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Old 03-01-2021, 06:22 AM   #26
hotdog
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Quote:
Originally Posted by a5m View Post
So what constitutes a 'long drive'? 30 minutes? I remember reading about short trips not being good for these engines and was concerned my 15 min drive wasn't enough. I guess so...
It's mostly an issue of temperature, not 'length'. In 15 minutes of normal driving, during the winter (as in stop and go, driving to the store type of thing) the motor oil will not be up to temperature. There is almost zero correlation between 'what the cute little temp needle says' and 'what the oil temperature actually is', and if you just take a normal, 15 minute drive, the temp gauge will 100% be 'in the middle', but your oil temperatures will be like... 140, 150. Which just isn't warm enough.

I have a loop I do if I don't drive all week; starts out nice and slow, gets it up a bit in temperature. Then a 'backwoods' route, where I can legit beat the **** out of it, then a return route, and some stop and go; the stop and go will legit let the oil temperatures rise more than a lot of the 'faster' stuff. I return home after ~25-30 minutes, and everything is nice and warmed up; oil temps 190+, etc etc.

If you don't have an oil temperature gauge, you're basically flying blind, but assume 20+ minutes of actual 'driving' to get the oil up to 190+.

This isn't a Subaru specific thing, either. All cars, from my wife's Mini Cooper S to my mother's boring Mazda 3, need to get up to temperature; charges the battery, burns off **** in the oil, etc etc. The EJ motor is not special.
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Old 03-01-2021, 08:57 AM   #27
rtv900
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Originally Posted by Mucho Maas View Post
The best place for me will be the simplest install, and I'm guessing that might be the oil gallery access port underneath the intercooler. .
Easiest would be a pan bolt with a temp sensor.
I have a 1950 vehicle with that set up.
Probably doesn't give the best reading being down in the pan with all that air passing over the pan, but it still comes up to temp as expected.

It would still give you a decent reading and no doubt easiest.

My sensor just came from the gauge company I used, which was Classic Instruments. Temp gauge, pan bolt, that's basically it. The bolt has a tiny electrical connection where you just put a ring terminal on it that goes to the gauge and the gauge needs 12v, done.
Probably the most annoying part is having to take off the wire for an oil change because I don't like twisting up the wire again and again.
Otherwise it's been working now for over 15 years trouble free.
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Old 03-01-2021, 09:02 PM   #28
Mucho Maas
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Quote:
Originally Posted by rtv900 View Post
Easiest would be a pan bolt with a temp sensor.
I have a 1950 vehicle with that set up.
Probably doesn't give the best reading being down in the pan with all that air passing over the pan, but it still comes up to temp as expected.

It would still give you a decent reading and no doubt easiest.

My sensor just came from the gauge company I used, which was Classic Instruments. Temp gauge, pan bolt, that's basically it. The bolt has a tiny electrical connection where you just put a ring terminal on it that goes to the gauge and the gauge needs 12v, done.
Probably the most annoying part is having to take off the wire for an oil change because I don't like twisting up the wire again and again.
Otherwise it's been working now for over 15 years trouble free.
Pan bolt would be my choice, but I can't bear to let go of the Fumoto drain valve. Poking around some more, I discovered sandwich plates, which go in-between the engine and oil filter and provide ports for sensors (or an oil cooler). Leaning in this direction at the moment. Simple install, pretty cheap, and haven't heard of problems, but maybe someone here has.
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Old 03-01-2021, 09:40 PM   #29
K3rm1tth3fr0g
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Quote:
Originally Posted by Mucho Maas View Post
Pan bolt would be my choice, but I can't bear to let go of the Fumoto drain valve. Poking around some more, I discovered sandwich plates, which go in-between the engine and oil filter and provide ports for sensors (or an oil cooler). Leaning in this direction at the moment. Simple install, pretty cheap, and haven't heard of problems, but maybe someone here has.



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Old 03-03-2021, 12:02 AM   #30
a5m
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Quote:
Originally Posted by hotdog View Post
It's mostly an issue of temperature, not 'length'. In 15 minutes of normal driving, during the winter (as in stop and go, driving to the store type of thing) the motor oil will not be up to temperature. There is almost zero correlation between 'what the cute little temp needle says' and 'what the oil temperature actually is', and if you just take a normal, 15 minute drive, the temp gauge will 100% be 'in the middle', but your oil temperatures will be like... 140, 150. Which just isn't warm enough.

I have a loop I do if I don't drive all week; starts out nice and slow, gets it up a bit in temperature. Then a 'backwoods' route, where I can legit beat the **** out of it, then a return route, and some stop and go; the stop and go will legit let the oil temperatures rise more than a lot of the 'faster' stuff. I return home after ~25-30 minutes, and everything is nice and warmed up; oil temps 190+, etc etc.

If you don't have an oil temperature gauge, you're basically flying blind, but assume 20+ minutes of actual 'driving' to get the oil up to 190+.

This isn't a Subaru specific thing, either. All cars, from my wife's Mini Cooper S to my mother's boring Mazda 3, need to get up to temperature; charges the battery, burns off **** in the oil, etc etc. The EJ motor is not special.
Thanks for the explanation. I get it. I should look into installing an oil temp gauge. Probably more important than a boost gauge honestly.

I had a short drive today that was just barely 20 mins. Late at night so not much traffic but still lots of stop and go. Was getting on her a bit to warm things up. Not sure if that even helps vs driving like a grandma. I guess as long as some longer drives are thrown in the mix throughout the week it should be fine?
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Old 03-06-2021, 09:33 AM   #31
Mucho Maas
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In case someone missed this thread's bottom line - the consensus is unequivocally YES, it is a bad idea to block off my hood scoop in cold weather. And presumably any weather.

Instead, I should avoid short trips, which don't allow the engine oil to get hot enough to get rid of the water in the blowby. Sounds like the AOS didn't so much cause my issue as contributed to it.

I've already extended my commute, and ordered a block heater, sandwich plate, oil temp and oil pressure gauges.

Oh, and discovered this gauge faq late in my process - https://forums.nasioc.com/forums/sho....php?t=1193843
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