<!--quoteo(post=22334:date=Mon 20th Nov 2006, 12:30 PM:name=GuyGraham)-->QUOTE(GuyGraham @ Mon 20th Nov 2006, 12:30 PM) <{POST_SNAPBACK}><!--quotec-->where the oil pressure sender is screwed into, is just the return gallery from the used oil from the cams
It falls back down to the bottom of the engine by gravity, ready to tbe pumped to the tank
You are not measuring oil pressure here.<!--QuoteEnd--><!--QuoteEEnd-->
In the 900 WSM you can see that that bolt is definitely at the end of the high pressure oil gallery that feeds the front camshaft bearings. So it does carry high pressure oil.
<!--quoteo(post=22390:date=Mon 20th Nov 2006, 09:08 PM:name=dandywarhol)-->QUOTE(dandywarhol @ Mon 20th Nov 2006, 09:08 PM) <{POST_SNAPBACK}><!--quotec-->Maybe it's reading engine breather pressure![[Image: blink.gif]](http://www.carpe-tdm.net/ipb/style_emoticons/<#EMO_DIR#>/blink.gif)
Gee gee is right about that point on the head though.........you open that to see if oil is circulating and the pressure there is minimal if it exists at all<!--QuoteEnd--><!--QuoteEEnd-->
Agreed, oil just trickles out. But the reason is (probably) that the oil passes through a restrictor (a tiny hole to you and me), which reduces the pressure as oil flows through it. If you reduce the flow rate to zero by blocking the hole on the outside of the engine then the pressure will build up to be the same as in the oil gallery.
The problem of using an oil pressure guage at this point is that the restrictor will probably slow down the action of the pressure guage to an unacceptable degree.
It falls back down to the bottom of the engine by gravity, ready to tbe pumped to the tank
You are not measuring oil pressure here.<!--QuoteEnd--><!--QuoteEEnd-->
In the 900 WSM you can see that that bolt is definitely at the end of the high pressure oil gallery that feeds the front camshaft bearings. So it does carry high pressure oil.
<!--quoteo(post=22390:date=Mon 20th Nov 2006, 09:08 PM:name=dandywarhol)-->QUOTE(dandywarhol @ Mon 20th Nov 2006, 09:08 PM) <{POST_SNAPBACK}><!--quotec-->Maybe it's reading engine breather pressure
Gee gee is right about that point on the head though.........you open that to see if oil is circulating and the pressure there is minimal if it exists at all<!--QuoteEnd--><!--QuoteEEnd-->
Agreed, oil just trickles out. But the reason is (probably) that the oil passes through a restrictor (a tiny hole to you and me), which reduces the pressure as oil flows through it. If you reduce the flow rate to zero by blocking the hole on the outside of the engine then the pressure will build up to be the same as in the oil gallery.
The problem of using an oil pressure guage at this point is that the restrictor will probably slow down the action of the pressure guage to an unacceptable degree.