steel choice
steel choice
(OP)
I an designing a small high performance 2 stroke engine.
For reliability and longevity reasons i will be using a steel bearing housing in place of the cast alloy housing normally used, less thermal expansion and higher stiffness to ensure greater life of the bearings.
Full hard O1 steel can be used, but i would like to avoid the heat treatment and internal grinding needed.
So looking for something with a bit of strength and exellent machinability.
A couple of alloys i have looked at are P 20 (M200), M315 and
4140 Ultimate, Bohler uddeholm steel.
Any other suggestions? or real world machining experience?
First few manual machined, and then to CNC once design is completed.
For reliability and longevity reasons i will be using a steel bearing housing in place of the cast alloy housing normally used, less thermal expansion and higher stiffness to ensure greater life of the bearings.
Full hard O1 steel can be used, but i would like to avoid the heat treatment and internal grinding needed.
So looking for something with a bit of strength and exellent machinability.
A couple of alloys i have looked at are P 20 (M200), M315 and
4140 Ultimate, Bohler uddeholm steel.
Any other suggestions? or real world machining experience?
First few manual machined, and then to CNC once design is completed.
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!





RE: steel choice
Regards,
Cory
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RE: steel choice
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!
RE: steel choice
RE: steel choice
How many of these things do you anticipate manufacturing in a day/month/year? What would be the final dimensions of the housing?
RE: steel choice
RE: steel choice
The stiffness and thermal expansion will not be any different for various alloys or strengths.
As long as the temper temperature is above the max operating temperature all should be fine.
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RE: steel choice
At this stage required quantities is an unknown, minimum of 12, max......?
I can source 1030, 1040 and 1045 bright steels.
Any one of these must be much harder than Cast and heat treated 601 Al im sure.
I will be doing more reading on the modulus, very interesting!
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!
RE: steel choice
Sometimes bearing housings that hold the bearing cantilevered let the bearing tip under heavy loads, and most bearings don;t like that. Similarly, Typical 2-stroke Built-up (pressed together) cranks are not very stiff, and may respond to firing and inertia loads by flapping like a butterfly, putting the main journals 'way out of alignment. Any signs of fretting on the crankpin where it is pressed into the crank halves?
Any signs of detonation on the spark plug or piston? Ball and roller bearings can't take impact loads very well. I'm not sure if the wrist pin, con rod, or main bearings would be likely to object first.
RE: steel choice
I have one engine with a steel bearing housing where the bearing is over 3 years old, and still like new. Normally bearing are toast after 12 months.
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!
RE: steel choice
I gather there is no steel that woulod be better or worse than any other?
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!