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So, my buddy just bought a lightly used Toro lawn mower with a plastic carburetor (there are brass inserts for the important parts) and we were discussing the benefits/detriments of plastic engine parts when I realized something possibly worth sharing:

I had to rebuild an aluminum carburetor on a rototiller because of the white aluminum oxide in the bowl and throughout which I assume resulted from the current hydrophilic ethanol in modern gasoline and it has been a nightmare getting the port inlet and linkage to hook up on the $11 replacement Chinese aluminum carburetor I bought.

So, are the Toro plastic carburetors actually an UPGRADE because you don't get aluminum oxide when you don't have an aluminum carburetor?
 

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Probably, but my guess is that it is mostly a way to cut down on expenses (JMHO)

On another take, I was working on a 08 Mini Cooper S and was surprised to find out that the drive by wire throttle body was made out of plastic......!
 

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Generally yes, but what was the expense of engineering, mold creation, changing the production line, etc. just to create a new plastic carburetor when they could have easily repurposed an existing proven aluminum carburetor product?
 

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Don't know the answer, but generally speaking specially in the automotive industry a lot of components have taken the direction of using plastic instead of aluminum and my understanding is that the main reason is to cut down expenses (JMMHO).
 

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Tecumseh has a "vector carb" plastic bowl, alloy top half, I have one on a crappy Coleman generator.


Sent from my iPad using Tapatalk
 

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I don't work with carbs in my job but we recently started using molded plastic in place of SS, Yes the molds cost around $200K upfront BUT in the production line there much cheaper, Less production time and any machining needed to do on the molded parts the tooling lasts much much longer which is also a savings, So using molded plastic it does save a lot more money and the original investments also can be considered a write off. Many other materials can be used to deal with the new gas but it's not worth the costs.
 

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Generally yes, but what was the expense of engineering, mold creation, changing the production line, etc. just to create a new plastic carburetor when they could have easily repurposed an existing proven aluminum carburetor product?
Volume manufacturing can justify some major expenditures. It wasn't done "just because". Trust me, the accountants had their say.
 
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