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OK, I re-ran the comp and leakdown tests. Replaced a gauge that was =
reading low on the leakdown tester, so I now trust the results. With the =
exception of #3, leakdown was almost all piston ring leak-by. #3 had =
exhaust noise too.
1 - cold leak 4%, hot leak 4%, hot comp 195, prior cold comp 200
2 - cold leak 9%, hot leak 12%, hot comp 175, pcc 180
3 - cold leak 15%, hot leak 16%, hot comp 170, pcc 180
4- cold leak 3%, hot leak 3%, hot comp 195, pcc 195
5- cold leak 4%, hot leak 4%, hot comp 172, pcc 190
6 - cold leak 3%, hot leak 5%, hot comp 170, pcc 185
The leakdown results look good to me and are probably valve related. =
I=E2=80=99m used to seeing higher numbers on a season-old motor.
Compression - I don=E2=80=99t know if the drop on 5 and 6 is normal for =
cold to hot testing. What would cause this relative to cylinders with =
almost no change?
Plugs - Kas asked about the plugs - When I pulled them the first time, =
the insulators were very light tan, almost white, with tan electrodes - =
plugs looked the way they usually look in this motor. After warm-up, =
they got darker, but not surprising since it was mostly idle time and =
nothing under load. No oil on the plugs. No visible oil coming out the =
tailpipe, same color back there as usual.
BTW, my lap times on the last session were a second off the weekend =
best, but so were most of my competitors, so the engine still seems =
strong.
At this point, unless anyone has more suggestions short of tear-down I =
guess I=E2=80=99ll run it again as-is. The oil venting points (two =
valve cover hoses) have not changed, so there was nothing that would =
have dumped more oil than usual. I have no block vent, so nothing to =
blame there.=20
I could have had a mind fart and run with the accusump valve closed =
(it=E2=80=99s manual) but when I pulled the car off the trailer there =
was oil and pressure in the accusump, so I must have shut it off full. =
Thus, there should not have been excess oil in the pan.
> -----Original Message-----
> From: Fot <fot-bounces@autox.team.net> On Behalf Of Scott Janzen via =
Fot
> Sent: Tuesday, May 21, 2019 10:32 PM
> To: 'Friends of Triumph' Triumph <fot@autox.team.net>
> Subject: [Fot] Oil Blow-by Cause?
>=20
> I just had a great weekend at Summit Point, perfect weather, four days =
and
> lots of track time, some quick laps and good racing.
> 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:
>=20
> 1 - 200 and 2%
> 2- 180 and 6%
> 3 - 180 and 9%
> 4 - 195 and 0%
> 5 - 190 and 0%
> 6 - 185 and 0%
>=20
> 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.
> 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?
> Any diagnosis or tests you recommend before I start pulling the thing =
apart
> would be appreciated.
>=20
> 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
> Tr4 - Mark Wheatley, Allen Goode, I=E2=80=99m missing at least another =
one
>=20
> 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""><div>OK, I re-ran the comp and leakdown tests. Replaced =
a gauge that was reading low on the leakdown tester, so I now trust the =
results. With the exception of #3, leakdown was almost all piston ring =
leak-by. #3 had exhaust noise too.</div><div><br =
class=3D""></div><div>1 - cold leak 4%, hot leak 4%, hot comp 195, prior =
cold comp 200</div><div>2 - cold leak 9%, hot leak 12%, hot comp 175, =
pcc 180</div><div>3 - cold leak 15%, hot leak 16%, hot comp 170, pcc =
180</div><div>4- cold leak 3%, hot leak 3%, hot comp 195, pcc =
195</div><div>5- cold leak 4%, hot leak 4%, hot comp 172, pcc =
190</div><div>6 - cold leak 3%, hot leak 5%, hot comp 170, pcc =
185</div><div><br class=3D""></div><div>The leakdown results look good =
to me and are probably valve related. I=E2=80=99m used to seeing =
higher numbers on a season-old motor.</div><div><b class=3D"">Compression =
