--===============6281168742756410308==
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Haven=E2=80=99t figured out the problem yet, but I thought this =
explanation from Longacre on how a leakdown gauge works might interest =
you all.
"The leak down gauge is simply a 100 psi gauge that reads backwards from =
a tire pressure gauge. Basically if you have 100 psi going to your =
cylinder and it doesn=E2=80=99t leak down at all then it will show you 0 =
leak down and/or 100 psi if it was a normal pressure gauge. If your =
regulator is set higher then 100 then the leakdown gauge will go below =
zero because its showing a higher pressure."
So, one of my gauges is no longer reading correctly, as I=E2=80=99m =
getting a higher pressure on the cylinder than on the supply, on some =
cylinders. Have to swap them out to figure out which, and then I=E2=80=99=
ll be able to determine how much leakdown there really is. =20
More to follow this weekend!
On May 22, 2019, at 7:05 AM, John Styduhar <johnstydo@gmail.com> wrote:
If you have an accusump, check if the valve is operating properly. =
Maybe the valve was closed accidentally during running and the engine =
oil level was excessive. =20
On Wed, May 22, 2019 at 6:54 AM Robert Lang via Fot <fot@autox.team.net =
Hi,
First off - I'd only to the leakdown test with the engine hot. Cold =
numbers don't really count. The numbers that you give look pretty good =
from a leakdown perspective. As a point of reference, with >10% leakdown =
into the sump in a couple of cylinders, you will see oil drip out of the =
strangest places (like around the nuts holding the valve cover down and =
the filler cap to which you refer.) So, either your gauge is lying or =
you need to verify your numbers with the engine at operating temps (and =
see if the numbers change). If you have access to another gauge, that =
might help figure out if anything is wrong. Oh, and is there any oil =
fouling on the plugs? Blow by should also introduce some oil into the =
cylinders when you lift off...
I think Marcel's suggestion has merit.
Let us know if you find anything.
Regards,
Bob Lang
On Wednesday, May 22, 2019, 4:14:19 AM EDT, van.mulders.marcel--- via =
If the catch can has a connection to a (low) spot of the crankcase, lots =
of oil can be pushed into the catch can at the track curves, especially =
when the duct between the crankcase and the can has only a small =
diameter, then the oil cannot return to the crankcase. It means there is =
some blow by, but maybe the symptoms are not necessarily bad news.
Marcel
Verzonden: Woensdag 22 mei 2019 04:31:47
Onderwerp: [Fot] Oil Blow-by Cause?
I just had a great weekend at Summit Point, perfect weather, four days =
and lots of track time, some quick laps and good racing. =20
After my last session, I noticed some dripping oil as I put the car in =
the trailer.
Got it home to find a half full catch can (1 pint?), and evidence of oil =
blowing out of the valve cover cap vent hole.
Tonight I ran a compression test and leakdown test. Cold engine =
results:
1 - 200 and 2%
2- 180 and 6%
3 - 180 and 9%
4 - 195 and 0%
5 - 190 and 0%
6 - 185 and 0%
Note - I suspect my longacre leakdown gauge may not be reading quite =
right, as when i have the air side set to 100, the leakdown % on the =
last three is slightly below zero. So, perhaps the leakdown on the =
first three is higher.=20
There was no excess oil until the last session. Oil pressure is about =
50 hot at idle and 65 - 75 at speed, depending on RPM.
EGT readings remained in the 1200 - 1250 range across three monitored =
cylinders at top speed
What do i have - failing rings? =20
Any diagnosis or tests you recommend before I start pulling the thing =
apart would be appreciated.
Triumphs racing - I=E2=80=99m sure I=E2=80=99m missing a few but this is =
who I remember.
