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Thread: Evaporating Race Gas

  1. #1

    Evaporating Race Gas

    I am currently running a 502 with just under 10to1 comp. The vehicle is a full size blazer set up for side by side mud drags. The VP rep suggested going with their new oxygenated race gas. I am having problems with this gas evaporating as it goes into the intake. I made my first pass on Sunday and at the end of the track I let off the gas and it stuttered and quit. I first thought I lost an ignition box or coil or spark related when it wouldn't fire back up. I checked all that and everything is fine. I could pump the dominator over and over and the gas would evaporate before it reached the cylinder. The plugs were dry. I let it cool for a couple hours and it fired right up. Did I get a bad batch of gas or is this gas not designed for my application or is something else? Thanks for any and all help.

  2. #2
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Tell me more about your 502. Are you running Q16? If so you don't have near enough compression for it. To run Q or oxygenated fuel you have to richen it by at least 5% or your gonna be WAY LEAN. I run Q16 and LOVE IT!! I went up 5 jet sizes and I was already running over 1600cfm's. The Q fuel isn't gowing to evaporate any quicker it just has more oxygen content which makes it burn faster therefore needs to be richer.

    Also tell me about the end of the run. Bumpy, rough track? If so, were you off the throttle when you went over the bumps / bouncing. What I'm getting at is it's easy to bounce around alot and flood a dominator and that's what it sounds like to me by the limited info you gave us.

  3. #3
    Senior Member MASTER BUILDER
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    fuel

    With 10 to 1 you would use 113 in VP IF you want to use oxygenated fuel
    and you would step up bout 2 jet sizes if you were right on the regular race fuel Later J.Smith 4621 racing

  4. #4
    Senior Member MASTER BUILDER
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    Oxygenated fuel is more trouble then its worth. Give it a sheetload of nitrous man!
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  5. #5
    Quote Originally Posted by TheRabbit
    Tell me more about your 502. Are you running Q16? If so you don't have near enough compression for it. To run Q or oxygenated fuel you have to richen it by at least 5% or your gonna be WAY LEAN. I run Q16 and LOVE IT!! I went up 5 jet sizes and I was already running over 1600cfm's. The Q fuel isn't gowing to evaporate any quicker it just has more oxygen content which makes it burn faster therefore needs to be richer.

    Also tell me about the end of the run. Bumpy, rough track? If so, were you off the throttle when you went over the bumps / bouncing. What I'm getting at is it's easy to bounce around alot and flood a dominator and that's what it sounds like to me by the limited info you gave us.
    I am running 113. Dart pro 1s, je pistons and edelbrock super victor. The end of the run was a bit bumpy and was off the gas when it died but it wasn't flooded. We checked the plugs and they were dry as a bone. Even after pumping the crap out of it the thing still wouldn't fire and plugs were dry and I did have spark.

  6. #6
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by chevyfireball
    Oxygenated fuel is more trouble then its worth. Give it a sheetload of nitrous man!
    I agree on the trouble aspect 100% for my own stuff. Sounds like it must be getting closer to NO2 time for you in the southern hemisphere is it not? It sure sounds like it with that sound performance advice. I hope you rotate the earth again this season.
    Bruce

  7. #7
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Quote Originally Posted by TopspeedLowet
    Quote Originally Posted by chevyfireball
    Oxygenated fuel is more trouble then its worth. Give it a sheetload of nitrous man!
    I agree on the trouble aspect 100% for my own stuff. Sounds like it must be getting closer to NO2 time for you in the southern hemisphere is it not? It sure sounds like it with that sound performance advice. I hope you rotate the earth again this season.
    Bruce
    I'm glad some guys think this way so I will always have an advantage over them!! I will never run a non oxygenated fuel again!!

  8. #8
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Quote Originally Posted by landon718

    I am running 113. Dart pro 1s, je pistons and edelbrock super victor. The end of the run was a bit bumpy and was off the gas when it died but it wasn't flooded. We checked the plugs and they were dry as a bone. Even after pumping the crap out of it the thing still wouldn't fire and plugs were dry and I did have spark.
    The fuel is not the problem. (Unless it has water in it) I had a similar issue last week and found the distributor cap and rotor were bad. It was very hard to start. When it did start it ran like a tunna boat and acted just like it was running out of gas.
    I would check and make sure you're getting fuel into the intake and make sure you're getting plenty of fire. If it is it will start. ( if compression is not low of course)

  9. #9
    Member MASTER JOURNEYMAN
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    Sunoco Standard 110 octane or at the most Sunoco Supreme 112 octane and run from the oxygenated fuels unless you want to be very carefull with handling and fuel system care. The key element in "oxygenated fuels" is about 20 percent ethanol.


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