Hi
I need some advices
I have MVVS 61 DFS- diesel The contra piston clossed to the end if I try to open it, it sound not good and the rpm goes down even I change the needle.
When I try to close the needle it rpm goes down.
The best tuning I get is when the engine vary to maximum rpm and then go down back and force
it not stay at full rpm (screaming)
I try prop 14x6 and 13x8. At 13x8 I get 8100 rpm but the sound is not steady screaming (rpm goes up and down)
Thanks
Barkai

You should get full rpm at about 3/4 thottle only wide open on a glow carb any diesel will wander in rpm prop size on on the money
my Irvine 53 donversion will do the same thing if running wide open the engine does not need that much fuel as presnented at a wide open setting I do not thing wou need a carb restricter that engine is shipped with the glow carb larger venturi martin

Thanks
I will try and come back
I can limit the carb by the transmitter (9CAP)

Yuval.


This sound somewhat like the trouble I went through, with my MVVS/AJC .49...

...That is, until I used the fuel that you brought with you... Everything became OK with that fuel.
That .49 held a steady full throttle with the same 7 mm #3216 carburettor that you have on your .61DFS.

Are you sure the fuel formulation you are using, is exactly the same as the one you had with you then?

Hi DAR
Yes this is the same formula and I try to increase the Ether to 42% but no improve
Thanks

Yuval,


I cannot think of anything mechanical that could affect an engine this way.

Does the compression seem to be OK?

Are you running your engine with Diesel fuel, or with kerosene?


It seemed to be OK earlier.