How to tell if DoD is working?

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Jul 21, 2010 | 11:15 AM

#21

jderou_GXP

On The Tree

Joined: Apr 2010

Posts: 108

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From: Missouri

Quote:

Originally Posted by indynotch50

Any chance you could send a quick how to on the LED?

Read through this post:

Fooling DoD

Jul 21, 2010 | 11:42 AM

#22

indynotch50

Thread Starter

Launching!

Joined: Mar 2010

Posts: 265

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From: Morristown, IN

There it is! I knew there was something out there but I couldn't find it! Thanks.

Jul 24, 2010 | 01:04 PM

#23

06 SS

TECH Fanatic

Joined: Jan 2007

Posts: 1,029

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From: LITH, IL.

Quote:

Originally Posted by 06MonteSS

lower octane burns faster... as such, it doesn't get a chance to burn all of the fuel, it's more of a flash ignition... so you don't get the most efficient use/performance of all the fuel, since it's not all being burned...

higher octane burns slower, so it's considered more efficient, since more of the fuel is actually being used/burned to provide performance...

so yes, you'd probably get better mileage with a higher octane fuel...

you're killin' me here Lew...Octane only influences the flash point of the mixture. Once it ignites, the flame will propagate at the same speed under the same conditions. Pulling a number out of the air, let's say that it takes another 70F to ignite 91 Octane vs 87 (and just a made up number). Once it fires, the mixture burns much hotter than it takes to ignite. All higher Octane does is keep the reaction from starting until a higher temp is reached. Once the reaction starts, you have enough heat from the gasoline molecule chain breaking down that they both burn at the same speed. Like if you had a piece of paper and hit it with 900F, it burns immediately. If you hit it will 970F, it burns immediately. The heat will travel in the combustion chamber at the same rate under the same conditions.

Jul 24, 2010 | 09:10 PM

#24

06MonteSS

LS1Tech Sponsor

Joined: Dec 2005

Posts: 2,932

Likes: 12

From: CT

hahahaah...

well, may I stand corrected then...

I've always known it to be that higher octane fuel burns slower than lower octane fuel...

"The higher the octane rating, the slower the fuel burns. Therefore, the lower the octane rating, the faster the fuel burns. Now at first this may sound like a bad thing, and many ask "Shouldn't a higher octane burn faster and be better for my car?"

The answer is no. If you've ever heard a "ping" in your engine and someone has told you to get a higher octane fuel, that is because the ping is acutally from the explosion of gasoline in the engine. Gasoline should not explode, but rather it should burn as quickly as possible. A lower octane rating will burn faster, and under the right conditions actually explode, causing that undesireable ping. Upgrading to a higher will allow the fuel to burn slower, therefore not exploding. "

"High octane fuel has more detonation resistance compared to lower octane fuel.
High Compression Ratio + Lower octane = Faster Combustion = Preignition/knock

higher octane = slower combustion"

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Last edited by 06MonteSS; Jul 24, 2010 at 09:15 PM.

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