franchi

Hello All:

I recently purchased two MVVS Diesel engines. They are a 1.5 and a 2.0 cc in size. The instruction that were included with the engines specified a 45% ether content in the fuel. Why does MVVS state that such a high percentage is required? I have not tried this mix yet as I have been running a 30% mix of ether. Would 45% ether make starting easier?

Tia,

Franchi

Ployd

I have read that also and in the light of what we know the 45% mix would be a waste of ether, furthermore I would venture to suggest that the ingredients listed would be more for local consumption (in the Czeck republic).
I would use 30 ether, 45 kerosine and 25 castor (not synthetic) and have done so for both the 1.5 and 2.0cc engines. It isn't rocket science.
Ployd in OZ

franchi

Hello Ployd:

Have you had any experience with a Diesel fuel containing 45% ether? If so, what were your observations?


Franchi

1QwkSport2.5r

The engine will make less power. It should however start easier and throttle better if R/C equipped. The old Drone engines with their fixed compression heads ran a mixture of ether and IIRC 70wt oil only. No kerosene. Not very powerful, but they ran.

qazimoto

My Feedback: (1)

I vaguely remember that the MVVS recommended fuel mix didn't include any Ignition Improver and that the extra Ether was meant to replace it. Perhaps Cetane Improver was difficult to obtain in Soviet era Czech society. As Ployd said above, "it ain't rocket science".

Ployd

Hi Franchi.
I have never used 45% ether in my fuels but do use 30% in my 0.25cc engines only as they require a bit more help to start. For sure the engine will start easier (for a beginner) but if you read your instruction sheet you will see a second fuel formula for general running which recommends Amyl Nitrite as the ignition improver.
Personally, for running in a new engine the tried and true 33/33/33 mix is the way to go then switch to less caster and ether and more kero.

Ployd in OZ

franchi

Hi Ployd:

Thanks for the replies!

Franchi

1QwkSport2.5r

Amyl Nitrate is not easily obtainable in the USA; most guys here that mix their own fuel use Amsoil Cetane Boost which is 2-ethylhexyl nitrate which is very similar to amyl nitrate. I have a small bottle (12oz I think) that will last for a LONG time. 2% in a quart amounts to about a capful or so.

qazimoto

My Feedback: (1)

Most people all over are now using the Amsoil as a Diesel Ignition Improver (DII). The percentage depends on the Cetane level of your oil mostly. I use 14 ml per Litre of mixed fuel. It works very well. Our local kero is of quite good quality. So we don't need so much. Before the Amsoil we could get Iso Propyl Nitrate (IPN) and the pure 2-EHN. Interestingly Amyl Nitrite has been taken off the dangerous list and is now theoretically available from Australian Pharmacies. There seems to be some confusion with the press as to whether the chemical is Amyl Nitrite or Nitrate. I'll assume the former.

Amsoil apparently works just as well as a Cetane Booster, according to locals who have tested both it and Amyl Nitrate, so there's no need to use the others. Amyl Nitrite needs to be be used in higher percentages to be an effective DII. It was quite easy to get when I was a kid.