Oil Pump High Pressure or High Volume ?

[Nassau1969]

Oil Pump-- High Pressure or High Volume, Little over stock 440 w/10:5:1 s

[Chatt69chgr]

I think std pump will be OK for your application instead of using the HP or HV units.  Available from Autozone as I recall for $36.95 and is a new Melling.  Advance will match price.  There is a lot of discussion on this that has appeared on this forum.  The high volume will suck the pan dry so you need to make sure you use a higher capacity oil pan.  Many like the 6 Qt hemi pan since with filter you have 7 qts and the pan doesn't hang down below the k frame so isn't damaged so easily.  Also, you may have a clearance issue with the steering box with the higher volume/capacity pump.  Might want to use the search feature to access the previous discussions.  Seems like the HP/HV pump takes more HP too.  The issue of high pressure or high volume was part of these previous discussions. 

[RD]

i used a HV oil pump with stock pan on my 400 that I had in my ramcharger.  kept good pressure 80psi (w/20-50 oil) in acceleration and deceleration without any hint of oil scavenging.  HV oil pump is exactly the same housing as a regular pump.. its the internals that are different.  same goes for a HP pump.

[b5blue]

With ether HV or HP you need the upgraded pump drive rod. I used a Melling HV pump and have no issues. HP just has a stiffer spring I'm told.   

[Chatt69chgr]

If I'm not mistaken the HV pump is a little larger than the std one and uses longer bolts to attach to the block.  This used to be explained on the 440 Source website but I was not able to find the info on their new website.  The HP pump may be the same size as the std but use a different spring internally.

[RD]

HV pump is the same size as the reg pump.  I used the same OE bolts on the HV pump that fastened the OE pump.  They really are the same size.  Now, I am talking about melling oil pumps... you may be referring to a different brand?  not sure.

[BSB67]

HV pump is the same size as the reg pump.  I used the same OE bolts on the HV pump that fastened the OE pump.  They really are the same size.  Now, I am talking about melling oil pumps... you may be referring to a different brand?  not sure.

The rotor on the Melling HV pump is longer than the standard pump. 

[RD]

HV pump is the same size as the reg pump.  I used the same OE bolts on the HV pump that fastened the OE pump.  They really are the same size.  Now, I am talking about melling oil pumps... you may be referring to a different brand?  not sure.

The rotor on the Melling HV pump is longer than the standard pump. 

because i am always a student.. does that make a difference in housing size?  I have not compared the two next to each other, but can if needed.

[oldcarnut]

With ether HV or HP you need the upgraded pump drive rod. I used a Melling HV pump and have no issues. HP just has a stiffer spring I'm told.   

Had a 69 Bee that had a HV pump in it and I snapped the shaft in two from an accidental sudden rev up in park.  The other cars that had a HV pump I always had to run extra oil because of pumping so much up top.

[Nacho-RT74]

sorry RD I have to be a little bit dissagree... I think HV pumps are a little bit wider/thicker than standart, That gives more volumen on cavities, to drive more volume on every oil push.

just a little bit thicker. Stock bolts still works. They are long enough

HP are just spring modification

[firefighter3931]

I'm a firm believer in lots of oil pressure for a street driven car. With a stock oilpan the std volume high pressure pump is a good choice. If you opt for a 6qt hemi pan then the HV pump is the way to go. 

sorry RD I have to be a little bit dissagree... I think HV pumps are a little bit wider/thicker than standart, That gives more volumen on cavities, to drive more volume on every oil push.

just a little bit thicker. Stock bolts still works. They are long enough

HP are just spring modification

Natcho is correct....the HV pump is slightly thicker than the std pump, but not by much.



Ron

[RD]

thanks guys!  appreciate the lesson.

[Nassau1969]

OK if I change the pan to the Hemi one, I guess I have to change the oil pick up.

[RD]

OK if I change the pan to the Hemi one, I guess I have to change the oil pick up.

make sure you get the right size of pickup.  hemi pickup's were 1/2" and 440's were 3/8".  If you dont have a hemi, then you have the 3/8" pickup.

[Nassau1969]

Is the 402 oil pan a 6 qrt pan. If so I'll just swap them.

[Nassau1969]

The 402 is a 5qrt pan I just looked it up, I guess its a Hemi pan I have to buy.  What pick up do I need to by for the pan I see there are a few different ones.

[John_Kunkel]

Natcho is correct....the HV pump is slightly thicker than the std pump, but not by much.

Stock pump cavity depth is 1 1/2", the HV is 1 3/4".  About a 15% difference.

[BSB67]

Stock/hp rotor is 0.945", the HV is 1.188".  Pump body is about 1/4" thicker, 1.5" vs 1.75"