Fuel Octane?
Peaceful Browser
Joined: Apr 2007
Posts: 4,960
Likes: 1
From: Miramar, Florida
RE: Fuel Octane?
ORIGINAL: OldMoparMan
Quite the opposite....
The higher the octane, the SLOWER the fuel burns, reducing preignition on hot pistons and cylinder metal.
That's why 87 octane pings like a biotch in high compression engines, (compression causes heat: IE Diesels) because it has a higher/faster burn rate, and a lower flash point.
To boot, running high octane fuel in a car NOT designed to run it is a waste, and due to a slower burn rate, can lead to piston/valve deposits due to causing an "over rich" condition.
I ran the 91 octane program with a tank of 87 octane fuel and couldn't pull out from a dead stop without the engine pinging. With the 91-93 octane in my truck, it runs a ton better.
ORIGINAL: L and R Two
Higher octane just burns cleaner and faster thus reducing the chance of knock and tapping.
Higher octane just burns cleaner and faster thus reducing the chance of knock and tapping.
The higher the octane, the SLOWER the fuel burns, reducing preignition on hot pistons and cylinder metal.
That's why 87 octane pings like a biotch in high compression engines, (compression causes heat: IE Diesels) because it has a higher/faster burn rate, and a lower flash point.
To boot, running high octane fuel in a car NOT designed to run it is a waste, and due to a slower burn rate, can lead to piston/valve deposits due to causing an "over rich" condition.
I ran the 91 octane program with a tank of 87 octane fuel and couldn't pull out from a dead stop without the engine pinging. With the 91-93 octane in my truck, it runs a ton better.
Captain
Joined: Dec 2004
Posts: 679
Likes: 0
From: New Castle Delaware
RE: Fuel Octane?
I have an 04 4x4 hemi Quad cab ThjunderRoad and I use 87 all the time. Yesterday I pulled my 5,000 lb boat with no problem and no Ping.or knock. i bought the truck new and it now has 18,000 on it. I toppedof the tank today amd my average was 14.4 That included pulling my boat 100 miles. No I wasn't using the over head computer.
Veteran
Joined: Jun 2007
Posts: 387
Likes: 5
From: Bel Air, MD
RE: Fuel Octane?
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
Professional
Joined: Jul 2007
Posts: 118
Likes: 0
RE: Fuel Octane?
ORIGINAL: bdhuntr
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
Zack
All Star
Joined: Jan 2007
Posts: 982
Likes: 0
From: Connecticut
RE: Fuel Octane?
You should just check your owners manual... it will be right in there. I doubt much has changed, but Icould be wrong, but it should be 89. Before my tuner I used 87 without a problem, but after the SC (like I said earlier in this thread) I have been running 91 or 93 (whatever is available) and have gotten more power and more miles per tank.
Veteran
Joined: Jun 2007
Posts: 387
Likes: 5
From: Bel Air, MD
RE: Fuel Octane?
ORIGINAL: Zack1978
Well what does Dodge recc for an 07 2500 Hemi?
Zack
ORIGINAL: bdhuntr
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
Zack
Regardless, that engine requires 89 octane gasoline.
Professional
Joined: Jul 2007
Posts: 118
Likes: 0
RE: Fuel Octane?
ORIGINAL: bdhuntr
No offense, but it's just as easy for you to search forthat requirement as it is for me.
Regardless, that engine requires 89 octane gasoline.
ORIGINAL: Zack1978
Well what does Dodge recc for an 07 2500 Hemi?
Zack
ORIGINAL: bdhuntr
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
You should fuel up with the octane rating the manufacturer suggests, unless (as previously mentioned by many) you have installed performance mods that mandate a higher octane fuel.
Octane ratings are a measure of the fuel's anti-knock quality and not its "power", although using the correct grade of fuel can increase an engine's power if it burns that fuel completely rather than pre-detonating it or wasting it unburned out the tailpipe.
Zack
Regardless, that engine requires 89 octane gasoline.
Zack