Oil pick up openings depend on what?

[fullmetaljacket]

Is there a reason for an oyster type oil pick up opening as apposed to a boxed opening like the one below in the second image?
It seems the stock oyster type has very small reservoir provisions to hold oil? Am I correct?

Does the shape depend on the types of baffles/trap doors that the oil pan itself has?
It looks to me that the netted inlet openings on both styles are more or less the same. Just wondering about the extra material for the oyster style.

 

[R/T Boy 67]

The stock pickup is designed to sit tightly on the bottom of the pan.

 

[1danc]

it would be size of space in your pan sump - like you noted , if the pan is baffled or room for doors to swing

 

[fullmetaljacket]

it would be size of space in your pan sump - like you noted , if the pan is baffled or room for doors to swing

Gotcha.
Yes. My new pan is windage baffled up top like any other 971 pan, but has a reservoir and trap door near the bottom of the sump.

 

[not so famous bob]

The stock pickup is designed to sit tightly on the bottom of the pan.

I keep hearing people say this ^^^^^ , but Tom Hoover , of Chrysler hemi fame , told us at a Chrysler seminar to run them 1/4 to 3/8'' off the bottom of the pan , and 3/8'' was perfect ......jfyi ..

 

[BSB67]

It’s not complicated. They are both designed to do the same thing - suck oil without drawing in air. Just different designs. The factory unit can touch the pan, obviously the other cannot.

 

[fullmetaljacket]

It’s not complicated. They are both designed to do the same thing - suck oil without drawing in air. Just different designs. The factory unit can touch the pan, obviously the other cannot.

Yes, I see that that protruding hump or whatever it's called at the bottom of the stock pick up is there to gauge the distance from the sump floor to the inlet. it looks to be anywhere between 1/4" to 3/8" of an elevation.

I guess the second design will take a little more time in adjustment to make sure it is at the correct height off the bottom.

 

[Geoff 2]

The mesh on the sytock p/up has very small holes. It has to be a certain minimum diam so as to not cause a flow restriction.
The aftermarket p/up has larger holes & can be a smaller area; down side is a lot of trash can get past the big holes....

 

[fullmetaljacket]

The mesh on the sytock p/up has very small holes. It has to be a certain minimum diam so as to not cause a flow restriction.
The aftermarket p/up has larger holes & can be a smaller area; down side is a lot of trash can get past the big holes....

These two meshes on this stock oyster P/up and aftermarket P/up look almost the same diameter to my eye. I could be wrong.

 

[Geoff 2]

Cannot see the mesh of the stock p/up, going from experience. Some aftermarket p/ups have coarser mesh than in the pic. I always use a stock p/up buuuuut after modifying it for better flow.

 

[charger greg]

I keep hearing people say this ^^^^^ , but Tom Hoover , of Chrysler hemi fame , told us at a Chrysler seminar to run them 1/4 to 3/8'' off the bottom of the pan , and 3/8'' was perfect ......jfyi ..

I used to run my oil pick up [stock type] just off the bottom of the oil pan until I had a pick up break off at the thread base of the pick up. The pick up needs to touch the bottom of the pan or be supported, vibration can cause fatigue in the weak portion in the threads and the pick up can break off. In the service manual even with the hemi, it instructs "the pick up must touch the oil pan" . I set mine up that way now and never broke another one.