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Sean Burke
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Any hotbits owners have wornout top bearings?
January 05, 2012 05:17PM
Changing the worn out spherical bearing on the top mount of a set of hotbits DT2 shocks. How do they come off?

-Sean Burke
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john vanlandingham
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Re: Any hotbits owners have wornout top bearings?
January 05, 2012 05:55PM
Quote
Sean Burke
Changing the worn out spherical bearing on the top mount of a set of hotbits DT2 shocks. How do they come off?

-Sean Burke

First you disassemble them, and remove the bearing....reassemble in reverse order.



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PotatoFlakeSTi
Joachim Sandgaard
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Re: Any hotbits owners have wornout top bearings?
January 05, 2012 08:40PM
No idea... but I need mine serviced :|
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john vanlandingham
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Re: Any hotbits owners have wornout top bearings?
January 05, 2012 10:04PM
Joking aside, boys, OK. Everything I have seen out of Asia for aftermarket top mounts come with really undersized spherical bearings period.

Wgen I was collecting Ford 909 Motorsports parts way back when, first thing I did was look at differences between "GpN" (standard road car stuff in design) and Group A and World RallyCar stuff and measured everything.
The most obvious was the tops of the strut insert:


The fat pin is 20mm on the Group A and the threaded part is M12 x 1.5
(keeping this relevant to those Sub-a-rat things before you guys bitch me out about "what da fawk duz dis haz to do wif my beloved Impretzled?? or your attention span peters out, note that your pins are 15mm where the top mount bearing fits and M12 thread---and Group A Subies had in the mid 90s a 19mm fat pin like the Fords--which was hollow inside saveing a whopping 8 grams)(ask how we found that out!)
Ford used a 22mm high-misalignment bearing that looks like this>


Typically I see the generic Japoniasie (and other Asian stuff probably made in China) stuff around 15-16mm and I say its undersized

Strength of round things goes like radius squared to the 4th power, so a couple of mm is a tremendous increase in strength--that's why i say go up to M14 wheel studs--.

Anyway don't belive me, but look up what Subaru just homologated in GroupN for the new Sucus: (can't find it dammit, but what i saw just 2 weeks ago was new Homologated sperical bearing top mounts...
And the ID was.......

WAS......................................................




WAS


22mm.

You boys oughtter study the mounts and see if there was a way to get them modded up to what some smrat guys have decided is the right size...

Oh, 22mm in mythical kings segment of his thumb is 0.866
7/8" is .875
And 7/8" costs a lot less than 22mm


Oh, found it:
http://www.sti.jp/e/competitor/r4_homologation/data/2011/n5738/N5738_0301_VR4.pdf

We don't have to be tooo smart and heaven forbid that anybody should ever accuse me of being smrat, but I am astute enough to learn from those with a lot more resources and more riding on their decisions...

You guys came get smart, too.



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Anders Green
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 08:46AM
I first read the thread title as "Any hobbits with wornout...."


winking smiley



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mothra
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 11:48AM
Quote
Anders Green
I first read the thread title as "Any hobbits with wornout...."


winking smiley


I really don't need to know how you wore out the top bearing on a hobbit!



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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 03:07PM
Hey John, you are way off message here.



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john vanlandingham
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 03:56PM
Quote
wvonkessler
Hey John, you are way off message here.

Uh, say what? Dey wanna rebuild their top mounts, then rebuild them to the right size, that sounds like a better message, dun' it?



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Sean Burke
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 06:37PM
Yeah, I know my stuff is obviously inferior...bla...bla...bla... Again, would anyone like to tell me how to replace hotbits top mount bearings. Has anyone experienced these wearing out rapidly.
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PotatoFlakeSTi
Joachim Sandgaard
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 06:56PM
Thought the DT2 piston "pins" were 22mm.

Also, I feel like a dog who just shit on the floor when John yells in my direction.

Disclaimer Edit;




Edited 2 time(s). Last edit at 01/06/2012 07:08PM by PotatoFlakeSTi.
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Tim Taylor
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 08:14PM
Quote
Sean Burke
Yeah, I know my stuff is obviously inferior...bla...bla...bla... Again, would anyone like to tell me how to replace hotbits top mount bearings. Has anyone experienced these wearing out rapidly.

There are only a couple of ways to mount spherical bearings. Cheapest it to just press them in from the bottom, next would be some sort of retaining ring, most expensive is some sort of threaded retainer. I've never seen what you're working on but my money is on a press fit. Find a socket that matches the bearing size and use the inertia press (aka hit it with a hammer) Maybe a picture of the hobbit in question would help winking smiley
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john vanlandingham
John Vanlandingham
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 09:19PM
Quote
PotatoFlakeSTi
Thought the DT2 piston "pins" were 22mm.

Also, I feel like a dog who just shit on the floor when John yells in my direction.

The shaft may be 22---you have it right there, maybe you could measure.
But the bearing ID who knows....
Seems like nobody can get an answer.....
maybe you could measure that too.
If you don't have these:


Get some.
Then you can measure the ID, OD and width.

and, who's yelling?

confused smiley



John Vanlandingham
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john vanlandingham
John Vanlandingham
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Re: Any hotbits owners have wornout top bearings?
January 06, 2012 09:22PM
Quote
Sean Burke
Yeah, I know my stuff is obviously inferior...bla...bla...bla... Again, would anyone like to tell me how to replace hotbits top mount bearings. Has anyone experienced these wearing out rapidly.

Are you seriously acting like you have been scolded? The subject is the bearing needing replacement..
Phrase it like this "The Hotbits bearings........"

then you won't feel the subject is you and "my"...

But aren't you glad that there may be a way to really improve the stuff??



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Nubby
Tony Wells
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Re: Any hotbits owners have wornout top bearings?
January 09, 2012 11:46AM
Yeah, I've replaced one.

The top mount is in two pieces held together with little allen screws, so first break the top mount into two parts. The spherical bearing will drop out the bottom and what I did was find an appropriate sized socket and used it to tap out the bearing. Did the same thing to put in the new bearing, just used a socket that matched up to the race and used it to tap it in. They're press fit in there, but not super duper tight so they go in and out fairly easily.

I got the replacement bearings from Davenport Racing and I remember Doug saying something about trying to find a domestic source for the replacements and the new ones seem to be of better quality. A couple years of RallyX on a pretty rough site killed that first bearing, only one stage rally on the new one but it's still in one piece.
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EricW
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Re: Any hotbits owners have wornout top bearings?
January 09, 2012 12:28PM
That's a good point - any guess on how many events these bearings should hold up? I just put in new rear mounts because I bent the GrpN mounts with my hit at Black River and I'm curious what I'm going to need to do to service these and what timeframe I'm looking at?
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