why waste vegetable oil cannot run in petrol engine?
Question by YONG: why waste vegetable oil cannot run in petrol engine?
I acknowledge it can run in diesel engine, why not petrol engine? In the future, can it be run in petrol engine?
Best answer:
Answer by Sarah
Its because whenever you put oil over a plate and use matches to light it up it would not. But whenever you put petrol in a plate and light it up it is about to catch fire, I think the reason is that petrol converts to gas that burns at a lower temperatures compared to oil that haves much method higher temperature to convert to gas and and then burn.
Ok I have no acknowledgeledge about engines some nevertheless as far as I acknowledge diesel engines work based over compression, like there is not all sort of of spark and the entire to create diesel burn, its just the compression that set it ablaze. It works comfortably goes along with oil I guess, because petrol engine have like compression of 1:10 or something and diesel has like 1:25 or something, some nevertheless I’m not certain.
What do you think? Answer beneath!
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diesel and petrol engines have different systems- it’s like a square block and a round hole.
WVO will never run in petrol engines, just like diesel will never run in a petrol engine. An engine set up to run on petrol will have compression of about 10:1, at which point the fuel is ignited with a spark. If the fuel auto-ignites from compression (detonation) that can cause serious damage. Gasolines are rated by Octane, which means the fuel’s resistance to auto ignition. A higher compression gasoline engine–say a race car with a 12:1 compression ratio–would need high octane gas.
Diesel has an otane of about 15. It auto-ignites very easily. But in a petrol engine it probably wouldn’t burn at all.
Diesel fuel and vegetable oils require compression of about 22:1. These engines are intended to run from auto-ignition, the difference is the fuel is added *after* the air is compressed.
There are a few companies working on variable compression engines by moving the cylinder head further away from the crankshaft. It is possible that, at some point in the future, an engine will be built that can run on either diesel or petrol. If so, that engine would likely also run WVO. But this is far off in the future.
no it cannot.
for one thing, it’d mess up the carborator.
but the real problem is the compression ratio.
diesel engines have a much higher compression ratio.
when you design an engine, what you want to do is compress the fuel so it’s about to self ignite.
if you use regular octane in a high compression gasoline engine, you get knocking.
that’s caused by self ignition, before the spark, before the cylinder is at the top of the stroke.
when it’s working correctly, the spark ignites the fuel near the plug, but that causes additional compression, which ignites the rest of the mixture.
in a diesel engine, there is more compression.
a gasoline engine is around 10:1
a diesel engine is around 16:1, and higher.
that makes the engine able to produce more power.
but the engine must be made stronger to withstand the added stress.
it happens that vegetable oil self ignites at about the same temperature as diesel fuel.
that’s why they are compatible, and why veg-oil will not work in gasoline engines.
Most people got the gasoline requires a spark to ignite and that compression ratios of 8 to 1 to 12 to 1 is norm, well, not exactly, to have a 12 to 1 compression ratio, you’d need 100 octane fuel and unless you have acces to 100LL airplane fuel, that ain’t happening. so, the top compression ratio for normal cars we all drive is 11 to 1.
Diesel must use the heat of compression so they run 16 to 1 up to 22 to 1 in most cases, again, getting over 22 to 1 is not normal.
But here is where you all fail. The Otto cycle, google that if you don’t know it, has a peek efficency at 13 to 1, in otherwords, the farther away from peek compression, the lower the efficency. As it turns out, a 8 to 1 gasoline is less efficient than a 16 to 1 diesel, but a 11 to gasoline is more efficient than a 20 to 1 diesel. Here is the most efficient engine in the world, look what it is, a spark ignition.
GE Jenbacker
http://www.ge-energy.com/prod_serv/products/recip_engines/en/j624_gs.htm
Look up the ignition temperatures of petrol vs diesel / vegetable oil. Also compare flash points of all three.
There is not enough compression in a gasoline engine to lower the combustion point of WVO down to where it can ignite.
Simply increase the compression to about 20:1 and take off the spark plug wires, adjust the timing and voila! You have yourself a diesel engine.
Unfortunately, your gasoline turned diesel was not designed to be strong enough to handle that kind of compression so it won’t last very long at all.
However, old diesel engines converted to gas makes excellent race engines.