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To add:
The reason for the deformation of the crank is cause by the ignition =
forces.
The rod is hammering on one place of the bearing journal and like a =
Schnitzel it expands at that place from hammering on which bends the =
crank.
Simple as that :)
=20
Cheers
Chris
=20
=20
Von: Fot <fot-bounces@autox.team.net> Im Auftrag von Phil Gott via Fot
Gesendet: Sonntag, 24. November 2019 22:03
An: Friends Of Triumph <fot@autox.team.net>
Betreff: Re: [Fot] Center main support
=20
Interesting, Chris:
My machine shop said that .002=E2=80=9D run out at the center main, with =
the crank supported and spun on numbers 1 and 3 was a sign that it was =
developing high levels of internal stress (work hardening) and that it =
should be retired. They aim for 0 run out under these conditions. Based =
on what you=E2=80=99ve said, I wonder if they are being overly cautious. =
As they do not grind cranks themselves ( only polishing and balancing), =
they had little to gain from that diagnosis.
Thanks for the input.
Sent from my iPhone
On Nov 24, 2019, at 9:26 AM, Tony Drews <tony@tonydrews.com =
=EF=BB=BF=20
Wow! It's very nicely done. Certainly overkill.
Regards, Tony
On 11/23/2019 9:11 PM, Phil Gott wrote:
Here are some photos:=20
<image0.jpeg>
=20
<image1.jpeg>
=20
=20
<image2.jpeg>
=20
=20
Sent from my iPhone
<tony@tonydrews.com> wrote:
=EF=BB=BF=20
I agree, that sounds like overkill. Mine only requires the top of the =
cap to be machined flat, no other block mods.
Regards, Tony
On 11/23/2019 5:42 AM, Phil Gott wrote:
Thanks again, Tony:=20
The one we have, built by the late Bill Throop, in addition to =
reinforcing the cap itself, has the block machined internally to accept =
the sides of a strap, then the strap is cross bolted from the sides, =
through the block from outside. I=E2=80=99m wondering if this is a bit =
of overkill. Based on your recommendation, it seems to be.
Maybe I can send some pictures later today, as we are pulling the engine =
today for other work.
Phil
Sent from my iPhone
<tony@tonydrews.com> wrote:
=EF=BB=BF=20
I run that setup, it was an uncle jack trick. Here's what he wrote =
about that (on my engine building tips page):
"I also like to strap the center main to add rigidity to the bottom end. =
To do this, mill off the cast face of the main flush with the surfaces =
for the head bolts. Get a front strap for a Chevy 400 block. You must =
enlarge the holes in the strap and you must use longer bolts. Some =
builders feel that this is totally unnecessary, but since starting to do =
this, I have never had a main bearing deteriorate faster than a rod =
bearing, which is something that happens more frequently than you would =
expect."
Regards, Tony Drews
=20
On 11/22/2019 3:58 PM, Phil Gott via Fot wrote:
Has anyone seen the need to add extra support to the center main on the =
TR wet sleeve engine? We have an engine that has a steel bridge =
cross-bolted underneath and supporting the center main cap. Is this =
needed? Just took 3 factory cranks to the machine shop and all three =
were bent about .002 in (.002 run out at center main when supported on =
first and last mains.) Two of these were raced, the third was removed =
from a tired street engine. note: None of these cranks came out of the =
engine with extra support at the center.
Curious as to the need for the extra support.
Thanks,
Phil Gott
114 TR4A
=20
Sent from my iPhone
_______________________________________________
=20
http://www.fot-racing.com
=20
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/tony@tonydrews.com
=20
=20
=20
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>To =
add:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>The reason for the deformation of =
the crank is cause by the ignition forces.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>The rod is hammering on one place =
of the bearing journal and like a Schnitzel it expands at that place =
from hammering on which bends the crank.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Simple as that </span><span =
lang=3DEN-US =
style=3D'font-family:Wingdings;mso-fareast-language:EN-US'>J</span><span =
lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Cheers<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Chris<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b>Von:</b> Fot =
<fot-bounces@autox.team.net> <b>Im Auftrag von </b>Phil Gott via =
Fot<br><b>Gesendet:</b> Sonntag, 24. November 2019 22:03<br><b>An:</b> =
Friends Of Triumph <fot@autox.team.net><br><b>Betreff:</b> Re: =
[Fot] Center main support<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Interesting, =
Chris:<o:p></o:p></p><div><p class=3DMsoNormal>My machine shop said that =
.002=E2=80=9D run out at the center main, with the crank supported and =
spun on numbers 1 and 3 was a sign that it was developing high levels of =
internal stress (work hardening) and that it should be retired. They aim =
for 0 run out under these conditions. Based on what you=E2=80=99ve said, =
I wonder if they are being overly cautious. As they do not grind cranks =
