|
Motorboy -> RE: auto diesel versus kerosene versus jet fuel (2/26/2004 8:06:43 PM)
|
Diesel are heavier than kerosene, but it has better lubricating than kerosene. Heavy diesel oil for ship to example has more sulfur than light diesel (Auto diesel fuel).
In Norway we use winter diesel has mostly kerosene added in diesel to improve starting in cold weather. In russia they adding 10-15 % gas (petrol/benzine) in diesel in winter, some people are running dieselengine and use only kerosene with 10% 2 stroke oil added to lubricate dieselpump and parts in injector in winter.
Auto diesel fuel (both summer/winter) can not damage modelengines.
In our model dieselengines running without problem when we use auto diesel, kerosene, lamp oil, smokeless lampoil, jet A1. Very important fuel has 20-33% oil added to lubricate moving parts.
quote:
Next question is oil content. The 1/3rd formula means 33% oil. I've always wondered why so much oil?
In early days we had much oil cause tight parts when running in new diesel engine and to improve sealing between piston/sleeve in case bad compresion and cool down engine. 33% make overlubricated modelengine and more waste oil. I has tried 20% oil both at dieselconverted engines and original diesel engines without sign to wear out parts.
Before all peoples thinked the modeldiesel engine must be tight and have very good seal between piston and sleeve and has talked pistonring was impossible in miniature diesel engines. Now we know the engine run well with piston ring without problem (piston ring more leak than lapped piston/sleeve). 20 % oil are enough to lubricate engine instead waste oil and less dirty airplane.
In my 4 stroke engine are 20% enough because engine are running between 8000-9000 rpm and not running hot. I can see oilfog come from breather nipple.
Jens Eirik
|
|
|
|
