Re: Which Creates More Heat?

Posted by NC Wayne on June 11, 2006 at 14:06:34 from (152.163.100.74):

In Reply to: Which Creates More Heat? posted by in-too-deep on June 11, 2006 at 09:20:28:

Remember, there is a difference in the heat of compression and the heat of combustion. In your case, considering the your asking about starting a tractor that is "cold" then the majority of the heat, at least initially, is going to be the heat from compression, not from combustion. The heat from combustion doesn't begin til the engine is actually running. Think about the older machines with pony start, especially ones like the old CAT dozers with the BIG inline engines. The starting process with them for "normal" ambient temps was to actuate the compression release to get the engine rolling fast and then kick it in for it to start. In that case the ambient temp was high enough that you didn't need anything more than the heat of a single compression stroke to make it hot enough for combustion. If the temps were cold then you put the pony transmission in low gear for the needed torque and turned the engine with compression on the cylinders for a few minutes. This allowed the heat of compression to warm the engine components enough that the "heat of compression" from a single stroke wasn't drawn down too cold to cause combustion. In many cases the pony was also responsible for warming the intake air, the oil, and the coolant, but the end result was always to get the component temps of the engine hot enough that a single compression stroke would creat enough compression heat to cause combustion. Just my .02

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]