1931 Auburn 898A vintage rally preparation

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04 Mar 2018 20:43 #34260 by WinAuBurn
WinAuBurn replied the topic: 1931 Auburn 898A vintage rally preparation
Interesting Brad. Yes, a static display has it's advantages. After reading through the AACA link I'm tempted to consider the bolt on overdrive solution. There seems to be enough room to install something between the X-Frame and rear axle, possibly the Gear Vendors unit that can operate on 6V www.gearvendors.com/restorationclassic.html or maybe a Borg Warner. Here's a picture under the actual car - I know, must get those cobwebs cleaned up.
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04 Mar 2018 22:36 #34262 by Curt Schulze
Curt Schulze replied the topic: 1931 Auburn 898A vintage rally preparation
The differential housing on your 31 is not physically large enough to fit a high speed ring and pinion. This option was explored at Auburn Gear . A 32 or 33 dual ratio is the way to go. There are plenty of 34-36 diffs around. There is a early and late style of those as well. The late style is after 2-35. Always open them up and see not if they are broken but how bad are they broken.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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04 Mar 2018 23:44 #34263 by Brad Hoskins
Brad Hoskins replied the topic: 1931 Auburn 898A vintage rally preparation
Curt
I was thinking of high speed sets for the three factory ratios that were available: in 31
49:11 = 4.45:1 Speed at @2300RPM = 46MPH
52:11 = 4.72:1
51:10 = 5.10:1 Speed at @2300RPM = 40 MPH
In 32 , they added another gear set which presumably would work in the 31 carrier as well (but the case numbers are different , so who knows!)
49:12 = 4.08:1 Speed @2300 RPM = 50 MPH

The 1932 two speed axles were 4.54: 1 low and 3:1 high according to the factory brochure
Speeds are my rough calculation based on 30' tires, as you can see, it is hardly worth it to invest in the gear set

Do you know anyone who did the Ford conversion and was happy with it? A 3.73 ratio would get you about 55MPH.

Gear Vendor overdrives look start at around $3000 and have 1:778 final ratio which isn't quite as good as the 2 speed if my math is right!!

That's all. I really should go work on my partially assembled static display!

31 8-98 cabriolet

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05 Mar 2018 00:03 #34264 by RandyEma
RandyEma replied the topic: 1931 Auburn 898A vintage rally preparation
Hello. 1932- 33 two speed axles are very hard to find 1934-35-36 8cyl axles are not but they are quite a bit different 35-36 are hydraulic brakes 32-33 are mechanical and a lot of other things . Maybe brad can compute the rpms of a 4-1 ring and pinion set as ACD co still has a few of these left . R

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05 Mar 2018 14:41 #34266 by WinAuBurn
WinAuBurn replied the topic: 1931 Auburn 898A vintage rally preparation
So much great information. I think we would like to stay with the '31-'33 era and not change the brakes out, research tells me the steeldraulic brakes are well up to the task as long as they are serviced and setup correctly. We are still waiting on the car to verify the ratios installed but if I assume for the moment most folk go for the middle ground 52:11 (or higher speed) saving the low ratio choice if they live in the Rockies perhaps, then I'm at 59mph with the Gear Vendor solution which should work well. Of course the '32-'33 2 speed would be great if we could find one along with the controls. What has been your experience with the steeldraulic brakes?

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06 Mar 2018 05:34 #34268 by mikespeed35
mikespeed35 replied the topic: 1931 Auburn 898A vintage rally preparation
If you think you might want to use a Gear Venders call me. I just put a big explanation about it and the damned session timed out on me and I'm NOT going to write it again.
CORDiallyMIke

Mike Huffman

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