which gs1100 engine do i want?
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which gs1100 engine do i want?

This is a discussion on which gs1100 engine do i want? within the Technical forums, part of the Caferacer.net Forums category; Hello everyone, i have a 81 gs750 i want to put a 1100 engine in. Im planning on building this engine up threw time. Ive ...

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Thread: which gs1100 engine do i want?

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    Junior Member jl22n's Avatar
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    which gs1100 engine do i want?

    Hello everyone, i have a 81 gs750 i want to put a 1100 engine in. Im planning on building this engine up threw time. Ive read the newer like an 88 gsx1100 katana engine make the most power stock, but will it fit in my frame without a ton of fabricating? Which 1100 engine is the disired one that all the drag guys want or is it all of them basically?

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    Senior Member kochic's Avatar
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    All GSXR oil cooled fit with adaptor plates.Plans are "everywhere".
    Gs1100 4v and 1150 fits too with bottom engine mounts.
    Both are easy mod.
    Marc
    honda cb350 1973
    suzuki gs1000 1978

  3. #3
    Senior Member hillsy's Avatar
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    The GSX / GSXR motors (oil cooled) are shorter in length than the air cooled GS mills - which means you either have to place the motor forward in the frame (clears the headers, but moves the sprocket away from the swingarm pivot) or rearward (keeps the sprocket close to the swigarm pivot, but requires custom headers). Technically, keeping the motor rearward is better for chainline wear / preservation, but most people run them at the front as it's easier in the long run.

    But to answer your question, any GS1000, 1100 or 1150 (air cooled) will fit in with the least amount of headaches. They also have the roller bearing cranks which the drag guys find hard to kill.

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    Senior Member KeninIowa's Avatar
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    The black-cased 83 motors are supposed to be the best of the 1100s, not sure I buy there's a difference.

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    Junior Member Saltyasf's Avatar
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    Is this possible I've got a 78 gs750 and I'm about to buy a 79 gs1100 how tough would the mock up mounts or will it bolt up and what else should I worry about

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    Junior Member charles's Avatar
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    Quote Originally Posted by Saltyasf View Post
    Is this possible I've got a 78 gs750 and I'm about to buy a 79 gs1100 how tough would the mock up mounts or will it bolt up and what else should I worry about
    The 1100 will bolt straight in, no mods required, the only thing to worry about is an existing smoking problem, I suspect the frame on your bike is an oil cooler and is leaking somewhere.

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    Senior Member gs1327's Avatar
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    Quote Originally Posted by charles View Post
    The 1100 will bolt straight in, no mods required, the only thing to worry about is an existing smoking problem, I suspect the frame on your bike is an oil cooler and is leaking somewhere.
    No matter how many times I read this, I can't figure out what it means.

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    Senior Member hillsy's Avatar
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    Quote Originally Posted by Saltyasf View Post
    Is this possible I've got a 78 gs750 and I'm about to buy a 79 gs1100 how tough would the mock up mounts or will it bolt up and what else should I worry about
    It would be pretty hard to fit one of these seeing as Suzuki didn't make 1100's until 1980.

  10. #9
    Senior Member jalsteve's Avatar
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    if you must fit a big engine in the GS750 frame, though not sure which bike you actually have as the GS750 was made from 76 till 78 and is a 2 valve engine, I guess you must have a GSX750 air cooled 4 valve? But why not buy a complete gs1100, Kat, EF or EFE and just have done! But if you must the GSX1100EFE and later engine (1984-87) is bullet proof and has some improvements over earlier engines. I have one in a Spondon frame at 1260cc, Dyno'd 142hp at the back and 92ftlbs of torque at 7500rpm it's tractor engine.

    As an alternative, the smaller and lighter is the GSX750 TSCC engine from 83 and 84 (not later as the 750s became 700's), its quicker motor than the GS1100 for street use without spending a penny assuming its in good nick. The early GSX750 was re designed for the new Superbike racing class (750cc) in 1983, the Suzuki 750 TSCC (twin swirl combustion chamber) was the result.

    I guess it depends what you are going to use the bike for, if entering field ploughing competitions then go for the GSX1100EFE, if you want something a bit lighter and ultimately a more useable bike then go for the GSX 750 TSCC (an engine that is often overlooked).

    As a foot note, the cranks on GS and GSX engines are roller big end, they are strong but a crank build isn't cheap. Some weld for strength (drag and track racing) but that a one way trip as once welded the crank is not re-buildable.
    Last edited by jalsteve; 09-27-2017 at 01:15 AM.
    Lite the blue touch paper and stand well back!

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    Junior Member Iguana's Avatar
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    GS 1000/1100 engine interchangeability.....

    Quote Originally Posted by charles View Post
    The 1100 will bolt straight in, no mods required, the only thing to worry about is an existing smoking problem, I suspect the frame on your bike is an oil cooler and is leaking somewhere.
    Charles....thanks for your inspiring advice. I have a 1981 GS1000g with Wiseco 1100 kit in it. Good power etc etc, but I have inadvertently gapped the rings too wide and bike now uses oil & has blow-by......my own stupid fault! I can access a GS1100g engine locally or pull the existing engine down again & fit new rings. If the GS1100g is a direct replacement engine that would be fine. Do you know of any other 'traps' I might encounter in doing this changeover?

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