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If the block is cracking from head stud to water jacket, it is normally =
caused by tightening the head studs in the block.
To avoid cracks, run the studs in by hand, without any tool. That is =
enough.
Tighten them will split the block.
=20
The torque of the head nuts are at the limit of what the block can take, =
that=E2=80=99s why the split in the thread hole zone when the studs are =
wrenched in.
=20
Cheers
Chris
=20
=20
Von: Fot <fot-bounces@autox.team.net> Im Auftrag von fubog1 via Fot
Gesendet: Dienstag, 14. Januar 2020 22:00
An: fot@autox.team.net
Betreff: Re: [Fot] Main brg strap
=20
That crack is pretty common with these, a Timesert or similar is the =
correct repair.
Re the center main cap strap, in my experience, these are engines are =
good up to 6.5kish, if it has a good crank & all is within spec and well =
balanced, and the loads are within reasonable limits.
Beyond that the bending loads increase with RPM, due to the recip weight =
heavily loading that center main, and it gets overloaded.
Once the cap deforms and/or fastener stretches, ie it's not round =
anymore and not supporting the bearings, the bad stuff starts to happen.
You can tell if it getting overloaded, measure the center journal very =
carefully, we're into tenths now, and note where the wear is, it's =
normally even all around the journal.
When the load gets too heavy the wear will be mostly on the crankpin =
side of the journal; it will be very obvious.
At that point a center strap will help for sure but the loads will still =
be there unless weight is reduced.
This is why I try to focus on torque vs high RPM HP with these engines.
=20
Glen
=20
=20
On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <fot@autox.team.net =
Well it=E2=80=99s finally time to build a new motor... the crack at the =
rear head bolt just won=E2=80=99t stop leakin anymore...so...
I=E2=80=99ve found the Chevy front strap to use on the center main, but =
what are you using for main bolts/studs for the additional length?
How about a complete set of fasteners for the mains? Does ARP make =
anything?
Motoring on in NORCAL
Nick
Sent from the wilds of NorCal=20
_______________________________________________
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot =
<http://www.team.net/pipermail/fotUnsubscribe/Manage>=20
: http://autox.team.net/mailman/options/fot/rkramer56@gmail.com=20
_______________________________________________
http://www.fot-racing.com
Archive: http://autox.team.net/archive <http://autox.team.net/archive> =
http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/gasket.works@gte.net
_______________________________________________
http://www.fot-racing.com
Archive: http://autox.team.net/archive <http://autox.team.net/archive> =
http://www.team.net/pipermail/fot
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>If the block is =
cracking from head stud to water jacket, it is normally caused by =
tightening the head studs in the block.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>To avoid cracks, run the studs in =
by hand, without any tool. That is enough.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Tighten them will split the =
block.<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'>The torque of the head nuts are at =
the limit of what the block can take, that=E2=80=99s why the split in =
the thread hole zone when the studs are wrenched =
in.<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><p =
class=3DMsoNormal><b>Von:</b> Fot <fot-bounces@autox.team.net> =
<b>Im Auftrag von </b>fubog1 via Fot<br><b>Gesendet:</b> Dienstag, 14. =
Januar 2020 22:00<br><b>An:</b> fot@autox.team.net<br><b>Betreff:</b> =
Re: [Fot] Main brg strap<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><div =
id=3Dyiv9217778070><div><div><blockquote =
style=3D'margin-left:6.75pt;margin-right:0cm'><div =
id=3Dyiv9217778070><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Tha=
t crack is pretty common with these, a Timesert or similar is the =
correct repair.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Re =
the center main cap strap, in my experience, these are engines are good =
up to 6.5kish, if it has a good crank & all is within spec and well =
balanced, and the loads are within reasonable =
limits.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Bey=
ond that the bending loads increase with RPM, due to the recip weight =
heavily loading that center main, and it gets =
overloaded.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Onc=
e the cap deforms and/or fastener stretches, ie it's not round anymore =
and not supporting the bearings, the bad stuff starts to =
happen.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>You=
can tell if it getting overloaded, measure the center journal very =
carefully, we're into tenths now, and note where the wear is, it's =
normally even all around the journal.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Whe=
n the load gets too heavy the wear will be mostly on the crankpin side =
of the journal; it will be very =
obvious.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>At =
that point a center strap will help for sure but the loads will still be =
there unless weight is reduced.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Thi=
s is why I try to focus on torque vs high RPM HP with these =
engines.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:=
p> </o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Gle=
n<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:=
p> </o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:=
p> </o:p></span></p><div><div id=3Dyiv9217778070yqtfd74137><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>On =
Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <<a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a>> =
wrote:<o:p></o:p></span></p></div></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div =
id=3Dyiv9217778070yqtfd38436><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Wel=
l it=E2=80=99s finally time to build a new motor... the crack at the =
rear head bolt just won=E2=80=99t stop leakin =
anymore...so...<br>I=E2=80=99ve found the Chevy front strap to use on =
the center main, but what are you using for main bolts/studs for the =
additional length?<br>How about a complete set of fasteners for the =
mains? Does ARP make anything?<br><br>Motoring on in =
NORCAL<br>Nick<br><br>Sent from the wilds of NorCal =
<br>_______________________________________________<br><a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a><br><br><a =
href=3D"http://www.fot-racing.com"; =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <a =
href=3D"http://autox.team.net/archive"; =
target=3D"_blank">http://autox.team.net/archive</a> <a =
href=3D"http://www.team.net/pipermail/fotUnsubscribe/Manage"; =
target=3D"_blank">http://www.team.net/pipermail/fot<br>Unsubscribe/Manage=
</a><o:p></o:p></span></p></div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>: =
<a =
href=3D"http://autox.team.net/mailman/options/fot/rkramer56@gmail.com"; =
target=3D"_blank">http://autox.team.net/mailman/options/fot/rkramer56@gma=
il.com</a> <o:p></o:p></span></p><div id=3Dyiv9217778070yqtfd54929><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><br=
><br><o:p></o:p></span></p></div></blockquote></div></div></div><div =
id=3Dyiv9217778070yqtfd12585><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>___=
____________________________________________<br><a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a><br><br><a =
href=3D"http://www.fot-racing.com"; =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <a =
href=3D"http://autox.team.net/archive"; =
target=3D"_blank">http://autox.team.net/archive </a><a =
href=3D"http://www.team.net/pipermail/fot"; =
target=3D"_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Ma=
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gte.net</a><br><br><o:p></o:p></span></p></div></blockquote></div></div><=
/div><p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
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