Syamsul  Hadi, Anggit.  Murdani, Wirawan  , Haris  Puspito Buwono, Imam  Muda Nauri, 
    Recycled Aluminium from Motorcycle Pistons with Home Industry Casting Process,
    Journal of Engineering and Applied Sciences,
    Volume 15,Issue 12,
    2020,
    Pages 2630-2636,
    ISSN 1816-949x,
    jeasci.2020.2630.2636,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2020.2630.2636)
    Abstract: Changes in tensile strength of recycled
aluminium from the piston as a problem encountered. The
objective of this research is to know the tensile strength of
recycled aluminium from piston for the next use. The
methods used are: design and manufacture of tensile
specimen mold, specimen casting, tensile testing, material
composition testing and data analysis. The test results
showed that the tensile strength of the motorcycle piston
aluminium worth 376 MPa was decreased to 191 MPa for
the 1<sup>st</sup> recycled (49%) from the 1<sup>st</sup> recycled to the 2nd
recycled value of 118 MPa (38.3%) and from 2<sup>nd</sup> recycled
to 3<sup>rd</sup> recycled worth 117 MPa (0.8%) caused by loss of
elements during recycling include Cu, Si and Fe. The
shrinkage tolerance in a successful foundry into a tensile
test specimen is smaller than 6%. The SEM photographs
show that the porosity of the 3<sup>rd</sup> recycled aluminium is
less than in the 2<sup>nd</sup> and 1<sup>st</sup> recycled which means the
solubility of the alloying element is preferable, wherein
the insoluble elements (Cu, Si and Fe) are decreased.
    Keywords: Tensile specimen;tensile strength;recycled aluminium;motorcycle piston aluminium;shrinkage tolerance