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firstly, are you 100% sure the caps are correctly fitted both round the
right way and in number order?
you need to decide if the caps are misaligned across the block or if the
tunnel is simply oval because the hole in in cap is too far up or down.
this will need a combination of feel and measurement
if the alternative caps have a significant step to 1 side, so you will
clearly feel a ledge at the mating faces when they are tightened up
if the stap is very minor, like a few thousandths of an inch, then the
faces of the cap are machined down to create an oval hole, then it it is
align honed
if it is really bad, like many tens of thou, then you have to firstly move
the cap sideways by machining the register on 1 side and peening it on the
other, and effectively moving it sideways, followed by boring/honing
sometimes, the bolts are too neat a fit to allow this and if thats the
case, its usually easier to find some other caps or make them
if the tunnel is simply an oval because the cap is too far up or down, this
is usually easily fixed by facing the cap mating surfaces and reboring the
tunnels
not all engine machine shop have a line borer...mine did not, so
subcontracting the job is not uncommon
the end result should be a perfectly round hole with a super fine hone
(cross-hatch) mark on the bearing faces, to ensure perfect bearing
shell contact
Terry
Australia
On Tue, Mar 24, 2020 at 1:32 AM Bud Rolofson via Fot <fot@autox.team.net>
wrote:
> Speaking of main caps I bought a block that turned out to not have the
> original main caps. The caps on there did not match up with the block but
> I=E2=80=99ve been unable to find a machine shop that can machine them so =
there=E2=80=99s a
> round hole for the crank. The shop I had do my last block (and they do 42=
7
> race engines among others and are well respected) told me that the result
> would be ovaled out holes (not round) which obviously is not good.
> Certainly there=E2=80=99s a way to make this work but I haven=E2=80=99t f=
ound it. I
> checked out another block shop but said they subcontract line-boring to t=
he
> the shop that said they couldn=E2=80=99t do it.
>
> Has anyone else encountered this problem? I=E2=80=99ve heard that steel m=
ains
> might be an answer but they=E2=80=99d still have to be line-bored to make=
them
> match. I hate to ship a block to get this done before I have reassurances
> that they can make it work but does anyone know of that has successfully
> made main caps match the block? Given I=E2=80=99m spending a lot of time =
these days
> staying home and catching up on car projects in the shop I figured it wou=
ld
> be a good time to start building the next engine.
>
> Solutions or recommendations?
>
> Thanks
> Bud
>
>
>
> On Mar 22, 2020, at 9:33 PM, Brad Eells via Fot <fot@autox.team.net>
> wrote:
>
> Amici,
>
> In typically rookie race engine builder mode with the block I selected fo=
r
> rebuild, I pulled the main bearing caps (with my new fancy DeWalt 20V
> Impact Wrench) and then couldn't remember which way around they went.
>
> This led to visions of catastrophic failure somewhere down the road. Yet,
> I had several other blocks I could flip over and make a determination if
> need be.
>
> I was examining one of the caps when I discovered the faintest engraving
> on the surface of each cap:
>
> Eng #2 Front Fwd
> Eng #2 Mid Fwd
> Eng #2 Rr Fwd
>
> Doug Brown, my original owner/builder/driver extraordinaire had engraved
> each cap for me to make sure a mistake didn't occur. He rotated 3 engines
> during each season in a quest for Divisional and National Championships.
>
> I guess that is the way a aeronautical/mechanical engineer and very
> successful racer thinks.
>
> Thanks again Doug!
>
> <IMG_8745.jpg>
>
> Cheers,
>
>
> *Brad Eells*
> *Chino CA*
> *#72 FP 1969 Triumph Spitfire Mk3*
> *#35 DP 1962 Triumph TR4*
> *1965 Triumph TR4A IRS...for the road!*
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/levilevi@comcast.net
>
>
>
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/enquiries@roadandtrack.net.au
>
>
>
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<div dir=3D"ltr">firstly, are you 100% sure the caps are correctly fitted b=
oth round the right way and in number order?<div><br></div><div>you need to=
decide if the caps are misaligned across the block or if the tunnel is sim=
ply oval because=C2=A0the hole in in cap is too far up or down. this will n=
eed a combination of feel and measurement<br><div><br></div><div><div>if th=
e alternative=C2=A0caps have a significant step to 1 side, so you will clea=
rly feel a ledge at the mating faces when they are tightened up<br></div><d=
iv><div><br></div><div>if the stap is very minor, like a few thousandths=C2=
=A0of an inch, then the faces of the cap are machined down to create an ova=
l hole, then it it is align honed</div><div><br></div><div>if it is really =
bad, like many tens of thou, then you have to firstly move the cap sideways=
by machining the register on 1 side and peening=C2=A0it on the other, and =
effectively moving it sideways, followed by boring/honing</div><div><br></d=
iv><div>sometimes, the bolts are too neat a fit to allow this and if thats =
the case, its usually easier to find some other caps or make them</div><div=
><br></div><div>if the tunnel is simply=C2=A0an=C2=A0oval because the cap i=
s too far up or down, this is usually easily fixed by facing the cap mating=
surfaces and reboring the tunnels</div><div><br></div><div>not all engine =
machine shop have a line borer...mine did not, so subcontracting the job is=
not uncommon</div><div><br></div><div>the end result should be a perfectly=
