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Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
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William French
Joined: 25 Mar 2008
Posts: 399
Location: United States, Michigan, Motor City
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 Posted: Thu Dec 15, 2011 1:41 pm Post subject: Wow |
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| That's amazing. |
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Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
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| Posted: Thu Dec 15, 2011 1:54 pm Post subject: |
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I'd pass on the one in the middle. The "blueprinted" one on the right with the straight through modification looks like it would work best on my air pump.
Last edited by Brian Lohman on Fri Dec 16, 2011 6:59 pm, edited 2 times in total |
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John Savage
Joined: 30 Jan 2002
Posts: 1252
Location: United Kingdom (Great Britain), not USA state,
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| Posted: Thu Dec 15, 2011 6:12 pm Post subject: |
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There is always someone who thinks that they can beat Tech, these examples were found very quickly using a ball bearing of the correct size dropped into the exhaust and rolled around the bend or in the case of these examples not rolled around the bend 
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Chuck Parker
Joined: 04 Mar 2007
Posts: 506
Location: United States, New Jersey,
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| Posted: Thu Dec 15, 2011 7:03 pm Post subject: |
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Assuming all three would pass tech, I would want the one that produces the best lap time. Damn, there's that testing thing again.
Are you trying to show that rotax pipe specas are all over the map? |
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Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
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| Posted: Thu Dec 15, 2011 7:55 pm Post subject: |
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| John Savage wrote: | | these examples were found very quickly using a ball bearing of the correct size dropped into the exhaust and rolled around the bend |
John, you mean using a ball bearing one size larger than legal? Which outlet diameter is legal in your eyes. The dime(middle), quarter(left) or half-dollar(right) sized one?
Are they really being manufactured with that much discrepancy or were they opened up, modified and re-powder coated? |
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Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
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| Posted: Thu Dec 15, 2011 8:23 pm Post subject: Re: Wow |
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| William French wrote: | | That's amazing. |
William, enlarge that picture to 400% and see how much more amazing it is 
That pipe on the right is probably worth 3/4 - 1 second per lap at a longer track. |
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Ray Chiappe
Joined: 12 Apr 2003
Posts: 802
Location: United States, Nevada, Henderson
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| Posted: Thu Dec 15, 2011 8:41 pm Post subject: |
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| Which one is the legal one?? |
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Tony Tesoro
Joined: 21 Aug 2007
Posts: 81
Location: United States, Florida, tampa
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| Posted: Fri Dec 16, 2011 4:15 pm Post subject: |
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| Which ever one you get away with. |
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Tony Tesoro
Joined: 21 Aug 2007
Posts: 81
Location: United States, Florida, tampa
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| Posted: Fri Dec 16, 2011 4:47 pm Post subject: |
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| Which ever one you get away with. |
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John Savage
Joined: 30 Jan 2002
Posts: 1252
Location: United Kingdom (Great Britain), not USA state,
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| Posted: Fri Dec 16, 2011 5:52 pm Post subject: |
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| Brian Lohman wrote: | | John Savage wrote: | | these examples were found very quickly using a ball bearing of the correct size dropped into the exhaust and rolled around the bend |
John, you mean using a ball bearing one size larger than legal? Which outlet diameter is legal in your eyes. The dime(middle), quarter(left) or half-dollar(right) sized one?
Are they really being manufactured with that much discrepancy or were they opened up, modified and re-powder coated? |
Ball bearings are used at legal size and if they don't fit through then you have an illegal pipe, those in the picture are illegal modified pipes.
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Anthony Burke
Joined: 19 Mar 2011
Posts: 22
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| Posted: Sun Dec 25, 2011 12:57 am Post subject: |
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Can someone please tell me what the legal size for the bearings is? I checked the documents and can't find any reference other than to say "must be un-modified".........
I would like to check the variations in a few mufflers, a baseline would be useful. |
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Clark hadden
Joined: 30 Jan 2006
Posts: 201
Location: Canada, Not usa, Nesleton
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| Posted: Mon Jan 02, 2012 3:25 pm Post subject: |
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I saw this at the Euro max race this past year in France, they cut the pipe, after they tried the ball, and they were Dq'd for the weekend!!!..
we need this checked in North America!!!.. |
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Joe Ricard
Joined: 23 Jun 2009
Posts: 868
Location: United States, Mississippi,
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| Posted: Thu Sep 27, 2012 9:39 am Post subject: |
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What size is the test ball.
Having bought a used motor from a guy in this thread I would like to check this.
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Arrow AX-8/ Rotax Sr. |
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Ken Schilling
Joined: 01 Dec 2005
Posts: 1340
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| Posted: Thu Sep 27, 2012 10:35 am Post subject: |
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Keep in mind a ball bearing won't be able to check for a pipe that is modified with an oval shape... 
Just sayin'...
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Ken Schilling
#21x / S4 / ProKart Challenge (PKC)
SKUSA Data Administrator
Good luck is where preparation and opportunity meet!!!
The opinions I express are mine alone and do not reflect those of any organization of which I am a member. |
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