TR3 - John Hasty, Henry Frye, John Styduhar
GT6 - me, Paul King, Jason Sukey, Jay De Pol until his diff case broke
Spitfire - Russ Moore, Marty Sukey, Jeff Govert, Kent Bain, others=20
Tr4 - Mark Wheatley, Allen Goode, I=E2=80=99m missing at least another =
one
Scott Janzen
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Haven=E2=80=99t figured out the problem yet, but I thought =
this explanation from Longacre on how a leakdown gauge works might =
interest you all.<div class=3D""><br class=3D""></div><div =
class=3D"">"<span style=3D"font-family: Calibri, sans-serif; font-size: =
14.666666984558105px;" class=3D"">The leak down gauge is simply a 100 =
psi gauge that reads backwards from a tire pressure gauge. Basically if =
you have 100 psi going to your cylinder and it doesn=E2=80=99t leak down =
at all then it will show you 0 leak down and/or 100 psi if it was a =
normal pressure gauge. If your regulator is set higher then 100 then the =
leakdown gauge will go below zero because its showing a higher =
pressure."</span></div><div class=3D""><div><br class=3D""></div><div>So, =
one of my gauges is no longer reading correctly, as I=E2=80=99m getting =
a higher pressure on the cylinder than on the supply, on some cylinders. =
Have to swap them out to figure out which, and then I=E2=80=99ll =
be able to determine how much leakdown there really is. =
</div><div><br class=3D""></div><div>More to follow this =
weekend!</div><div><div class=3D""><br class=3D""></div><div class=3D"">On=
May 22, 2019, at 7:05 AM, John Styduhar <<a =
href=3D"mailto:johnstydo@gmail.com"; class=3D"">johnstydo@gmail.com</a>>=
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D""><div class=3D"gmail_default" =
style=3D"font-size:small">If you have an accusump, check if the valve is =
operating properly. Maybe the valve was closed accidentally during =
running and the engine oil level was =
excessive. </div></div><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, May =
22, 2019 at 6:54 AM Robert Lang via Fot <<a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a>> =
wrote:<br class=3D""></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div =
class=3D"gmail-m_8974874906473699492ydp2edd5880yahoo-style-wrap" =
style=3D"font-family:"Helvetica =
Neue",Helvetica,Arial,sans-serif;font-size:13px"><div =
class=3D""></div>
<div class=3D"">Hi,</div><div class=3D""><br class=3D""></div><div=
class=3D"">First off - I'd only to the leakdown test with the engine =
hot. Cold numbers don't really count. The numbers that you give look =
pretty good from a leakdown perspective. As a point of reference, with =
>10% leakdown into the sump in a couple of cylinders, you will see =
oil drip out of the strangest places (like around the nuts holding the =
valve cover down and the filler cap to which you refer.) So, either your =
gauge is lying or you need to verify your numbers with the engine at =
operating temps (and see if the numbers change). If you have access to =
another gauge, that might help figure out if anything is wrong. Oh, and =
is there any oil fouling on the plugs? Blow by should also introduce =
some oil into the cylinders when you lift off...<br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">I think Marcel's =
suggestion has merit.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Let us know if you find anything.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div><div class=3D"">Bob =
Lang<br class=3D""></div><div class=3D""><br class=3D""></div>
=20
</div><div =
id=3D"gmail-m_8974874906473699492yahoo_quoted_8561256062" =
class=3D"gmail-m_8974874906473699492yahoo_quoted">
<div style=3D"font-family:"Helvetica =
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42)" =
class=3D"">
=20
<div class=3D"">
On Wednesday, May 22, 2019, 4:14:19 AM EDT, =
van.mulders.marcel--- via Fot <<a href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank" class=3D"">fot@autox.team.net</a>> wrote:
</div>
<div class=3D""><br class=3D""></div>
<div class=3D""><br class=3D""></div>
<div class=3D""><div =
id=3D"gmail-m_8974874906473699492yiv8845066306" class=3D""><div =
class=3D""><div style=3D"font-family: Verdana, Arial, Helvetica, =
sans-serif; font-size: 10pt;" class=3D""><div class=3D"">If the catch =
can has a connection to a (low) spot of the crankcase, lots of oil can =
be pushed into the catch can at the track curves, especially when the =
duct between the crankcase and the can has only a small diameter, then =
