Is Premium Gas ok? - Page 6 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace



Go Back   Focus Fanatics > Ford Focus First Generation > DURATEC Performance (2003-2007)

DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
FocusFest Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 02-10-2014, 09:18 AM   #51
mlheck
Focus Rookie
 
Join Date: Feb 2014
Fan#: 140617
Location: Ft. Wayne, IN
What I Drive: 2012 Focus SEL

Posts: 12
FF Reputation: 1 mlheck Good Standing Member
Buy-Sell-Trade Rating: (0)
The ECM retards or delays the timing if it senses knock through the knock sensors in the block. The timing will run at the setting pre-programed into the ECM. This setting is predetermined by the engineers and will not move beyond this maximum no matter what fuel you use.

Retarding timing makes less power.

Increasing timing makes power.

Back in the day before computers we had full control over the timing. But many a motor was trashed by somebody trying to advance the timing to far. Pre-ignition will melt a hole in the top of a piston or bend a connecting rod.

If your car calls for premium you actually affect the efficiency of the motor and your gas mileage by using a lower octane.

Ethanol is a joke and actually has a lower thermal burn therefore producing less power per gallon compared to straight gasoline. It also draws water and is corrosive to steel fuel lines. It also causes plastic fuel tanks to swell. Ducati had a major issue with their plastic fuel tanks and Ethanol.

To answer your original question, putting premium in a engine not designed to use it won't damage it, but is a waste of money. Many here have said different, but it comes down understanding what the ECM can and can't do and the science behind it.

The one thing everybody has to understand is that your motor is one large physics project. Every change you make affects the properties acted on by the other laws of physics and science inherit in a internal combustion motor. If you ever get the chance to talk to a engineer that designs internal combustion motors you would be surprised by how many misconception there are on these forums.

Last edited by mlheck; 02-10-2014 at 04:33 PM.
mlheck is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 01:09 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.