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Quick compression question

Discussion in 'General Tech and Maintenance' started by ratbastard, Mar 13, 2006.

  1. ratbastard

    ratbastard Member

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    Will I have trouble running 13:1 pistons in my B20VTEC on 93 octane as a daily driver?
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    you will need very good tuning
     
  3. VTECPOWER

    VTECPOWER Senior Member

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    :werd:
    It will be hard, but might be alright on a VERY good/solid tune.
     
  4. ratbastard

    ratbastard Member

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    Thanks for the input guys. Just wondering would it HURT anything or just not run so good? Also I read on here and other forum of people running 12/12.5:1 on 93 with no problems is there really that big of difference between 12.5 and 13?
     
  5. 97hatch

    97hatch ?

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    yes and you need to allow for that time that your about out of gas and heve to run 91or 92
     
  6. ratbastard

    ratbastard Member

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    Another thing i was wondering, I have access to 100 octane but it is $4.50 a gallon would it actually help if I were to mix say 1 or 2 gallons of 100 in with every fill up or do you think the mix between the two would just kind of dilute the 100 enough to not really make a difference.
     
  7. MikeBergy

    MikeBergy Blah blah blah....

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    If you blend 92 and 100, this chart shows how diluting the 92 and 100 will increase the average octane.

    [​IMG]

    There are other charts out there for 90, 91, 92, 93 and so on octane, but it's pretty easy to calculate by hand.
     
  8. 97hatch

    97hatch ?

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    and what do you do when you cant get to the 100octane pump?
     
  9. MikeBergy

    MikeBergy Blah blah blah....

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    Use toluene in the same ratios. But you can only add so much toluene. There's articles on the net that I've found, just search for toluene diy race fuel. It's not the same as true race gas, but has similar antiknock properties from what I've read.

    One article I found a couple days ago...
     
  10. 97hatch

    97hatch ?

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    i just realized you live in cali do you think that you are going to pass smog.. and also the toluene is not very good from what i have been told and read
     
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