Replacement engine for Mercedes D3a

franzkait · 26 August 2006, 04:12 PM

I think we have a misanderstanding, with the parts I have, I can not make 10.
But about this demand for 50, who need one ?

Machinbird · 26 August 2006, 07:00 PM

Franzkait, sorry if I misunderstood you. Once I save up a few more pennies in my piggy bank, I might need one.

franzkait · 27 August 2006, 04:02 AM

this is the problem $$$ ! look how many build a plane , and how many have an engine ? to get steel tubes and plywood is one think but an engine..........
this engine converted ready to put in an aercraft is over 20 000 $. prop hub 2500 $ prop 3500 $ . If you can find one for 5000 $ , just the parts are over 5000 $. and it is not so easy to convert this engine . and some people are building 2 and moore aercraft and have not an engine ! this is reality , but maybe there are still some rangers for 1500 $

franzkait · 4 October 2006, 12:25 AM

the engine conversion to have the cylinders up is 95% ready , but to get it nice in the D7 fuselage need special made engine mounts and other parts.

jumpinjan · 4 October 2006, 02:34 PM

Franzkait,
How did you solve the oiling to the upright cylinders? None of the inverted 4-stroke aircraft engines, that I have explored, have any oil rings. Also, long stroke designs (w/upright cylinders) need some aid in getting oil up against the piston head? Some long-stroke designs that I have seen, actually point a stream of oil up to each cylinder with an oil sprayer. I'm curious & not complaining.
Jan

franzkait · 4 October 2006, 04:37 PM

piston has oil rings. can you see the 2mm hole in the con rod , this hole is spraying oil inside the piston.

franzkait · 4 October 2006, 04:39 PM

-----------------------------------

jumpinjan · 4 October 2006, 05:20 PM

Where's the oil ring. I see one scraper (very bottom) and two compression (on top)? 3-rings which is very typical of inverted types.
The oil weep hole is located on the camshaft side on all engines , to throw oil on the cam. I wonder if it can put out enough stream to reach the piston head? I hope it doesn't run hot?

franzkait · 7 October 2006, 03:20 PM

The bottom ring is not only one ring, 3 rings in one gruve with a spring at the back. To throw oil at the cam ? or in to the piston head ? what engines you are talking about ? maybe this cast iron boat ankers ?

jumpinjan · 7 October 2006, 04:05 PM

Sorry, I couldn't make it out that was an oil ring in the picture.