I will check out more stuff and if at all possible make it be a valve problem. Hopefully I can just rip off the head and fix that...
I'll keep you informed and BTW The SCCA National runoffs are coming up on Sept. 19-22 At RoadAmerica if there might be anyone out there that lives close enough to get there besides me..
Thanks. P.J.
--Previous Message--
: The rear cylinders are prone to getting
: oil down the stems/guides because there
: is usually more oil in the rear of the
: rocker box.
: There are infinite possibilities, oil
: ring/groove damage included, but I
: don't know of any way to check without
: a teardown, at some point.
: BTW the second compression ring is also
: an oil scraper so it may be a
: "player" here too ie possibly
: fitted upside-down.
: BTW I had one that really drove me nuts
: a few years ago. Fresh rebuild (XPAG
: engine T-series), oiling a cylinder
: after a couple hundred miles. Pulled
: the head and could see the wet valve,
: seal intact and specs right on. ???.
: Turns out that the oil was going by the
: OUTSIDE of the guide, there was a heavy
: score in the guide bore, from when the
: guides were replaced...
: Anything is possible, troubleshooting
: is often the most difficult part of the
: job.
: Glen
: feeling your pain
:
:
: --Previous Message--
: Hi.
: Not sure what stem to guide clearance
: was but the head was done at a decent
: shop in the area and when I got it back
: and inspected it all looked and felt
: good. There are stem seals on the
: intakes. There are stainless valves in
: this head if that could make a
: difference as far as expansion or
: whatever. But you would think if that
: were the case it would be similar for
: all cylinders.
: Is it possible that number six oil
: rings could be stuck in the grooves?
: P.J.
: --Previous Message--
: Well the higher compression in #6 is
: consistent with a cylinder getting
: oiled, similar to a "wet"
: compression test.
: Assuming that it is oil smoke, and
: there isn't heavy crankcase pressure,
: inlet guide/seal and oil rings are the
: two primary suspects.
: If it's going by the guide, it will
: suck it in under closed throttle ie
: downshift decell, rings will smoke
: heavy on acceleration.
: If it's going down the valve
: stem/guide, and it's real bad, the
: underhead of the valve will actually be
: wet with oil, you can see it.
: The progression of fouling towards the
: rear does suggest the possibility of it
: getting down from the head, due to the
: design of the oiling system, a lot more
: oil is in the rear of the rocker box.
: Do you know what the stem/guide
: clearances are, and if there are seals
: on the inlet valves?
: Glen
:
:
: --Previous Message--
: Hi.
: I did some testing tonight and here is
: what I found.
: Compression. 150,150,160,160,160,175
: Plugs were white grey(1-2)
: Black sooty(3-5}
: Black oil fouled(6)
: I also checked fuel pressure at about
: 2-3 Lbs. Don't have a really good guage
: but the point was to make sure the fuel
: pressure was not overpowering the carb.
: floats and it was not.
: I swapped out spark plugs with a clean
: set and ran the engine for a few
: minutes up and down RPM range. Checked
: plugs again and exact same results.
: Number Six cylinder obviously has some
: issues.. Now what??
: P.J.
: --Previous Message--
: O.K. I might be starting to think
: about a fix now.... Is there any way to
: know if the oil rings are shot or maybe
: a better way to put it would be: Can
: the oil rings be bad and compression
: rings be O.K.?
:
: Yes oil rings can cause problems if
: they are incorrectly fitted or damaged
: in some way.
: Obviously it won't show up on a
: leakdown or compression test though.
: BTW, if you suspect a fuel related
: issue, you can actually smell the fuel
: in the oil and the drain oil will be
: very thin. As it gets worse you will
: also see a drop in oil pressure.
: Glen
:
:
: --Previous Message--
:
:
: --Previous Message--
: Yes as Doug mentioned, it could very
: well
: be a fuel issue.
: If it's running too rich, you will get
: the obvious (darker colored) smoke, but
: it will also wash down the cylinders,
: dilute the oil, and start burning oil.
: Long term results are heavy cylinder
: bore and top ring/groove wear.
:
: Remember... a problem is just the
: beginning of a solution...
: Keep us posted,
: Glen
:
: --Previous Message--
: Hi.
: I don't see any oil fouling on the
: plugs but they are black and soot
: covered. I have not done any tests yet.
: I did do one very smokey burnout, said
: some very choice words and parked the
: little bugger in the garage. I keep
: hoping it's a fuel problem like the
: webers are way too rich but I switched
: to the leanest set of main jets I have
: and it was no better. Maybe when the
: weather breaks I'll get some testing
: done or maybe I'll give Craigs list a
: try.
: P.J.
:
: --Previous Message--
: Just a couple thoughts, keeping in mind
: the fact that the problem exists with 2
: different engines...
: An external top-oiler without a
: restrictor will fill the rocker box and
: let oil down the intake guides, but
: this will smoke worst under closed
: throttle.
: Crankcase venting properly?
: Have you done (dry)compression test and
: leakdown test?
: Are any of the plugs getting oil-fouled
: yet?
:
: Old Corvette??? Geez, that's what go
: tme into sports cars, After I trashed
: my '61 (in '71), my Dad OK'd my getting
: my first TR (4), he figured I couldn't
: get in as much trouble with a little
: 4-cylinder...
: Glen
:
:
: --Previous Message--
: Hi again.
: Here we go again. I've been driving
: the GT6 a bit this summer and it's been
: running great. I absolutely love the
: Toyota T 50 trans. Shifts crisp and
: smooth. Gear ratios are perfect for the
: street. My only concern was with the
: fact that I removed the AL.flywheel and
: it really hurt performance.. HOWEVER:
: Last week I noticed the exhaust was
: starting to become noticeable. Light at
: first but getting worse. Definitely
: blue. Spark plugs are black and sooty.
: At first it was only smoking when you
: take off from a stop. Now it smokes all
: the time and when you take off from a
: stop it's a fogger. Obviously time for
: some intervention. This engine only has
: a couple thousand miles on it and I
: don't think I can make myself tear it
: down again. At least not now. Can
: anyone give me a reason WHY this thing
: is going through piston rings? Two
: years ago I tore the engine apart twice
: because I couldn't get it to stop
: smoking. Reringed it twice and finally
: gave up and rebuilt a whole different
: engine. New pistons and rings. Bored
: .030 over. New cam and cam bearings.
: New everything within reason. Freshly
: rebuilt head with seals. New valves.
: How can this be happening again???
: Might have to give up and buy an old
: Corvette soon.
: P.J.
:
:
:
:
:
:
:
: Hi.
: O.K. I might be starting to think
: about a fix now.... Is there any way to
: know if the oil rings are shot or maybe
: a better way to put it would be: Can
: the oil rings be bad and compression
: rings be O.K.?
:
:
:
:
:
:
:
:
:
:
:
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