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  1. #1
    dhoad's Avatar
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    What octane gas with riva pistons?

    Looking for opinions on what octane gas people are running with the RIVA high comp pistons.
    I have the RIVAs in my ski and it motor is not broken in yet. Cam timing is fully retarded and static compression looks to be 155 to 160. I will be running x charger to start with and will likely upgrade to a mini rude later. Les Cooke ECU spinning 8800 and the rest of stg 3 stuff installed.
    For break in I was going to run 10 gallons 93 octane with 3 gallons of 110 to give me some safety margin. Is just running straight 93 safe?


  2. #2

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    there are a lot of missing variables. How much boost, how much final timing, and what intercooler?

    I run high boost and an aggressive setup, and run 50/50 mix Sunoco Supreme / 93 pump (prefer Shell)

  3. #3
    dhoad's Avatar
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    Quote Originally Posted by Louis914 View Post
    there are a lot of missing variables. How much boost, how much final timing, and what intercooler?

    I run high boost and an aggressive setup, and run 50/50 mix Sunoco Supreme / 93 pump (prefer Shell)
    Thanks for the response louis, I wish I was running the 25+psi you are.
    RIVA gen 1 IC, X charger at 8800 should produce + or -12 PSI. timing I am not sure on but it is LES cooke map. I will do AFR in coming weeks.

  4. #4
    Quote Originally Posted by dhoad View Post
    Looking for opinions on what octane gas people are running with the RIVA high comp pistons.
    I have the RIVAs in my ski and it motor is not broken in yet. Cam timing is fully retarded and static compression looks to be 155 to 160. I will be running x charger to start with and will likely upgrade to a mini rude later. Les Cooke ECU spinning 8800 and the rest of stg 3 stuff installed.
    For break in I was going to run 10 gallons 93 octane with 3 gallons of 110 to give me some safety margin. Is just running straight 93 safe?
    i think you are already in race gas territory there doug. i don't think 93 will do it. your effective compression ratio will be around 17:1

  5. #5
    dhoad's Avatar
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    Quote Originally Posted by rotax racing View Post
    i think you are already in race gas territory there doug. i don't think 93 will do it. your effective compression ratio will be around 17:1
    thanks Mark
    Looks like I need to go get a drum of race fuel for the season

  6. #6
    Juan's Avatar
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    Quote Originally Posted by rotax racing View Post
    i think you are already in race gas territory there doug. i don't think 93 will do it. your effective compression ratio will be around 17:1

    I Agree 100 % with Mark Race Fuel all the way that's what i am going to use 111 octane strait up

  7. #7
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    What if it were a Riva ECU @ 8500 ? Would it be more pump gas friendly ?

  8. #8
    Juan's Avatar
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    Quote Originally Posted by mrbtd View Post
    What if it were a Riva ECU @ 8500 ? Would it be more pump gas friendly ?
    no not with hi compression pistons and hi boost

  9. #9
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    Quote Originally Posted by rotax racing View Post
    i think you are already in race gas territory there doug. i don't think 93 will do it. your effective compression ratio will be around 17:1
    17:1 Hold on to that thing Doc, you better buy that gas by the drum and a couple of extra batteries and maybe a back up starter while your at it.

  10. #10
    Juan's Avatar
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    Quote Originally Posted by suck my wake View Post
    17:1 Hold on to that thing Doc, you better buy that gas by the drum and a couple of extra batteries and maybe a back up starter while your at it.
    With 160 pounds of compression and 18 pounds of boost at 8800 RPM he better buy some good fuel or IS bye bye ENGINE

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