Compression Ratio - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 03-02-04, 04:37 AM Thread Starter
wants a manual!
 
John_xr6's Avatar
 
Join Date: Oct 2003
Location: Melbourne
Age: 31
Posts: 1,461
Compression Ratio

what is the formula for figuring this out? thanks in advance.


1994 COBALT BLUE ED FAIRMONT GHIA
Next Mod - T5 Manual Conversion
Pics Here
John_xr6 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 03-02-04, 05:09 AM
Registered User
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 3,153
Re: Compression Ratio

Compression Ratio = (Cylinder volume + chamber Volume)/(chamber volume)

Cylinder Volume = (pi/4) x bore squared x stroke.


or

Compression Ratio = (PV+DCV+HGV+CCV)/(DCV+HGV+CCV)

where PV=Piston Swept Volume
DCV = Deck Clearance Volume
HGV = Head Gasket Volme
CCV = Combustion Chamber Volume

Regards Blue
Aussiblue is online now  
post #3 of 6 (permalink) Old 03-02-04, 05:17 AM Thread Starter
wants a manual!
 
John_xr6's Avatar
 
Join Date: Oct 2003
Location: Melbourne
Age: 31
Posts: 1,461
Re: Compression Ratio

i am assuming that piston swept volume is the dish in the piston? and is deck clearence measured when the piston is at TDC for the first half of the equation and and at BDC for the second half? or am i totally wrong.

1994 COBALT BLUE ED FAIRMONT GHIA
Next Mod - T5 Manual Conversion
Pics Here
John_xr6 is offline  
post #4 of 6 (permalink) Old 03-02-04, 05:25 AM
Registered User
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 3,153
Aussiblue is online now  
post #5 of 6 (permalink) Old 03-02-04, 05:29 AM
Registered User
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 3,153
Re: Compression Ratio

a) Yes as swept volume is...
"that part of the cylinder capacity that is swept by the pistons on their up and down strokes (i.e., the volume through which a piston moves in one stroke) formed by the bore diameter and the piston stroke. Also called "displacement volume." See displacement. from http://www.100megsfree4.com/dictionary/index.htm

Regards Blue

Last edited by Aussiblue; 03-02-04 at 05:36 AM.
Aussiblue is online now  
post #6 of 6 (permalink) Old 03-02-04, 05:45 AM Thread Starter
wants a manual!
 
John_xr6's Avatar
 
Join Date: Oct 2003
Location: Melbourne
Age: 31
Posts: 1,461
Re: Compression Ratio

thanks for the info and the links AussieBlue, will get all my figures now and punch them in to see my compression ratio.

1994 COBALT BLUE ED FAIRMONT GHIA
Next Mod - T5 Manual Conversion
Pics Here
John_xr6 is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome