Running reg or medium grade fuel with the 6.2?

[Badass69]

No you don't... for the cheap owners of the world that may as well have bought a 5.3 a low octane timing table is loaded on the ecm to ensure it survives on low grade fuel. If the cost of the recommended fuel is a make or break for you financially... you really shouldn't be looking at anything built in the last few years and stick with what you can afford. Case closed lol.

 

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[TJay74]

 

Octane rating is a measure of resistance to detonation of a compressed fuel air mixture of known concentration. It does not have anything to do with energy content of the fuel. You are constantly showing your ignorance of the subject at hand. So are the rest who have not presented factual evidence and want to convince the rest of us that their bat like hearing can detect knocking that no one else can.

 

The engine is direct injected in order to run on lower octane fuels. No one is discussing this fact. Comparisons to other engine types doesn't work.

 

Here is a line from Ford concerning their ecoboost v6's and fuel type:

 

"Despite being a high compression forced induction engine, the direct injection fuel system allows the ecoboost to run on 87 octane, regular unleaded gasoline."

 

The original specs for the engine also show it to run on 87 octane here: http://gmauthority.com/blog/gm/gm-engines/l86/

 

 

I guess since you are going to spout about ignorance then joint the club, yes octane is the fuels resistance to knock but it happens because of how the fuel burns. High octane fuel burns slower than lower octane fuel which is what keeps detonation at bay, high octane fuel with 10% (Ie E10 91 octane) has less BTU of energy than 100% gasoline of 91 octane. While GM designed the engines with DI it doesn't mean you can run 87, neither of those correlate to each other just because. DI allowed manufactures to run higher compression ratios which typically results in more HP per liter because the fuel is sprayed right into the combustion chamber instead of having to go thru a wet plenum system which resulted in a more thorough fuel burn in the combustion chamber. Just because the engine is DI doesn't mean it can run 87 and be fine, you still have to take into account the timing profile of that vehicle along with the weight of the vehicle and use of the vehicle which relate to the load the engine is going to see.

 

So go ahead and continue to act ignorant, go ahead and continue to run 87 in the 6.2 engines even though the manual states to not do it otherwise engine damage could happen and then point to an outdated manual that you are well aware of was corrected by GM, go ahead and do it even though plenty of owners who have the equipment to data log all show that even under normal driving with 91 octane that the 6.2 engines are showing knock events being recorded or that the 5.3l engines show even more knock.

 

Sounds like you are the one being ignorant, honestly I don't care though as I don't drive your vehicle, I don't pay for it and dont give two shits what you do with it. We are trying to make sure that someone like you doesn't convince another owner who honestly didn't know that they are fine driving their 6.2 truck on 87 like it is perfectly fine.