themselves ( only polishing and balancing), they had little to gain from =
that diagnosis.<br>Thanks for the input.<o:p></o:p></p><div><p =
class=3DMsoNormal>Sent from my iPhone<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Nov 24, 2019, at 9:26 AM, Tony Drews =
<<a href=3D"mailto:tony@tonydrews.com";>tony@tonydrews.com</a>> =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>=EF=BB=BF <o:p></o:p></p><p>Wow! It's very =
nicely done. Certainly overkill.<o:p></o:p></p><p>Regards, =
Tony<o:p></o:p></p><div><p class=3DMsoNormal>On 11/23/2019 9:11 PM, Phil =
Gott wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal>Here =
are some photos: <o:p></o:p></p><div><div><p =
class=3DMsoNormal><image0.jpeg><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p =
class=3DMsoNormal><image1.jpeg><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p =
class=3DMsoNormal> <o:p></o:p></p><div><p =
class=3DMsoNormal><image2.jpeg><o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Sent from my iPhone<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Nov 23, 2019, at 12:23 PM, Tony Drews =
<a href=3D"mailto:tony@tonydrews.com";><tony@tonydrews.com></a> =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>=EF=BB=BF <o:p></o:p></p><p>I agree, that sounds like =
overkill. Mine only requires the top of the cap to be machined =
flat, no other block mods.<o:p></o:p></p><p>Regards, =
Tony<o:p></o:p></p><div><p class=3DMsoNormal>On 11/23/2019 5:42 AM, Phil =
Gott wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal>Thanks again, Tony: <o:p></o:p></p><div><p =
class=3DMsoNormal>The one we have, built by the late Bill Throop, =
in addition to reinforcing the cap itself, has the block machined =
internally to accept the sides of a strap, then the strap is cross =
bolted from the sides, through the block from outside. I=E2=80=99m =
wondering if this is a bit of overkill. Based on your recommendation, it =
seems to be.<o:p></o:p></p></div><div><p class=3DMsoNormal>Maybe I can =
send some pictures later today, as we are pulling the engine today for =
other work.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>Phil<o:p></o:p></p><div><p =
class=3DMsoNormal>Sent from my iPhone<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Nov 22, 2019, at 10:56 PM, Tony Drews =
<a href=3D"mailto:tony@tonydrews.com";><tony@tonydrews.com></a> =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>=EF=BB=BF <o:p></o:p></p><p>I run that setup, it was =
an uncle jack trick. Here's what he wrote about that (on my engine =
building tips page):<o:p></o:p></p><p><span =
style=3D'font-size:13.5pt;font-family:"Tahoma",sans-serif;color:black;bac=
kground:white'>"I also like to strap the center main to add =
rigidity to the bottom end. To do this, mill off the cast face of =
the main flush with the surfaces for the head bolts. Get a front strap =
for a Chevy 400 block. You must enlarge the holes in the strap and =
you must use longer bolts. Some builders feel that this is =
totally unnecessary, but since starting to do this, I have never had a =
main bearing deteriorate faster than a rod bearing, which is something =
that happens more frequently than you would =
expect."</span><o:p></o:p></p><div><p class=3DMsoNormal>Regards, =
Tony Drews<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>On 11/22/2019 3:58 PM, Phil Gott via Fot =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><pre>Has anyone seen the =
need to add extra support to the center main on the TR wet sleeve =
engine? We have an engine that has a steel bridge cross-bolted =
underneath and supporting the center main cap. Is this needed? Just took =
3 factory cranks to the machine shop and all three were bent about .002 =
in (.002 run out at center main when supported on first and last mains.) =
Two of these were raced, the third was removed from a tired street =
engine. note: None of these cranks came out of the engine with extra =
support at the center.<o:p></o:p></pre><pre>Curious as to the need for =
the extra =
support.<o:p></o:p></pre><pre>Thanks,<o:p></o:p></pre><pre>Phil =
Gott<o:p></o:p></pre><pre>114 =
TR4A<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Sent from my =
iPhone<o:p></o:p></pre><pre>_____________________________________________=
__<o:p></o:p></pre><pre><a =
href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a><o:p></o:p></pre=
><pre><o:p> </o:p></pre><pre><a =
href=3D"http://www.fot-racing.com";>http://www.fot-racing.com</a><o:p></o:=
p></pre><pre><o:p> </o:p></pre><pre>Donate: <a =
href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.html<=
/a><o:p></o:p></pre><pre>Archive: <a =
href=3D"http://autox.team.net/archive";>http://autox.team.net/archive</a> =
<a =
href=3D"http://www.team.net/pipermail/fot";>http://www.team.net/pipermail/=
fot</a><o:p></o:p></pre><pre>Unsubscribe/Manage: <a =
href=3D"http://autox.team.net/mailman/options/fot/tony@tonydrews.com";>htt=
p://autox.team.net/mailman/options/fot/tony@tonydrews.com</a><o:p></o:p><=
/pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p>&n=
bsp;</o:p></pre></blockquote></div></blockquote></div></blockquote></div>=
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