87 vs 93 Octane experiment FAILURE….

[@joels7605]

Next video: 87 vs 93 octane taste test.

[@xlr8ing_zgarage]

Lol!!! Thanks but no thanks!!

[@rickhayes8009]

🤣

[@cybermut2000]

Octane rating has nothing to do with the amount of energy or volitility of the fuel. octane rating is simply and numerical representation of the fuels resistance to detonation in the engine. detonation is also knnown as knocking caused by an iregular combustion of the fuel.

[@xlr8ing_zgarage]

The purpose of this experiment was to show that higher octane fuel burned slower than lower octane. And high octane fuel is less volatile, making it more detonation resistant.

[@emmettturner9452]

Yes, octane only rates detonation resistance, but it doesn’t mean nothing else changed with that. The experiment is to find out what else may change with that.

[@miltonzhang947]

Mate, higher octane rating is there to prevent knock, which is the unplanned pre-ignition of the air-fuel mixture in the cylinder due to compression and heat. The normal ignition is trigger by a spark, but if your engine's too hot or the compression's too high, with a lower octane fuel you get the boomba before the spark. Igniting the fuel with fire is the same as igniting it with a spark, it just won't show the difference. Higher octane rate fuel not necessarily burn slower, because ethanol is very high octane, but they burn quickly. It kinda depends on how quickly it mixes with air as well, also the burn rate under normal pressure and temperature is not representive to anything inside the cylinders. To test for the effectiveness of octane, you need two things: pressure and heat, you can compress them until they go boom. Higher octane rating fuel is expected to withstand higher pressure before igniting itself. Not the safest thing in the world, so my suggestion is don't try it.

[@xlr8ing_zgarage]

True that higher octane is used to prevent knock, and ethanol is a different matter completely running much richer stoich and much cooler temperatures. But higher octane gasoline does burn slower in engine use. And therefore needs more timing advance vs 87 octane in a direct comparison to extract any advantage from it. As you know most people use it for higher compression and boosted applications to prevent knock. My plan was to show a visual comparison of the burn rate and try to explain timing advance necessary for different fuels. But as I said in the video it didn’t go as planned.

[@miltonzhang947]

@@xlr8ing_zgarage Well, the burn is different with air-fuel mixture and pressure, you might have a look on that as well. Maybe try to use the injector to spray against a fire, and you put up a white board on the other side to catch the residuals. If higher octane indeed burn slower, more residual shall show up on the wall.

[@xlr8ing_zgarage]

@@miltonzhang947 thanks! I want to try this again but need to rethink it. Thanks again!

[@miltonzhang947]

@@xlr8ing_zgarage I mentioned ethanol, because it is a common octane raiser. So it might be wise to check on if the 93 octane has higher ethanol value(which would increase burn rate). I personally find many benefits using the E85 as an alternative racing fuel, fitted with some big injectors they produce tons of power. I get your point about advance timing with slower burning fuel, but for E85(which is a 105 octane rating), I barely raise any timing in the lower load region, because ethanol burns really quickly.

[@xlr8ing_zgarage]

@@miltonzhang947 unfortunately we don’t have easy access to E85 in my part of Canada. I’d love to try it!

[@modeverything1]

$20 up in flames! 😂 nitro next test?

[@xlr8ing_zgarage]

Yep!! Most expensive video I’ve made since blowing up the engine!! 🥴

[@TheHolan]

well, that was scientific

[@xlr8ing_zgarage]

Yeah not so much…

[@danscustomprojects4486]

Love the clips inserted. At least I didn't waste a lot of time watching but I'm glad you posted the failed experiment

[@additudeobx]

I'll bet that what I am going to say will make a difference in your tests. When you "dispense" fuel from a single hose gas pump, there is residual gasoline left in the hose from the previous "dispense". Could be like 1/3 gallon. If the customer prior to you dispensed "87" grade and you want to dispense "93" grade, then you will have to dispense the volume of fuel in the hose that is "87" grade, before you can begin fueling "93" grade. Same visa-versa, "93" to "87" .... you need to clear the "93" out of the hose, before you start receiving "87". I hope that makes sense.

[@xlr8ing_zgarage]

Thanks! I did actually try to account for that as well. I got the 87 octane after watching a Nissan versa fill up with 87 and the 93 came from my gas can of 93 octane I use for the project cars that I just got. Might be a slight degradation but should be minimal. Thanks!!

[@chauvinemmons]

It works it's just the pressure is too low if the surrounding pressure was Ten atmospheres or more it would be more obvious

[@xlr8ing_zgarage]

That’s what I was wondering if combustion pressure changes the speed of the burn. Also I’m thinking it’s just the flame front speed that should be measured, not the burn time.

[@senseimarvin454]

not much difference between 87 and 93 pump gas. Try it with 87 vs real race gas.

[@DrMicahLuv]

The human body is a terrible measurement instrument. Next time maybe use a laser thermometer to check the temperatures use a stopwatch. Best of luck be safe!

[@xlr8ing_zgarage]

I actually have a laser thermometer and only thought about using it afterwards. 🤦🏻 Thanks for watching!

[@Soniti1324]

This was 2.5 minutes of useless drivel punctuated by 30 fast-forwarded seconds of what any of us actually wanted to see. Stop telling us it's a failure and just light the gas already. No one cares about the preamble, we can deduce for ourselves what is either success or failure.

[@xlr8ing_zgarage]

So I should just set gasoline on fire with no reasoning or logic or explanation and that’s what everyone wants to see? Man I’ve been overthinking this whole KZbin thing….