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#2440745 - 01/25/18 07:06 PM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: Cab_Burge]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19697
Loc: Rio Linda, CA
Originally Posted By Cab_Burge
Are you a machinest? I'm not


If you can't eyeball the edge distance of the existing hole and tell if it's a candidate for increasing the bore...

All my blocks are drilled with a hand-held drill and the correct tap, even the mundane daily driver blocks. I drill 'em all the way to the intersection and then use a rotary burr to smooth out the sharp corner. (easier with the larger hole)

I figure I gotta get a new pickup anyway and the 1/2" price isn't that bad when included in a complete overhaul.


Attachments
Half inch PU.jpg


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#2441251 - 01/26/18 08:16 PM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: John_Kunkel]
B5 Bee Offline
master

Registered: 02/28/03
Posts: 8020
Loc: Pangaea
Originally Posted By John_Kunkel
Originally Posted By Cab_Burge
Are you a machinest? I'm not


If you can't eyeball the edge distance of the existing hole and tell if it's a candidate for increasing the bore...

All my blocks are drilled with a hand-held drill and the correct tap, even the mundane daily driver blocks. I drill 'em all the way to the intersection and then use a rotary burr to smooth out the sharp corner. (easier with the larger hole)

I figure I gotta get a new pickup anyway and the 1/2" price isn't that bad when included in a complete overhaul.



I do it the same way,
except I first use a die grinder to remove the threads 180* opposite the thin side. This moves the drill center point over, leaving more material at the thin area and reducing the chance of cracking.
Another advantage with 1/2", it takes less power to turn the pump.

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#2441371 - 01/26/18 11:58 PM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: Charger446]
cudaman1969 Offline
master

Registered: 01/25/04
Posts: 4538
Loc: fredericksburg,va
I did my 440 the same way, back in 85, a lot of passes at the track. I might finally pull the pan this spring just to look.
If you think the big blocks are to small, check out a small block pipe. I made a new one up for the 340 from the 3.0 Mitsubishi engine (a full 1" ) attached off the cover into the rear sump Magnum pan. Has that nice bell on the bottom too.

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#2441428 - 01/27/18 09:09 AM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: cudaman1969]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34162
Loc: Lincoln Nebraska
Quote:
I made a new one up for the 340 from the 3.0 Mitsubishi engine (a full 1" ) attached off the cover into the rear sump Magnum pan. Has that nice bell on the bottom too.
Mike would you have a pic (or a part # to search for a pic)? EDIT found one on eBay, that would be a nice piece & an easy mod especially if you have a rear sump pan.


Edited by RapidRobert (01/27/18 09:16 AM)
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#2441565 - 01/27/18 01:25 PM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: RapidRobert]
cudaman1969 Offline
master

Registered: 01/25/04
Posts: 4538
Loc: fredericksburg,va
Originally Posted By RapidRobert
Quote:
I made a new one up for the 340 from the 3.0 Mitsubishi engine (a full 1" ) attached off the cover into the rear sump Magnum pan. Has that nice bell on the bottom too.
Mike would you have a pic (or a part # to search for a pic)? EDIT found one on eBay, that would be a nice piece & an easy mod especially if you have a rear sump pan.

I had to section, shorten, then tig it back to get it in the right direction, like making a header. If you still need a pic i'll send you a pm to show how it came out.

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#2441701 - 01/27/18 05:38 PM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: B5 Bee]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19697
Loc: Rio Linda, CA
Originally Posted By B5 Bee

I do it the same way,
except I first use a die grinder to remove the threads 180* opposite the thin side. This moves the drill center point over, leaving more material at the thin area and reducing the chance of cracking.


When I've tried moving the hole outboard the pickup pipe hits the pan side wall....have to dimple it. Might depend on who makes the pan.
_________________________
I'm supposed to respect my elders, but its getting harder and harder for me to find one now.

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#2448355 - 02/08/18 01:58 AM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: Charger446]
Alchemi Offline


Registered: 02/24/14
Posts: 171
Loc: Brisvegas, Australia
So at a given RPM the oil pump will pump "x" volume of fluid
The 2 sizes of tubes have a different volume
The smaller sized tube would fill up faster and therefore recover from being "empty" quicker

There possibly would be a very small HP difference (1/2, 1hp?)that I doubt anyone on here could accurately measure as the bigger tube is easier to pull through

At some stage the small sized one would not keep up with a high volume pump and or rpm's, very much dependant on the bearing clearances and top end oiling system used

Its often said on here that our oil pumps are bypassing the regulator most of the time anyway

Simple enough, How long is a piece of string?

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#2448364 - 02/08/18 03:55 AM Re: 3/8 vs 1/2 inch oil pickup. Do I even need 1/2? [Re: Charger446]
451Mopar Offline
master

Registered: 05/19/08
Posts: 4995
Loc: Aurora, Colorado
Question? At what point should a larger pickup tube be used?
Also, how much of a restriction is the hole in the oil pump?
I guess this leads to, how much better is an external line connected to the pump cover?

FWIW, both of my 400 and 440 stroker engines have 1/2" pickups. I'm just curious if they are really needed? My Jensen project 440 stroker (505") should be about 600 HP, and I have not decided which size pickup to use?
I picked up one of the 440 Source oil pumps (on closeout sale) that have the connections for the remote oil filter, and also an inlet for external oiling. I am thinking of plugging the external inlet so it will pull from the block pickup as normal. I really just wanted the remote filter fittings as that is how the Jensen is configured originally and I'm not sure what condition the original pump is in.

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