Light weight diesel auto conversion

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osprey220

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May 28, 2018
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I'm very interested in making this engine work for my KR2s.

Scot is asking $5K each and has 34 of them.
They are almost bare engines (as pictured) and will need wiring and plumbing - so not a small project. But its been done before: FlyEco - Innovative drives for Ultralights

Anyone want to do this together? (divide and conquer)?

Cheers,
Owen

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rv7charlie

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It certainly *looks* attractive, and the price *looks* good, except for the fact that there's no controller. Are they actually flying on military drones? For how many years?

Don't forget that liquid cooled engines need a lot more stuff around them than air cooled engines. Don't be surprised if it takes another 30-40 lbs of 'stuff' to make it fly. I like liquid cooling (rotary going in an RV7), but one has to be realistic about adding up all the weights required.
 

Yellowhammer

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The 793cc, all aluminum diesel engine from Suzuki develops 47.6 PS of power and 125 Nm of torque. The diesel engine weighs just 89 kgs.
Or 196.2114 pounds.
Read more at:
Maruti to launch smallest 800 cc diesel engine
 
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Yellowhammer

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Born In Alabama, reside: Louisiana (unfortunately)
800cc diesel engine with gearbox
China 800cc diesel engine with gearbox wholesale

ModelR2V840R2V870
TypeV-twin, 4-stroke, air-cooled
Rated power (kW)11121213
Rated speed (r/min)3000360030003600
Max. torque (N.m/r/min)41/260045/2600
Fuel consumption (g/kW.h)≤ 270≤ 280≤ 280≤ 280
Displacement (mL)840870
Lube oil capacity (L)2.7
Lubricating wayForced & splashing
Noise at 7m (dB)≤ 86
Starting wayelectric
Rotation direction at output endcounter-clockwise
Net weight (kg)59
Net Dimension (LxWxH)(mm)550*391*459


Place of Origin :china
Brand Name :PH
Model Number :281
Type :Diesel Engine
No. of Cylinders :2 Cylinder
Dry Engine Weight; 127 pounds
 

TFF

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A fuel shutoff will kill it fast. Once fuel
Can’t move forward it will stop flowing in the injection pump. Pretty much how diesels are shut down.
 

PMD

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@osprey220 - A few years ago, Superior was showcasing a very nice looking 3 cylinder opposed piston diesel called the Gemini. If enough people want something like this, maybe it could still happen.
As I recall this engine wasn't fully developed and the new owners of Superior ran into serious crankshaft problems with some of their spark ignition engines and bought a lot of them back. Probably slowed them down a lot.

Worth noting that virtually every new design of certified engine is a diesel. However, 4 cycle (SMA) and auto conversions (Thielert, Austro) are HEAVY. Only 2 cycles can be expected to give the power/weight ratio needed to be a successful CI replacement for SI. Only the 600HP RED gets down to these numbers with a 4 cycle.
 
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Voidhawk9

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Not really. In the right (wrong?) conditions, engines can continue to run uncommanded - diesel is not too far removed from oil, so if enough of that can get into the cylinders...
I've seen an SI engine (in a car) continue to run after the ignition was switched off. Not well. And it was a little bit on fire. And it had just been terribly abused. But it did continue to run until strangled of air.
 

TFF

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I once drove a 65 Vette a 100 yards on a dieseling engine with the ignition off. Still unrelated. If your engine is so blown up that it can run on crankcase oil, don’t you think you are way above worrying about a runway engine. In fact I would rather let it runaway and fly it into the ground with power than be a glider. We would be on the path to total the plane anyway. I would rather be able to get it to an airport.

For runway diesels, a friend was rear ended while sitting at a light by a stoned kid in a van at 80mph. No skid marks. His old Mercedes wagon was sandwiched. It broke the linkages and it broke the hood release to pop it open , so no hitting the kill lever. He watched it runaway until fuel was gone. The impact ruptured the tank and put the contents on the ground in one second. If your engine grenaded enough to not have control, why would you think an air shut off would still work? If the engine was so worn that you are flying it where it runs on engine oil, don’t you think you are about ten years past your overhaul? I don’t think these are normal issues if we are not flying crap.
 

TiPi

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There have been cases of run-away diesel engines with mechanical governors. If the right part in the governor fails, the fuel delivery will stay on max until there is no fuel left or not enough engine left to keep running. Much less of a risk with electronic governors or common rail.
 

Chris Matheny

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I thought the turbo had a lot to do with the engine running away?
This can happen. If the oil seals go out in the turbo and it sucks oil into the compressor side, it can run away on the oil. A solenoid shutoff for fuel does nothing in this situation. An air shutoff is the only way to stop it at that point. When I was in sled pulling they mandated us to have a spring loaded air shut off held open by a handle in the cab for this reason. We were also pushing the mechanical pumps to the point they would sometimes not return off the limit springs at the end of a run. We had one do this and the datalog showed 7400 rpm at the point the air shutoff was engaged.
 
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