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Help with engine differences Between 81 1100E & 1100EFE

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    Help with engine differences Between 81 1100E & 1100EFE

    Hey Guys
    This is my first time up, so i hope you can help.
    I have a 81 GSX1100E that i have been building as a period 5 vintage superbike. I do have some nice parts on it, but i am looking at buying a spare motor for it so i can build up a spare monster engine for it without disturbing my current one till i'm ready.
    I have come across a complete EFE engine with a couple of spare heads and another disassembled engine for a decent price.
    My question is, i have to use a pre 83 bottom end to stay within the period 5 reg's, so will the EFE barrels and/or top end fit on the 81 cases?
    While i have your attention can you also tell me if there is any differences between the mounting points on the bottom end on the 2 engines?
    It's a pretty sweet build actually, I mightn't beat those super expensive XR69 Replicas that are out there but i'm going to have a whole lot of fun trying.
    cheers.

    #2
    Originally posted by GSXRacer View Post
    Hey Guys
    This is my first time up, so i hope you can help.
    I have a 81 GSX1100E that i have been building as a period 5 vintage superbike. I do have some nice parts on it, but i am looking at buying a spare motor for it so i can build up a spare monster engine for it without disturbing my current one till i'm ready.
    I have come across a complete EFE engine with a couple of spare heads and another disassembled engine for a decent price.
    My question is, i have to use a pre 83 bottom end to stay within the period 5 reg's, so will the EFE barrels and/or top end fit on the 81 cases?
    While i have your attention can you also tell me if there is any differences between the mounting points on the bottom end on the 2 engines?
    It's a pretty sweet build actually, I mightn't beat those super expensive XR69 Replicas that are out there but i'm going to have a whole lot of fun trying.
    cheers.

    you cannot run the efe head the rocker cover gives away the fact its a 84 motor and the cutoff date is dec 82

    ozman

    Comment


      #3
      The barrels bolt right on but the pistons do not. You can get an 1100 piston kit to use the same crank and boost some CCs.
      The wrist pins on the early 1100s are 18mm and the efe is 20mm.
      You can do this and use the early head so you don't tell on yourself.
      1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
      1985 GS1150ES stock with 85 Red E bodywork.

      Comment


        #4
        Thanks guys, looks like i will have to keep looking.
        On another note do you have any experience on what is a good road race grind cam for my 81 1100E motor? I have a 1166 wiseco kit and a very well ported head with stainless O/S valves and i'm running a big bore Yoshi exhaust with it.
        Lots of info for drag use but not much info for road race use.
        Anyone have any suggestions on what works well?

        Comment


          #5
          Originally posted by GSXRacer View Post
          Thanks guys, looks like i will have to keep looking.
          On another note do you have any experience on what is a good road race grind cam for my 81 1100E motor? I have a 1166 wiseco kit and a very well ported head with stainless O/S valves and i'm running a big bore Yoshi exhaust with it.
          Lots of info for drag use but not much info for road race use.
          Anyone have any suggestions on what works well?

          give mick dewitt a ring he does my dyno work preety good on the cam setups to
          he is at monbulk in melbourne

          DEWITT MOTOSPORT
          0408397799

          Comment

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