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The engine was a fresh rebuild when bought. The car was sold because of th=
e excessive oil blowing out after the fresh rebuild. The head was taken of=
f and examined at a local machine shop and passed with flying colors. The =
pistons and rings were also taken to the shop where the machinist remarked=
that the rings might have been too small and suggested 10 over rings. New=
rings went on, everything put back into the engine and again, it runs gre=
at, just blows the oil all over the place! Michael, compression test today=
after a bit over 100 miles with the new rings: 160, 148, 120, 130. Saw so=
me suggestions on an MG forum for fixing crankcase ventilation. Will see w=
hat my neighbor decides to do and will update later. Thanks all for the wo=
rds. And just now, after driving the car another forty miles or so, the co=
mpression now sits at: 165, 155, 130, 150. So that's getting better. Will =
definitely take a closer look at the rocker shaft and bushings. Again, tha=
nks to all for the possible foibles facing this engine. Steven On Nov 16, =
2025, at 8:52 AM, Harold Manifold <manifold@telus.net> wrote: Hi Steve, Th=
e issue you described with your neighbor's 1275 engine may be related to a=
similar problem I've encountered. I know of a recently rebuilt engine tha=
t experienced comparable excessive oil blow-by. The cause, in that case, w=
as a poorly refurbished and refitted rocker shaft and bushings. Without ad=
equate restriction between the rocker shaft and the bushings to regulate t=
he oil flow, it resulted in an excessive amount of oil being pumped to the=
top of the engine. I hope this provides another avenue for investigation.=
Regards, Harold On Sat, Nov 15, 2025 at 1:12 PM Michael Salter < michael.=
salter@gmail.com > wrote: Hi Steve, what you describe sounds to me like ex=
cessive blow-by. I would recommend a compression test before going too muc=
h further. M From: Healeys < healeys-bounces@autox.team.net > on behalf of=
Steven Kingsbury via Healeys < healeys@autox.team.net > Sent: Saturday, N=
ovember 15, 2025 3:33:19 PM To: Healey Mail List < healeys@autox.team.net =
> Subject: [Healeys] Sprite question for my neighbor My neighbor bought a =
bugeye that had a 1275 engine put in it. It runs well, but blows oil like =
crazy out of the oil cap on the valve cover. It does not have a timing cov=
er ventilation valve, but a fitting was made to fit onto where the old fue=
l pump fit on the side of the crankcase/block. When he hooked the hose fro=
m that fitting to the carbs, oil was no longer being blown out, but oil wa=
s then being sucked into the carbs and he was burning oil like crazy. It s=
eems the pressure in the crankcase is so great it is pushing oil up the pu=
sh rods into the rocker assembly, out the filler cap and all over the engi=
ne. I'm not familiar with the 1275 and have no ideas on how to vent the pr=
essure in the crankcase. Can anyone of you guys point me to a possible sol=
ution? Thanks in advance for the advice. Steven Kingsbury BN1 ____________=
___________________________________ Support Team.Net http://www.team.net/d=
onate.html Suggested annual donation $12.75 Archive: http://www.team.net/p=
ipermail/healeys http://autox.team.net/archive/healeys Healeys@autox.team.=
net http://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage: htt=
p://autox.team.net/mailman/options/healeys/manifold@telus.net ____________=
___________________________________ Support Team.Net http://www.team.net/d=
onate.html Suggested annual donation $12.75 Archive: http://www.team.net/p=
ipermail/healeys http://autox.team.net/archive/healeys Healeys@autox.team.=
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p://autox.team.net/mailman/options/healeys/airtightproductions@icloud.com
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<html><body><div><br></div><div style=3D"color: rgba(0, 0, 0, 0.88);
font-family: &quo=
t;SF Pro Text", system-ui, sans-serif; font-size: 17px; font-style: n=
ormal; font-variant-ligatures: normal; font-variant-caps: normal; font-wei=
ght: 300; letter-spacing: -0.37px; orphans: 2; text-align: start; text-ind=
ent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text=
-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 2=
55); text-decoration-thickness: initial; text-decoration-style: initial; t=
ext-decoration-color: initial;">The engine was a fresh rebuild when bought=
. The car was sold because of the excessive oil blowing out after the fres=
h rebuild. The head was taken off and examined at a local machine shop and=
passed with flying colors. The pistons and rings were also taken to the s=
hop where the machinist remarked that the rings might have been too small =
and suggested 10 over rings. New rings went on, everything put back into t=
he engine and again, it runs great, just blows the oil all over the place!=
</div><div style=3D"color: rgba(0, 0, 0, 0.88); font-family: "S=
F Pro Text", system-ui, sans-serif; font-size: 17px; font-style: norm=
al; font-variant-ligatures: normal; font-variant-caps: normal; font-weight=
: 300; letter-spacing: -0.37px; orphans: 2; text-align: start; text-indent=
: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-st=
roke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255)=
; text-decoration-thickness: initial; text-decoration-style: initial; text=
-decoration-color: initial;">Michael, compression test today after a bit o=
ver 100 miles with the new rings: 160, 148, 120, 130. Saw some suggestions=
on an MG forum for fixing crankcase ventilation. Will see what my neighbo=
r decides to do and will update later. Thanks all for the words.</div><div=
