Propane engine questions

[SRadke]

I need to know a little more about a the fuel delevery system on a propane engine. Automotive type applications specifically but if you know forklifts or generators, speak up. I'll take what I can get.



Specifically I need to know how the fuel is metered and properly proportioned with the air to create the proper mix ratio and volume required for the power demand. Can anybody help me? TIA



-Scott

 

[B.G. Smith]

This might help. bg http://www.wps.com/LPG/

 

[SRadke]

Thanks BG. I don't have time to follow all the links tonight but that may just do the trick. I'll check it out tomarrow.



-Scott

 

[RustyJC]

Gaseous fueled engines can either have fuel injection or carburetion systems. The fuel injected engines can be either direct injection (fuel is injected directly into each cylinder) or indirect injection (fuel is admitted to the intake port of each cylinder and mixed during the intake stroke). On these fuel injected engines, the governor controls the fuel manifold pressure, admitting as much fuel as is required to maintain engine load and/or speed, and air/fuel ratio controls regulate air manifold pressure to correspond to the fuel manifold pressure, thereby ensuring correct air/fuel ratios.



The carbureted gaseous fueled engines operate very much like a carbureted gasoline engine in that the carburetor matches fuel to airflow to obtain the correct air/fuel ratio. Impco is probably the leading supplier of gaseous fuel carburetors and systems.



Rusty

 

[SRadke]

Thanks Rusty. My main concern at the moment is with carbureted engines ie, something I can fiddle with easily. Also more along the automotive line where there is no govenor (or it's set really high) and the engine must react to changing load and throttle levels. If what I understand what I've gathered from other sources they meter the fuel based on ventury (sp?) vacuum. What I really need is a carburetor in my hands so I can see how it works.



-Scott

 

[RustyJC]

Scott,



10-4. The stuff about injected engines applies primarily to turbocharged large industrial engines (hence the governor) and was provided primarily for information. The Impco carburetor works sorta like a regulator - a diaphragm and spring regulate gas pressure at the point of mixing against venturi depression (negative pressure, or vacuum).



Rusty