</b>- I don=E2=80=99t know if the drop on 5 and 6 is normal for cold to =
hot testing. What would cause this relative to cylinders with =
almost no change?</div><div>Plugs - Kas asked about the plugs - When I =
pulled them the first time, the insulators were very light tan, almost =
white, with tan electrodes - plugs looked the way they usually look in =
this motor. After warm-up, they got darker, but not surprising =
since it was mostly idle time and nothing under load. No oil on =
the plugs. No visible oil coming out the tailpipe, same color back =
there as usual.</div><div>BTW, my lap times on the last session were a =
second off the weekend best, but so were most of my competitors, so the =
engine still seems strong.</div><div><br class=3D""></div><div>At this =
point, unless anyone has more suggestions short of tear-down I guess =
I=E2=80=99ll run it again as-is. The oil venting points (two valve =
cover hoses) have not changed, so there was nothing that would have =
dumped more oil than usual. I have no block vent, so nothing to =
blame there. </div><div><br class=3D""></div><div>I could have had =
a mind fart and run with the accusump valve closed (it=E2=80=99s manual) =
but when I pulled the car off the trailer there was oil and pressure in =
the accusump, so I must have shut it off full. Thus, there should =
not have been excess oil in the pan.</div><div><div class=3D""><div =
class=3D""><br class=3D""><blockquote type=3D"cite" =
class=3D"">-----Original Message-----<br class=3D"">From: Fot <<a =
href=3D"mailto:fot-bounces@autox.team.net"; =
class=3D"">fot-bounces@autox.team.net</a>> On Behalf Of Scott Janzen =
via Fot<br class=3D"">Sent: Tuesday, May 21, 2019 10:32 PM<br =
class=3D"">To: 'Friends of Triumph' Triumph <<a =
href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>><br class=3D"">Subject: [Fot] Oil =
Blow-by Cause?<br class=3D""><br class=3D"">I just had a great weekend =
at Summit Point, perfect weather, four days and<br class=3D"">lots of =
track time, some quick laps and good racing.<br class=3D"">After my last =
session, I noticed some dripping oil as I put the car in the trailer.<br =
class=3D"">Got it home to find a half full catch can (1 pint?), and =
evidence of oil blowing<br class=3D"">out of the valve cover cap vent =
hole.<br class=3D"">Tonight I ran a compression test and leakdown test. =
Cold engine results:<br class=3D""><br class=3D"">1 - 200 and =
2%<br class=3D"">2- 180 and 6%<br class=3D"">3 - 180 and 9%<br =
class=3D"">4 - 195 and 0%<br class=3D"">5 - 190 and 0%<br class=3D"">6 - =
185 and 0%<br class=3D""><br class=3D"">Note - I suspect my longacre =
leakdown gauge may not be reading quite right,<br class=3D"">as when i =
have the air side set to 100, the leakdown % on the last three is<br =
class=3D"">slightly below zero. So, perhaps the leakdown on the =
first three is higher.<br class=3D"">There was no excess oil until the =
last session. Oil pressure is about 50 hot at<br class=3D"">idle =
and 65 - 75 at speed, depending on RPM.<br class=3D"">EGT readings =
remained in the 1200 - 1250 range across three monitored<br =
class=3D"">cylinders at top speed What do i have - failing rings?<br =
class=3D"">Any diagnosis or tests you recommend before I start pulling =
the thing apart<br class=3D"">would be appreciated.<br class=3D""><br =
class=3D"">Triumphs racing - I=E2=80=99m sure I=E2=80=99m missing a few =
but this is who I remember.<br class=3D"">TR3 - John Hasty, Henry Frye, =
John Styduhar<br class=3D"">GT6 - me, Paul King, Jason Sukey, Jay De Pol =
until his diff case broke Spitfire -<br class=3D"">Russ Moore, Marty =
Sukey, Jeff Govert, Kent Bain, others<br class=3D"">Tr4 - Mark Wheatley, =
Allen Goode, I=E2=80=99m missing at least another one<br class=3D""><br =
class=3D"">Scott Janzen<br class=3D""></blockquote><br =
class=3D""></div></div></div><br class=3D""></body></html>=
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