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My Project Engine(S) And Gearbox(Es)

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#1 MaximMini

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Posted 10 November 2019 - 12:00 PM

Hello Everyone,

 

Part of of my restomod project (link below) will obviously be the rebuild of my engine(s) and gearbox(es). Why plural when the restomod project is about my 91 Mini Cooper you may ask. Because inthe process I will build up a second unit for further use :shades:.

 

Both units will be of more or less the same specification which means 1293 ccm with MS Evo cam and HIF 44 carburettor. More details to come as soon as I have decided with hopefully the help of you guys.

 

Here are some photos of one of the short engines as provided by Faxe racing here in Germany

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And one of the gearboxes after dismantling

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And the first question, do you agree that the idler gear housing is reusable? I'm a bit concerned about the face of the input gear bearing.

 

This is the first set of spares which I received from John Guess

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The idea is to have a full set of spares available and then reorder what was actually used for the second build.

 

What is your opinion on the diff bearings? Reused good thrust bearings or change to new non-thrust?

 

Next are the cylinder heads which have been reworked using race spec valves of 35,6 and 30 mm diameter respectively.

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Is it worth the effort to opening up the outlets to meet the gasket opening?

 

I hope that this will become one of those threads that provide some useful information to everyone and not only to me and want to thank you guys for your input.

 

Cheers from the Pied Pipers Town

 

 



#2 MaximMini

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Posted 10 November 2019 - 12:04 PM

And one more curiosity to add to my findings during disassembly of the gearbox.

 

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I wonder how you can alter the number of teeth while driving :D  ..


Edited by MaximMini, 10 November 2019 - 12:13 PM.


#3 Moke Spider

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Posted 10 November 2019 - 04:28 PM

Hi and I hope you have fun with your builds :proud:

 

The Idler Thrust Face in the Transfer Housing does look worn, but also looking at the Gearbox side of this, there's misalignment between the Transfer Housing and the Gearbox Case, which I've found top be very common, in fact, I'm yet to find a set that is aligned.

 

In regards to the Diff Bearings, they are quite big for their duty and so they don't work too hard. Pretty much any of the types of Bearings available will be fine here. I seldom replace them.



#4 MaximMini

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Posted 19 November 2019 - 07:43 PM

Hi Everyone,

 

Having invested in some measuring equipment I was finally able to take some measurements on my cylinder heads and the push roads.

 

Firstly I have measured the depth of the valved in the head which I expected to be quite consistent considering that the heads have been done by Faxe Racing. And indeed, the measurements vary by only two tenth of a millimetre (0.008").

 

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Next the depth of the valve spring seats. This is lefty left-hander on a bad Monday again. The depth vary by one millimetre (0.04")!

 

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Hard to see in the pictures but the depth vary in between 11.4 (0,45") and 12.4 mm (0.49").

 

What is the general opinion on this matter? Obviously it would have been best to have the seats redone to a higher spec but what can been done now? My idea is to select the valve springs accordingly (softest spring on the highest seat). Any comments?

 

And last but not least the overall hight of the heads:

 

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Both heads measure 69.6 mm (2.74")

 

Using a dial indicator gauge, I measured the push road length compared to the shortest one. What I found was a maximum difference of 0.25 mm (0.01"). I have read some articles about the importance of the push road length but since these engines won't be top end race engines, I will most likely just take sets of four push roads which are within a tenth of a millimetre for each set of inlet and outlet valves respectively. Again any thoughts about this matter?

 

 

Cheers from the Pied Pipers Town



#5 MaximMini

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Posted 01 December 2019 - 07:04 PM

Hi Everyone,

 

On Friday 10 kgs (20 lbs) of shiny shininess arrived from the platers

 

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It's been the first time that I have given parts for re-plating and I have been really worried about the outcome. But then everything went really very well and I'm actually chuffed with the overall results. On e thing that I will do different next time is that I will check all those parts that will be on display more carefully and rectify any blemishes in the surfaces before sending the parts to the plater.

 

And finally I decided to reassemble the cylinder heads today. I have spend ages to measure the valve springs and the heads (depth of the valves and of the spring seats) before selecting the springs so that the spring pressure when assembled will be very close to the same across the inlet valve and outlet valves of each head. I don't have the equipment to accurately measure the assembled length and the spring rate at that length but am confident that I have measured the differences the best I can.

 

Here are some pictures

 

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And last but not least I measured the diff output shafts, diff cage bushes and crown wheel bushes to see if I have to get new bushes fitted.

 

The measurements read:

- diff output shafts: 26.13 .. 26.15 mm (1.029 .. 1.030")

- crown wheel bushes: 26.22 .. 26.24 mm (1.032 .. 1.033")

- diff cage bushes: 26.30 .. 26.32 mm (1.035 .. 1.036")

 

This means a maximum clearance of 0.19 mm (0.007") which looks ok for me. Which is a bit strange is the fact that, while the measurements on all crown wheel bushes are within a very small range as are the measurements of the diff cage bushes, they are actually different.

 

Have you come by this situation and what is your opinion on the clearances?

 

 

Cheers from the Pied Pipers Town



#6 Moke Spider

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Posted 01 December 2019 - 07:37 PM

I hope you don't mind, but I've moved your thread to the Projects section as this is a more appropriate area for it.



#7 MaximMini

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Posted 01 December 2019 - 07:41 PM

Thank you very much





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