FEH 12.3 to compression ratio

Thread Tools
 
Search this Thread
 
  #1  
Old 11-09-2008, 02:33 PM
Billyk's Avatar
Ridiculously Active Enthusiast
Thread Starter
Join Date: Nov 2006
Location: Southwestern Pa
Posts: 1,747
Default FEH 12.3 to compression ratio

This link: http://www.fordvehicles.com/suvs/esc...eatures/specs/

specifies a 12.3 to 1 compression ratio for the Ford Escape Hybrid. What other street legal--non-turbo engine-- vehicles have a higher compression ratio?
 
  #2  
Old 11-09-2008, 03:10 PM
Join Date: May 2005
Location: Jupiter, FL
Posts: 2,468
Default Re: FEH 12.3 to compression ratio

Originally Posted by Billyk
This link: http://www.fordvehicles.com/suvs/esc...eatures/specs/

specifies a 12.3 to 1 compression ratio for the Ford Escape Hybrid. What other street legal--non-turbo engine-- vehicles have a higher compression ratio?
This is what I call misleading about the FEH and why I used the term final compression ratio in the FEH in my post about John and the SGII. You and John know that the intake valve in the Atkinson Cycle engine stays open during the compression stroke to reduce compression at the time the ignition fires a spark. Is the truth about Ethanol that important to ruin our economy for you? Maybe you don't understand compression ratios or maybe you do and support the big rip off of ethanol.

The link you provided does not give the FEH the 12.3 compression design in the Atkinson engine, but I know where you are trying to go with your post. Shame on you Billy!

GaryG
 
  #3  
Old 11-09-2008, 03:30 PM
colchiro's Avatar
Pretty Darn Active Enthusiast
Join Date: Nov 2008
Location: ND
Posts: 488
Default Re: FEH 12.3 to compression ratio

Gary, I think the reason you're so anti-ethanol is all the problems it caused for you to achieve and maintain this: "1st Place MPG Challenge".

I know it's a lot of work to get 1st place and I respect you for it, but I bet it would have been a lot easier if only E0 was available.
 
  #4  
Old 11-09-2008, 03:46 PM
08FEH's Avatar
Pretty Darn Active Enthusiast
Join Date: May 2007
Posts: 368
Default Re: FEH 12.3 to compression ratio

12.3 doesn't mean much without decent cylinder pressure tho. With all the bleed off, it's a good thing the engine has 12.3:1 or it would make even less power than it already does!

12.3:1 in an otto cycle would NEVER be able to run on even 93 octane super unleaded. Everyone would be running C12!! lol
 
  #5  
Old 11-09-2008, 04:15 PM
Billyk's Avatar
Ridiculously Active Enthusiast
Thread Starter
Join Date: Nov 2006
Location: Southwestern Pa
Posts: 1,747
Default Re: FEH 12.3 to compression ratio

Originally Posted by GaryG

The link you provided does not give the FEH the 12.3 compression design in the Atkinson engine

GaryG
FYI, the link does provide this information. Since most of us like to learn about our vehicle, please provide us information/reference with the compression ratio at "spark ignition".
 
  #6  
Old 11-09-2008, 04:53 PM
colchiro's Avatar
Pretty Darn Active Enthusiast
Join Date: Nov 2008
Location: ND
Posts: 488
Default Re: FEH 12.3 to compression ratio

Billy, I'm probably going to add 5 gallons of E70 (winter blend E85) in the next day or so. That'll get me 30% ethanol. Ethanol calculator.
 

Last edited by colchiro; 11-09-2008 at 04:57 PM.
  #7  
Old 11-09-2008, 11:21 PM
gpsman1's Avatar
Hybrid and Ethanol Expert
Join Date: Mar 2005
Location: All over the Central U.S.
Posts: 3,616
Default Re: FEH 12.3 to compression ratio

The FEH does NOT use a 12.3 to 1 compression ratio.

The physical dimentions measure to 12.3 to 1, but not all the space is used.

The effective compression ratio is close to every other "average" car on the road. I forget the number, and I don't want to post a guess.

The FEH has no special ability to better use ethanol than any other traditional vehicle.


*However, with the eCVT myself and a few others bold enough to try ethanol have notice lower RPMs to maintain the same driving speed.

-John
 
  #8  
Old 11-10-2008, 09:19 AM
DesertDog's Avatar
Pretty Darn Active Enthusiast
Join Date: Jun 2007
Location: Dry Heat, AZ
Posts: 311
Default Re: FEH 12.3 to compression ratio

The FEH has an expansion ratio of 12.3:1, which allows for greater thermodynamic efficiency. The 12.3:1 could be called the static compression ratio, an essentially meaningless term. Dynamic compression ratio, which is a function of SCR, ignition timing and valve timing, is somewhat helpful in determining detonation wrt fuel octane. Brake mean effective pressure is the most important parameter, but it is not easily understood by most and can not be readily determined from the physical properties of the engine. The effective DCR for the FEH is on the order of 7:1, much less than most OTTO engines.
 
  #9  
Old 11-10-2008, 09:23 AM
wwest's Avatar
Ridiculously Active Enthusiast
Join Date: Sep 2006
Location: Beautiful Pacific NW
Posts: 1,678
Default Re: FEH 12.3 to compression ratio

There quite a few modern day N/A automotive engines that have a "true" (overall) compression ratio of 12:1 and even 13:1. With DFI the evaporation of the fuel as it is injected directly into the combustion chamber has a "cooling" effect and thereby allows the use of a compression ratio above the otherwise traditional ~10:1.
 
  #10  
Old 11-10-2008, 09:27 AM
wwest's Avatar
Ridiculously Active Enthusiast
Join Date: Sep 2006
Location: Beautiful Pacific NW
Posts: 1,678
Default Re: FEH 12.3 to compression ratio

Originally Posted by 08FEH
12.3 doesn't mean much without decent cylinder pressure tho. With all the bleed off, it's a good thing the engine has 12.3:1 or it would make even less power than it already does!

12.3:1 in an otto cycle would NEVER be able to run on even 93 octane super unleaded. Everyone would be running C12!! lol
The FEH/MMH doesn't use the "otto" cycle. It uses the Atkinson cycle that was invented back in the late 1800's in an attempt to circumvent the "otto" cycle patents.
 


Quick Reply: FEH 12.3 to compression ratio


Contact Us -

  • Your Privacy Choices
  • Manage Preferences
  • Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

    When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

    © 2024 MH Sub I, LLC dba Internet Brands


    All times are GMT -7. The time now is 03:45 PM.