Where can you get higher than 93 octane gas? My new mvvs 116 recommends 95. I really dont want to use avgas since it has lead in it. Any ideas who sells it? All I could think of is maybe a racing shop.

flyinrazrback

I was faced with the same problem for my ZDZ's. I just use 93, no problems. Something that I do is to only buy gas from a place that sells a lot of 93, to get "fresh" gas. I always first put about 4 gals into my car before I fill my 1 gal can. The logic is that there is still "other" fuel in the plumbing of the common filler line. I have had "bad" gas from some gas stations that made my ZDZ's run badly. After getting fresh fuel, all was well.

There was a discussion once on how to blend you own fuel from AVGAS and 93 to get the right octane. I don't trust that level of tinkering one bit. The octane ratings are never precise anyway.

Safe Flying!

US octane ratings typically are 5-8 points lower than European ratings due to specification methods. So If a European manufacturer specifies 95 or 98 octane, you will do fine with 90 or 93 octane(US)

Pe is correct. In the US gas is rated (Research + Motor octane)/2.
In EU, gas is rated Research octane.
Motor octane is a more severe test than Research octane, so the Motor octane number is a lot lower.

Is there a specific octane recommendation for the MVVS redhead 2.15? (35cc)
The paperwork I got with the motor did not address this.

Ok thanks for the info, learn something new every day, 93 it be then.

IIRC, the paperwork mentions 95 octane (US 89 octane) also look at the [link=http://mvvs.cz]MVVS website [/link] or [link=http://mvvs-nl.com]mine[/link]

I cant wait to run my 116. I got a fuchs 27x12 3 blade to throw on it. Engel tested his 116 right out of the box on a 27x12 3 blade @6300, so looks promising.

The Gas Cities stations in our area sell 100 octane racing gas. I just bought 5 gallons 2 weeks ago it was $4.49 a gallon. I have been using this stuff for 2 years in all my gassers. Its good stuff

Using that 100 octane Walt's test stand can pull out of hover at less than half throttle.

HeyWalt,is that Super Extra going to be ready by this coming weekend?

Im hoping so, got a vacation coming up and I need to prepare for it..

KLOTZ,

Nice engine test stand. [sm=thumbup.gif]

Bruce

Man that test stand does look good.
Where did the weldments come from?

Whats everyone's take on running 103 octane (no lead)? I will email the manufactuer and ask them as well. Its for my MVVS 116. I also thought of mixing it 50/50 with 93 octane to get 98.

My own tests on piped ZDZ with race gas showed that it really was of no benifit.
-Best bet - get good pump gas - highest available - 93-91 - mix with with 32-1 syn - sweeten to taste- serve cold in a red can.
yum yum
and
futz with timing a bit if you really up the ante on pipe settings - this can increase cylinder pressures -just like a blower on a car.

Ok thanks Dick, guess I will stick with 93. Did you notice if the tranisition was better with the high octane, or no noticiable difference? any increase in engine temp? Oilwise, I will be using the mobil 1 2T oil 32:1 to start, then 40:1 per manufactureres recommendations.

nothing noticable --

ok thanks, so running a higher octane doesnt really help, but it doesnt hurt the motor either?

I got your mail, but prefer to respond here.
First thing off my chest, I am not the manufacturer, but Dutch dealer/imporeter/exporter.

Higher octane than the required 95 octane leadfree (european octane) does not bring extra power. (that be ~90 US octane)
The high octaine additives slow down the combustion flame front sufficiently to avoid pinging (knock) If there is no knock, extra additives to raise octane rating, though they harm the engine not, are a waste of money.
In racing engines, compression ratios are much higher to get the ultimate power from the engine.

The MVVS 116, though very powerful, is not a racing engine. If it were, it would have forged and shotpeened pistons, should turn at least 10000 rpm, devellop 18 horsepower, and require tuned pipes and a prop rpm reduction gearbox to make good use of all that extra power.
As it is, The engine is capable of turning a 32x10 prop at 5200 rpm without reduction. These are hardly racing rpm, and requires very different engine tuning.

I've always been told that the additives put in to raise octane flash off of the fuel really quickly. If you are buying more gas than you can use in a month it wont be any better than 87 octane from the pump. I've always bought it in smaller quantities so I always have fresh gas, even for my lawn and garden equip. and have never had any problems. I've also heard but dont know for sure that at least here in Minnesota they just add methyl alcohol to raise octane. I know we have 10% in all our fuel by law. Which has just been changed to be 20% by the end of 2008. That being said its going to be more like glow fuel that gasoline before long.

I believe that ethanol is added, up to 85% in E85. See the link below:

http://www.e85fuel.com/index.html

Bruce

Ethanol is a bio-fuel, whilst Methanol is a poisonous wood alcohol.
Both raise octane ratings, but are by no means standard additives. Gasoline does loose its properties over time, because some components evaporate easily, especially those that enable easy starting. If these lighter fractions were used to increase octane ratings, then the residual fuel may indeed not meet our requirements any more.
Thus, it is wise to keep only small quantities, and mix with oil as you need it.
Keeping in par with spec's is one of the main advantages of Aspen fuel (an Alkylate gasoline without the nasty smell) It has only one fraction type, and will not go stale. It also will maintain its properties in a mix, if kept over time.

preivers
Do you know what octane rating this Aspen fuel is?

95/92 (RON/MON)
Look at http://www.aspen.se/Templates/standard1.asp?PN=106154, or the data sheet
http://www.aspen.se/files/pdf/prodblad/ovriga/2t4t.pdf