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I believe syn oil is a bit 'thinner'--even for the same nominal
viscosity; I'm going on hearsay--so a little more consumption may be
expected. My new Mustang GT uses about a quart of 5W-20 semi-syn every
5K miles or so, which is about the same as my 2008 Mustang GT used
(consistently over 135K miles). An engine has to use some oil, a very
thin 'smear' should be left on the grooves in the cylinder walls to lube
the rings and it gets burned on every combustion cycle.
What kind of valve guides and seals does he have? I believe bronze
('bronzium,' silicon bronze, etc.) guides require a little more
clearance from the valve stems for heat expansion (I've heard 0.003"),
this might allow a bit more oil into the combustion chambers. Most
builders laugh at the stock O-ring type seals; mine used a customized
'top hat' seal that they use on the race engines they build.
Bob
On 9/17/2019 7:48 AM, warthodson@aol.com wrote:
> Bob,
> The owner is aware of the issues with oil & I think he is using 20w/50
> Castrol synthetic oil. I will confirm at the meeting. On the trip to
> Conclave no one noticed any thing unusual about his exhaust. Some did
> say they say a "little black smoke, occasionally". I will be
> interested in seeing the plugs. If not rings, how else could oil be
> getting into the combustion chamber?
> Perhaps the valve stems could be leaking. How could we test for this?
> How about valve stem seals leaking?
> Gary H
>
> -----Original Message-----
> From: Bob Spidell <bspidell@comcast.net>
> To: healeys <healeys@autox.team.net>
> Sent: Tue, Sep 17, 2019 9:22 am
> Subject: Re: [Healeys] high oil consumption
>
> What brand/viscosity oil is he using?
>
> If it really isn't leaking it can only be burning it; I'd expect quite
> a bit of blue smoke out the tailpipe. My BJ8's engine was rebuilt a
> couple years ago and uses some, less than this one, but isn't leaking
> it--I was under it yesterday--and I only get a little blue smoke after
> a long downhill run in gear.
>
> Bob
>
> On 9/17/2019 7:16 AM, warthodson--- via Healeys wrote:
> Our local AH club will be checking a BJ8 for high oil consumption this
> weekend. He says it is not leaking out. We will verify that when we
> inspect it.
> He added 8 quarts of oil on the round trip to Conclave recently (2100
> miles total). The engine was professionally rebuilt in 2011. The
> engine builder has recently retired & moved to a Caribbean island so
> we cannot contact him, true story.
> In 2012 he used 6 quarts of oil on a 5000 mile trip. About 2-3 years
> ago I checked the compression, performed a leak down test & inspected
> the spark plugs. Every thing was in the normal range.
> My question is: If the engine passes all the usual tests this weekend,
> what are some of the unusual ways you have come across that could
> cause high oil consumption & how would we test for them?
>
> Gary Hodson
>
>
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I believe syn oil is a bit 'thinner'--even for the same nominal
viscosity; I'm going on hearsay--so a little more consumption may be
expected. My new Mustang GT uses about a quart of 5W-20 semi-syn
every 5K miles or so, which is about the same as my 2008 Mustang GT
used (consistently over 135K miles). An engine has to use some oil,
a very thin 'smear' should be left on the grooves in the cylinder
walls to lube the rings and it gets burned on every combustion
cycle.<br>
<br>
What kind of valve guides and seals does he have? I believe bronze
('bronzium,' silicon bronze, etc.) guides require a little more
clearance from the valve stems for heat expansion (I've heard
0.003"), this might allow a bit more oil into the combustion
chambers. Most builders laugh at the stock O-ring type seals; mine
used a customized 'top hat' seal that they use on the race engines
they build.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 9/17/2019 7:48 AM,
<a class="moz-txt-link-abbreviated"
href="mailto:warthodson@aol.com";>warthodson@aol.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1267253349.8561914.1568731699962@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="color:black;font: 10pt arial;">
<div>Bob, </div>
<div>The owner is aware of the issues with oil & I think he
is using 20w/50 Castrol synthetic oil. I will confirm at the
meeting. On the trip to Conclave no one noticed any thing
unusual about his exhaust. Some did say they say a "little
black smoke, occasionally". I will be interested in seeing the
plugs. If not rings, how else could oil be getting into the
combustion chamber? </div>
<div>Perhaps the valve stems could be leaking. How could we test
for this? How about valve stem seals leaking?</div>
<div>Gary H</div>
<br>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: Bob Spidell <a class="moz-txt-link-rfc2396E"
href="mailto:bspidell@comcast.net";><bspidell@comcast.net></a><br>
To: healeys <a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a><br>
Sent: Tue, Sep 17, 2019 9:22 am<br>
Subject: Re: [Healeys] high oil consumption<br>
<br>
<div id="yiv2063336109">
<div> What brand/viscosity oil is he using?<br clear="none">
<br clear="none">
If it really isn't leaking it can only be burning it; I'd
expect quite a bit of blue smoke out the tailpipe. My
BJ8's engine was rebuilt a couple years ago and uses some,
less than this one, but isn't leaking it--I was under it
yesterday--and I only get a little blue smoke after a long
downhill run in gear.<br clear="none">
<br clear="none">
Bob<br clear="none">
<br clear="none">
<div class="yiv2063336109yqt5570454359"
id="yiv2063336109yqt19901">
<div class="yiv2063336109moz-cite-prefix">On 9/17/2019
7:16 AM, warthodson--- via Healeys wrote:<br
clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
</div>
<div class="yiv2063336109yqt5570454359"
id="yiv2063336109yqt46831">
<div>
<div style="color:black;font:10pt arial;">
<div>Our local AH club will be checking a BJ8 for high
oil consumption this weekend. He says it is not
leaking out. We will verify that when we inspect
it. </div>
<div>He added 8 quarts of oil on the round trip to
Conclave recently (2100 miles total). The engine was
professionally rebuilt in 2011. The engine builder
has recently retired & moved to a Caribbean
island so we cannot contact him, true story.</div>
<div>In 2012 he used 6 quarts of oil on a 5000 mile
trip. About 2-3 years ago I checked the compression,
performed a leak down test & inspected the spark
plugs. Every thing was in the normal range.</div>
<div>My question is: If the engine passes all the
usual tests this weekend, what are some of the
unusual ways you have come across that could cause
high oil consumption & how would we test for
them? </div>
<div><br clear="none">
</div>
<div>Gary Hodson</div>
</div>
<br clear="none">
<br clear="none">
</div>
</div>
</div>
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