I agree with what was said earlier.
By putting an engine temp gauge in you got an answer to a question you never
had. Oil temps are only pertinent when you are running big RPMs and speeds
over long times like open road racing (ORR). I can also tell you that
installing an oil cooler for normal driving with occasional spirited auto
crossing will have little to no effect on overall temps. Oil coolers just
do not remove that much heat under those conditions. Although depending on
where they are mounted can look cool.
I also wondered why changing the viscosity of oil made hot starting easier.
I think you may want to check timing, A/F mixture and electrical
connections. Viscosity of hot 30 weight and hot 40 weight would not be
noticeable during starting in my opinion. I doubt oil temps would be
significantly different between viscosities. I also know that you will
NEVER get your oil temps in the same neighborhood as your water temp. Heck
I know of a number of people that would love to have their water temps at
210, let alone their oil temps.
Remember, this opinion was free.
Lynn
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Jerry & Maureen (Mo)
Sent: Monday, September 28, 2009 11:10 AM
To: owain.lloyd@gmail.com; tigers@autox.team.net
Subject: Re: [Tigers] oil temperature
Owain,
It's not unusual for the oil temp to run higher than the coolant temp. I
wouldn't worry about it. If you go to a 190 thermostat the oil temp will
likely also go up also, again I wouldn't worry about it. It's always been
higher, it's just now you're seeing the actual temp for the first time.
What I'm trying to figure out is why changing to "lighter oil" made the
engine start easer when hot, because with the weights you mentioned (5w30/
10w/40) the viscosity difference between hot 30wt. and hot 40wt. is so small
I can't imagine that to be the problem why the engine doesn't fire.
I know with my car I have a fairly hot ignition system, but when the engine
is hot and I step on the gas pedal even one time before trying to start it
will turn over quite a few times before starting. If I don't "pump it" the
engine will start immediately. It's amazing how just that one squirt of the
accelerator pump will give a mixture that is way too rich for starting hot.
I guess it is kind of a habit to "pump it" before starting. (Works great
when cold of course).
Try it and see if that works.
Jerry Christopherson
19 days to go to the "Big Texas TAC Session" ;)
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Owain Lloyd
Sent: Sunday, September 27, 2009 5:17 PM
To: tigers@autox.team.net
Subject: [Tigers] oil temperature
i just installed an oil temperature gauge and found that after a hard run
the water temperature is about 180F (the thermostat temp - i need to change
that up to a 190), but the oil temperature reaches about 260!
what is the normal acceptable temperature for engine oil? i'm trying to
decide whether or not to fit an oil cooler. i'd be happier if the temp was
under 210 but thats not based on any particular knowledge! i'm using mobil
semi synthetic if that affects the acceptable extremes.
on a side note, i recently changed to lighter oil (mobil 5W30 instead on
10w40) after finding hot cranking difficult to impossible. this fixed the
hot cranking issue, but i guess i could switch back to 10w40 if the oil was
running cooler?
thanks again for wisdom of the list!
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