Noz Posted April 17, 2012 Share Posted April 17, 2012 Hi all. Anyone know what material the mkiv supra piston is. I am looking for an actual material spec, rather than forged steel or whatever. Thanks Quote Link to comment Share on other sites More sharing options...
Dnk Posted April 17, 2012 Share Posted April 17, 2012 Caliper piston or engine piston ? Which ever you mean i doubt you'd get an exact material spec for either. Quote Link to comment Share on other sites More sharing options...
Thorin Posted April 17, 2012 Share Posted April 17, 2012 It's metal. Quote Link to comment Share on other sites More sharing options...
Noz Posted April 17, 2012 Author Share Posted April 17, 2012 just trying to find out what grade of material. engine piston. not looking for specific datasheet's just information regarding grade would be helpful. Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 17, 2012 Share Posted April 17, 2012 I doubt you will ever get it. Piston manufacturers have thier own material grades which they keep close to their chest. They don't put international standard grades on their drawings, just their own internal material codes, so even if you could get a copy of the original piston drawing you would be none the wiser unless you worked for the piston supplier. Quote Link to comment Share on other sites More sharing options...
Noz Posted April 17, 2012 Author Share Posted April 17, 2012 Well I'd like to plate a piston for a pen tidy at work. I am able to have access to equipment which will tell me the material composition and hardness test. I'll do a small report on its make up, and possibly do a couple and get an average and publish it when I find it for peoples information. I may compare the GE piston to the GTE piston and I will have both in the next few weeks. I think a small report on the actual components making up the materials would be interesting, definitely the hardness testing for rockwell as the debate for the properties of each piston states they are the same. Anyone wish to vote if they are actually the same material? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 18, 2012 Share Posted April 18, 2012 They are a hypereutectic silicon alloy casting. probably a similar material to that which most OE turbo piston makers cast from. Obviously the N/A piston has no oil squirter gallery in the crown, so has a vastly inferior heat rejection to the TT pistons. Whether the alloy composition is exactly the same, who knows? Probably not. Recommended piston to bore clearances for the N/A and the TT engines may give you a clue. Hardness testing won't necessarily tell you if the base alloy is different, it may just be the differing heat treatments they may or may not receive. Neither is suited to high boost applications. Quote Link to comment Share on other sites More sharing options...
Noz Posted April 18, 2012 Author Share Posted April 18, 2012 I wanted to hardness test them purely to compare, rather than to understand the materials make up. It was purely an idea to compare the two, as many sources explain the TT and NA pistons are the same, so an actual material break down I thought would be interesting. I will look into the different properites of hypereutectic silicon alloys and compare them when I do a quick report. Thanks Chris Quote Link to comment Share on other sites More sharing options...
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