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Old 04-29-2013, 10:24 PM   #1
philikon
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Default Oil temp in third oil galley plug?

So I installed an oil pressure sender in place of the oil galley plug on top of the motor, next to the PCV outlet. I noticed there's another plug on the other crankcase half, between the alternator bracket and the coolant crossover pipe. Does that also lead to an oil galley? If so, I'm thinking of installing an oil temp sender there.
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Old 04-30-2013, 12:48 AM   #2
rhino6303
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Not a good place for oil temp. To get an accurate reading the sender needs to be in a place where oil flows.
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Old 04-30-2013, 01:20 AM   #3
philikon
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So it's an oil galley plug then?

I see your point about oil flowing. I guess it's too high to be in the oil stream. Where would you suggest?
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Old 04-30-2013, 02:03 AM   #4
Zefy
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oil temp sensor in the pan is best. I think killer b makes an adaptor to fit a sensor into the drain plug.
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Old 04-30-2013, 02:33 AM   #5
philikon
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Is there really that much more flow in the pan, though? Seems like the oil in the sump would be pretty slow to respond to increases in oil temperature.

I'm running a modified pan that has a smaller, non-OEM drain plug, so I'll have to think of something else. Maybe weld on a 1/8" NPT bung.

What about the two plugs on the bottom of the oil pump? Specifically the one on the high pressure side. Has anybody ever tapped those for oil temp?
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Old 04-30-2013, 06:43 AM   #6
KillerBMotorsport
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Quote:
Originally Posted by Zefy View Post
oil temp sensor in the pan is best. I think killer b makes an adaptor to fit a sensor into the drain plug.
Correct

Quote:
Originally Posted by philikon View Post
Is there really that much more flow in the pan, though? Seems like the oil in the sump would be pretty slow to respond to increases in oil temperature.

I'm running a modified pan that has a smaller, non-OEM drain plug, so I'll have to think of something else. Maybe weld on a 1/8" NPT bung.

What about the two plugs on the bottom of the oil pump? Specifically the one on the high pressure side. Has anybody ever tapped those for oil temp?
The pan is the ideal spot for temp because this it shows the temp of the oil going INTO the engine. There is LOTS of flow there, the oil is being exchanged many times per minute.

Drill and tap a hole right into the center of the plug you've got. This is much easier than adding a bung to the pan.
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Old 04-30-2013, 07:50 AM   #7
Patrick Olsen
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Quote:
Originally Posted by rhino6303 View Post
Not a good place for oil temp. To get an accurate reading the sender needs to be in a place where oil flows.
The oil galley is basically a pipeline inside the head through which oil flows.

I think the sending unit in the drain plug is a pain in the ass. A shop relocated my sending unit from the oil galley to the drain plug, and I moved it back first chance I got.
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Old 04-30-2013, 10:14 AM   #8
KillerBMotorsport
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I think the sending unit in the drain plug is a pain in the ass.
Why?

It helps prevent burns and the plug/washer from falling into the drain bucket
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Old 05-01-2013, 06:35 PM   #9
philikon
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Originally Posted by KillerBMotorsport View Post
Drill and tap a hole right into the center of the plug you've got. This is much easier than adding a bung to the pan.
Ordinarily I'd say you're right, but sadly I think the plug is too small. I think it's an M10 or something small like that. I ordered a weld-on bung. That's going to much simpler to deal with than, say, re-tapping the hole to a bigger size or something like that.
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Old 05-02-2013, 08:25 AM   #10
Patrick Olsen
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Quote:
Originally Posted by KillerBMotorsport View Post
Quote:
Originally Posted by Patrick Olsen
I think the sending unit in the drain plug is a pain in the ass.
Why?
If the wiring harness plugged right into the sending unit, such that one could easily disconnect it, I probably wouldn't mind. But I have a DEFI gauge setup, and the sending unit has a long pigtail on it, and the connection to the wiring harness ends up being in a spot that's difficult to reach from above (before lifting the car to change the oil) and completely inaccessible from below (once the car is up to change the oil).

I gain absolutely nothing by having the sending unit in the drain plug, so I'd rather just have it in one of the oil gallery plugs where it's out of the way of everything and gives a reading of the oil being supplied to the bearings.

Pat
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