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Materials in the turbos in the 335
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03-26-2008, 08:10 PM | #24 |
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03-26-2008, 08:55 PM | #26 | |
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sorry that was just funny to me......I appreciate LACA335i's input as much as anyones
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03-26-2008, 09:53 PM | #27 |
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You will find most of these steel materials under SuperAlloy to be technical about it. They typically have properties of Modulus of Elasticity vs Temperature. In short, it means how rubbery does the material is when it gets hot. They are all very good and some are a lot better.
I don't think Aluminum is going to cut since it has a melting point (liquid) at 1075 F. Titanium is typical not particle since casting it is extremely expensive. It has to be done in a vacuum. Cost way more to process than it is worth out of the ground. Orb |
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03-27-2008, 05:33 AM | #28 |
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The turbine housing is NiSiCr (Ni-resist) cast alloy (e.g. D5S - 36%Ni;5%Si;2%Cr, D2B in diesels). It can be also made of Si-Mo ductile iron coated with a heat resistant cover layer of self-diffused alloy comprising Ni--Cr alloy including C, B and Si.
Turbine rotors are Ni-based steel (Silicon Nitride - Si3N4, Inconel) or TiAl (titanium aliminide) alloy (MHI) or ceramic. Compressor wheels can be made of high-strength aluminum or titanium, also TiAl and ceramic. The compressor housing is Aluminum alloy casting. The shaft is stainless steel, can't be aluminium because of the heat on the turbine side.
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Last edited by judec; 03-27-2008 at 12:05 PM.. |
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03-27-2008, 09:08 AM | #29 | |||
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03-27-2008, 11:29 AM | #30 | |
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Nothing else can take that kind of temp, Alum would melt. Alloys of steel would creep. Ti is no good, good for corrosion and weight but but too high coeff. of expansivity. The Blackbird Spyplane was all Ti, the fuel pissed out of the plane when they filled it on the ground. The plane swelled at higher speeds due to skin friction and then it was good to carry more fuel. |
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03-27-2008, 02:50 PM | #33 |
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What kind of turbos are these?
Mitsu? IHI? or some other like borgwarner?
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03-27-2008, 06:07 PM | #34 |
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threr are Mitsu torbos in N54. I've seen an announcement that in the X6 biturbo BMW will use Honeywell turbos.
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