round hole with a super fine hone (cross-hatch) mark on the bearing faces,=
to ensure=C2=A0perfect bearing shell=C2=A0contact</div><div><br></div><div=
>=C2=A0Terry</div><div>Australia</div><div><br></div><div><div><div dir=3D"=
ltr" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div>=
<div dir=3D"ltr"><div><br></div></div></div></div></div></div></div></div><=
/div></div></div></div></div></div><br></div></div></div></div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Mar =
24, 2020 at 1:32 AM Bud Rolofson via Fot <<a href=3D"mailto:fot@autox.te=
am.net" target=3D"_blank">fot@autox.team.net</a>> wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex"><div>Speaking of main caps I bo=
ught a block that turned out to not have the original main caps. The caps o=
n there did not match up with the block but I=E2=80=99ve been unable to fin=
d a machine shop that can machine them so there=E2=80=99s a round hole for =
the crank. The shop I had do my last block (and they do 427 race engines am=
ong others and are well respected) told me that the result would be ovaled =
out holes (not round) which obviously is not good.<div>Certainly there=E2=
=80=99s a way to make this work but I haven=E2=80=99t found it. I checked o=
ut another block shop but said they subcontract line-boring to the the shop=
that said they couldn=E2=80=99t do it.=C2=A0</div><div><br></div><div>Has =
anyone else encountered this problem? I=E2=80=99ve heard that steel mains m=
ight be an answer but they=E2=80=99d still have to be line-bored to make th=
em match. I hate to ship a block to get this done before I have reassurance=
s that they can make it work but does anyone know of that has successfully =
made main caps match the block? Given I=E2=80=99m spending a lot of time th=
ese days staying home and catching up on car projects in the shop I figured=
it would be a good time to start building the next engine.</div><div><br><=
/div><div>Solutions or recommendations?</div><div><br></div><div>Thanks</di=
v><div>Bud<br><div><br></div><div>=C2=A0<br><div><blockquote type=3D"cite">=
<div>On Mar 22, 2020, at 9:33 PM, Brad Eells via Fot <<a href=3D"mailto:=
fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a>> wrote:</di=
v><br><div><div dir=3D"ltr">Amici,<div><br></div><div>In typically rookie r=
ace engine builder mode with the block I selected for rebuild, I pulled the=
main bearing caps (with my new fancy DeWalt 20V Impact Wrench) and then co=
uldn't remember which way around they went.=C2=A0</div><div><br></div><=
div>This led to visions of catastrophic failure somewhere down the road. Ye=
t, I had several other blocks I could flip over and make a determination if=
need be.</div><div><br></div><div>I was examining one of the caps when I d=
iscovered the faintest engraving on the surface of each cap:<br><br>Eng #2 =
Front Fwd</div><div>Eng #2 Mid Fwd</div><div>Eng #2 Rr Fwd</div><div><br></=
div><div>Doug Brown, my original owner/builder/driver extraordinaire had en=
graved each cap for me to make sure a mistake didn't occur. He rotated =
3 engines during each season in a quest for Divisional and National Champio=
nships.</div><div><br></div><div>I guess that is the way a aeronautical/mec=
hanical engineer and very successful=C2=A0racer thinks.</div><div><br></div=
><div>Thanks again Doug!</div><div><br></div><div><div><span id=3D"gmail-m_=
-3422984220944576185gmail-m_2395422064748517556cid:ii_k83wus460"><IMG_87=
45.jpg></span><br></div><div><br></div><div>Cheers,</div><div><br></div>=
<div><br></div><div><div dir=3D"ltr"><div dir=3D"ltr"><div><div dir=3D"ltr"=
><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><=
div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div><div style=3D"font-size:12.8px"><b><font>Bra=
d Eells</font></b></div><div style=3D"font-size:12.8px"><b><font>Chino CA</=
font></b></div><div style=3D"font-size:12.8px"><b><font>#72 FP 1969 Triumph=
Spitfire Mk3</font></b></div><div style=3D"font-size:12.8px"><b><font>#35 =
DP 1962 Triumph TR4</font></b></div><div style=3D"font-size:12.8px"><b><fon=
t>1965 Triumph TR4A IRS...for the road!</font></b><br></div></div><div styl=
e=3D"font-size:12.8px"><b><font><img src=3D"https://docs.google.com/uc?expo=
rt=3Ddownload&id=3D1HyYLxa1_Lz_Q0kLM3GRJryNDgfOwZyUc&revid=3D0B9vVT=
DWaFCqFVmR6Q1FsMExZTHVLcHpja3BpSC9ucGcveHdJPQ" width=3D"96" height=3D"94"><=
br></font></b></div><div><br></div></div></div></div></div></div></div></di=
v></div></div></div></div></div></div></div></div></div></div></div>
_______________________________________________<br><a href=3D"mailto:fot@au=
tox.team.net" target=3D"_blank">fot@autox.team.net</a><br><br><a href=3D"ht=
tp://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">=
m.net/archive" target=3D"_blank">http://autox.team.net/archive</a> <a href=
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t/pipermail/fot</a><br>Unsubscribe/Manage: <a href=3D"http://autox.team.net=
/mailman/options/fot/levilevi@comcast.net" target=3D"_blank">http://autox.t=
eam.net/mailman/options/fot/levilevi@comcast.net</a><br><br><br></div></blo=
ckquote></div><br><div>
Bud Rolofson<br><br>Extreme Parts Racing=C2=A0(more than just a haircut)<br=
><br>71TR6 CC57365 (Good=C2=A06)<br>71 Spitfire MK IV Race=C2=A0Car #3<br>6=
9 Spitfire MK III (back=C2=A0up FE engine/dinghy car)<br>93 Minnie Winnie R=
ace=C2=A0Support Vehicle=C2=A0<br>77 Z-50A Hardly=C2=A0Davidson Honda Mini-=
Trail Bike (Triumph Pit=C2=A0Bike)
</div>
<br></div></div></div>_______________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
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<br>
</blockquote></div>
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