petroleum - derived hexane is a good solvent for vegetable oil.
petroleum - derived hexane is a good solvent for vegetable oil.
what is a good solvent for vegetable oil?
petroleum - derived hexane
Na
Na
the engine, because it is indirect injection, with a slower combustion burn time than direct injection, is suitable to run on svo (pure vegetable oil). a feature of the ricardo comet pre-chamber design is that it makes the engine tolerant of low cetane value fuels such as svo. the viscosity of vegetable oil when cold is too great for rotary injection pumps, (in particular the weaker lucas cav pump, the bosch ve fuel pump is superior), preventing it from acting as a lubricant and increasing the workload on the distributor/rotary injection pump and damaging it. the lucas epic pump fitted to the 2.1 l 12 valve turbo-diesel engine after 1995 is the weakest pump of all. different fresh vegetable oils have different viscosities: thinnest are; sunflower, rapeseed (often only labelled vegetable oil, but with pictures of distinctive yellow flowers), then soya and corn oil, but palm oil (may be only marked vegetable oil) is thickest and may be solid at room temperature. vegetable oils thicken when used for cooking, so used oils can be much thicker than any fresh oil, they may even solidify at room temperature. it is necessary for used oil to be very well filtered (ideally cold filtered to 1 micron), to avoid filter plugging and/or injection pump damage. heavily used oil may be highly acidic and corrode the inside of the injection pump. such oil can only be used as fuel without the risk of damage, if it has been chemically processed into bio-diesel. the open market price for used oil is often quite close to special offer supermarket prices for new oil, which can be used straight away. in order to reduce the viscosity of the svo, it should be heated to engine coolant operating temperature, typically with a two tank system, in order to start and shutdown on diesel or bio-diesel. versions of this engine from the early '90s onward, are typically fitted with a peugeot-type coolant heated fuel filter that helps heat fuel and reduce viscosity. fuel / engine coolant heat exchangers, usually required for straight vegetable oil conversions, are still needed for long term life expectancy, or there will be accelerated wear of the fuel injection pump. heated vegetable oil is a good injection pump lubricant. this is especially important in cold weather ambient temperatures. mixing with major oil company brand diesel, (which in winter is thinner and contains anti-waxing winterising agents) to thin the vegetable oil fuel, choosing a thin vegetable oil, winterising additive, or electric heating, or a combination of these are helpful especially when starting and warming up, as coolant heating will not yet be at operating temperature. the difference between the use of good quality fuel and supermarket diesel, in a diesel / vegetable oil fuel mix, will be very noticeable, especially at lower temperatures. the fuel systems used on this engine return heated fuel to the fuel tank. running with half a tank of fuel instead of fully filling up, will allow the tank to be heated more effectively by this warmed fuel in low ambient temperatures. due to different calorific values some oils will give less mpg and some more.
psa xud