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SB Oil Pump's ?


I started this Post so we can talk about some Oil Pump Tech . Here are some Photos I took of a Stock G.M SB Pump and the Early HV Melling SB Pump that had the Stronger Casting Like the Select Pumps they sell today .


005.jpg picture by HOTRODHOUSE


007-2.jpg picture by HOTRODHOUSE

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SB Chevy Tech

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The "new"  M55HV pumps from Melling are dangerous to run in a HP engine.  I only run the Select pumps now since the early pumps are just about impossible to find.   Here is some pics of what can and will happen with the thin castings.


MellingOilpumpbrokeM55AStandarde-ma.jpg?t=1261381970



MellingM55AStandarde-mailview.jpg?t=1261382082


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Ray
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SB Chevy Tech

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Also,   This is a copy of the warning that comes in the box with most of the new pumps.  They know it's a bad design but still sell itdisbelief

 

MellingWarningStandarde-mailview.jpg?t=1261382976



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Look who else Re-Boxes these Oil Pump's ?

attachment.php?attachmentid=244243&d=1163900803


attachment.php?attachmentid=244242&d=1163900803


Here is the typical H55 housing next to a "select" housing


attachment.php?attachmentid=244244&d=1163901419


attachment.php?attachmentid=244245&d=1163901419


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This also Looks Like a Good Oil Pump to run .

http://www.milodon.com/oil-system/oil-pumps.asp

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This post has me worried on what brand oil pump to buy for my 350 build .

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Go with this Milodon Brand Oil Pump .

http://www.competitionproducts.com/Milodon-Oil-Pump-Chev-SB-283-327-350-400-5_8-Inlet/productinfo/18750/

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Just out of curiousity Tango, What would be the downside of running the standard Volume Big Block oil pump? I had a buddy of mine run one on a small block before and he told me that it could suck the oil pan dry cause of high volume, thats why he used a deep pan. any thoughts on this? thanks

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The BB Oil Pumps have Larger cast housings with Larger Gears with more Teeth . So they will in fact operate more smoothly and be a High Volume Pump when installed in a SB Chevy . The BB Pump also will have more drag then a Performance SB Pump will . And it will not Clear the Crank Throws with out modification to it's Housing . Basically it's over Kill even on a Full Race SB Chevy . A good Brand Name Racing anti-chatter-cavitation SB Oil Pump is adequate to support Very High H.P SB Chevy Build's .



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Ok I have a Few more photos . The Pump on the Left is a older heavy casting Melling M-55HV next on the Right a Milodon High Volume / High Pressure Pump . Milodon uses there own Castings that are nice and strong . Dollar for Dollar I don't know of a better Pump to run .

 

 

 



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Wasnt there some huge debocle about weather or not the select pumps have billet gears or not? Ive seen plenty of threads on those failing as well. I went with the 10550 on mine.

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I am stuck a bit in the past still with Oil Pumps . Because Years ago we had Like two Oil Pumps the stock G.M and the G.M Z/28 Pump that is a Stock Pump with a High Pressure spring in it . Or Back then we bought a High Pressure spring MR Gasket Brand and installed it or install a washer in with the stock Pump to bump the PSI's . I know what your thinking ' Tango this is not then what is your Point ? My point is this the stock castings were not breaking or Failing and were spun much higher then most these Box Engines of today . I would guess and say that today that Z/28 style Pump is still the most sold SB Chevy Oil Pump . I do think most of them pumps were Damaged by Folks driving on the Pick up tube in an improper way and cracking the casting . As for billet Gears ? the gears should be hardened and there should be no lack of oil there so if made and clearanced right at the factory there should be no Problems with non-Billet gears on a SB Pump .

Next is the argument Volume or Pressure or both . Guy will say stock PSI of 45-50 PSI is fine just need more Volume . Could be on an Engine that is just rebuilt with tight Clearances . I still Like the high PSI Pump sometime in High Volume other times not . Now this is only My thought's but I am basing them on years of Engines I put together and Friend built that I have seen run the test of Time . When your stuck in traffic idling on a warm day that's when that High Pressure pump is worth it's weight in Gold .



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That old Melling M-55HV above is out of an Engine that turned it about 80K miles . It's still good and I am planing to reuse it on a 350 that I am going to build next



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Tim-bo Here is the info on your Melling 10550 Pump High Volume stock Pressure . Looks Like a strong casting .

 

mel-10550_w.jpg  689-10550_4.jpg 689-10550_6.jpg

 

Tech Notes:

  • Oil Pump Style: Wet sump
  • Oil Pump Volume: High-volume
  • Oil Pump Pressure: Standard pressure
  • High Pressure Oil Pump Spring Included: No
  • Pickup Included: No
  • Pickup Inlet Diameter: 0.625 in.
  • Hardened Drive Shaft Recommended: Yes
  • Oil Pump Driveshaft Included: Yes
  • Dry Sump Pulley Included: No
  • Dry Sump Belt Included: No
  • Dry Sump Mounting Brackets Included: No
  • Hardware Included: No
  • Gaskets Included: No
  • Quantity: Sold individually.
  • Notes: Approximately 25 percent over stock volume.


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Yup, that would be the one.

The deal with the gears, It was one of the bigger oil pump failure threads over on speedtalk. There was a few pictures of the gears cracking in half, and that was the select pumps. so the guys analized them and found out they were just the PM gears like the melling standard pumps when they were advertized to be billet.

Also, with all this failure with the pumps, if i recall correctly, it was in 2002-2004 or something, they had a casting change for all their 55 series pumps. this included the z-28 pump. That was what i was originally was planning on getting till i read that pump failure thread. Flynn had that z28 pump in his 355 build, so we dug up some reciepts, and found he bought it back in 01, so we just assumed thats why it hadnt broken. he was running 7+k rpms many times. Who knows for sure though.

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The Melling #M55A is the DZ-302 Z/28 Pump Yes it is a narrow Neck Light casting Stock pump with Stock Gears with a Higher Pressure relief Spring . The pump in the 1st Photo is that GM Narrow neck casting . I dis-assembled it checked the gears and casting installed the MR Gasket High PSI Spring and it's also going to be re-used . Think of all the Chevy car's and Trucks you see every day center cam V8's and V6's that have that same Pump with tons of Miles on them . There good I have seen Pumps that seized some Hi Perf one From when I took off the Cover you could see the marks in the gears were some trash went through them or Lack of oil or Dirty oil . Many Times the truth on what also Led up to it's short Lived service is not disclosed . But yes if a New Pump's Clearance is not right it will fail as well . Also there very well could have been some weak casted Pump that were in fact Boxed up . As a Hot Rodder one would hope that is not the case .

 

Melling #M55A High Pressure Z/28 Narrow Cast Neck Oil Pump

 

689-M55A.jpg



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