EGT will be higher but cylinder head temps will be lower. Ethanol is a wonderous thing isn't it? The intake charge cooling gives our 5.0 motors a significant bump in hp compared to 93 straight gasoline.

 

Partly the charge cooling, more so the knock resistance. NA you don’t need anymore than e30 to reach max timing

 

Not to be too argumentative, but charge oxygen density has been repeatedly proven to be the primary cause of ethanol hp increases. Even EngineMasters did an episode on it. Compared octanes up to 114 race gas. Once timing reached an optimized level and out of detonation, then there was no hp to be had with octane, however, ethanol gave drastic power gains. The only significant difference being charge air temperatures.

Something else to consider is that although it has a lower energy density, ethanol (C2H6O) has oxygen built into the molecule while octane (C8H18) does not. With current technology on a NA motor, oxygen intake is the primary factor limiting power, so the lower energy density of ethanol plays no significant role (bigger injector) while its oxygen content plays a significant one. This is why ethanol give such a great power boost. Not only does it lower charge air temps increasing oxygen levels, the fuel itself is oxygenated. This is where so many of these internet conversations entirely miss the point about E85. Energy density is meaningless while oxygen molecules per cc of charge air/fuel is everything.

 

We're not talking about race gas vs ethanol. Which also shows not a huge drastic difference on anything short of racing engines though yes that is due to oxygen content. However at E30, we can reach max timing and E30 vs E85 is sub 5hp difference N/A from the oxygen content. These engines are octane limited on 93 though which is why there's as significant a difference as there is. EngineMasters didn't hit their octane limitation prior to testing ethanol, they made the exact same power/tq with 87 as they did on 91 and 110. 87 is farm-swill lol. The knock retard you'll see on 87 vs even 91 in a coyote is wild

 

Absolutely agree that our 5.0s have a lot of potential gain from octane where most motors don't, however, even the Ford engineers were recorded stating about 50hp on E85 vs 93. I haven't personally dyno tested. SOP dyno it's noticeable though. I still find it somewhat mind blowing that they can make a 12:1 motor run on 87 at all. My 10.5:1 alky burning hot rod motor won't.

 

how/where do you find this info?
did you happen to compare to Costco gas?

 

Labels on the pumps. All Costco is top tier.

It's been a while since I saw this. Looks like all the Warmart is now Murphy and NOT top tier. Sometimes us old guys have old info.