Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16
  1. #1
    Matatan tocullo's Avatar
    Join Date
    Nov 2010
    Location
    VISTA AL RIO FL
    Posts
    1,725
    +1
    69

    AV fuel who's running it?

    I'm getting an itch to use this fuel! I just don't know How much will it benefit me? Can someone instructed me on this please!


  2. #2
    It won't give you squat unless you have mods that can benefit from its use. For example, with your ET 145, at max boost, if the ECU is applying normal range ignition timing with 93 octane, using higher octane fuel won't benefit you at all. However, if the ECU is sensing knock at its full retard limit, then a higher octane fuel will generate more power since the ECU will give it more ignition advance.

    Only way to know is to give it a try.

  3. #3
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,929
    +1
    1,407
    Just a word of caution AV gas does not use the same octane rating as motor fuel.

  4. #4
    Matatan tocullo's Avatar
    Join Date
    Nov 2010
    Location
    VISTA AL RIO FL
    Posts
    1,725
    +1
    69
    Quote Originally Posted by beerdart View Post
    Just a word of caution AV gas does not use the same octane rating as motor fuel.
    Can you elaborate please?

    Thanks

  5. #5
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    100LL Avgas is a very good fuel and contains a TEL content of 1.2 to 2 grams TEL per gallon. This is an anti knock agent that works very well. If ur running a setup that can utilize pump gas there is no benefit other then running cooler and making your valves happier.

    Also there is no ethanol in 100LL and has a very long shelf life.

    Here in central Fl this fuel costs about the same as eth free 93. Right now its $4.99

  6. #6

  7. #7
    Matatan tocullo's Avatar
    Join Date
    Nov 2010
    Location
    VISTA AL RIO FL
    Posts
    1,725
    +1
    69
    Quote Originally Posted by Duke View Post
    100LL Avgas is a very good fuel and contains a TEL content of 1.2 to 2 grams TEL per gallon. This is an anti knock agent that works very well. If ur running a setup that can utilize pump gas there is no benefit other then running cooler and making your valves happier.

    Also there is no ethanol in 100LL and has a very long shelf life.

    Here in central Fl this fuel costs about the same as eth free 93. Right now its $4.99
    Great,I'm Going to give it a try. Would my AFR readings be different with this fuel? How much do you use?

    Thanks

  8. #8
    WICKEDSEADOO's Avatar
    Join Date
    Jun 2009
    Location
    SO CAL
    Posts
    777
    +1
    76
    i have been running av gas 100 for a long time without any issues. seems to work well from what i have seen.

  9. #9
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    Another interesting article from a fuel expert/racer-

    My experience comes from 7 years as the western states representative for 76 Race Fuel, Unocals 40 hours Advanced Products course, Working personally with Tim Wusz (senior performance products Rep for Unocal, Tim was responsible for Unocals race fuel development for 30+ years). I have also met and discussed fuels/motors with just about every engine builder in every facet of racing in the western United States. I also conducted Educational Seminars at the Fred L. Hartley Institute in Brea in which we would invite Engine Builders for a tour of Unocals testing facilities and do live octane tests on any gasoline they would choose to bring to the seminar. Included in the training we would demonstrate live tests how Distillation curve, Reid Vapor Pressure, Specific Gravity, Octane Rating, F;ashpoint, etc are conducted and the importance of these numbers. Some of you will remember me from contingency with my 76 Racing Gasoline hospitality trailer in the 1990's.

    Through the 50's, 60's, 70's and 80's Av gas was the base product used for most racing "gasoline". VP, f&L, Turbo Blue, and Trick all used AV gas as the base product. They would buy a tanker (8000 gallons of Av Gas) than add other hydrocarbons/TetraEthylLead (TEL) to the base, drive around the block stopping and accelerating the truck/trailer until they felt the product was mixed well. Obviously this was not science, but it worked for most racers only because most racers use a higher rated octane than they actually need.

    In the mid to late 1990's VP graduated to buying there own base product and do there blending of products in a much better fashion. Turbo Blue and Trick have since been bought Sunoco and are blended by Sonoco. Trick was purchased by Phillips 66 and has continued to be blended by Phillips 66.

