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Ken Gilanders and others advised us to chamfer those stud holes to prevent
raised edges as well.
Bob Kramer
On Tue, Jan 14, 2020 at 3:00 PM fubog1 via Fot <fot@autox.team.net> wrote:
> 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 goo=
d
> 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 normal=
ly
> 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.
>
> Glen
>
>
> On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <fot@autox.team.net>
> wrote:
>
> Well it=E2=80=99s finally time to build a new motor... the crack at the r=
ear 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 w=
hat 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
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<div dir=3D"ltr">Ken Gilanders and others advised=C2=A0us to chamfer those =
stud holes to prevent raised edges as well.<div><br clear=3D"all"><div><div=
dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><=
div dir=3D"ltr">Bob Kramer</div></div></div><br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 14, 2020=
at 3:00 PM fubog1 via Fot <<a href=3D"mailto:fot@autox.team.net";>fot@au=
tox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">
<div id=3D"gmail-m_3780049604753163361yiv9217778070">
<div>
<div><blockquote style=3D"margin:0px 0px 0px 9px;padding:0px 0px 0px 9px">
<div id=3D"gmail-m_3780049604753163361yiv9217778070">
<div><font size=3D"2">That crack is pretty common with these, a Timesert or=
similar is the correct repair.</font></div>
<div><font size=3D"2">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 wi=
thin spec and well balanced, and the loads are within reasonable limits.</f=
ont></div>
<div><font size=3D"2">Beyond that the bending loads increase with RPM, due =
to the recip weight heavily loading that center main, and it gets overloade=
d.</font></div>
<div><font size=3D"2">Once the cap deforms and/or fastener stretches, ie it=
's not round anymore and not supporting the bearings, the bad stuff sta=
rts to happen.</font></div>
<div><font size=3D"2">You can tell if it getting overloaded, measure the ce=
nter journal very carefully, we're into tenths now, and note where the =
wear is, it's normally even all around the journal.</font></div>
<div><font size=3D"2">When the load gets too heavy the wear will be mostly =
on the crankpin side of the journal; it will be very obvious.</font></div>
<div><font size=3D"2">At that point a center strap will help for sure but t=
he loads will still be there unless weight is reduced.</font></div>
<div><font size=3D"2">This is why I try to focus on torque vs high RPM HP w=
ith these engines.</font></div>
<div><font size=3D"2"><br>
</font></div>
<div><font size=3D"2">Glen</font></div>
<div><font size=3D"2"><br>
</font></div>
<div><font size=3D"2"></font><br>
<div>
<div id=3D"gmail-m_3780049604753163361yiv9217778070yqtfd74137">
<div dir=3D"ltr">On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <<a=
rel=3D"noopener noreferrer" shape=3D"rect" href=3D"mailto:fot@autox.team.n=
et" target=3D"_blank">fot@autox.team.net</a>> wrote:<br clear=3D"none"><=
/div>
</div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">
<div id=3D"gmail-m_3780049604753163361yiv9217778070yqtfd38436">Well it=E2=
=80=99s finally time to build a new motor... the crack at the rear head bol=
t just won=E2=80=99t stop leakin anymore...so...<br clear=3D"none">
I=E2=80=99ve found the Chevy front strap to use on the center main, but wha=
t are you using for main bolts/studs for the additional length?<br clear=3D=
"none">
How about a complete set of fasteners for the mains? Does ARP make anything=
?<br clear=3D"none">
<br clear=3D"none">
Motoring on in NORCAL<br clear=3D"none">
Nick<br clear=3D"none">
<br clear=3D"none">
Sent from the wilds of NorCal <br clear=3D"none">
_______________________________________________<br clear=3D"none">
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</blockquote></div>
</div>
</div>
<div id=3D"gmail-m_3780049604753163361yiv9217778070yqtfd12585">____________=
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