av gas blend or race fuel

goofy · Apr 9, 2013

I know this has probably been talked to death, but as i left my local shop this week and they said they had rebuilt 57 motors this season and he could really on point to the possiblity of the ethanal blend he recommended me to run a 10 percent blend of race fuel in my machines, now this is a polaris and skidoo dealer not saying this is yamaha related but i was wondering if there was any opinion on blending every tank with av gas or race fuel? I have a 2010 nytro push turbo and really want this thing to last. Make myself clear i am not looking for performance improvement just peace of mind if all i can get it ethanol fuel.

thinksnow · Apr 9, 2013

Run AV 100LL fuel. Not much more than premium and WAY less than race fuel. Ran it in my turbos for a couple years without any problems. Smells nice also.JMO

motojunkie101 · Apr 9, 2013

Another thumbs up for av gas, been running it for awhile with good results on 9 lbs of boost.

Sent from my Commando

hottshot · Apr 16, 2013

As a Pilot and a boosted sled owner I run 100LL in pretty much all, the thing you have to watch in the lead fouling. The fix is to run a little MMO (Marvel's Mistery Oil) To keep the lead from sticking to your plugs valve guides/seats and O2 sensors . Hope that helps! :face-icon-small-coo

moly may · Apr 16, 2013

But a 50/50 mix max?? Av

thinksnow · Apr 16, 2013

I ran straight AV 100LL in my turbo for several years.

Mix as little or as much as you want. Figure out how much octane you need and error on the high side and run it.

stingray719 · Apr 17, 2013

Supercharged 12 pounds boost here in a Nytro. I found race gas mix with prem unleaded with ethanol I had an odd lag off idle and sometimes mid range.

Ran the mix Mike at Grand Mesa Lodge has in his tanks and NO PROBLEM! Lag gone! He has an av gas mix with premium unleaded WITHOUT ethanol and for me that appears to be the answer. Ran this same mix in my turboed Phazer and it too showed performance gains.

So thumbs up for av gas here too!

av8er · Apr 17, 2013

I've been running Avgas for years- highly recommend

here in the states right now it's about $6 a gallon, I run 10 lbs of boost on my m8- no det ever

thinksnow · Apr 17, 2013

$5.40 per gallon here in western ND. Last I checked it was $8.50 per gallon for race fuel.

100LL prices at this link.http://www.airnav.com/fuel/local.html

smwizzz · Apr 17, 2013

Safety!!!

It never hurts to run safe. 100LL is a good fuel for a lot of applications. I have run 91 at 10-12lbs with no probs. I run 100LL at 17 lbs and still no probs. Depends on Motor (compression/timing set up) work so you should ask your engine builder his recomendations. If you know the octane req'd and want to blend, you can use the formula:

(l1xO1) + (l2xO2)
______________

(l1 + l2)

Where: l1 = liters of 1st fuel
O1 = Octane of 1st fuel

l2 = liters of 2nd fuel
O2 = Octane of second fuel

This will tell you what the octane of the fuel will be after blending.

Another thing to remember... Octane does not always mean HP gains. Timing and compression are req'd for higher octanes to perform properly and boost is a very large factor in compression which is why octane IS important.

FYI... hope it helps!!!

Cheers!!!

yamaha151 · Aug 17, 2013

I run mine at roughly 5,500 feet at 10lbs when I get up into 7k plus without any adjustments im at roughly 12 to 13lbs of boost. that being said the last 3 years ive mixed 50/50, 91 octane and 100 ave gas. No issues yet. I have however read on some speed boat forums that you need to add some lube to your fuel, but I have yet to do so.. so if anyone has some insight or advice on if I do need to Id appreciate it.

sledfvr · Aug 17, 2013

They call avgas a dry fuel because it has additives to keep water out, that is where the term "dry" comes from. Avgas is one of the most consistant fuels you will find. It is low lead which means that it has some lead for lube, 91 obviously is unleaded. The dryness people refer to in avgas means that it has gone through great lengths to keep water out. It is not referring to the lubricant qualities as it has more "lube" than 91 unleaded. I run it and mix it with pump fuel and prefer it over 110 race fuel.

pelon · Aug 17, 2013

I run 91 at 10-12000 feet. no need for AV. 15LBS BOOST

dogschews · Aug 23, 2013

Bull ****

pelon said:
I run 91 at 10-12000 feet. no need for AV. 15LBS BOOST

Your only getting 7 pounds

Search

av gas blend or race fuel

goofy

Free Member

thinksnow

Well-known member

motojunkie101

MODERATOR: Premium Member

hottshot

Member

moly may

Free Member

thinksnow

Well-known member

stingray719

Well-known member

av8er

Well-known member

thinksnow

Well-known member

smwizzz

Well-known member

yamaha151

Free Member

sledfvr

Well-known member

pelon

Well-known member

dogschews

Free Member

Similar threads