Lotus Elan

Magnesium Parts

PostPost by: TWebb » Wed Nov 18, 2020 4:23 pm

I will be putting together a new drive train. Are there any issues to be concerned about relative to using magnesium and/or aluminum? (Bell housing, gear case, tail shaft, diff nose)

Also, Kelvedon offers a "quick release" bell housing. Anyone have any experience with this newer product.

This will be used in the racecar.

Thanks
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PostPost by: 661 » Wed Nov 18, 2020 5:35 pm

I have an Alan Henderson quick release bell housing. I find it a pain and would be happier pulling the engine.
Ian Ford has it too and told me he likes it alot.....
Magnesium is meant to have a shelf life, Ali less so. Mg is quite brittle.
I've got Mg where I can. You can't have a Mg bell housing with the quick relase system ( unless things have changed) and the nose is best in Ali ( I am told , as it seats the oil seal better).
So it costs a bit more, is a bit lighter. There are better ways to save weight ( the cage, strengthening the shell in the places you need only, seat, fire extinguiser, tank.)
Happy to chat
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PostPost by: Vali » Thu Nov 19, 2020 7:08 am

661 wrote:Magnesium is meant to have a shelf life, Ali less so. Mg is quite brittle.


What does that mean? Magnesium will last about let´s say 5 years then it has to be replaced because it´s get to brittle or what does you mean with shelf life?
Because the rear hub carrier and wheels often are in magnesium?
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PostPost by: BrianA » Thu Nov 19, 2020 8:46 am

TWebb wrote:This will be used in the racecar.

Thanks


A word of warning - if you want to run to FIA spec and obtain HTP papers for the car, you must retain the cast iron gear casing. Bell housing and tail shaft housing can be changed but the central gear casing cannot.

I am in the process of removing a magnesium cased gearbox from a recently acquired GTS spec car for this very reason. It also has a concentric clutch release set up that has to go, as this is illegal in the eyes of the FIA which requires most things to remain as per the original homologation (# 127 if I remember correctly).
1966 S3 Coupe - Pre airflow
1964 S2 GTS
1961 Elite race car
1955 Mk IX (ex Goodwood 9 hours)
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PostPost by: TWebb » Thu Nov 19, 2020 5:14 pm

Brian,

At this point I am not concerned about FIA cert. My car has no provenance. In the States the groups I run with allow for alloy gearbox and diff casings.
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PostPost by: 661 » Fri Nov 20, 2020 9:42 am

Vali wrote:
661 wrote:Magnesium is meant to have a shelf life, Ali less so. Mg is quite brittle.


What does that mean? Magnesium will last about let´s say 5 years then it has to be replaced because it´s get to brittle or what does you mean with shelf life?
Because the rear hub carrier and wheels often are in magnesium?

Forgive me, I am no metallurgist. When looking at Mg components and speaking to race teams I was led to believe that magnesium castings would not remain relaible for as long as aluminium ones. If I recall this was when I was discussing gearbox casings but I reencountered the same thing when looking at secondhand race wheels.
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PostPost by: bitsobrits » Fri Nov 20, 2020 6:40 pm

I believe the concern with magnesium is (internal) corrosion over time.
Steve

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Formerly:
Elan S1 1964
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PostPost by: Lyn7 » Fri Nov 20, 2020 7:40 pm

Hi Guy's. I can understand the concern about old mag wheels as they are pretty critical. Other mag castings may be less so. I have had no problem running old mag gearbox castings for 30 years! I have bellhousing, main case and tail housing marked 1963, 1964 and 1965 respectively. I inspect them periodically when the opportunity arises and have no concerns about their use.
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