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Thread: 18RG slight mods

  1. #1
    Forum Member
    Join Date
    Feb 2019
    Location
    VIENNA
    Posts
    3

    Question 18RG slight mods

    Hi guys, ive a chance to replace my 18R engine to a 18RG for my 77 Celica RA28. I have a few questions what make sense to modify slightly power especially low end and mid range.

    The guy who will sell and overhaul engine, chains and gasket kits, suggested the following:


    adapting compression to 10:5:1, keeping all internals as is, except the cyl head gasket, without replacing pistons, camshaft and valves. Is this really possible?
    replacing header to 4:2:1 - mine is a left hand drive dont know where to buy unfortunately.
    keeping the Mikuni oem 40s and adapting jets and venturi..Do you have suggestion or experience to power up the existing carbs?
    changing clutch and lighter flywheel.
    He also has a 45 intake manifold for the RG but dont know whether its worth it buying 2 Weber or Mikuni 44s, to power up at low and midrange

    What do you think? Your inputs are really much appreciated. Thank you very much in advance for your replies.
    Sergi

  2. #2
    Junior Member Backyard Mechanic
    Join Date
    Sep 2007
    Location
    Georgia
    Posts
    270

  3. #3
    Junior Member Backyard Mechanic
    Join Date
    Sep 2007
    Location
    Georgia
    Posts
    270

    Default Re: 18RG slight mods


  4. #4
    Junior Member Grease Monkey
    Join Date
    Nov 2006
    Location
    ACT
    Posts
    80

    Default Re: 18RG slight mods

    I kind of doubt that a head gasket will take 8.5 to 10.5. Piston swap will be needed and you don't need anything else to get to 10
    Yes the old Celica's are great cars thanks..

    76 RA23 18RG
    85 GSXR 750 05 GSXR 750 77 RD400



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