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  1. #805
    300 is high, but static Comp depends a bit on cam timing...
    B20VTEC - since 2002

  2. #806
    Quote Originally Posted by tinkerbell View Post
    300 is high, but static Comp depends a bit on cam timing...
    Im running stock b16a2 cams with stock cam gears so overlap is stock, but compression is 11.5, will there be an issue with detonation?

  3. #807
    Member Array
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    Nov 2009
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    Brisbane
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    klungemobile
    If you're concerned about detonation run a higher octane, or make your own race fuel. It's not hard, just google it.
    We're doing it for the children.

  4. #808
    Quote Originally Posted by newpaddy3 View Post
    If you're concerned about detonation run a higher octane, or make your own race fuel. It's not hard, just google it.
    no - if you are concerned about detonation, then fix the problem properly...

    Lerlo - there is no way we can tell from behind our keyboards if there will be a problem with detonation - SOOOOOO many things can cause it... so you need to prevent it by designing your system properly...
    B20VTEC - since 2002

  5. #809
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    Nov 2009
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    lol sorry, I was drunk last night.

    tinkerbell is right though.

    Are you getting a reading of cel 32 or whatever the knock sensor throws out? Or are you just wondering if you may have a problem with detonation in regards to your build?
    We're doing it for the children.

  6. #810
    Quote Originally Posted by tinkerbell View Post
    no - if you are concerned about detonation, then fix the problem properly...

    Lerlo - there is no way we can tell from behind our keyboards if there will be a problem with detonation - SOOOOOO many things can cause it... so you need to prevent it by designing your system properly...
    Thanks tinkerbell, I got the car started and its idling fine now. No knocking on the PFC commander, all good for now.

  7. #811
    Quote Originally Posted by newpaddy3 View Post
    lol sorry, I was drunk last night.

    tinkerbell is right though.

    Are you getting a reading of cel 32 or whatever the knock sensor throws out? Or are you just wondering if you may have a problem with detonation in regards to your build?
    IM just wondering if I may have detonation in regard to my build, yeah. Cos Im using stock cam gears, therefore stock overlap but high compresison pistons....

  8. #812
    yes - you will get detonation if your setup is not tuned or poorly designed. it is not simply a matter of overlap vs compression.

    who tuned/is tuning your PFC?

    what is you 'calculated' compression ratio?

    what spark plugs, what fuel system, what ignition system? etc...

    all these can play a part in detonation and knock...
    B20VTEC - since 2002

  9. #813
    Member Array
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    Nov 2005
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    Adelaide
    Car:
    XR6 Turbo
    I havent actually read most of the recent comments in this thread, so dont flame me if it's a little off topic, but Im just going to add my 2cents worth anyways... one very important point that it seems most people over look is the fact that a certain static compression ratio can have different detonation characteristics depending on the combustion chamber shape and size, as well as the cam timing which will determine the engines dynamic compression
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    B20VTEC Build Thread

  10. #814
    Quick question, Im using a b16a sump and b16a dipstick on the b20 block, will the dip stick reading be accurate?

  11. #815
    why don't you use the B20B dipstick?

    won't that be correct?
    B20VTEC - since 2002

  12. #816
    Member Array
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    Feb 2008
    Location
    Brisbane
    Car:
    Dc2 + EG
    Quote Originally Posted by tinkerbell View Post
    why don't you use the B20B dipstick?

    won't that be correct?
    He's using a b16 sump which i'm presuming he isnt sure if its the same as b20 or not.

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