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#1
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How exactly do multifuel engines work? I always thought that some parts changes were required to run off a different fuel type for a multifuel engine -- but right now I am working on the Ukrainian T-72AG upgrade, and on the global Security.org web site, I found the following:
"The engines in question are two-stroke multi-fuel liquid-cooled diesels with straight-flow scavenging, with horizontally-placed cylinders and opposed pistons. Both the 6TD-2 and 6TD-1 will run on various fuels including diesel fuel, petrol, kerosene, jet engine fuel (or their mixture in any proportion)." (Italics are mine.) So apparently, you don't need to change any parts, at least in the 6TD-1 and 6TD-2 engines. Is this peculiar to the 6TD-1 and 6TD-2? Is it the result of new technology? Or is this actually the way multifuel engines have always worked?
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I'm guided by the beauty of our weapons...First We Take Manhattan, Jennifer Warnes Entirely too much T2K stuff here: www.pmulcahy.com |
#2
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IIRC in the original V2 rules any engine which listed all fuel types as usable could burn any fuel without any modification. Also, again IIRC, in Team Yankee there is a part of the book where the company of M1's gets refuelled with JP8 jet fuel and mention is made of improved performance, but no mention is made of whether any maintenance was required to use it. How this compares to real life though, I'm not sure.
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Chuck Norris can kill two stones with one bird. |
#3
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Please indulge me if I seem to be teaching people how to suck eggs, a little bit of theory behind internal combustion engines is needed here. Please forgive me if I get it a bit wrong, I'm trying to remember this from lessons I was taught many years ago with a few quick peeks at some books to try and refresh my memory
Petrol/Gasoline engines use a highly volatile fuel, they work by pumping air into the chamber and the fuel is dragged along with it creating a fuel-air mixture which is then ignited by the electrical spark causing it to basically explode for want of a better term. The resultant combustion causes pressure that forces the piston to move. The proper mix of air to fuel is important to prevent unburnt fuel from being dumped via the exhaust system or too much fuel flooding the chamber. Later engines use fuel injection, forcing an aerosol of fuel into the airstream. Diesel engines work by compressing the air in the chamber to superheating (typically 550 degrees C or more) then injecting the fuel in very fine droplets. The heat of the air causes the fuel to vapourise. The vapour then burns and thus builds up the pressure and forces the piston to move. Because of this, any mix of fuel can be dumped into the same fueltank and the way the engine works will ensure the fuel burns. Unfortunately if the two fuels don't mix well, a slight delay can occur in the cyclinder when changing over to the other fuel type (typically the lighter fuel gets used last as the heavier will be the first to enter the fuel line due to gravity) Multi-fuel diesels don't use any new technology, they revert back to the original technology which was crude enough that it didn't need any changes to be made to the timing cycle to allow it to burn any suitable fuel. Early diesels used a glowplug to start the initial combustion cycle now they tend to use electronic ignition. From what I understand of it, the more sophisticated diesels (e.g. electronically controlled injection and electronic ignition types) are more sensitive to fuel differences and require timing changes to ensure correct piston height/compression to control air temperature and so on when the fuel is introduced. |
#4
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Then there is the third common type of modern engine - the turbine engine such as in the Abrams.
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#5
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IIRC from 30 years ago, the multifuel duces and five tonners had a switch on the dash to change from diesel to mogas, but I could be very wrong.. I was a leg and only rode in them, never drove or maintained one. I do know there was never modifications necessary to change from fuel to fuel, other than perhaps the foresaid switch. I wonder if that was to turn off the electrical for non diesel operations?
I DO know that it is detrimental to put gas in a regular diesel engine, as it WILL run away... had a neighbor whose hired man filled the diesel with gas (had two tractors of the same make/model except on was gas, one diesel.. hired man usually ran the gas one, but that day was running the diesel.. latem tired, and not thinking caused him to fill the near empty tank with gas) the thing started right up and then kept increasing in engine speed until a rod came thought the side of the block... it took almost NO time for it to do so either. That was back in the early 60's. |
#6
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I'm guided by the beauty of our weapons...First We Take Manhattan, Jennifer Warnes Entirely too much T2K stuff here: www.pmulcahy.com |
#7
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#8
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![]() I'm afraid I know nothing about how multi-fuel engines work, although I'd like to. About the only thing I know is that the Chieftain's multi-fuel L60 engine was so unreliable that questions were asked in parliament about it. Last edited by Ironside; 12-01-2009 at 12:01 PM. Reason: i before e except after c D'oh! |
#9
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#10
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![]() No need to precise that everyone around me made fun of me. At least until my step father made the same mistake: filling a BMW M5 tank with diesel. He has been the only guy I know with a diesel sports car. ![]() ![]() |
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