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Join Date: Oct 1999
Location: Marietta, GA
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901 gear change
I am building a 901 gearbox with shorter gears for shorter tracks. So far I have confused myself on the use of the "N" gear. I want to use an "N" in the fourth gear slot. All the charts say it can be done, but does it become a "Z" gear when it is placed as a fourth gear? Seems it has to "flip" to fit.
Thanks, neilca |
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02-12-2009, 07:18 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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The factory never flipped- the thrust axis reverses because the gears aren't straight-cut, so when the gears are under load, there is an axial thrust on the shafts. You want the load going all the same way.
Everyone says "I flip gears and it works fine, never had any problems" but I wouldn't do it in my own box, race or street.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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02-12-2009, 07:56 AM
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The factory did flip these gears. The "M", "S", and "O" gears were used in both 3rd and 4th, depnding on the year. Check it out here
http://www.roadglue.com/wiki/index.php?title=901_transmission |
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02-12-2009, 09:22 AM
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__________________
'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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02-12-2009, 10:45 AM
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Thanks John,
That series adequately explained the side thrust issue. neilca |
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02-12-2009, 11:41 AM
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3 restos WIP = psycho
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This comes down to personal preference on how comfy you are with the side load isse. I have a flipped gear in 3rd, FWIW.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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02-12-2009, 11:50 AM
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Registered
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My original question was if you take an N gear and place it in the fourth gear slot does it now become a Z?
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02-12-2009, 11:55 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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yes.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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02-12-2009, 11:59 AM
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