The cold/hot fluctuation COULD be due to the higher viscosity cold oil causing the gauge reading to be a bit lazy?
Glen
ps- the POS Sprite got 3 out of 4 good sessions in. She set her best time ever in morning race. Strapped her in for race #2, fired it up... ooops.
Apparently unbeknownst to both her & her crew... (oooh)... the exhaust collector had become "disassembled from the racecar" at the end of the previous race, and was nowhere to be found...
--Previous Message--
: Related questions and ponderings....
:
: As mentioned previously I have not had
: much time to spend with the Spitfire
: this weekend. However, during the week
: I found time to install the new
: (non-thermostatic) oil cooler sandwich
: plate, new oil filter, and the 160
: degree thermostat. Late this
: afternoon, After building oil pressure
: I started the engine and saw changes,
: some of which were expected, some of
: which were not.
:
: It's colder today with a temperature
: around 50 degrees. When I started the
: cold engine, the oil pressure climbed
: slowly, not quickly like it had before.
: The pressure reached 50 PSI with the
: engine idling cold at 1000 RPM but
: would not jump above that when the
: throttle was blipped. I let the engine
: idle for about 20 to 30 minutes after
: which the pressure had dropped to about
: 42 PSI (same idle speed) and WOULD
: increase when the throttle was
: blipped... including going over the 50
: PSI mark. I am confused by this. If
: the relief valve is opening properly,
: shouldn't the cold and hot upper oil
: pressure limit be (about) the same? If
: I was limited to 50 PSI with cold oil,
: why would the warmed oil be able to
: reach a higher pressure than cold oil?
: That's the part I don't understand.
:
: What I was expecting was the increased
: oil pressure with the lower ambient
: temperature, colder thermostat, and a
: plumbed oil cooler. Hopefully I will
: receive the new relief valve parts this
: week and will find time to install
: them. However, the time change is
: going to make that awkward.
: Regardless, hopefully the weather will
: be good next weekend so I can take the
: car to run errands and see how the
: engine does under normal conditions,
: not idling.
:
: Doug L.
:
:
: --Previous Message--
: With cold oil I would expect it to be
: bumping the relief valve @ 2500-3000
: rpm, and drop as the oil gets to temp.
:
:
Responses