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Is there a metallurgy test that can determine if Alloy crank cases are from the 1940s or relatively new castings. These Wood patterns were on ebay about 3 months ago.
There is fake patina out there so Im wondering. metal quality 80 years ago was porous.
hope pic works ...
View attachment 305390
I know some 50's thro' 70's Alu / magnesium crankcases (especially 2 strokes) were painted with oil based goldsize, I was told??? due to porosity issues.
Not my patterns, they were made in the early 1990s,they went for $5k.
In the Crocker Register there are some bikes that have a percentage of genuine parts, some genuine and some that can only be repop frame ,forks, motor and box.
But when it comes to stamping an Engine with a 1940s stamp, that is DMV stuff. there is also a token DMV stamped Engine, but then that one also changed from a 1938 to a 1942 model since the 70s.
The problem with Harry Sucher's book is that he got everything wrong and since 1977 everyone has quoted him , mistakes and all. He even got the wrong man , Albert G Crocker 1882, who the hells he ? not a mc manufacturer.
Paul Bigsby was quoted as saying 64 bikes were built, today there is more than was built, what kind of magic is that?
It would be possible to use old Indian + HD cases and tranny cases for the melting pot
Ball peen hammer! does'nt get more British than that
Aluminum casting alloys have a healthy dose of Silicon. It's what makes them casting alloys. The silicon is certainly not coming from 6061 where it is .4 to .8%. It is added and most aluminum die casting alloys have around 10% with some as high as 18. The silicon is what makes the metal flow and fill the mold. It also affects hardness of the casting.
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