Results 1 to 4 of 4

Thread: 4agze Cams?

  1. #1
    Senior Member briigo82's Avatar
    Join Date
    Dec 2010
    Name
    Josh
    State
    qld
    Location
    Strathpine
    Country
    australia
    Posts
    238

    Default 4agze Cams?

    Lads

    Ive been contemplating lately a few cool mods I can do to my daily driven smallport gze. Atm its running a factory cooler, pulley and factory ecu. Only mods are a 20v headers and the abv mod.

    Ive got a set of 270* 8.1mm lift cams lying around not doing anything and was thinking how cool ot would be to have big cams again but is there any advantage in running cams of this size or not? Would bigport cams be better suited to it?

    And I am planning on changing to a fmic and a nevo pully as well. (have both ready to go)

    Discuss





  2. #2
    Veteran Jimmee1990's Avatar
    Join Date
    Mar 2011
    Name
    James
    State
    VIC
    Location
    Mt Dandenong
    Country
    Australia
    Posts
    1,132

    Default

    I would say the cams would definitely help, more so with the better cooler and more boost. 270 degree with 8.1mm lift is perfectly fine on my n/a daily (even gets better fuel economy than before) so I can't see them having any negative effects combined with the supercharger.

    Definitely not an expert with supercharged engines however.

  3. #3
    Senior Member jaz_ae86's Avatar
    Join Date
    Dec 2008
    Name
    Jason
    State
    SA
    Location
    Southern Suburbs
    Country
    Australia
    Posts
    176

    Default

    If you have a way of monitoring inlet temp then it may be worth while but I doubt it.

    The supercharger is positive displacement pump, giving fixed volume of air per revolution. It produces more air than the motor can consume thus creating postive pressure in the inlet manifold. That is, boost pressure is generally measured in the inlet manifold, so you are measing the backpressure of the supplied air to that which can pass through.

    Going larger cams will allow more air to pass through the motor, unless you adjust the cam timing to minimise overlap but you will lose what your trying to gain.

    For a turbo motor it is automatically compensated via the wastegate, but for a supercharged motor it simply means less manifold pressure. Cleaner combustion due to additional scavange doubtful to make up for the short fall.

    This is a theoretical reason and I am happy to be proven wrong. If you had 256's I'd say go for gold, 264 worth a try, 272 please prove me wrong but I would be monitoring inlet air temp as a measure of how hard the supercharger is working.

  4. #4
    Hair model Jacobxxx's Avatar
    Join Date
    Oct 2009
    Name
    Jacob
    State
    QLD
    Location
    Sunshine Coast
    Country
    Australia
    Posts
    6,963

    Default

    I'd change pulley before doing cams

    14psi is your friend

Similar Threads

  1. 4AGZE injectors, cams, 4ac
    By PHAT86 in forum Car Parts For Sale
    Replies: 2
    Last Post: 19th March 2012, 12:58 AM
  2. Big port cams into 4agze
    By ae86 slide in forum Technical - Questions
    Replies: 19
    Last Post: 15th April 2010, 01:35 PM
  3. What are the specs on std 4agze cams?
    By Dongaz in forum Technical - Questions
    Replies: 6
    Last Post: 31st March 2008, 09:22 PM
  4. sc12 4agze intake manifold bp cams
    By methodman in forum Car Parts For Sale
    Replies: 8
    Last Post: 31st October 2007, 08:03 PM
  5. 4agze and aftermarket cams
    By Jonny Rochester in forum Technical - Questions
    Replies: 0
    Last Post: 8th June 2005, 09:53 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •