Go Back   DIY Go Kart Forum > Building Plans And Advice > Engines & Clutches

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 05-02-2019, 04:47 PM
Ted83 Ted83 is offline
Junior Member
 
Join Date: May 2019
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Default Gx160 crankshaft length?

Hi, just trying to fut a torque convertor to a gx160 but it seems as if the 3/4 shaft from the engine is too short. There is about 1 inch from the outer face to the end of the crankshaft output.
Is this normal or is there different length crankshaft's?
Thanks in advance.
  #2  
Old 05-02-2019, 04:51 PM
JTSpeedDemon's Avatar
JTSpeedDemon JTSpeedDemon is offline
Currently flathead-crazed
 
Join Date: Jan 2019
Location: Texas
Posts: 2,482
Thanks: 615
Thanked 325 Times in 297 Posts
Default


I've never heard about different length crankshafts. Please post pics of what you mean, because you may be mixed up with how the TC goes together. Or something. But something smells a little off here.
__________________
"(Speed Demon)Speedin' on the freeway, gotta get a leadway..." -Michael Jackson
  #3  
Old 05-02-2019, 05:12 PM
Ted83 Ted83 is offline
Junior Member
 
Join Date: May 2019
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Default

https://ibb.co/By1kxsh

This look normal?
  #4  
Old 05-02-2019, 05:17 PM
JTSpeedDemon's Avatar
JTSpeedDemon JTSpeedDemon is offline
Currently flathead-crazed
 
Join Date: Jan 2019
Location: Texas
Posts: 2,482
Thanks: 615
Thanked 325 Times in 297 Posts
Default

I personally don't have experience with TCs, but this picture might help. Looks normal to me.
Attached Thumbnails
TC.jpg  
__________________
"(Speed Demon)Speedin' on the freeway, gotta get a leadway..." -Michael Jackson
  #5  
Old 05-02-2019, 05:19 PM
Ted83 Ted83 is offline
Junior Member
 
Join Date: May 2019
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Looks similar. Not much to go onto! Might be normal and worrying for nothing.
  #6  
Old 05-02-2019, 06:17 PM
950speed's Avatar
950speed 950speed is offline
Senior Member
 
Join Date: Jun 2018
Location: Liberty Hill, Texas
Posts: 360
Thanks: 70
Thanked 40 Times in 37 Posts
Default

Yes that looks completely normal, it’s the same for me. Nothing you would have to worry about

Correction always worry and be prepared but have fun.
Make sure the bolt is long enough and maybe but a dab of blue loctite on it. I learned the hard way, my bolt was too short.
  #7  
Old 05-02-2019, 09:36 PM
itsid's Avatar
itsid itsid is offline
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,195
Thanks: 1,393
Thanked 4,287 Times in 3,221 Posts
Default

Well crankshafts were longer back in the good ol days..
then some stupid chinese company cut it short (by about an inch) on behalf of horror fraud
to prevent it from being conveniently used on karts and bikes and such.
(also cheaper )

And even Honda followed that example..
and nowadays 3/4" shafts are more or less all to 58mm in length (2.3")
(were 72mm or 80mm before IIRC)

So you can make a spacer from a 3/4" core drilled and keyed shaft
have the key spanning the original PTO and the extension
(and that short enough for the clutch/TC not to have lateral movement)
and you should be okay.

Many just run a long enough bolt to fix the TC driver and call it good.. so far I haven't heard of any such "bolt only" failing.

So either way it should work

'sid
__________________
Jokes about german sausage are the wurst.
  #8  
Old 05-03-2019, 08:55 AM
J.S.@SMS's Avatar
J.S.@SMS J.S.@SMS is offline
Here 8am-? Mon-Fri
 
Join Date: Sep 2018
Location: Weeki Wachee Fl.
Posts: 566
Thanks: 59
Thanked 103 Times in 90 Posts
Default

Another reason that some engines have a shorter shaft than they used to, is because of the centrifugal clutch. I have found that a TC driver hangs off the end about an inch, while a centrifugal clutch only hangs off about an eighth ish of an inch.
__________________
If a picture is worth a thousand words, then how about a video?
  #9  
Old 05-03-2019, 09:41 AM
950speed's Avatar
950speed 950speed is offline
Senior Member
 
Join Date: Jun 2018
Location: Liberty Hill, Texas
Posts: 360
Thanks: 70
Thanked 40 Times in 37 Posts
Default

Quote:
Originally Posted by itsid View Post
Well crankshafts were longer back in the good ol days..
then some stupid chinese company cut it short (by about an inch) on behalf of horror fraud
to prevent it from being conveniently used on karts and bikes and such.
(also cheaper )

And even Honda followed that example..
and nowadays 3/4" shafts are more or less all to 58mm in length (2.3")
(were 72mm or 80mm before IIRC)

So you can make a spacer from a 3/4" core drilled and keyed shaft
have the key spanning the original PTO and the extension
(and that short enough for the clutch/TC not to have lateral movement)
and you should be okay.

Many just run a long enough bolt to fix the TC driver and call it good.. so far I haven't heard of any such "bolt only" failing.

So either way it should work

'sid
Well you can now say you have heard of a “bolt only” failing. Scared the daylight out of me, luckily I had a helmates because the “cover” I guess you would call it, if the driven pulley, hit the back of my head and the rest went rolling down the road.
Big lesson learned that day, MAKE SURE your bolts are long enough, mine was only in about 5 threads and backed out, causing the setup to fail
The Following User Says Thank You to 950speed For This Useful Post:
itsid (05-03-2019)
  #10  
Old 05-03-2019, 11:12 AM
itsid's Avatar
itsid itsid is offline
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,195
Thanks: 1,393
Thanked 4,287 Times in 3,221 Posts
Default

oops..
Sorry you had to be the first

'sid
__________________
Jokes about german sausage are the wurst.
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 03:53 AM.