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Hi Guys,
=20
After my engine blow at the last race and a rod in two pieces I =
investigated about rod design.
=20
In US forums I found an interesting opinion:
=20
H-beam rods are for low rev high torque engine (turbo, compressor)
I-beam are for medium torque engines with high revs
=20
As engineer I agree with this statement. On high revs the rod shaft gets =
bended back and forth by the inertia caused by the rotation.
I could imagine that the sharp sides of the H-beam rod will create a =
crack after a while because the stiffness for bending along the rotation =
axis smaller than with an I-beam rod.
That means to me that the fatigue resistance is smaller on an H-beam rod =
at high revs.
With high revs on a long stroke engine I mean 6000+.
=20
The manufacturer of the broken H-beam rod was Scat.
=20
I think next time I order an I-beam rod from Scat.
=20
What do you think?
=20
Cheers
Chris
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vlink=3Dpurple><div class=3DWordSection1><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Hi Guys,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>After my engine blow at the last race and a rod in two pieces I =
investigated about rod design.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>In US forums I found an interesting opinion:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>H-beam rods are for low rev high torque engine (turbo, =
compressor)<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>I-beam are for medium torque engines with high =
revs<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>As engineer I agree with this statement. On high revs the rod shaft =
gets bended back and forth by the inertia caused by the =
rotation.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>I could imagine that the sharp sides of the H-beam rod will create a =
crack after a while because the stiffness for bending along the rotation =
axis smaller than with an I-beam rod.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>That means to me that the fatigue resistance is smaller on an H-beam =
rod at high revs.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>With high revs on a long stroke engine I mean =
6000+.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>The manufacturer of the broken H-beam rod was =
Scat.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>I think next time I order an I-beam rod from =
Scat.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>What do you think?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Cheers<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Chris<o:p></o:p></span></p></div></div></body></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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