Previous in Forum: Hardness of EN353   Next in Forum: rack pinion
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
3 comments
Rate Comments: Nested
Anonymous Poster

percentage of compression for reciprocal engine

04/22/2009 12:42 AM

Dear all

I would like to know what is the energy required to comress the air in a gasoline and in a diesel engine relative to to energy output?
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Jerrell Conway
Power-User

Join Date: May 2006
Location: Bahama, NC. USA.
Posts: 270
Good Answers: 18
#1

Re: percentage of compression for reciprocal engine

04/22/2009 12:52 AM

Would you like that with all the variables?

__________________
 For every great advancement in medicine there is an equal and opposite advancement in the denial of treatment.
Reply
nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#2

Re: percentage of compression for reciprocal engine

04/22/2009 4:46 AM

You can compute the energy per cycle considering a polytropic compression with an exponent 1,2...1,3 instead of the adiabatic one since there is a heat transfer from the wall.

If you know the power output at a given rpm it is possible to estimate the delivered power and obtain the ration you ask for.
Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#3

Re: percentage of compression for reciprocal engine

04/22/2009 7:21 AM

At sea level or at 4000m above it?

At what ambient temperature?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Reply
Reply to Forum Thread
Have a Different Question?
3 comments
Copy to Clipboard

Users who posted comments:

Jerrell Conway (1); nick name (1); PWSlack (1)

Previous in Forum: Hardness of EN353   Next in Forum: rack pinion

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (175 right now)
Show Members
Advertisement