Fuel for a 100

[3Dreaming]

I manage a small airport, and this is also where we fly models. I was wondering if it would be OK to use the 100LL aviation fuel for my DA 100, or do I need to make a special trip to town when I need fuel. Thanks, Tom

[jongurley]

Special trip,,, the AVGAS will void the warranty,,,,

[Bunky F. Knuckle]

I know people who run AVGAS LL and have no problems. Not sure if they run 100 or 110???? Probably 100...........

[DATech]

Avoid the Av-Gas. We see many problems with engines that have used it. Lots of deposits on the pistons and cylinders and problems with lubrication on the pistons and cylinders. Very easy to tell apart from engines using pump gas. We're not chemical/petroleum engineers, we simply see the negative results.

[Mithrandir]

I am late checking into this thread...but....
I fly at higher altitudes... and it gets warm here.... has DA or anyone experimented with fuel additives to increase power? I dunno.. maybe a Gasoline-Fuel mix with a bit more oil... will the needles open up enuff???
With gasoline at $3.00 a gallon, alcohol is not looking too bad!! lol...
Granted, fuel consumption would double, but the EGT's on my YS 140 were only 1000 degrees f!! ( I am not aware of any motor that had that much power for the weight!!!)

Has anyone experimented!?!?!?

in the summer when it is 100 degrees.. I NEED MORE POWER!!!!

[3ddd]

haha get a 106 lol

[Zee]

This is interesting, I have been running Avgas 100LL for long time and know people that do it also for long time, with no problems. Now I run ZDZ engines, also run it in 3W 60. No deposits on top of pistons.
Now there may be difference between manufactures, as far as materials used.
And I would listen to the manufacturer advise.
I have talk to guys at Horizon, and have been told that I should not have any problem running 100LL in our Evolution 58.
I use to race SCCA events both road racing and ProRally open class. I was running 10.5 :1 copression pistons with 12 lb boost on the turbo. After the season I pull the head off and everything very clean, piston tops and valves too. As some people have those old wife tales, having plugs fauled up, None of that happen. In my turbo engine I had to boost the octanes to 108.
But as noted by DA people they have different experiance, it also could be the oil thet one is using.
I personaly like the Avgas, it does not stink like car gas, it does not vaporize as car gas, and my engines are happy with it.
Zee

[Vic3D]

	Quote: Originally Posted by 3ddd
	haha get a 106 lol

Ditto.

[khan]

how about pipes?

[DoubleA]

DaTech,

I have a question concering your above statement! I understand you say you are not a petroleum expert, I was just curious if you see the same results in a racing fuel? If so what fuel do you suggest running for the best performance! Mixture? and why?
I flew my Yak today and nearly lost it, I believe the ignition went out! But I have noticed a large difference in power when it is tuned properly on racing gas!(it seems to run smoother as well)!
Is there something different about a DA that damages it when it is running on a higher octane fuel?
(I am not an engine expert by no means)! I just wanted to asked! I have a friend that builds racing four wheeler engines that told me running this style gas will not damage this motor! That is the reason why I ask if your motor is harmed by a high octane fuel! ( This motor has been through three people and has been used quite alot, I am not sure of any damage! I know the warranty is done. The other owners did not say if they sent it off so could you tell me what your suggestion would be!

Thanks,

[crazyjoe]

I believe higher octane is better suited for higher compression motors. I do no that we tried av gas on a zdz50 because a club member claimed he got better power using it. We experienced no power gain and saw no reason to continue using it. Hey Mith try flying in Colorado at 7000 ft. and 100 deg. I'm using DA 100s with vess 27a no problem hovering but not a rocket.

[ddlstang]

The higher the octain level the lower the combustiblity the fuel is, If the engine has a lower compression and is not detonating then you will have more power out of a lower octain fuel given the same amount of lead in the engine. The high lead content in avgas has some lubricating properties but that mainly effects valves but the lead also creates deposits in an engine.

The only benefit to a higher octain would be bump the compression and crank the ignition lead into it.

DA tech:
On a side note: has anyone seen any negative results from the 10 - 15% ethanol mix in the pump gases? I know ethanol attracts moisture real bad.