the oil cannot return to the crankcase. It means there is some blow by, =
but maybe the symptoms are not necessarily bad news.</div><div =
class=3D"">Marcel</div><div class=3D""><br clear=3D"none" =
class=3D""></div><hr id=3D"gmail-m_8974874906473699492yiv8845066306zwchr" =
class=3D""><div =
class=3D"gmail-m_8974874906473699492yiv8845066306yqt7826991802" =
id=3D"gmail-m_8974874906473699492yiv8845066306yqtfd94441"><div =
class=3D""><b class=3D"">Van: </b>"fot" <<a =
href=3D"mailto:fot@autox.team.net"; target=3D"_blank" =
class=3D"">fot@autox.team.net</a>><br clear=3D"none" class=3D""><b =
class=3D"">Aan: </b>"fot" <<a href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank" class=3D"">fot@autox.team.net</a>><br clear=3D"none" =
class=3D""><b class=3D"">Verzonden: </b>Woensdag 22 mei 2019 04:31:47<br =
clear=3D"none" class=3D""><b class=3D"">Onderwerp: </b>[Fot] Oil Blow-by =
Cause?<br clear=3D"none" class=3D""></div><br clear=3D"none" =
class=3D""></div><div class=3D""><div =
class=3D"gmail-m_8974874906473699492yiv8845066306yqt7826991802" =
id=3D"gmail-m_8974874906473699492yiv8845066306yqtfd88235">I just had a =
great weekend at Summit Point, perfect weather, four days and lots of =
track time, some quick laps and good racing. <div =
class=3D"gmail-m_8974874906473699492yiv8845066306">After my last =
session, I noticed some dripping oil as I put the car in the =
trailer.</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">Got =
it home to find a half full catch can (1 pint?), and evidence of oil =
blowing out of the valve cover cap vent hole.</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Tonight I ran a =
compression test and leakdown test. Cold engine results:</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306"><br =
class=3D"gmail-m_8974874906473699492yiv8845066306" =
clear=3D"none"></div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">1 - 200 and =
2%</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">2- 180 =
and 6%</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">3 - =
180 and 9%</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">4 =
- 195 and 0%</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">5 - 190 and =
0%</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">6 - 185 =
and 0%</div><div class=3D"gmail-m_8974874906473699492yiv8845066306"><br =
class=3D"gmail-m_8974874906473699492yiv8845066306" =
clear=3D"none"></div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Note - I suspect my =
longacre leakdown gauge may not be reading quite right, as when i have =
the air side set to 100, the leakdown % on the last three is slightly =
below zero. So, perhaps the leakdown on the first three is =
higher. </div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">There was no excess =
oil until the last session. Oil pressure is about 50 hot at idle =
and 65 - 75 at speed, depending on RPM.</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">EGT readings remained =
in the 1200 - 1250 range across three monitored cylinders at top =
speed</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">What =
do i have - failing rings? </div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Any diagnosis or =
tests you recommend before I start pulling the thing apart would be =
appreciated.</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306"><br =
class=3D"gmail-m_8974874906473699492yiv8845066306" =
clear=3D"none"></div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Triumphs racing - =
I=E2=80=99m sure I=E2=80=99m missing a few but this is who I =
remember.</div><div class=3D"gmail-m_8974874906473699492yiv8845066306">TR3=
- John Hasty, Henry Frye, John Styduhar</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">GT6 - me, Paul King, =
Jason Sukey, Jay De Pol until his diff case broke</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Spitfire - Russ =
Moore, Marty Sukey, Jeff Govert, Kent Bain, others </div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Tr4 - Mark Wheatley, =
Allen Goode, I=E2=80=99m missing at least another one</div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306"><br =
class=3D"gmail-m_8974874906473699492yiv8845066306" =
clear=3D"none"></div><div =
class=3D"gmail-m_8974874906473699492yiv8845066306">Scott =
Janzen</div><div class=3D"gmail-m_8974874906473699492yiv8845066306"><br =
class=3D"gmail-m_8974874906473699492yiv8845066306" =
clear=3D"none"></div><br clear=3D"none" =
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