View Full Version : compression ratio?
GTR Dreamer
09-01-2004, 10:57 PM
how exactly is a comp. ratio formed....of what data ect. p.s any info on them would be good 2. :)
Ferrari Tifosi
09-01-2004, 11:35 PM
Compression Ratio = Volume of Cylinder + Combustion area at Bottom Dead Center (when the piston is at the bottom of its stroke) / Volume of Combustion area at Top Dead Center (when the piston is at the top of its stroke). That's how the Compression ratio is configured.
GTR Dreamer
09-02-2004, 10:27 PM
rrrrrrrrrrrrriiiiiiiiiiiiiiigggggggggggggghhhhhhhh hhhhhhhtttttttttttt........................:D
Egg Nog
09-02-2004, 11:09 PM
Ferrari Tifosi's explanation was very good... judging by your response, I assume that you are fairly new to engines. I have drawn you up a pretty oversimplified drawing that should answer your question. This is basically what he said, in picture form :)
You should note that the compression of an engine can be increased through forced inducion, which is when a supercharger/turbocharger forces high pressure air into the combustion chamber. (Also a purposefully simplified explanation)
If you want a more advanced overview of this subject (before Matra gets here and confuses you with 19 paragraphs of detailed explanations :p ;)), there is a very good technical article on HotRod.com
http://www.hotrod.com/techarticles/54258/
Ferrari Tifosi
09-02-2004, 11:12 PM
Nice job, explaining what I said with that picture. Good stuff there buddy.
Matra et Alpine
09-03-2004, 03:45 AM
If you want a more advanced overview of this subject (before Matra gets here and confuses you with 19 paragraphs of detailed explanations :p ;))
Jeez, I'm thinking it's best NOT to post to avoid these kind of comments.
Mature :)
Anyway, sorry, E-N, I'd already done it in other thread :) http://www.ultimatecarpage.com/forum/showthread.php?t=6809
But the effort to put the picture in deserves praise. makes it easier to explain to those starting otu learning about cars and engines.
yes just would like to big up the dedicated moderators on these forms really put time in to explaning things im glad i have found this site some top notch knowlage going round!!!!
GTR Dreamer
09-03-2004, 05:42 PM
thanks E-N, i understand it now. :D