[Fot] A-Type Overdrive Testing

[Jack Wheeler]

 I can attest to that.  Just under the bridge at Road Atlanta (Runoffs 1993) a Porsche 914 spun in front of me, then came whipping across the track backwards, right in front of me.  At least 5 cars involved, and they red flagged the race.  I went both feet in and the overdrive was about the only piece of my car that remained in tact after that!  There are some videos around.  Ouch!!

Jack

    On Tuesday, December 24, 2019, 7:00:26 PM EST, Greg Blake <gblake58tr3 at icloud.com> wrote:  
 
 Whenever you start to spin it’s two feet in. I’ve been in a few situations where other drivers have tried to save a spin by not following this advice and they always come rolling across the track backwards following an unpredictable path usually collecting a few unsuspecting racers along the way.  Always go two feet in. 

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On Dec 24, 2019, at 12:50 PM, David Gott <triumphsix at yahoo.com> 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


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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. 

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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)

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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 ChristmasQuick QuestionA 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 advanceGlenn
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