Re: How does a Diesel become 50% fuel efficient?

Posted by Bob M on February 10, 2006 at 16:02:25 from (69.205.121.140):

In Reply to: How does a Diesel become 50% fuel efficient? posted by DanDHA on February 10, 2006 at 10:04:25:

The very largest diesels (tens of thousands of horsepower) can approach 50% thermal efficiency. They do this by several methods:
- Using few, but enormously large cylinders to minimize combustion chamber surface area relative to displacement (to minimize heat loss)
- Operating at constant RPM and load so engine variables such as valving, compression, fuel injection, boost pressure, etc can be optimized for fuel efficiency.
- Precisely controlling inlet air, lube oil and coolant temperatures.
- Using low friction lubricants optimized for use at a single temperature
- Few starts and stops (these engines are typically started and then run at rated load continuously for days)

Obviously these techniques cannot be applied to the small (relatively) displacement, variable speed, variable load automotive diesel engine. For these efficiencies in the low-mid 30 percent range are the best that can be expected � and in actual "real world" use may only be half of that.

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