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Thread: ethanol testing

  1. #1
    One day at a time..... N8R's Avatar
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    ethanol testing

    I do not know if this the best or most accurate way to have done this but, it convienced me.
    Went to valero got 5 gallons 93 octane was told 13% ethanol. Next I went to shell and got 5 gallons of 93 octane and was told theres was 3% ethanol.
    Drained all gas out & put in 2.5 gallons valero gas. 81.3 @7350 rpms
    Drained remaining fuel again replaced with shell 81.7 @ 7380 rpms
    repeated process again valero was 81.5 @7360 rpms
    & shell was 81.9 @ 7390 rpms
    The plugs were read after wot passes.
    valero gas the plugs were alot whiter indicating a lead condition the shell gas gave a nice carmel color.. still need to do the fuel preasure regulator , out of fuel
    3 passes were made each cycle, water conditions were a little ruff and the rad was read bad. 1200 grate 14/23 pitched by Jim.


  2. #2
    All hail the Chief! fullboogie's Avatar
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    I wonder if those numbers are within a margin of error, considering changing weather, engine temp, etc.? Good info bro.

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    Moderator RX951's Avatar
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    Thumbs up

    Considering ethanol has an octane rating of 100+ or higher, and the Valero has a higher ethanol content (13%) vs. the shell (3%), and ethanol has a slower flame front, I agree with the results.

    Remember, the lower the octane, the faster the flame front speed. Basically how fast gas burns. rule of thumb, 87 octane burns faster then 93 octane.

    And seeing how you did this twice, and comparing the ethanol % of each confirms this testing.

    .02

  4. #4
    this must be why to much octane in ski`s that do not require it slows them down...

    good info Nater!

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    Mike xsockguyx's Avatar
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    Good Info......very interesting

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    Moderator RX951's Avatar
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    Quote Originally Posted by Pale Rider View Post
    this must be why to much octane in ski`s that do not require it slows them down...

    good info Nater!
    yUp.....Ross proved that as well about a year back
    http://greenhulk.net/forums/showthre...ghlight=octane

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by N8R View Post
    ...The plugs were read after wot passes.

    Valero gas the plugs were a lot whiter indicating a lead condition the shell gas gave a nice carmel color...
    Does the ethanol change the way the plugs read?

    In other words, since it is not just gasoline being burned in there, does the whiter plug shade still indicate the same level of 'leanness'?

  8. #8
    Quote Originally Posted by RX951 View Post
    yUp.....Ross proved that as well about a year back
    hmmm, I`m prolly overkill with 92-93 with 145-142 head...
    I`m sure if i had to use 89 marine fuel I would be ok...

  9. #9

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    good article

    i like both of your articles....the one you list 87 octane = 83.2.......thanks for the info.

  10. #10
    One day at a time..... N8R's Avatar
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    Quote Originally Posted by K447 View Post
    Does the ethanol change the way the plugs read?

    In other words, since it is not just gasoline being burned in there, does the whiter plug shade still indicate the same level of 'leanness'?
    the valero gas left the plugs white the shell gas gave them more of a carmel color which I find to be less lean..

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