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.

 

[fullmetaljacket]

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.

Hhhhmmmmm..........interesting. I totally see your point.
My car vibrates enough to be on a richer scale reading. LOL.

 

[#41]

Considering how many cars I have seen with the bottom of oil pan pushed in, the factory engineers had their thinking caps on when they designed the stock pickup.

 

[BSB67]

What I really like about the stock pick-up is that it is a great place to store valve stem seals.

 

[Jeff Peterson]

What I really like about the stock pick-up is that it is a great place to store valve stem seals.

And cam gear plastic..

 

[fullmetaljacket]

And cam gear plastic..

Sarcasm aside, are you guys saying that the stock pick up's oyster shell harbors residual matter from the engine?

 

[not so famous bob]

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.

I never broke one either , set it up with 3/8'' clearance just like Tom Hoover said , raced for 14 yrs. that way , and as far as I know the guy that owns it has never changed it .
He said the stock hemi pump would pump a qt a second at drag racing rpm on the pan floor had created a vortec that gave a lot of racers oil starvation before they figured it out .
I have my swinging pick up at a hair over 3/8'' in a 9 qt pan , w/ 7 1/2 qts In it = works for me ...

 

[not so famous bob]

Considering how many cars I have seen with the bottom of oil pan pushed in, the factory engineers had their thinking caps on when they designed the stock pickup.

probly responsible for a lot of broken block threads too...

 

[RemCharger]

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 never broke one either , set it up with 3/8'' clearance just like Tom Hoover said , raced for 14 yrs. that way , and as far as I know the guy that owns it has never changed it .
He said the stock hemi pump would pump a qt a second at drag racing rpm on the pan floor had created a vortec that gave a lot of racers oil starvation before they figured it out .
I have my swinging pick up at a hair over 3/8'' in a 9 qt pan , w/ 7 1/2 qts In it = works for me ...

Yup^^^^

probly responsible for a lot of broken block threads too...

Raised pickup serves 2 purposes; pan crunches in, doesn't crack the pickup at the threads, but more importantly doesn't starve the pump at high rpm. Pickup touching the pan is a nogoodsky

 

[fullmetaljacket]

^^^^

Yup^^^^

Raised pickup serves 2 purposes; pan crunches in, doesn't crack the pickup at the threads, but more importantly doesn't starve the pump at high rpm. Pickup touching the pan is a nogoodsky

This is a rather interestingly internal conversation. Glad I brought it up along with Mr. Hoover. The details can either wreck havoc or bread and hammock.