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 Post subject: Auto Overdrive
PostPosted: Sun May 20, 2018 10:03 pm 
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Just been reading in Club Torque about the finishing of Charlie Deards' beautiful 2500S at the Practical Classics show.

The last paragraph says 'the overdrive on the BW65 auto box should be completed by Moordales in the next few months'.

As the owner of two 1850s and one Sprint auto I shall follow this with great interest.


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 Post subject: Re: Auto Overdrive
PostPosted: Tue May 22, 2018 5:54 pm 
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Making a standalone overdrive is quite easy if you have access to, and ability on, machine tools, and room in the tunnel to fit it.

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Currently over 35 years worth of fixing 35 boxes.
Hoping to reach 65 years worth of fixing 65 boxes.


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 Post subject: Re: Auto Overdrive
PostPosted: Tue May 22, 2018 7:11 pm 
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Overdrive Spares will happily supply you with a standalone unit and so with a little tunnel modification...
Image
http://www.odspares.com/phdi/p1.nsf/sup ... ent&part=4

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

Disposal fleet: Golf GTi 16v MK3 Anniversary

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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 Post subject: Re: Auto Overdrive
PostPosted: Tue May 22, 2018 7:18 pm 
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I have overdrive units amongst Jonners' things...


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 Post subject: Re: Auto Overdrive
PostPosted: Tue May 22, 2018 7:46 pm 
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I reckon you'd have to bolt that to the front of the diff to get it in a Dolomite! The sheer size of the BW65 and the "choke point" in the Dolly bodyshell just aft of the removable tunnel would preclude any possibilty of mounting it at the front end of the tunnel. The sensible thing would be to replace the prop centre bearing with it, but, even if you WERE prepared to hack the shell about to fit it there, its right where the seats go! And bolting it to the diff would do wonders for the unsprung weight - NOT!

My solution is better, if not much easier, i've got the Aisin Warner ECU controlled, 4 speed, 3 range, overdriven autobox with lockup on 4th gear that goes with my Omega 2.2 16v motor. It's been a tight squeeze getting it in and the wiring was a total PITA, but i've not had to mod the shell in any way, so no risk of BIVA for me!

I'm just praying it was worth the effort! The 1.8 tonne air conditioned, power steered, 3.7 diffed behemoth that donated it's power train to the project managed to average 38mpg on a 300 mile, mostly motorway run shortly before I dismantled it. In the 1100kg Sprint with no PAS or aircon to drag it down and a taller 3.45 axle, i'm hoping for VERY relaxed cruising and fuel economy in the 40+ range - at least on a run!

Steve

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2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.


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 Post subject: Re: Auto Overdrive
PostPosted: Tue May 22, 2018 9:27 pm 
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Well that escalated quickly into an entire engine and box transplant! :lol:

Replacing the centre bearing would be worth a look but agree that bolting it to the diff would be a courageous choice!

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

Disposal fleet: Golf GTi 16v MK3 Anniversary

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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 Post subject: Re: Auto Overdrive
PostPosted: Thu May 24, 2018 11:42 pm 
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Interesting - I was wondering about doing this with my Stag but was told that it isn't possible. Those who have (or have driven) an auto stag will know that they are a bit under geared and could well do with another cog when it comes to motor way driving etc. Would be great to hear more about this. Id be wrapped if an od can be applied to a stag auto box

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1971 Triumph Toledo
1975 Triumph Stag
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 Post subject: Re: Auto Overdrive
PostPosted: Fri May 25, 2018 5:50 am 
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Isn’t the auto’ ‘box shorter than the manual o/d ‘box? The prop is certainly longer, and by more than the width of the manual adapter plate which isn’t used...

The auto’ transmission tunnel is flatter than the manual, especially to the rear, so you’d need to adapt that, but surely it would fit? Isn’t there a rear extension housing on the back of an auto’ box too? I used to have one I. The garden that I could have experimented with, but I gave it away 🙁


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 Post subject: Re: Auto Overdrive
PostPosted: Fri May 25, 2018 8:21 am 
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Nice to dream about this but I think it's the most strange and stupid idea to put an od behind an autobox. The lining up, the short propshaft involved, the modification of the body and the overall characteristics of an autobox of a non solid drive according the converter. Find a fourspeed autobox if you want an extra gear.

Jeroen.

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 Post subject: Re: Auto Overdrive
PostPosted: Fri May 25, 2018 8:54 am 
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Toyota, and others, have autoboxes with overdrive...


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 Post subject: Re: Auto Overdrive
PostPosted: Fri May 25, 2018 9:25 am 
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Quote:
Toyota, and others, have autoboxes with overdrive...
I know the Nissan Prairie had an o/d on a autobox, damn thing was smooth in operation
at high speed as well.

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Construed as a public service, self preservation in reality.


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 Post subject: Re: Auto Overdrive
PostPosted: Fri May 25, 2018 9:27 am 
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Quote:
Isn’t the auto’ ‘box shorter than the manual o/d ‘box? The prop is certainly longer, and by more than the width of the manual adapter plate which isn’t used...

The auto’ transmission tunnel is flatter than the manual, especially to the rear, so you’d need to adapt that, but surely it would fit? Isn’t there a rear extension housing on the back of an auto’ box too? I used to have one I. The garden that I could have experimented with, but I gave it away 🙁
The 65 IS slighly shorter than a man/OD box, but only by an inch or two, but the loss is much greater than that as the BODY of the trans is much longer than the body of a non O/D manual and the tailshaft housing with speedo drive is correspondingly shorter, only about 6" long. Then there is the shorter mainshaft you'd have to make for the autobox and the adaptor housing too, I don't think it's a viable alternative.

Like Jeroen says, get a 4 speed box to start with......I did!

The Toyota/Mitsubishi Auto range nearly ALL have "O/D" but its not a true overdrive, just a 4th gear that can be locked out manually, its still operated by the same valve block as the rest of the transmission.

Steve

_________________
2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.


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