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  1. #1
    mrbtd's Avatar
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    Anyone with 100+ hours on a 1400 ?

    I am seriously considering a Lowell or TJ 1400 set up but I am concerned about its durability.

    Does anyone have 100+ hours on a 1400 top end ? I want the ski to be nothing more than a hard hitting 75+ ski that I can put through hell.


  2. #2
    philip_gpr's Avatar
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    durability is not really effected by cylinder size - for example, you can make a 1390 more durable than a ported 1300 if you wanted

    the biggest thing that can effect durability is the size of the exhaust port

    the bigger the port the faster the rings wear

    to increase ring life you could instruct the person doing the porting to keep the exhaust port smaller - I think it would help to also keep the port more circular in shape (versus rectangular)

    because we use pump gas we all tend to run relatively low compression so that isn't too much of an issue
    Last edited by philip_gpr; 11-27-2007 at 05:22 PM.

  3. #3
    mrbtd's Avatar
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    Quote Originally Posted by philip_gpr View Post
    durability is really effected by cylinder size
    You mean isnt effected right ?

  4. #4
    Moderator OsideBill's Avatar
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    Longevity will depend on how you spec it out to the engine builder. Like Phillip said radical porting and higher compression will push it towards the edge. Piston coatings like Swaintech are a big help also. I had larger windows cut in my piston, this helps to keep the under side of the piston crown cooler. I plan on having this engine for a long time. I invested a good chunk of change in this. I was told warming up my engine will be a key factor in prolonging it's life with the forged pistons, pretty much this applies to all engines but is more critical with the forged pistons. It was also suggested to me that at the end of the first year of use I should do a tear down and have the piston skirts re-coated.

  5. #5

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    GOOD INFO GUYS!!! I'm getting close to going BIG BORE as well and I'm still undecided on how big or if i want to put pipes on it. Y'all keep on talkin' , ya hear.

  6. #6
    philip_gpr's Avatar
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    You mean isnt effected right ?

    oops - yes (I fixed my typo)

  7. #7
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    my 1390 bb GK has 45-50 hrs on it since the upgrade.. the motor its self had 80 hrs on it then.i have never touched the lower end.
    I have a key way 3* and a bunch of stuff on it. I warm it up ALL ways thats a law with alum. motors... I actully heat cycle it... i start it for 30 sec at a low rpm on the trailer,,,, about 20 minutes before i leave home.. then warm it on the trailer before lanch. then after i lanch i ride softly until i feel the motor is ready...
    after that..... she runs WOT....for the rest of the day...

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