I"M a NEWBE !! what makes the fire on compression stroke ???

[1 locomotive]

OK GUYS !! I can build a chevy gas engine & understand how it runs !!! but this cummins diesel !! wow !! what makes the spark for the compression stroke ??? what starts it when It"s cold ?? dodge has on glow plugs ??? also what good books are out there on a 92 cummins ?? one that can explain how to pump up the diesel ?? I have lots of ??????? thanks for your time !!! 1 LOCOMOTIVE OUT !!!

 

[sparks57]

Compression alone ignites the fuel. There is much higher compression in a diesel motor, and the diesel is squeezed so hard, that the molecules rub together and ignite themselves.



The cummins does not have glowplugs, it has a grid heater.



Go to a dealer and get the shop manual. It has everything you need to know about our trucks.



In terms of souping them up, go to the "bombing guide", it is a sticky on top of the post list.



Hope that helps.

 

[Bob Beauchaine]

With a compression ratio of about 17 to 1 the air on the compression stroke is heated to about 900 degrees. At the precise moment (timing) fuel is introduced and a controled explosion occurs and you go rolling on down the road.



Bob

 

[sparks57]

Does that mean I am wrong? I was always told the compression ignited the diesel...

 

[Turbo Tim 1]

CB, you are right it is compression, the "heat of compression"

 

[Greenleaf]

The diesel engine also burns it's fuel over a longer period of time[deg of rotation] as compared to a spark ignition engine which burns it's fuel in less time. In other words, the diesel piston has combustion pressure applied to it for several more degrees of crank rotation, because fuel spray is ignited and continues to feed the fire until injection has stopped.



You would think that with such a high compression ratio the diesel would make many times more the power of gasoline, however, the fuel is not the same.



Also, the two-stroke diesels do not produce twice the power of a four stroke because the two stroke can't breath well.



I said two-stroke,,,,not two-cylinder. We all know that the John Deere two-cylinder produces twice the power of a Farmall,right Turbo Tim?







Scott

 

[Turbo Tim 1]

Originally posted by Greenleaf



I said two-stroke,,,,not two-cylinder. We all know that the John Deere two-cylinder produces twice the power of a Farmall,right Turbo Tim?



Scott

Stop that, you're killing me

 

[formula]

Originally posted by CB_Parker

Does that mean I am wrong? I was always told the compression ignited the diesel...

Compression is the source of the energy needed for ignition. However it is the compression of the air that supplies this energy, not the compression of the diesel fuel. The purpose of the high pressure diesel fuel spray is to atomise the fuel in such a way to create the desired burn characteristics.

Originally posted by Bob Beauchaine

... ... . fuel is introduced and a controled explosion occurs ... ...

The fuel in an internal combustion engine does not explode, it burns (combusts). Combustion is the rapid oxidation of a fuel. Explosion is the extremely fast decomposition of a material (TNT, for example). The rate of expansion and energy release of an explosion is much greater than that which is created by combusion.



Cheers,

Sean

 

[Diesel Freak]

What Formula said!

 

[1 locomotive]

you guys are good !!! now can you tell me how to make diesel fuel !!!! ???????

 

[Greenleaf]

Refinery On eBay

Think I saw a refinery on eBay. Not a bad buy for $142,677,809. I believe it has seven days left to bid. Or,,,,,,get ya some crude and heat it up

 

[Paychk]

Use google and run a search on "bio diesel" make it from most veggie oils.



I'm not sure I would run it through a Cummins though!