Engine case casting composition

radiatedmocha27

radiatedmocha27

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So I am thinking about modifying the casting on the engine case but it's going to require welding and I'm wondering what type of aluminum is used to cast these motorized bicycle engines I'm assuming it's going to be very low grade and highly porous naturally but knowing what type of composition it is or something close to would go a long ways to help figure out what type of rods I'm going to need to weld on to these cases
 
radiatedmocha27 said:
I'm wondering what type of aluminum is used to cast these motorized bicycle engines I'm assuming it's going to be very low grade and highly porous naturally
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We call it "Chinesium"...lol...lol.

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So best I found is this, apparently a383 can be MIG and TIG welded, but it's just a general search but it might help if you guys wanted to do some extreme case fed engines or rerouting intake ports to the sides or some wild overly complicated thing like that

-The type of aluminum commonly used for Chinese motorized bicycle engines is generally a high-pressure die-cast aluminum alloy, such as ADC12 (A383) or A356. These aluminum alloys provide a good balance of strength, ductility, and cost-effectiveness for the engine components.
 
The issue really isn't the grade of aluminum used, it's the casting methods and lack of quality control that lead to a lot of porosity and thin castings and the lack of heat treating that leaves them soft. Worn out casting molds and loosey goosey machining probably don't help.
 
While throwing the chips and sprues right back into the crucibles seems smart isn't that introducing inclusions and messing with the alloy? A pile of dirt and chips getting dumped in surely puts a lot of sillica into the mix. I suppose at the home at a small fab shop it is, but in a 30 sq mile plant it isnt
 
DAMIEN1307 said:
Wow, they're using something THAT high grade???...lol...lol.
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metal isnt graded like milk or meat, but rather is a description of the alloying elements. High value agricultural products like Tobacco and Tea are graded the same. 1010 steel is 99.9 percent iron by weight without any alloying elements. 4180, is iron with chromium, molybdenum and a .8% carbon by weight. The german metal grading has all manner of detailsin the numbers
 
cloakedvillain said:
metal isnt graded like milk or meat, but rather is a description of the alloying elements. High value agricultural products like Tobacco and Tea are graded the same. 1010 steel is 99.9 percent iron by weight without any alloying elements. 4180, is iron with chromium, molybdenum and a .8% carbon by weight. The german metal grading has all manner of detailsin the numbers
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I KNOW this...lol...This was just my feeble attempt at joking is all...lol.

I never realised that just joking around needed to be explained to make it clear that it is just a joke...lol...lol.

Especially since it is well known here in the forums and elsewhere that I am the class clown and court jester all rolled up into one...lol.
 
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