Jump to content

fuel gas alcohol and diesel


ImSoBoard1

Recommended Posts

The main thing that make diesel incompatible for a gasoline engine is a gas engine is spark ignition and the fuel needs to resist pre-ignition (auto ignition due to compression and heat) until the spark plug ignites it.  This resistance is termed the "octane" value.  Diesel fuel octane value is VERY low which is why diesel can only be added to the combustion cycle right when you want it to burn thus it is termed a "compression ignition engine".  The fuel ignites as soon as it is delivered inside the combustion chamber. 

 

If you put diesel in a gas engine, you get some nasty auto-ignition which can kill it good and fast.  Diesel fuel is actually a refined oil so it has natural lubricating properties.  This property is exploited in diesels by lubricating the high pressure fuel pumps.  If you put gasoline in a diesel, not only can you cause injector damage, you can kill the injection pump that is lubed by the diesel fuel. 

 

LSD and ULSD have been an issue for older diesels.  This is a referrence the the Sulfur content in PPM in the fuel.  Sulfur is a nice round molecule that adds lubrication. Without this Sulfur in pumps that need it, it can cause premature failure. 

 

As far as RPM of a diesel, this has more to do with the design of the engine built for the higher compression and the higher carbon content that needs more burn duration thus longer stroke engines that just cannot run high RPM.  However, smarter component design is pushing the limits every day but the whole idea of diesel is to exploit the long burn duration of the fuel to get a leak torque value at a very low RPM thus reduced engine wear. 

 

 

 

Brandon

Mull Engineering

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...