understanding compression ratio
10-01-2010
#1
Registered!!
Thread Starter
Join Date: Jun 2010
Location: Albuquerque NM
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0 
understanding compression ratio
When talking about compression ratio, For example 11:1. 11 means total volume at TDC, and 1 means total volume a BDC right?
10-01-2010
#2
Registered!!
Join Date: Jul 2010
Location: Paradise Ca
Age: 41
Posts: 1,472
Likes: 0
Received 3 Likes
on
2 Posts
Rep Power: 183 
Re: understanding compression ratio
Well yes, but that is multiplied by atmospheric pressure. Which I believe is somewhere around 14lbs at sea level if I remember correctly. And that is TDC on the compression stroke. I am not sure if that is what you are asking, but I hope that helps. What are you trying to figure out?
10-01-2010
#3
Administrator
Hey! Look At Me!! I'm a Supporting Member!!
Administrator
iTrader: (22)
Join Date: Aug 2003
Location: Las Vegas, NV
Age: 39
Posts: 21,453
Received 1,146 Likes
on
801 Posts
Rep Power: 485 Re: understanding compression ratio
wait.. I think you have it backwards. Unless I'm mistaken.
1 unit at TDC, 11 at BDC. At BDC, maximum air in the cylinder, and in the case of 11.0:1, 11 times the volume of air in the cylinder than at TDC.
and for semantics, 14.7psi atmospheric at sea level..
edit: re-worded for more "correctness" (volume vs amount)
1 unit at TDC, 11 at BDC. At BDC, maximum air in the cylinder, and in the case of 11.0:1, 11 times the volume of air in the cylinder than at TDC.
and for semantics, 14.7psi atmospheric at sea level..
edit: re-worded for more "correctness" (volume vs amount)
10-02-2010
#5
Administrator
Hey! Look At Me!! I'm a Supporting Member!!
Administrator
iTrader: (22)
Join Date: Aug 2003
Location: Las Vegas, NV
Age: 39
Posts: 21,453
Received 1,146 Likes
on
801 Posts
Rep Power: 485 Re: understanding compression ratio
I did, too, until I started to type in my concurrence with you. That's when it just didn't sit right with me.
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
Touge
Canada East
0
09-23-2015 10:51 PM
Touge
Ottawa
0
09-22-2015 11:58 PM
Touge
Canada East
0
09-01-2015 11:25 PM
110, 2001, 2003, 2010, civic, compession, compression, good, honda, manual, problems, ratio, ratios, service, understanding
