1 - Newly rebuilt spitfire engine (I assume new rings installed) The rings
wont bed in for about 500 miles. The new engine _may_ burn a bit of oil for
a while but normal.
2- you fail to indicate whether this is a HiComp or LoComp engine. (I
Assume Hi) The factory spec is 135 psi after running in.
3 - Oil in cylinders _always_ results in BLUE smoke, excess Fuel in
cylinders _always_ results in BLACK smoke.
Wayne Burton
53 Austin AA40 Somerset
63 Spitfire 4
66 Triumph 2000
(And several others)
-----Original Message-----
From: Craig Smith <CraigS@iewc.com>
To: 'wizardz' <wizardz@maxinter.net>; MishimaSky@aol.com
<MishimaSky@aol.com>
Cc: 'Spitfire List' <Spitfires@autox.team.net>; Andrew Mace
<amace@unix2.nysed.gov>
Date: Wednesday, July 14, 1999 8:11 AM
Subject: RE: black cloud
>
>I have quick question,
>I used a nice FelPro compression tester the other day on my newly rebuilt
71
>Spit engine.
>the engine was cold, I got the following
>#1 119lbs
>#2 112lbs
>#3 119lbs
>#4 112lbs
>Anything unusual, or is this good ?
>
>
>-----Original Message-----
>From: wizardz [mailto:wizardz@maxinter.net]
>Sent: Wednesday, July 14, 1999 9:18 AM
>To: MishimaSky@aol.com
>Cc: 'Spitfire List'; Andrew Mace
>Subject: black cloud
>
>
>
>this message was forwarded from the VTR to the Spitfire list.....
>
>It sounds like your valve guides may be badly worn.
>At idle, oil is being pumped up into the valve cover, and at lo
>rpms the oil is running down the valve giudes and accumulating in the
>cylinders.
>As you hit the gas to go... this excess oil has to burn away first, before
a
>good clean
>flame front can expand in the cyl. as the gas ignites.
>
>This puff of black smoke is either the oil being burned off, an overly rich
>mixture burning off
>or the carbon in the cyls. being burned.
>
>My ...best guess... would be oil in your exhaust ports via the valve
giudes.
>At speed this would burn off drip by drip as it entered the ports, so you'd
>never notice it.
>Do a compression check. ...all spark plugs removed, carb throat wedged
open.
>Do it once dry, then a second time after injecting 10-20 cc of light oil
>into the cyl.
>you are about to test. If both sets of comp. tests show less than a 10-20
>psi change
>chances are your piston rings are not the problem.
>
>Do a vacuum test. A steady idle vacuum should be roughly 19-22 in/Hg of
vac.
>and very steady. If it jumps around more than 2 in/Hg.. chances are you may
>have a burned
>and/or very worn valve.
>
>YMMV ... just a few thing to consider.
>
>Paul Tegler
>1973 BGT - Daily Driver
>1975 Spitfire -in Cherry Shape
>1980 Spitfire w/ O/D - in re-hab
>email: wizardz@toad.net
>http://www.teglerizer.com
>Follow 'Projects' for MG and Triumph stuff)
>
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