Octane

Dan Whitaker · August 1, 2003

I have to run 89 in my 5.0 or it pings like a son of a B*&^$.

silver96 · August 2, 2003

Originally posted by Kadarom Douhrek
Yes, and in an engine that isn't designed for higher octane the spark fires too late.
That means the fuel isn't completely burned when the exaust port opens, allowing still burning fuel to reach the O2 sensors and cat.

Do that for too long and you will melt them.

When was the last time you saw 1500 degree egt's at the cat from the 4.0?

Kadarom Douhrek · August 2, 2003

Originally posted by silver96
When was the last time you saw 1500 degree egt's at the cat from the 4.0?

Fine.
Do that for too long and you will prematurely wear them out.

Is that better?

Oh, and have you never seen a glowing cat?

Alec · August 2, 2003

Mine ran that hot all the time under heavy accel and boost

silver96 · August 3, 2003

Originally posted by Kadarom Douhrek
Fine.
Do that for too long and you will prematurely wear them out.

Is that better?

Oh, and have you never seen a glowing cat?

Yes I have, and it was clogged.

Originally posted by alec Mine ran that hot all the time under heavy accel and boost

I checked out your site alec, that is one nice Explorer! I had an M112 on my last Mustang. Good choice with the
Eaton for offroad, can't beat instant torque and rock solid reliability.

dogfriend · August 3, 2003

I posted this in another thread on Premium Gas
There may be another reason NOT to use premium gas (other than price):

Quote from 'Ford Fuel Injection and Electronic Engine Control" by Charles Probst:

"It may even be less than desireable to use fuel with a higher octane rating than called for in the owner's manual. Recent advancements in emission control may depend on so-called "fast-burn" to reduce emissions. If you burn 92 RON when the engine is designed for 87 RON, the higher octane fuel burns slower, and may add deposits to the combustion chamber."

A couple of earlier replies in this thread mentioned the slower burn problem, but I thought that the problem with deposits might be interesting to some of you.

Also there is a TSB for the 4.0L OHV engine which says that using the wrong octane may lead to knocking because of increased carbon deposits. I posted the TSB in this thread Is is really true?

Slush Box · October 4, 2003

I run 93 Octane from Amaco because like everyone said i have a Diablo Sport Chip. The guys at Panhandle Performance told me its because the advanced timing the chip does. I asked if i could run normal gas and the guy said sure if i want it to knock. So here i am running 93. I don't mind i'm use to it now its in my monthly budget lol.

Leford · October 5, 2003

I put 95 Octane gas in Explorer, Here in Paraguay by Law the fuel under 98 octanes gives 15 % of alcohol, Wit the 87 octanes my engine works bad.
With Shell 95 octanes works better, with 98 better again but is toooo expensive.
By the way I use LPG too it have 110 octanes, is clean and cheaper

Octane

Dan Whitaker

One fast putty tat

silver96

Member

Kadarom Douhrek

Well-Known Member

Alec

Elite Moderator

silver96

Member

dogfriend

Human-Animal Hybrid

Slush Box

Well-Known Member

Leford

Active Member

Explorer Features

Explorer Features

Similar threads

Featured Content