Re: 3/8" to 1/2" OIL PICK-UP TUBE...AND BLOCK MOD?
[Re: Labratt]
#1218557
04/20/12 01:05 AM
04/20/12 01:05 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Thanks guys! Gus..what do you suggest doing with the dremmel? I didn't notice any casting flash on my Melling HV63 pump! Should something on the pump be opened-up? Thanks! Randy
I dont know if your pump has it Randy but where the 2 holes intersect on the bottom (below the rotor) there if usually a bad corner which can be radiused for better flow
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Re: 3/8" to 1/2" OIL PICK-UP TUBE...AND BLOCK MOD?
[Re: Labratt]
#1218559
04/20/12 07:31 AM
04/20/12 07:31 AM
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Joined: Feb 2005
Posts: 4,321 Prospect, PA
BSB67
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master
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Prospect, PA
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Quote:
Thanks guys! Gus..what do you suggest doing with the dremmel? I didn't notice any casting flash on my Melling HV63 pump! Should something on the pump be opened-up? Thanks! Randy
Is it a new pump? The last three Melling pumps that that I bought (they were the HP63) the cover and body of the pump were badly misaligned. Check the pressure side oil passage between the body and cover. On all three I had to enlarge the two small bolt holes in the cover then pinned it in the correct location. IIRC I also opened up that same oil passage in the cover to more closely match the oil passage diameter in the body. This was a few years ago, and in the HP pump, yours could be different.
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Re: 3/8" to 1/2" OIL PICK-UP TUBE...AND BLOCK MOD?
[Re: ZIPPY]
#1218561
04/20/12 11:20 AM
04/20/12 11:20 AM
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Joined: Jan 2003
Posts: 16,932 NC
440Jim
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I Live Here
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Posts: 16,932
NC
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Quote:
If by "block mod" you mean smoothing out the hard 90 degree turn the oil makes right after entering the block, I would say definitely do that. It is a 10 minute deal and costs nothing if you already have the tools.
I don't think increasing the oil pickup to 1/2 is necessary, but it does not do any harm unless the procedure is messed up. At that point it does a whole bunch of harm I would never do it to one that looked thin to begin with. So if there are any second thoughts, don't do it
1) Smooth the turn/intersection 2) Using a milling machine to do the 1/2 NPT is safer/better than by hand. It allows moving the centerline ~0.050" to keep more meat on the boss. 3) You can use a pickup with the 3/8 NPT thread welded to a larger tube for some of the 1/2 NPT benefit without enlarging the block boss.
FWIW, all my big blocks have the 1/2 NPT mod and the enlarged oil passages to the mains.
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Re: 3/8" to 1/2" OIL PICK-UP TUBE...AND BLOCK MOD?
[Re: Labratt]
#1218562
04/20/12 12:54 PM
04/20/12 12:54 PM
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Joined: Jan 2003
Posts: 17,915 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
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Posts: 17,915
S.E. Michigan
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Randy I forgot I posted this a long time ago, but here is an example of some of the work in the area you were asking about, both the pump and the block. It will help the oil flow slightly and costs nothing but some time, as long as you have the tools http://www.moparts.org/Tech/Archive/bb/51.htmlDefinitely have your guy doing the work (or yourself) ream out the passage between the galley and the mains too, to make the passage the same size all the way through it. A good reamer size to use is in Chuck Senatore's book. It's probably worth considering reaming the hole to #4 slightly larger than the rest, because the valvetrain robs that journal of oil......I don't know anyone who does that with every build, but it is something to think about.... Really don't think you "have to" do any of this... truthfully you could leave it alone but these kind of detailed changes are nice improvements to make and cheap insurance. My 400 is tapped to 1/2" NPTF and I did it myself at home, it is not horribly bad to do by hand if a person uses a tapered reamer before tapping the hole. Lacking the tapered reamer, the force required to turn the tap is much higher which creates a greater chance of breaking the iron.
Rich H.
Esse Quam Videri
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