What is the COX 049 Diesel?

Deerej18 Fri Jun 09, 2017 10:08 pm

What is the difference in fuel for the Diesel? Do you legit use Diesel fuel?

Mark Boesen Fri Jun 09, 2017 10:26 pm

https://www.google.com/search?q=model+airplane+diesel+fuel+formula&oq=model+airplane+diesel+&aqs=chrome.4.0j69i57j0l4.11138j0j7&sourceid=chrome&ie=UTF-8

Oldenginerod Fri Jun 09, 2017 10:56 pm

Plenty of choice in Mark's link, but to cut a long story short, general rule is 1/3 kerosene, 1/3 castor oil & 1/3 ether. Some add a diesel ignition improver as used in trucks, but this is not all that necessary. Diesel fuel as used in vehicles etc is not used.

Standard lamp kerosene is fine but many use Jet A-1. Either or. Ether will be the hard ingredient to source. If you can't purchase it locally then you will need to search through all the posts in Mark's link. Generally a controlled substance around the world these days.

Rod.

Mark Boesen Fri Jun 09, 2017 11:07 pm

i think starting fluid is either, you can buy a spray can of it almost anywhere.

Oldenginerod Sat Jun 10, 2017 4:00 am

Mark Boesen wrote:i think starting fluid is either, you can buy a spray can of it almost anywhere.

They all have different % of ether. You need the highest you can get. Apparently John Deere is 90%. The other 10% is probably just propellant so if you invert and spray off the propellant you should be left with almost straight ether.

Because of our aussie climate we don't need such high concentrations. The best I've found here is (Master) 50%, meaning that you have to take into account the amount of other products in the mix. Main other ingredient is Heptane which should be considered as part of the kerosene %. It gets complicated. Go for the John Deere product if you can't get pure stuff elsewhere.

roddie Sat Jun 10, 2017 9:55 am

I have also heard (as Oldenginerod-Rod mentioned..) that John-Deere branded ether is a good choice. You likely have a JD-dealer nearby.. but you may need someone 18 years+ of age to purchase it. I'm not sure about that.. but ether is hazardous. Be sure to read about how to handle it safely BEFORE you even buy it.

Ask more questions "here".. concerning the safest way to extract it from the can. Some methods have been discussed previously in other threads too. I'm sorry I can't offer more information.. but I've never mixed model-diesel fuel.

Ken Cook Sat Jun 10, 2017 10:16 am

The safe way is to purchase it made. Tower Hobbies sells Davis Diesel and Davis Diesel can also be purchased direct through Davis himself.

Deerej18 Sat Jun 10, 2017 10:24 am

Ok thanks for the info guys

Oldenginerod Sat Jun 10, 2017 5:59 pm

Ken Cook wrote: The safe way is to purchase it made. Tower Hobbies sells Davis Diesel and Davis Diesel can also be purchased direct through Davis himself.

Of course, that's a better choice if you have it. I'm speaking from the prospective of a country that has no pre-made diesel fuel available.

Ken Cook Sat Jun 10, 2017 6:09 pm

Rod, I posted my response in regards to the age of the original poster.

roddie Tue Jun 13, 2017 9:26 pm

I hope that we hear some more on this. I have a diesel conversion-head and heavy-duty crankshaft for the Cox .049 reed-valve engine. I'd like to give it a try some day.

Surfer_kris Thu Jun 15, 2017 4:25 pm

For someone new to diesel engines I would strongly recommend commercial fuel and a dedicated diesel engines. The Teflon seal on the Cox .049 engines is a bad idea and home-made fuel can only make it worse...

So get a PAW .049-.061 or the PAW .09, they are real smooth runners and easy to operate. You still need proper fuel though.

Or if you are really acing to convert a cox engine, use the RJL diesel-conversion heads (from Mecoa), they work well.

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