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Schnitzer 20-4 Reproduction


mattij

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9 hours ago, Conserv said:


Wait. What? ?

 

Came for the crime. Leaving disappointed... ?


Surely after forty years, the statute of limitations has run! And I promise I won’t tell a soul. ?

 

Regards,

 

Steve

 

Makes one wonder if shenanigans like what Smokey Yunick pulled of in stock car racing were  involved with two same numbered cars. Smokey would modify a car, acid dip it, put in thinner glass, change body angles, etc - and if the stewards called him on it, he'd invite him out to the parking lot, where he had another car modified just like it, that looked brand new that he'd offer to let them take reference measurements from! 

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Koboldtopf - '67 1600-2

Einhorn - '74 tii

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  • 1 year later...
On 12/10/2015 at 10:08 PM, mattij said:

Yet another example of 'minor details'. To make sure sure the casting will produce a quality head, we tried to design the mold & casting system carefully. How molten aluminium fills the mold, gases are extracted efficiently, cooling happens in controlled manner, etc. Found an engineer with good references, etc. and who was enthusiastic about the project and started the work. Everything looked promising.

 

Unfortunately in this case I learned that state of the art simulations are worth nothing without practical experience. In theory the system in picture should have worked, but the real life castings did not produce what I was expecting.

 

post-33891-0-47744200-1449779707_thumb.j

 

Only after spending significant time figuring out what was wrong, I decided to find a really experienced foundry master. After he saw the casting system design and the unsatisfactory result, it took about 10sec for him to figure out what should be changed. He also sketched new mold & casting system design in just a few days time.

 

On paper, by hand, a crystal clear 3D design. 

No wonder, as he had been doing that for almost 50 years...

 

(For now, about seats and guides material, http://www.sbintl.com/ http://www.johnson-metall.fi)

Hello,   can you explain what was the problem with this casting runner/gating setup ?  And  can you show what the engineer came up with for it to work ? 

 

Thank you 

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