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Are these the Ebay rods that have been discussed?
http://www.ebay.com/itm/Connecting-Rods-for-Triumph-TR3-TR4-Forged-Conrods-Con-Rod-158-75mm-ARP-Bolts-/131562025540?hash=item1ea1b53244&vxp=mtr
Any thoughts? The price is certainly attractive...
Brad
On Tue, Jul 21, 2015 at 12:24 PM, MadMarx <tr4racing@googlemail.com> wrote:
> Hi Guys,
>
>
>
> After my engine blow at the last race and a rod in two pieces I
> investigated about rod design.
>
>
>
> In US forums I found an interesting opinion:
>
>
>
> H-beam rods are for low rev high torque engine (turbo, compressor)
>
> I-beam are for medium torque engines with high revs
>
>
>
> 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+.
>
>
>
> The manufacturer of the broken H-beam rod was Scat.
>
>
>
> I think next time I order an I-beam rod from Scat.
>
>
>
> What do you think?
>
>
>
> Cheers
>
> Chris
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
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> Unsubscribe/Manage:
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>
>
>
>
--
*Brad Eells*
*Friends of Triumph*
*http://www.fot-racing.com/ <http://www.fot-racing.com/>*
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<div dir=3D"ltr">Are these the Ebay rods that have been discussed?<div><br>=
</div><div><a href=3D"http://www.ebay.com/itm/Connecting-Rods-for-Triumph-T=
R3-TR4-Forged-Conrods-Con-Rod-158-75mm-ARP-Bolts-/131562025540?hash=3Ditem1=
ea1b53244&vxp=3Dmtr">http://www.ebay.com/itm/Connecting-Rods-for-Triump=
h-TR3-TR4-Forged-Conrods-Con-Rod-158-75mm-ARP-Bolts-/131562025540?hash=3Dit=
em1ea1b53244&vxp=3Dmtr</a><br></div><div><br></div><div>Any thoughts? T=
he price is certainly attractive...</div><div><br></div><div><br></div><div=
>Brad</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Tue, Jul 21, 2015 at 12:24 PM, MadMarx <span dir=3D"ltr"><<a href=3D"=
mailto:tr4racing@googlemail.com"; target=3D"_blank">tr4racing@googlemail.com=
</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang=3D"DE" l=
ink=3D"blue" vlink=3D"purple"><div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.0pt;font-family:"Verdana","sans-serif"=
;color:#1f497d">Hi Guys,<u></u><u></u></span></p><p class=3D"MsoNormal"><sp=
an style=3D"font-size:10.0pt;font-family:"Verdana","sans-ser=
if";color:#1f497d"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNorma=
l"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana=
","sans-serif";color:#1f497d">After my engine blow at the la=
st race and a rod in two pieces I investigated about rod design.<u></u><u><=
/u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-siz=
e:10.0pt;font-family:"Verdana","sans-serif";color:#1f49=
7d"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-=
US" style=3D"font-size:10.0pt;font-family:"Verdana","sans-se=
rif";color:#1f497d">In US forums I found an interesting opinion:<u></u=
><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"fon=
t-size:10.0pt;font-family:"Verdana","sans-serif";color:=
#1f497d"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana","=
sans-serif";color:#1f497d">H-beam rods are for low rev high torque eng=
ine (turbo, compressor)<u></u><u></u></span></p><p class=3D"MsoNormal"><spa=
n lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana",=
"sans-serif";color:#1f497d">I-beam are for medium torque engines =
with high revs<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D=
"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana","san=
s-serif";color:#1f497d"><u></u>=C2=A0<u></u></span></p><p class=3D"Mso=
Normal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Ve=
rdana","sans-serif";color:#1f497d">As engineer I agree with =
this statement. On high revs the rod shaft gets bended back and forth by th=
e inertia caused by the rotation.<u></u><u></u></span></p><p class=3D"MsoNo=
rmal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verd=
ana","sans-serif";color:#1f497d">I could imagine that the sh=
arp sides of the H-beam rod will create a crack after a while because the s=
tiffness for bending along the rotation axis smaller than with an I-beam ro=
d.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" styl=
e=3D"font-size:10.0pt;font-family:"Verdana","sans-serif"=
;;color:#1f497d">That means to me that the fatigue resistance is smaller on=
an H-beam rod at high revs.<u></u><u></u></span></p><p class=3D"MsoNormal"=
><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana&q=
uot;,"sans-serif";color:#1f497d">With high revs on a long stroke =
engine I mean 6000+.<u></u><u></u></span></p><p class=3D"MsoNormal"><span l=
ang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana",&qu=
ot;sans-serif";color:#1f497d"><u></u>=C2=A0<u></u></span></p><p class=
=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&=
quot;Verdana","sans-serif";color:#1f497d">The manufacturer o=
f the broken H-beam rod was Scat.<u></u><u></u></span></p><p class=3D"MsoNo=
rmal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verd=
ana","sans-serif";color:#1f497d"><u></u>=C2=A0<u></u></span>=
</p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;f=
ont-family:"Verdana","sans-serif";color:#1f497d">I thin=
k next time I order an I-beam rod from Scat.<u></u><u></u></span></p><p cla=
ss=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family=
:"Verdana","sans-serif";color:#1f497d"><u></u>=C2=A0<u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-si=
ze:10.0pt;font-family:"Verdana","sans-serif";color:#1f4=
97d">What do you think?<u></u><u></u></span></p><p class=3D"MsoNormal"><spa=
n lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Verdana",=
"sans-serif";color:#1f497d"><u></u>=C2=A0<u></u></span></p><p cla=
ss=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family=
:"Verdana","sans-serif";color:#1f497d">Cheers<u></u><u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-si=
ze:10.0pt;font-family:"Verdana","sans-serif";color:#1f4=
97d">Chris<u></u><u></u></span></p></div></div></div><br>__________________=
_____________________________<br>
<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=
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t/mailman/options/fot/tr4abrad@gmail.com</a><br>
<br>
<br>
<br></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div cla=
ss=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><b>Brad Eells</b>=
</div><div><b>Friends of Triumph</b></div><div><b><a href=3D"http://www.fot=
-racing.com/" target=3D"_blank">http://www.fot-racing.com/</a><br></b></div=
><div><b><br></b></div><div><img src=3D"https://docs.google.com/uc?id=3D0B9=
vVTDWaFCqFYVNfS2ZBaHdmXzg&export=3Ddownload" width=3D"96" height=3D"71"=
><br></div><div><br></div></div></div></div></div></div></div></div></div><=
/div></div>
</div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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