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OS46SF Diesel

Old 09-21-2014, 12:40 AM
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Default OS46SF Diesel

My homebuild glow to diesel conversion



https://www.youtube.com/watch?v=_g2SWA-D1Qw Greetings Jef
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Old 09-21-2014, 08:28 AM
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Good job with the head and contra piston for the OS 46SF
Old 09-21-2014, 12:03 PM
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I have one too. mine has a DDD head and a just engines piston & liner set it runs great .
Old 09-21-2014, 02:43 PM
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Nice work, Jef!

What RPM range were you getting? ...on which prop? ...fuel?

I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.

Very nice combo.

OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)

Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.

Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
Old 09-21-2014, 08:39 PM
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Where is your contra-piston sitting when adjusted for best RPM?

Up in the head? Or with some of the lower portion protruding into the chamber?
Old 09-22-2014, 09:58 AM
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Originally Posted by Lou Crane
Nice work, Jef!

What RPM range were you getting? ...on which prop? ...fuel?

I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.

Very nice combo.

OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)

Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.

Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
I have not be able to measure RPM , tachometer is broken , on the movieclip I have used a graupner 12 "x 6" , then I tried a 13 "x 6" APC and I think that was OK too , fuel = 25%casteroil / 30% ether / 42% petroleum and 3% ignition improver from Barhdall

Last edited by jef-lemmens; 09-22-2014 at 10:07 AM.
Old 09-22-2014, 10:04 AM
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Originally Posted by fiery
Where is your contra-piston sitting when adjusted for best RPM?

Up in the head? Or with some of the lower portion protruding into the chamber?
The bottom of the contra piston sits a little bit in up the head , about 0,5 mm
Old 09-22-2014, 10:06 AM
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@ w8ye and Lou Crane ,

Thanks for the compliments

Kind regards Jef
Old 09-22-2014, 07:34 PM
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One extra head gasket should get the contra-piston setting near perfect Jef. Well done.
Old 09-25-2014, 10:32 AM
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Jef,

Just checked some of my notes. I worked on the 46XF, not the FS.

Results sound similar. Still a good package!
Old 09-25-2014, 02:55 PM
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FX and SF?
Old 09-26-2014, 02:37 PM
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Right.

Double checked after your "PM."

It's been a while....
Old 09-26-2014, 10:06 PM
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Originally Posted by fiery
One extra head gasket should get the contra-piston setting near perfect Jef. Well done.
That's a good advice , thanks Fiery

Regards Jef
Old 12-14-2015, 11:47 AM
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https://www.youtube.com/watch?v=hteJH9vL_8Y
Old 12-14-2015, 03:37 PM
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Nicely set up. Well done.

Ingenuity with the 'shed friendly' goop minimisation as well .
Old 12-15-2015, 05:41 AM
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I have seen and met Dr. Diesel at Toledo, he runs the exhaust down into a bucket of water, works like a charm.
Old 12-15-2015, 11:30 AM
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Originally Posted by Dave, FormerDairyFarmer
I have seen and met Dr. Diesel at Toledo, he runs the exhaust down into a bucket of water, works like a charm.
I do the same thing if I'm breaking engines in at home. Makes a huge difference in noise. You just don't want the hose dipping into the water. That is if you're using muffler pressure to the fuel tank.

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