Engine Theory, Build, Etc Discussion.

Discussion in 'Engine & Transmission Mods' started by BlkCurrantKord, Oct 15, 2007.

  1. pyaarawala

    pyaarawala Well-Known Member

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    I'm a n00b at this stuff to so I just have a question:

    When you state compression, you state it in this format, XX:XX:XX. What do each sections mean? My car (F23a4) comes stock 9.3:1 according to the 6thgen general FAQ. Why is it that the lower the compression, the better? And by lower, you mean that it goes from 9:3:1 to 8:3:1 or something? Also, you said that increasing the combustion chamber, and lowering compression makes the car faster. How does the combustion chamber increase if the cylinder can not expand?

    Also, what's boring and sleeving?
     
  2. I4 CG5

    I4 CG5 Well-Known Member

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    ^^You want lower compression if you have a turbo and higher compression if your engine is N/A
     
    Last edited: Oct 15, 2007
  3. BadgerType

    BadgerType Resident ***hole

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    question for our Engine God, Greg

    How much hp is gained when switching to a dry sump system?

    how much boost can our stock sleeves hold? as in actual test, not speculation

    what engine break-in practice do you recommend for a newly built engine?

    Do you recommend lightening the crank for mid-high boost applications?

    Sythenic or sythentic blend oil for our engines?

    best way to raise the rev limiter?

    i shall have more for you greg
     
  4. xci.ed6

    xci.ed6 Well-Known Member

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    you mean, xx.xx : 1

    higher number = higher compression, higher cylinder pressure before ignition
    lower number = opposite

    ex: 6.0:1 the volume of the combustion chamber at BDC is 6x the volume at TDC, etc...
     
  5. xci.ed6

    xci.ed6 Well-Known Member

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    How much hp is gained when switching to a dry sump system?
    too many factors involved for something thatno one in their right mind does

    how much boost can our stock sleeves hold? as in actual test, not speculation
    there is no answer to that question. boost has little to do with the factors that cause sleeve failure

    what engine break-in practice do you recommend for a newly built engine?
    drive it how you will be driving it

    Do you recommend lightening the crank for mid-high boost applications?
    less weight is always better

    Sythenic or sythentic blend oil for our engines?
    synthetic is always better

    best way to raise the rev limiter?
    reprogram ecm, but by the time the engine is ready for the rev-limiter to be raised, it probably also needs more than a piggy-back should be doing
     
  6. Roadrage

    Roadrage Well-Known Member

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    okay question for greg,

    How many teeth does our camgear have, For an A5, tried google got two different numbers, one says 40 and another says 37, hopefully u can help. thanks in advance
     
    Last edited: Oct 16, 2007
  7. BlkCurrantKord

    BlkCurrantKord Super Moderator

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    LoL - stop asking me specifically.

    No idea how many teeth our cam gear has. The best I could do for you is count my Skunk2 cam gear.
     
  8. BadgerType

    BadgerType Resident ***hole

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    you fail
     
  9. BadgerType

    BadgerType Resident ***hole

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    .
     
  10. xci.ed6

    xci.ed6 Well-Known Member

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    so did you just answer all your own questions?
     

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