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 AvGas 100LL 
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I have the results of our unscientific fuel comparison. We tested Renegade 110+, 100LL Avgas, and Sunoco 110.

The Renegade and Sunoco came in sealed 5 gallon containers. I got the 100LL from a local seaplane school that uses LOTS of gas so I figured that would be pretty fresh.

The engine is a 358 inch SBC with 13.2 compression, iron heads, and a 1050 Holley Dominator. I'm not going to go into engine details beyond this. It's our dyno engine and it has at least 100 pulls just on E85.

We made three pulls with each fuel and changed fuels. NO carb jetting was done and NO timing was changed. We just pulled, changed fuels and moved on. We chose not to introduce any other variables.

Renegade 110+ 527.6 HP 439.7 TQ 10.56 gallon
100LL avgas 524.0 HP 428.8 TQ 6.50 gallon
Sunoco 110 527.7 HP 430.4 TQ 11.10 gallon

As you can see they are close but, avgas is down on HP a bit and down on torque a bit also. The Renegade 110+ made the most torque.

None of these fuels exhibited any bad characteristics I observed. They started well, ran well, and throttle response was good.

I'm sure any well educated racer would be able to tear apart my test methods. That's okay with me.

If I had a 12.5:1 motor I would not hesitate to run any of these fuels. I just had to know if there was a difference and I feel I satisfied that curiosity. The reader can make his own choice.

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Sat Sep 21, 2013 10:36 pm
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I'd say that test was about as straight up and un biased as any I've seen. It reflects what the average racer could expect to see by just switching fuels. And your test backs up our own tests that show Renegade 110 has a big advantage in torque over other brands.


Fri Oct 04, 2013 12:02 pm
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Joined: Sat Aug 24, 2013 7:57 pm
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Location: Frostburg, MD
Gents,

I like 100LL too.

Are there differences in those three fuels that might make the jetting requirements different? If so, could the power output from each be a little off in one or more?

Booster, please don't take this as a bash to your testing, I appreciate that you did it.

Dave


Fri Oct 04, 2013 7:03 pm
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Yes, jet requirements can easily be different, Bruce just had limited time and wanted to make the switch without making carb changes. If I were to guess going up a jet might have helped the av-gas a little.


Fri Oct 04, 2013 8:25 pm
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Location: Frostburg, MD
jmarkaudio wrote:
Yes, jet requirements can easily be different, Bruce just had limited time and wanted to make the switch without making carb changes. If I were to guess going up a jet might have helped the av-gas a little.


Thanks, Mark.

Specific gravity and so on? Another subject that I should study....

Dave


Fri Oct 04, 2013 9:19 pm
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SG is one, RVP is another, vaporization curve another...


Fri Oct 04, 2013 10:08 pm
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No offence Dave.

I was really time limited. I really pressed to get this test done. We still have 1 E85 Dominator 1050, 1 500 2bbl, and an unfinished E85 1.500 x 1.75 QFT with Braswell boosters (this one shows real promise) to run yet.

I believed and still believe that for the average racer there is little or no difference between the common 110 octane "race gas" and 100LL.

Phillips and Shell publish the MSDSs for each of their fuels. Sunoco and Renegade list their info on the respective websites. Check specific gravity and RVP figures. Sunoco used to publish that 110 purple had 2-3 grams of TEL per gallon. I don't know if that's the same now. I don't know what the TEL content of Renegade 110 purple is. I do know that 100LL had it's lead content reduced to 1.2-2 grams per gallon sometime in 2010.

A 3.7 HP variance between the three gasolines is nothing to get excited about for bracket racers. To put it into perspective, pro classes would sell their children for that much HP.

a 9 to 11 TQ difference between Renegade and the other two fuels gets my attention. If I had to buy 110 race gas I'd go for Renegade if I could get it. It's cheaper that Sunoco. 100LL can be had cheaper than both.

So to sum it up.
If you can get a good supply of E85, run that.
If you can get 100LL, by all means run that.
If you can only get 110 "race gas" run Renegade if available.

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Fri Oct 04, 2013 11:12 pm
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Gents,

SG is a tad lower, and RVP too [avgas must be less apt to vapor-lock?] Nutshell, 2 jet sizes to start? Could 2 jet sizes from optimum equal say 1/2 of that 9-11 lbs-ft. If so, the Avgas looks really good.

Thanks.
Dave


Sun Oct 06, 2013 12:49 am
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2 jets lean might do the trick. But like anything, use a test session to se what your engine wants for jets.


Sun Oct 06, 2013 9:57 am
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dave brode wrote:
jmarkaudio wrote:
Yes, jet requirements can easily be different, Bruce just had limited time and wanted to make the switch without making carb changes. If I were to guess going up a jet might have helped the av-gas a little.


Thanks, Mark.

Specific gravity and so on? Another subject that I should study....

Dave



Jetting and timing changes would have made a difference in the numbers for sure. And there's a very good chance that the Renegade 110 would have made even more power and torque. But as I said in a prior post, this test was very representative of what the average racer would see by simply switching fuels. And the results give everyone something to think about.


Wed Oct 09, 2013 10:55 am
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