Alta and MM porn?

for those with Series MM sidevalve cars produced between September 1948 and February 1953

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RobThomas
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Alta and MM porn?

Postby RobThomas » Fri Apr 07, 2017 10:32 am

altaporn2.jpg
altaporn2.jpg (219.63 KiB) Viewed 1900 times


Never thought I'd ever have 2 of these here! :D
Last edited by RobThomas on Sat Jun 10, 2017 3:54 pm, edited 1 time in total.

firedrake1942
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Re: Alta porn?

Postby firedrake1942 » Fri Apr 07, 2017 4:14 pm

Ah but can you get them both a dishwasher ???

RobThomas
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Re: Alta porn?

Postby RobThomas » Fri Apr 07, 2017 5:56 pm

I think that one is a bit tooooo dirty for the washer (yet)

Has anyone got any Alta spares? I need 2 valves for this one. :cry:

RobThomas
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Re: Alta porn?

Postby RobThomas » Sat Apr 08, 2017 4:35 pm

Looks like the plan to commission a set of new valves will have to go ahead. :cry:
I'd hate to go to all this work and have the valve crack apart. Oh poop!
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ianvalve2.jpg
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ianvalve3.jpg
ianvalve3.jpg (214.51 KiB) Viewed 1865 times

youngcamper
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Re: Alta porn?

Postby youngcamper » Sat Apr 08, 2017 5:05 pm

Looking good Rob! What's the story behind the other one?
Will
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________1967-Lily________________________1963-Phoebe_______________________1965-Dobby_________

RobThomas
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Re: Alta porn?

Postby RobThomas » Sat Apr 08, 2017 5:38 pm

The new one belongs to someone else who doesn't have the facilities to repair it himself. He has offered to let me use his head after it gets rebuilt if I supply the labour and he buys the parts. Best of all worlds!
Needs some extensive welding and skimming plus new valves and guides as a minimum.

RobThomas
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Re: Alta porn?

Postby RobThomas » Sun Apr 09, 2017 12:39 pm

Possibly gonna need a bit more work, this one. :cry:
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RobThomas
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Re: Alta porn?

Postby RobThomas » Sun Apr 09, 2017 12:40 pm

ianguide2.jpg
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youngcamper
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Re: Alta porn?

Postby youngcamper » Sun Apr 09, 2017 1:28 pm

RobThomas wrote:The new one belongs to someone else who doesn't have the facilities to repair it himself. He has offered to let me use his head after it gets rebuilt if I supply the labour and he buys the parts. Best of all worlds!
Needs some extensive welding and skimming plus new valves and guides as a minimum.



YIKES! Those guides and springs look rather shot. Let me know how you go about replacing them please...
Will
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________1967-Lily________________________1963-Phoebe_______________________1965-Dobby_________

RobThomas
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Re: Alta porn?

Postby RobThomas » Sun Apr 09, 2017 3:49 pm

2 of them are split, so, no chance of saving them. I'll have to make them if I can't find a suitable alternative. VW Passat is a possible.

Redmoggy
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Re: Alta porn?

Postby Redmoggy » Fri Apr 14, 2017 1:17 am

When you say you are having valves made, are you commissioning someone to make new to a pattern or using blanks? Only the second option would seem more economical.

Rod

RobThomas
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Re: Alta porn?

Postby RobThomas » Fri Apr 14, 2017 8:46 am

The company I have approached can make them in their machine simply by entering the dimensions and out pop a load of valves to the exact spec required. The guides are more of a problem. Getting those made will mean me having to find the correct spec of guide material (Grey Cast Iron variation???) and then machining them to the right dimensions. Making up a set of caps/keepers etc for the top of the springs requires me to machine up some parts from other cars, hopefully I can do it from A-series parts but the first couple of attempts didn't go so well due to difficulties in keeping the parts in position.

smithskids
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Re: Alta porn?

Postby smithskids » Fri Apr 14, 2017 11:02 pm

You could make the guides from bronze?

les
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Re: Alta porn?

Postby les » Fri Apr 14, 2017 11:22 pm

Yes bronze is a good option, I had a set from bmc special tuning fitted to a mini S, which are now in my pickup head. :D


BLOWNMM
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Re: Alta porn?

Postby BLOWNMM » Sat Apr 15, 2017 1:04 am

Aluminium bronze is the preferred material.
Bob
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RobThomas
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Re: Alta porn?

Postby RobThomas » Sat Apr 15, 2017 10:49 am

Thanks, guys.

Is there a specific bronze variant (out of the several-million options) to go for?

My preference was to go for the same material as the original to reduce any possibility of problems further down the road. I've had a suggestion of Meehanite.

amgrave
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Re: Alta porn?

Postby amgrave » Sat Apr 15, 2017 12:33 pm

Is the head Aluminium ?. If it is you may have to be careful of expansion rates. If two differing metals are used and the holding piece expands more than the insert it would have to be an interference fit for it not to work loose but with ally too much interference can split it (one of your pics looks like that has happened). Might be something to watch out for when choosing the material for the inserts.
Good luck.


les
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Re: Alta porn?

Postby les » Sat Apr 15, 2017 6:27 pm

Yes that's a consideration, the guides I fitted were in an iron head.


smithskids
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Re: Alta porn?

Postby smithskids » Sat Apr 15, 2017 9:51 pm

Meehanite would be good, very fine grain cast iron with the machining properties of steel.

RobThomas
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Re: Alta porn?

Postby RobThomas » Mon Apr 17, 2017 11:39 am

Meehanite it is, then. Short bar of it on order.

Ta!

Rob


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