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SRDT

MB6 gearbox, the compact BE4/6

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SRDT
20 hours ago, Tom16v said:

Ahh. That’s the box I need I think. Do you happen to know of any way of working out the code stamped on these boxes?

thanks again. 

20dm2k

The "20" in front is useless as you can see it's a gearbox but they punch it anyway.

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Tom16v

That’s perfect thank you. I’ll keep my eye out for a box with that code. 

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Arthur
Posted (edited)

If they weren't priced like they were made from gold, I would like to get one and check possibilities. It makes me wonder though whether it would be possible to modify a BE to have 6 gears between 2 bearings instead of 3 like BE3/6. Still lot's of effort for minor benefits though, but that hasn't stopped me before. 

 

I wonder why they went for 3 bearings with the BE3/6. For ease of design or because of the constraints. Normally the gears furthest from the bearings in your "Christmas tree" gear set gets shunt first.  I've seen lot's of ma gearboxes smashed on turbo-ed 106. It's mostly the 3rd gear that dies first. Increasing the distance  between bearings would mean less torque to be able to handle. It looks to me that the syncro unit's used's in the MB6 is where they have managed to create a lot more space to get 6 gears in  a little more space then 4  gears with the BE. 

 

Edited by Arthur

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SRDT

The BE3/6 is derived from the Gr.A BE1/6, Peugeot Talbot Sport sold it as a kit to transform your existing 5 speed gearbox. It was the cheapest way to make a few 6 speed synchromesh for racing:

BE1-6.png

 

That being said other carmakers used this kind of design on production cars for years, notably VW, Honda and Fiat.

 

 

 

 

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Tom16v

Do you happen to know whether any of the BE gearboxes in the 307 or 406 had the 19/63 final drive?

I can only find 206 boxes with  the correct codes on the continent And delivery is about £200. A bit steep for a used part. 
I expect that just shipping the pinion and crown wheel would be a lot cheaper, but the euro breakers don’t want to pull the boxes apart to get these out. 
Thanks again for your help 

Tom. 

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Arthur
Posted (edited)

I have 20DM12 and 20DP10 here and both are 17 x 77. Both TU - be4r. Same box only under battery mount differs. I’m going to swap mine for a 3,8 FD soon at a chap who scraps loads of psa cars here in the Netherlands. I can ask him.  

Edited by Arthur

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SRDT

You can find a 19/63 on a 208 but it's not the same part number for the secondary shaft so you probably need to upgrade other parts to fit it.

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SRDT

I've found yet another 6 speed BE gearbox:

IBW8GOP.jpgDPn8azY.jpg

OjKrtY0.jpg

This one hail from Iran, long story short they are currently on their own and in need of a 6 speed gearbox that is both manual and automated.

The 5 speed BE is already locally produced but this new gearbox probably isn't a carbon copy of the MB6.

PSA reused the previous MCM tooling but the Iranians can't do that. Without direct support from PSA they can at best look at the finished product but needs to design something that can be produced there.

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