style=3D"color: rgba(0, 0, 0, 0.88); font-family: "SF Pro Text"=
, system-ui, sans-serif; font-size: 17px; font-style: normal; font-variant=
-ligatures: normal; font-variant-caps: normal; font-weight: 300; letter-sp=
acing: -0.37px; orphans: 2; text-align: start; text-indent: 0px; text-tran=
sform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;=
white-space: normal; background-color: rgb(255, 255, 255); text-decoratio=
n-thickness: initial; text-decoration-style: initial; text-decoration-colo=
r: initial;">And just now, after driving the car another forty miles or so=
, the compression now sits at: 165, 155, 130, 150. So that's getting bette=
r. Will definitely take a closer look at the rocker shaft and bushings. Ag=
ain, thanks to all for the possible foibles facing this engine.</div><div =
style=3D"color: rgba(0, 0, 0, 0.88); font-family: "SF Pro Text",=
system-ui, sans-serif; font-size: 17px; font-style: normal; font-variant-=
ligatures: normal; font-variant-caps: normal; font-weight: 300; letter-spa=
cing: -0.37px; orphans: 2; text-align: start; text-indent: 0px; text-trans=
form: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
white-space: normal; background-color: rgb(255, 255, 255); text-decoration=
-thickness: initial; text-decoration-style: initial; text-decoration-color=
: initial;">Steven </div><div><div><br></div><blockquote type=3D"cite=
"><div>On Nov 16, 2025, at 8:52 AM, Harold Manifold <manifold@telus.net=
> wrote:</div><div><br></div><div><br></div><div><div dir=3D"ltr"><div>=
Hi Steve,</div><div><br></div><div>The issue you described with your neigh=
bor's 1275 engine may be related to a similar problem I've encountered.</d=
iv><div><br></div><div>I know of a recently rebuilt engine that experience=
d comparable excessive oil blow-by. The cause, in that case, was a poorly =
refurbished and refitted rocker shaft and bushings. Without adequate restr=
iction between the rocker shaft and the bushings to regulate the oil flow,=
it resulted in an excessive amount of oil being pumped to the top of the =
engine.</div><div><br></div><div>I hope this provides another avenue for i=
nvestigation.</div><div><br></div><div>Regards,</div><div>Harold</div></di=
v><div><br></div><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sat, Nov 15, 2025 at 1:12=E2=80=AFPM Mich=
ael Salter <<a href=3D"mailto:michael.salter@gmail.com";>michael.salter@=
gmail.com</a>> wrote:</div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div><div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-sys=
tem,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33)" =
dir=3D"auto">Hi Steve, what you describe sounds to me like excessive blow-=
by. </div><div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-=
system,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33=
)" dir=3D"auto">I would recommend a compression test before going too much=
further. </div><div style=3D"font-family:Aptos,Aptos_MSFontService,-=
apple-system,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(33=
,33,33)" dir=3D"auto"><br></div><div style=3D"font-family:Aptos,Aptos_MSFo=
ntService,-apple-system,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;c=
olor:rgb(33,33,33)" dir=3D"auto">M</div><div id=3D"m_8735642865022924963ms=
-outlook-mobile-body-separator-line" style=3D"font-family:Aptos,Aptos_MSFo=
ntService,-apple-system,Roboto,Arial,Helvetica,sans-serif;font-size:12pt">=
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,A=
rial,Helvetica,sans-serif;font-size:12pt"><br></div></div><div style=3D"fo=
nt-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,s=
ans-serif;font-size:12pt" id=3D"m_8735642865022924963ms-outlook-mobile-sig=
nature"><div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,=
Roboto,Arial,Helvetica,sans-serif;font-size:12pt"><br></div></div><div><hr=
style=3D"display:inline-block;width:98%"><br></div><div id=3D"m_873564286=
5022924963divRplyFwdMsg" dir=3D"ltr"><div><span style=3D"font-family:Calib=
ri, sans-serif" class=3D"font"><span style=3D"color:#000000" class=3D"colo=
r"><b>From:</b> Healeys <<a href=3D"mailto:healeys-bounces@autox.team.n=
et">healeys-bounces@autox.team.net</a>> on behalf of Steven Kingsbury v=
ia Healeys <<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.tea=
m.net</a>><br> <b>Sent:</b> Saturday, November 15, 2025 3:33:19 PM<br> =
<b>To:</b> Healey Mail List <<a href=3D"mailto:healeys@autox.team.net";>=
healeys@autox.team.net</a>><br> <b>Subject:</b> [Healeys] Sprite questi=
on for my neighbor</span></span></div><div> </div></div><div><div>My =
neighbor bought a bugeye that had a 1275 engine put in it. It runs well, b=
ut blows oil like crazy out of the oil cap on the valve cover. It does not=
have a timing cover ventilation valve, but a fitting was made to fit onto=
where the old fuel pump fit=0A on the side of the crankcase/block. When h=
e hooked the hose from that fitting to the carbs, oil was no longer being =
blown out, but oil was then being sucked into the carbs and he was burning=
oil like crazy.</div><div><br></div><div>It seems the pressure in the cra=
nkcase is so great it is pushing oil up the push rods into the rocker asse=
mbly, out the filler cap and all over the engine. I'm not familiar with th=
e 1275 and have no ideas on how to vent the pressure in the crankcase. Can=
=0A anyone of you guys point me to a possible solution? Thanks in advance =
for the advice.</div><div>Steven Kingsbury</div><div>BN1</div></div></div>=
<div>_______________________________________________</div><div> Support <a=
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Archive: http://www.team.net/pipermail/healeys
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