[Fot] A-Type Overdrive Testing

[Tony Drews]

I didn't spin but I did lock up one rear wheel with a Detroit Locker 
diff.  Large bang, it didn't like that.  Detroit Locker was OK, but the 
one way clutch / roller arrangement in the OD broke into multiple 
pieces.  What's funny is that it still worked perfectly.  I had some 
debris fall out later when I changed the tranny oil so I took the OD 
apart and the inner part of the one way roller assembly came out in 3 or 
4 pieces.

Cheers, Tony

On 12/24/2019 12:49 PM, David Gott via Fot wrote:
> Speaking of spinning the OD backwards, which it won’t do, what happens 
> if you spin the car while overdrive is engaged?   Probably my biggest 
> concern for running one of these in a race car...   I was thinking I’d 
> use it on track and maybe autocross, but I think that is ill advised 
> now that I bring up that question.   Has anyone ever spun and rolled 
> backwards, with OD engaged?
>
> Dave G
>
>
> Sent from Yahoo Mail for iPhone 
> <https://overview.mail.yahoo.com/?.src=iOS>
>
> On Tuesday, December 24, 2019, 12:47 PM, Greg Blake 
> <gblake58tr3 at icloud.com> wrote:
>
>     If this is for a race car, you might consider shiming the
>     accumulator spring to get closer to 500psi.
>
>     Sent from my iPhone
>
>>     On Dec 24, 2019, at 10:51 AM, David Gott via Fot
>>     <fot at autox.team.net> wrote:
>>
>>      I was able to test my overdrive by chucking a 1/2” electric
>>     drill on the input shaft and turning the whole transmission.
>>      (Make sure to spin the right direction!). Pretty sure I used 4th
>>     gear.   I was able to determine that my OD pressure is at 350
>>     psi, so I’ll have to shim the spring I guess.
>>
>>     Secondary question; the OD seemed to stick on me, but I did not
>>     have a load on the output flange, due to being on the bench; I’m
>>     assuming this might be an issue?  Or would a load coax the OD to
>>     releasing as appropriate?
>>
>>     Hopefully I don’t hijack your thread too much!
>>
>>     Thanks,
>>     Dave Gott
>>     62 TR4 (“A” type on the bench)
>>
>>     Sent from Yahoo Mail for iPhone
>>     <https://overview.mail.yahoo.com/?.src=iOS>
>>
>>     On Tuesday, December 24, 2019, 11:25 AM, Jack Wheeler via Fot
>>     <fot at autox.team.net> wrote:
>>
>>         I have tested overdrives like this for years.  My drive motor
>>         only spins in one direction, which makes sure the output
>>         shaft only spins in the same direction the shaft would be
>>         spinning when the car is driven in a forward speed.
>>         Therefore, I don't know what would happen if you spun it in
>>         the wrong direction.
>>
>>         Jack
>>
>>         On Monday, December 23, 2019, 10:05:53 PM EST, Glenn Franco
>>         via Fot <fot at autox.team.net> wrote:
>>
>>
>>         Merry Christmas
>>         Quick Question
>>         A friend of mine started testing his A-Type Overdrives by
>>         back spinning the output flange (to the prop shaft) with a
>>         pulley and electric motor.
>>         I've seen this done by spinning the transmission INPUT shaft
>>         with a pulley and electric motor but not from the rear.
>>         Any chance of damaging the overdrive since the overrunning
>>         clutch is only going to spin in the one direction, can it
>>         lock up the overdrive?
>>         Thanks in advance
>>         Glenn
>>
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