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01-10-2009, 11:27 AM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Now, things get interesting.
Between the red arrows, you can see a bright, shiny ring that goes all the way around the very end of the pin. That ring is where the black oxide coating has been scraped off the pin as it was tightened into the hub adapter.
That ring is the ONLY contact point where the male taper of the pin contacts the female taper of the hub adapter. Notice it does NOT make full contact. 
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01-10-2009, 11:29 AM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
The yellow arrow shows the machining marks from the lathe that was used to make the taper.
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01-10-2009, 11:32 AM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
The blue arrow points to junk from the black oxide process.
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01-10-2009, 11:41 AM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Now, this is a pin from CNGreen. It is most interesting. I doubt he even saw this.  
This is a Trigo pin. The taper has actually started to crack. Again, notice the thin, shiny ring where the contact angle of the pin did not line up to the countersink on the hub adapter. Thankfully, he sent me his hub adapter as well.
This should put to rest the nonsense of outside corners not being stress raisers--this picture states other wise. ANY sharp edge is a potential to cause you grief.
The tape around the pin marks it as coming from CNGreen. (Had to keep all this stuff straight).
The plot thickens...
Last edited by David Kirkham; 01-10-2009 at 11:44 AM..
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01-10-2009, 11:50 AM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Here is the hub from CNGreen. This is a Trigo hub adapter.
Again, notice the shiny ring where the pin contacted the hub adapter. Notice it is extremely small. This is not a good situation.
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01-10-2009, 12:00 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
This is an exaggerated view of what is going on.
This picture is of a Trigo pin. The pin is lathed to a 76 degree taper and the hub adapter is represented by the red lines.
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01-10-2009, 12:01 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,409
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Not Ranked
Interesting, but I wonder how this fit-up differs from the hundreds of millions of regular passenger cars on the road today with regular lugs nut holding their wheels on? Still, it doesn't reflect well on the quality control practices in place of these preminm wheel manufacturers does it.
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01-10-2009, 12:09 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Quote:
Originally Posted by Blas
Interesting, but I wonder how this fit-up differs from the hundreds of millions of regular passenger cars on the road today with regular lugs nut holding their wheels on? Still, it doesn't reflect well on the quality control practices in place of these preminm wheel manufacturers does it.
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I am quite sure regular passenger cars have very carefully controlled tapers that match between the lugs and wheels. Their quality control is really quite good.
As I explain more of what is going on, I think you will agree with what I think is going on.
David
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01-10-2009, 12:12 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
In this picture, I flipped the pin over so it would be easier to understand what is going on.
The pink and green lines represent the wheel pushing on the pin during acceleration or braking.
The red line represents the 90 degree taper of the hub adapter. (I have exaggerated the angle to make it easier to see what is going on.)
The yellow line follows the 76 degree taper of the pin.
The blue lines represent your underwear.
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01-10-2009, 01:39 PM
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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Sadly, that problem has been around for years with "wheels sticking" (due to non-concentric nuts)
I had new nuts done for my clients in Germany and South-Africa since years.
Gladly, we found someone to take on the problem in the US and solve it with the help of all here :-)
Ironically, Kirkham does not even use that setup!
Now we can start a new thread about the spinners...
Dom
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