That is rediculous

Posted by jdemaris on March 28, 2006 at 05:58:35 from (66.218.24.78):

In Reply to: Re: Words change over time posted by MarkB_MI on March 28, 2006 at 03:41:34:

To say "there is no such thing" as effective compression ratio is plain rediculous. Do a tech library or your Google search and you'll find thousands of articles on the subject.
From a general point of logic, it is one thing to say you know, for sure, the existence of something. But, to say, you know for sure something DOES NOT EXIST is silly. To do so with accuracy, you would need to know everything there is to know. I don't. I suppose you don't either.
You advise me to "ask any mechanical engineer", I have. I've worked with many and I know several, including both my wife's parents who are both retired engineers from Ford Motor Co. - one from the engine-design department.
I've read many spec. sheets on proposals for engine designs included Daimler's patent of a supercharger in 1885. Mechanical(static) compression ratio versus effective (dynamic) compression ratio has been a recognized factor in literature I've read dating back to the early 1900s.
I've got no issue with anybody accepting and using whatever definition they choose. My point is, it does NOT mean the same thing everywhere. A close friend of mine worked as a English-German technical-language translator - and it's a tough job since words in the technical world often have different meaning elsewhere. Ever notice how screwed up instructions are at times with Chinese stuff? That's a tech-translation Chinese - English problem.
YOU claim "there is no such thing" as effective ccompression ratio. Wrong. I guess I should tell you the same thing you first told me - ask a mechanical engineer - but make sure he/she is acquainted with internal-combustion engine design.
The bore and stroke is one factor that determines compression. Just as important in valve timing since no compression takes place with an open valve. Add into that, super-cooled or pressurized intake air, and find a way to time its entry, and "effective compression ratio" becomes a dominate factor.
Many turbocharged engines have to be built with a lower mechanical compression ratio than their non-turbo versions, because the resulting "effective compression ratio" ends up being very high.
In regard to "first hits" you get on Google, first hits have nothing to do with validity. First hits are determined by meta-tags inserted into the background hypertext markup language (HTML) on webpages, and how much money is paid to search-engine companies to reference it quickly. Achieving "first hits" is a specialty in itself for webpage publishers. I do it for several real-estate companies.

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