Gear reversing? What gives? |
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Gear reversing? What gives? |
DORIGTT |
Jul 13 2006, 03:04 PM
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#1
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Newbie Group: Members Posts: 25 Joined: 28-June 06 From: Southeastern, MI Member No.: 6,322 |
Who can 'splain dis to me?
I've read about some gears for sale which are reversed 4th and 5th gears. How does this work? Aren't the gears the same forward and reverse? How does it get assembled and work? Thanks folks |
Aaron Cox |
Jul 13 2006, 03:12 PM
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#2
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
lets say you have ratio X:Y
and you flip them on to the other shaft now you have Y:X (12:34 is NOT the same as 34:12) you can flip 3rds to 5ths... and 5ths to thirds.... or, 904 second gears to 4ths' and 4ths to 904 mainshaft seconds.... a 911/901 5 speed has 2nd gear attached to the mainshaft, ala, it doesnt come off.. a 904 mainshafts is splined all the way thru.... ala removable 2nd gears |
SirAndy |
Jul 13 2006, 03:14 PM
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#3
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Who can 'splain dis to me? I've read about some gears for sale which are reversed 4th and 5th gears. How does this work? Aren't the gears the same forward and reverse? How does it get assembled and work? Thanks folks for each "gear", let's say 5th, you actually have 2 gears, one on each shaft that are together. they have different tooth-counts. the two together give you your gear-ratio for that specific "gear". however, you can change gear-ration by using gears from other "gears" and by flipping them around, effectively changing your gear-ratio ... makes sense? (IMG:style_emoticons/default/smile.gif) Andy |
lapuwali |
Jul 13 2006, 03:21 PM
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#4
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
You take the gear pair and reverse which shaft they're on. So, you could, for example, take a G gearset (18:33), and flip it around to make a 33:18, which is taller than the tallest off the shelf gearset (ZD, 31:22).
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DORIGTT |
Jul 13 2006, 03:35 PM
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#5
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Newbie Group: Members Posts: 25 Joined: 28-June 06 From: Southeastern, MI Member No.: 6,322 |
I see!
That's pretty cool! I'm going to see what ratios I come up with in my 914/11 trans. While we're at it, what tranny's did the M and X etc gearsets come from? |
Aaron Cox |
Jul 13 2006, 03:43 PM
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#6
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
M and X....
i know X came in a few 912's... maybe M also... they are kinda short. |
lapuwali |
Jul 13 2006, 03:54 PM
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#7
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
M is a flipped ZA. X is an overdrive gear (like usually a 5th). It's fractionally taller than the V used as 4th in the 914 gearbox.
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TimT |
Jul 13 2006, 04:02 PM
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#8
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
While were talking gears, which gearset came with a '75 914?
I need to build a long track box for my car (my 911) the box I built is kinda short AFKQV, I want to build a AFMSX box that I can swap for longer tracks. I have 2 914 side shifters sitting on a shelf, and a pair of 901 boxes and a few boxes full of gears that I can go through to get the parts I need After I build a new box for myself, I will be having an "inventory reduction sale" on my spare gearsets... (IMG:style_emoticons/default/av-943.gif) |
Aaron Cox |
Jul 13 2006, 04:03 PM
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#9
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
While were talking gears, which gearset came with a '75 914? I need to build a long track box for my car (my 911) the box I built is kinda short AFKQV, I want to build a AFMSX box that I can swap for longer tracks. I have 2 914 side shifters sitting on a shelf, and a pair of 901 boxes and a few boxes full of gears that I can go through to get the parts I need After I build a new box for myself, I will be having an "inventory reduction sale" on my spare gearsets... (IMG:style_emoticons/default/av-943.gif) all 4 cyl 914's were A F N V ZD iirc al sixes were A GA N V ZA? i think |
Bleyseng |
Jul 13 2006, 04:41 PM
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#10
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
M and S gears were in 912 5 speed boxes and make for a nice close ratio box for street or AX ing. I kept the ZD for the freeway.
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Dave_Darling |
Jul 13 2006, 04:54 PM
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#11
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
The Four and Six had identical 1st and 4th gears; the rest were different. 2nd and 3rd were taller in the Six box, 5th was shorter.
http://members.rennlist.com/chuxter/901&915ratios.htm --DD |
marks914 |
Jul 13 2006, 07:50 PM
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#12
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Senior Member Group: Members Posts: 845 Joined: 9-October 04 From: the motor city Member No.: 2,912 Region Association: None |
I run:
F Flip V Flip N Flip H Its a nice tall set. Mark There is a chart I did a while ago somewhere on the board. |
jimkelly |
Jul 13 2006, 08:04 PM
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#13
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
chart on aaron cox blog : )
http://www.914world.com/bbs2/index.php?auto...ach&id=3082 gear ratio gear set gear ratios gearsets tranny gears |
Bleyseng |
Jul 13 2006, 09:34 PM
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#14
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
old pic of flipping 3rd and 5th
Attached image(s) |
Aaron Cox |
Jul 13 2006, 10:32 PM
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#15
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
i forgot about that LOL |
Trekkor |
Jul 13 2006, 11:05 PM
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#16
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
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