    The only two companies I am aware of who "cracked" there own base product is Sunoco and 76. And as we all know, 76 race fuel is no longer available, leaving only one true manufacturer of Racing Gasoline....Sunoco.

    AV Gas has a MOR (motor octane rating) of 96, R+M/2 rating of 100, and ROM (Research Octane Rating) of 106.

    AV Gas is lighter than racing gasoline thus more fuel/larger jetting is required. Jetted correctly you should not experience a lean burn at WOT.

    I would not use AV Gas as a cleaner. The amount of TEL (2 grams/gallon) and other hydrocarbons makes it extremely carcinogenic. Same goes for all other racing gasolines.

    Shelf life is NOT better. The reason pump gas won't last as long is because street gas has extremely lightend hydrocarbons to help your car start and idle. Racing Gasoline does not have these light end hydrocarbons needed for idle and starting, hence the reason race motors start and idle poorly.

    Av Gas is NOT designed for low RPM motors. AV Gas is designed to not detonate/preignite causing detination. This would be the same design as race fuel. If you compare the "distillation curve" of AV Gas to Race Gas, you will find they are almost identical. The "distillation curve" controls the speed of burn across the combustion chamber.

    You will only "spit" gas out the exhaust pipes if you run to rich or include a supercharger/turbocharger on your engine and "overdrive" the blower. Example would be the bitchin flames you see at the starting line of a drag race on normally aspirated engines and the long flames you see on all "blown" engines.

    The LEAD (TEL) added to AV Gas is to increase the octane rating only. All heads these days have harden valve seats. There is no need for lubrication of the valve seats. All engines have come with harden seats since the late 60's.

    AV Gas is not formulated for High Altitude. and will have very little, if not any performance differences vs racing gasoline. On the other hand, commercial grade fuels (87, 89, 92) will definitely enhance your performance due to the commercial fuel being oxygenated. The Oxygen enhancers added to commercial fuel is only for California Smog laws.

    Advancing timing on your motor will definitely help with AV Gas and Race Gas due to its slow burn characteristics. On the other hand, be careful if your running commercial grade gasoline, more timing can cause detonation/preignition quit quickly.

    AV Gas does not go BAD faster. It is extremely consistent. The MOR is only 96, whereas Sunoco Purple or VP C12 is 104. A rating of 96 is good for up to 10:1 on Steel heads and 12:1 on Aluminum heads with water cooling. Air cooled motors run much hotter.

    Buying a higher octane for a $20-50K motor is the cheapest insurance available.

    Remember this...OCTANE is a measure of a fuels ability to resist detonation/preignition. The higher the Octane number, the slower the fuel burns. Technically speaking 87 Octane fuel will develop more power than 118 Octane fuel. With this said, you should see gains in throttle response and HP by mixing commercial fuel and AV Gas/Race Gas. You now have some light end Hydrocarbons for throttle response and heavy hydrocarbons/TEL for detonation resistance.

    Bottom line... use the most consistent fuel you can find and create horsepower by moving as much air as possible though the combustion chamber.

    I have no reason to be bias here as I have moved on to much greener pastures. See you on the race course.

    Good Luck,
    Steve Poole

  10. +1 by:


  11. #10
    big john's Avatar
    Join Date
    Sep 2010
    Location
    Cocoa Beach, Florida, United States
    Posts
    3,395
    +1
    598
    great article Duke !!! some good info

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Rxpx300....13/18r. Who is running it? Reviews?
    By Jwall in forum 4-Tec Performance
    Replies: 73
    Last Post: 07-04-2016, 11:59 PM
  2. Replies: 10
    Last Post: 03-09-2015, 09:20 AM
  3. R&D 802-00080 Fuel Pressure Regulator: Anyone running it?
    By Ski Hacks MG in forum Yamaha PWC Performance (4-stroke)
    Replies: 15
    Last Post: 01-23-2015, 02:49 PM
  4. Who Is Running an EGT or A/F or Fuel Pressure
    By rxpxseadog in forum 4-Tec Performance
    Replies: 13
    Last Post: 04-27-2009, 06:28 PM
  5. anyone who is running a SS wear ring
    By seadoo02xp in forum 4-Tec Performance
    Replies: 18
    Last Post: 08-23-2005, 09:35 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •