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Discussion Starter · #41 ·
I have just tested two bell housings both are aluminium as per the method in this link, can anyone else replicate my test as a 'per review' so to speak
Just tried a little white vinegar on the bell housing that arrived today, and got no reaction. :unsure:
 

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Nice!
 

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Definitely the easier way to do that job!
 

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Discussion Starter · #47 ·
I think it's very likely both magnesium and aluminum versions have been used. Probably in later years a switch to aluminum was made, for cost reasons.
I got the cracked bellhousing back. I tried the vinegar test on it. I can confirm that it reacted, so it was definitely magnesium.

The used replacement that I got from the recycler in Virginia came from a 1987 Milano. So at some point they updated the part for magnesium to aluminum.
 

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I hope you don't throw it away. There are people who can weld it. Parts are getting rarer.
BTW: is the weight difference noticeable?
 

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Discussion Starter · #49 ·
BTW: is the weight difference noticeable?
You had to ask. It took me 20 minutes to get the press-fit starter bolt out just to do an apples-to-apples weight comparison (both of these had the motor mount in, and the magnesium one has a little bit of grinding where it was cracked).

The weight is definitely noticeable. 1.5kg difference!

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Racers take note: 3.3 lbs (I made conversion to US English) can be meaningful.
I wonder what year was the changeover to aluminum?
I also suspect the early cars had magnesium lower sumps.
 

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Discussion Starter · #51 ·
That, I can check too. Somebody from the forum wants the oil pan from the old engine. I'll test and confirm.
 

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Wow! That's excellent. Probably the best way to test, is to weigh them against each other, as its noticeably different.
 

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Only the early GTV6 came with the Mag alloy parts in my observation. I seem to recall an early GTV6 brochure that touted quite a lot of Mag parts.

For a street car, you will prefer the aluminum alloy versions...I converted a couple of 3.0 GTV6 to aluminum alloy versions.

For cracked/separated Mag alloy parts, there are certain adhesives/structural epoxy that can be used if you stop crack propagation.
 

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Only the early GTV6 came with the Mag alloy parts in my observation. I seem to recall an early GTV6 brochure that touted quite a lot of Mag parts.
Hmm, seems like some evil marketing strategy.
I vaguely recall Corvettes (C6?) having titanium exhaust, but they didn't for the entire production run.
 
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