old 01-30-2015, 05:24 PM
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I have investigated the problem and I am reminded again never to make assumptions.

This engine does not have the contra-piston in the head; but rather its brass contra-piston is in traditional configuration, that is, located within the cylinder.

Therefore, weepage of fuel/air mixture or exhaust efflux must be either be flowing up the cylinder exterior and out under the flange, or blowing by the contra piston. I believe it is the former; as there is close to nil oil weeping from the compression screw hole. I could make a thin alloy or copper crush gasket to fit under the flange to seal it up. Then again, I don't really want to alter the timing, or upset the piston/liner fit, which is very good to exemplary.

It is a minor annoyance, and the engine runs cleanly compared to some others I have.

Last edited by fiery; 01-30-2015 at 05:32 PM.
Old 01-31-2015, 04:17 PM
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Great find Derek. Edward Carlson at Carlson Engine Imports told me about 10 years ago that he had one of those somewhere. He never let me know whether he found it or not.

PS, his website is still up, might be worth a check to someone.

http://carlsonengineimports.net/

Last edited by Hobbsy; 01-31-2015 at 04:22 PM.
Old 02-01-2015, 01:16 PM
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I wonder if a thin ring of solder around the outside of the cylinder would help seal things a bit?
Old 02-01-2015, 02:57 PM
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Possibly, but I would prefer to have no unstable foreign metals in the engine.

A further idea. I have a compass cutter somewhere. I am now thinking of cutting a ring of 0,2 mm oilstat gasket paper the same OD as the flange, with ID the same as the cylinder OD. Slip it over the cylinder from the bottom to but up against the underside of the flange. Could result in a simple and effective solution. If the cylinder is a 'slip fit' I'll do it. I am reluctant to apply localised heat to that black anodise casing ...

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