Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. Collapse Details
    How much power can a 1 1045 shaft handle?
    #1
    Senior Member
    Join Date
    Jun 2015
    Location
    Texas Panhandle
    Posts
    540
    Default
    When I built the VFR buggy I connect the VFR800 engine to the drivetrain via a 1 diameter 1045 carbon shaft and it held up really well. The buggy Im working on now, though, weighs about 800lbs more and the 954RR engine Im using makes another 10lbs of torque and 50 more horsepower. Im more concerned about the weight than I am the power.


    My setup is going to be:


    954RR engine, 5th gear (1:1), 16t sprocket
    Jack shaft, between 18 and 22 inches long, 34t sprocket on either end
    Geo Metro 5 speed manual transmission, 16t sprocket on input shaft


    Right now my plan is to use the same 1045 1 od shafting from the jackshaft and input shaft on the transmission (the transinput is a 22mm splined shaft anyway). Im currently tooled to where i can make the 1 stuff on the fly, and im probably going to stick with this because the cost of replacing broken parts is significantly less than retooling for a larger shaft, but Im interested in hearing arguments for going larger.


    At the heart of it, though, do you think a 1 carbon jack shaft is up for 70lbs of torque and 150hp in a 1600lb buggy?
    Reply With Quote
     

  2. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #2
    Millenium Member Deranged's Avatar
    Join Date
    Sep 2008
    Location
    Allendale MI
    Posts
    2,043
    Default
    If it's any help,
    I am selling a rear center spool from my car. I am updating it to a new design for my Hayabusa powered car. Let me know if you are interested.

    Justin
    Nowhere near the desert.
    Reply With Quote
     

  3. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #3
    Senior Member
    Join Date
    Jun 2015
    Location
    Texas Panhandle
    Posts
    540
    Default
    Can’t lose reverse . I’m pretty confident in the route i’m going, the 1” jack shaft is really the only bit that concerns me. I’d like to go with something heavier but doing so eats up too much of my budget and will makeit more difficult for me to manufacture replacements.
    Reply With Quote
     

  4. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #4
    Millenium Member Deranged's Avatar
    Join Date
    Sep 2008
    Location
    Allendale MI
    Posts
    2,043
    Default
    Ahh,
    Thant makes sense. Maybe the spool could be used as the jackshaft?

    Justin
    Nowhere near the desert.
    Reply With Quote
     

  5. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #5
    The Wizard bdkw1's Avatar
    Join Date
    Jul 2006
    Location
    Easton, KS
    Posts
    4,362
    Default
    Switch to 4340 and have it heat treated, End of problem.

    Also, HP does not kill parts, torque and gear reduction does.
    Reply With Quote
     

  6. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #6
    Millenium Member plkracer's Avatar
    Join Date
    Aug 2006
    Location
    Monroe Wa
    Posts
    3,590
    Default
    At least go for a piece of 1144. Already in the strengthened condition, and it is intended for shafting.

    So you are 16-34-16 gear ratio in the end? (1:1) the shaft will see double the torque of the counter shaft, which would be fine, given you keep it in 5th, and keep the overhang from the bearings low.

    I was able to twist heat treated 1045, 1-3/8 diameter with my gsxr750, which was 13t-60t.
    Reply With Quote
     

  7. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #7
    Senior Member
    Join Date
    Jun 2015
    Location
    Texas Panhandle
    Posts
    540
    Default
    I figured keeping the ratios 1:1 would only see the 70lbs or so of torque from the engine. The only reason i’m planning on going with the 34t sprockets is just to make the chains longer. I could keep it 16t all in and out. I want the jack shaft to be a weak link in the build (cheap to make and field replaceable), but if it’s not balanced i would think it’d fail rather rapidly. I really didn’t think about the load that way.

    the plan is to have bearings at either end, sprockets mounted inboard at the bearings, then a support bearing in the middle. The transaxle will have a 3/8” plate over most of the bellhousing with a square bearing mounted in the middle on the outside. I’m considering havinga bearing inside and outside the plate...i don’t believe the shaft can be “too supported”, but i just don’t know if it’ll actually carry any load.
    Reply With Quote
     

  8. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #8
    The Wizard bdkw1's Avatar
    Join Date
    Jul 2006
    Location
    Easton, KS
    Posts
    4,362
    Default
    Quote Originally Posted by makenzie71 View Post
    I figured keeping the ratios 1:1 would only see the 70lbs or so of torque from the engine.
    That's going to be a lot of RPM for the input shaft, more than double what they were designed for.
    Reply With Quote
     

  9. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #9
    Senior Member
    Join Date
    Jun 2015
    Location
    Texas Panhandle
    Posts
    540
    Default
    The same transmission is used on some other engines that rev a bit higher so i don’t think the rpm will be a significant issue...but my choice was either throw half again the rpm at it, which really wouldn’t happen very often, or throw 3-6 times more torque than theywere designed to handle, which would happen every time i opened the throttle.

    i did decide to go with 18t sprockets on the jackshaft and i put shaft so there will be tiny bit of reduction.
    Reply With Quote
     

  10. Collapse Details
    Re: How much power can a 1 1045 shaft handle?
    #10
    The Wizard bdkw1's Avatar
    Join Date
    Jul 2006
    Location
    Easton, KS
    Posts
    4,362
    Default
    Quote Originally Posted by makenzie71 View Post
    954RR engine, 5th gear (1:1),
    I keep forgetting the primary reduction, Must be getting old.......

    Your gear reduction in 5th is actually 1.956-1.

    Specs I pulled were from here. https://www.aperaceparts.com/tech/CBR954RR.html

    So 146ftlb's to the input shaft. Seems doable, also helps with the RPM.
    Reply With Quote
     

Page 1 of 2 1 2 LastLast

Similar Threads

  1. So how much can it handle?
    By i ride sand in forum Driveline
    Replies: 10
    Last Post: 10-16-2014, 08:45 PM
  2. 250 needs more power
    By seanyb in forum Motor - Engine
    Replies: 12
    Last Post: 07-13-2009, 04:31 AM
  3. enough power???
    By nvr2ruf in forum Ridge Runner
    Replies: 12
    Last Post: 03-13-2009, 07:27 AM
  4. Will Polaris Transmission Handle M/C Engine Power?
    By Kawabuggy in forum Driveline
    Replies: 27
    Last Post: 11-26-2008, 08:07 PM
  5. More Power....
    By n8lerma04 in forum Motor - Engine
    Replies: 2
    Last Post: 11-10-2008, 08:10 AM

Tags for this Thread

Bookmarks

Posting Permissions

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