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That crack is pretty common with these, a Timesert or similar is the correc=
t 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 wel=
l balanced, and the loads are within reasonable limits.Beyond that the bend=
ing loads increase with RPM, due to the recip weight heavily loading that c=
enter main, and it gets overloaded.Once the cap deforms and/or fastener str=
etches, 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 c=
enter journal very carefully, we're into tenths now, and note where the wea=
r is, it's normally even all around the journal.When the load gets too heav=
y the wear will be mostly on the crankpin side of the journal; it will be v=
ery obvious.At that point a center strap will help for sure but the loads w=
ill still be there unless weight is reduced.This is why I try to focus on t=
orque 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> wr=
ote:
Well it=E2=80=99s finally time to build a new motor... the crack at the rea=
r 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 wha=
t 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
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m
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<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"yiv9217778070">
<div>
<div><blockquote style=3D"margin:0 0 0 9px;padding:0 0 0 9px;">
<div id=3D"yiv9217778070">
<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 starts =
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 class=3D"yiv9217778070gmail_quote">
<div class=3D"yiv9217778070yqt5815135441" id=3D"yiv9217778070yqtfd74137">
<div class=3D"yiv9217778070gmail_attr" dir=3D"ltr">On Mon, Jan 13, 2020 at =
10:43 PM Nick Black via Fot <<a rel=3D"noopener noreferrer" shape=3D"rec=
t" ymailto=3D"mailto:fot@autox.team.net"; target=3D"_blank" href=3D"mailto:f=
ot@autox.team.net">fot@autox.team.net</a>> wrote:<br clear=3D"none"></di=
v>
</div>
<blockquote class=3D"yiv9217778070gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div class=3D"yiv9217778070yqt5815135441" id=3D"yiv9217778070yqtfd38436">We=
ll 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 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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