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what's the highest compression i can run on 91 octane???

Discussion in 'Engine Building' started by jspeccrx91, Jan 9, 2009.

  1. jspeccrx91

    jspeccrx91 New Member

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    I got a b20 vtec i'm working on but all i can get around here for gas is 91. gonna keep this one all motor but need to know the highest comp i can go. also my b16 setup now makes peak power at 9200. i plan on using this head so what can the b20 safely rev up too? or what can i do to it to keep it together up there?
     
  2. efhondakid

    efhondakid My name is Byron. VIP

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    I wouldnt spin it past 6500, the stock redline for the B20s, any higher and youll slowly stretch the rod bolts, and eventually destroy the motor. This is only for a stock bottom end though.
     
  3. nootrac22

    nootrac22 Well-Known Member VIP

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    are you serious, 9200RPM?????????????:bs:
     
  4. jspeccrx91

    jspeccrx91 New Member

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    dyno proven, fully built head, port/polish, brian cower stage 2 cams
     
  5. 95b16coupe

    95b16coupe New Member

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    can you post the dyno sheet?
     
  6. jspeccrx91

    jspeccrx91 New Member

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    be happy to post it up later 182whp b16
     
  7. efhondakid

    efhondakid My name is Byron. VIP

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    After you google a dyno sheet of something that makes power until 9200rpms.
     
  8. whiterabbit06

    whiterabbit06 Why oh why didn't I take the blue pill? VIP

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    I would have him write his username on the sheet then scan/take a pic.
     
  9. jspeccrx91

    jspeccrx91 New Member

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    dont have a scanner but my digi cam takes good pics not home right now or i would have it up
     
  10. austin20110

    austin20110 New Member

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    look forward to seeing it
     
  11. Magana559

    Magana559 The Warden

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    I Would Also Like To See That Dyno Sheet.

    Im Going to Run A 12:5:1 CR And BC Stage 3 Cams On Cali 91 pump gas.
     
  12. AHHVTEC

    AHHVTEC Well-Known Member VIP

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  13. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    Wait... what?
    9200?
     
  14. whiterabbit06

    whiterabbit06 Why oh why didn't I take the blue pill? VIP

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    I bet you he had it on the dyno and reved it till it blew and the dyno sheet has a powerband that spans till 9200 rpm at which time he shut it off because he heard a lot of noise. He then decided to make another run and it blew up which is why he now wants to rebuild the motor. If by some miracle chance he is telling the truth and he does have an engine that makes peak power at 9200 rpm then he should know how his engine was built and have some kind of research on how to get it to make power at that range including the amount of compression. This leads me to believe that his claim is either a croc or he has extremely low compression and some really good quality parts.
     
  15. nootrac22

    nootrac22 Well-Known Member VIP

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  16. INJEN78

    INJEN78 HS LEGEND

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    ALL ROTO NO MOTOR!!!
    bullshit your motor makes pa powr at 9200,thats when my boys fully built b18c5 drops off,and hes making a hell of alot mor power than 182whp
     
  17. jspeccrx91

    jspeccrx91 New Member

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    my bad i worded that wrong, after looking at my dyno sheet i peak around 8k drop off is 92. sorry for the confusion. no one awnsered my b20 question what can i do to safely rev to 8500-9k
     
  18. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    for a simple answer, reving to 9k is just not a good idea. if you can do it or want to do it, go for it, but let me know how long your engine lasts...
     
  19. Magana559

    Magana559 The Warden

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    stay at 11:1 cr and only rev to 8k with stock rods and injectors.....it will still go soon lol
     
  20. phyregod

    phyregod !!YTINASNI

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    Alot depends on the motor.. Timing, chamber shape, material, surface, etc..

    My bike has 12.2:1 compression, runs great on 91. Try that with a 72 ford and it'll knock and ping itself into oblivion.
     
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