Oil squirter function question

[Guest]

Does anyone know how it functions? I just removed one from my block and attempted to test it with air pressure to find out what oil pressure it activates at and could barely get any flow through it with 115 psi. I suspect it may be temperature activated.

[geoffinbc]

Well your going to have a max of say 70PSI when the oil is cold. So it must work on less pressure than that. It may only have a fine jet that comes out. It cannot flood the cylinder walls or you may get excess oil past the lower oil control rings.

[bszopi]

From a GM press release for the 2006 2.8L DOHC...

Finally, the V-6 VVT engine family was developed with pressure-actuated oil squirters in
all applications. Three jet assemblies in the block each hold a pair of oil-squirting jets
that drench the underside of each piston and the surrounding cylinder wall with an extra
layer of cooling, friction-reducing oil. The jets are activated when oil pressure reaches a
prescribed level. They reduce piston temperature, which in turn allows the engine to
produce more power without reducing long-term durability. Moreover, the extra layer of
oil on the cylinder walls and piston wrist pin further dampens noise emanating from the
pistons, meaning quieter operation.

So its definitely pressure... How much is still unknown.

[Joseph Upson]

From a GM press release for the 2006 2.8L DOHC...



So its definitely pressure... How much is still unknown.

That doesn't rule out a heat lock, especially comming from GM who only tells you what they want you to know. It can't be 115 psi because the oil pressure doesn't go up that high, so something is preventing this particular unit from working at that pressure.

I'll soak it in some mineral spirits and penetrating oil to make sure it's not binding up and try it again.