Thoughts on high volume oil pump

[black_demon69]

OK I am currently rebuilding my 4.0l and was wondering what your thoughts are on a high volume oil pump for this build.. Supposed to be an extra 20% more oil flow...

 

[rusty ol ranger]

I had them throw one in my 460 when they did the bottom end. It cant hurt.

 

[Bird76Mojo]

I'd just run a factory replacement. A Mellings brand if possible.

https://www.enginebuildermag.com/2010/08/advantages-myths-and-fables-of-high-volume-oil-pumps/

 

[RonD]

Oil pressure is the oil your engine CAN NOT USE at that time

10psi oil pressure means your engine can't use all the oil the pump is providing, and its backing up in the main passage with 10psi pressure

The oil has to squeeze out of bearings and lifters and oil passages and only so much oil can do that at any given RPM and oil viscosity

No oil pressure would mean pumps not supplying enough oil

Above 60psi would be too much pressure in most engines, and you can get "washing" at the bearings, the oil PRESSURE is high enough so that it pressure washes bearing surfaces so no oil and they get real hot real fast and fail

Generally speaking stock oil pump will provide 10psi at 1,000RPM, 20psi at 2,000RPM, 30psi at 3,000RPM, and usually top out at 45psi
So more than enough flow since engine is using much less oil flow at 3,000rpm since pressure is now 30psi

 

[alwaysFlOoReD]

As long as all the oil clearances are spec, I agree, run a standard pump. You just lose some horsepower running a higher volume/pressure pump.

 

[black_demon69]

Just thinking about higher volume pump due to the fact that the 4.0l can have a little trouble with oiling the valve train and a little more oil pressure as engine wears would be a good thing...


And of course it will be a meling for sure standard pump or high volume

 

[alwaysFlOoReD]

I would be inclined to fix the oiling problem rather than a bandaid [HV oil pump].

 

[Uncle Gump]

I look at oil pumps just like I do batteries and ignition coils... It never hurts to have the extra potential. That said... do you need it... probably not. The extra volume won't make it past the pressure relief and be dumped back to the oil pan.

 

[Bird76Mojo]

In that case, it'll also work the oil harder.

 

[adsm08]

HV pumps are for old engines that have bottom end wear, or racing engines that are built loose. A properly rebuilt on has no need for such a device.

 

[rusty ol ranger]

HV pumps are for old engines that have bottom end wear, or racing engines that are built loose. A properly rebuilt on has no need for such a device.

I put one in my 460 for the fact it sees 3 or 4 hr hwy trips on occasion towing my camper at 65mph with the O/D off.

Figured it couldnt hurt.

 

[Uncle Gump]

A quick google search will give you hours of reading on this subject.

When I owned my shop... I stocked one stock oil pump and six different part numbers of high volume pumps. I personally never built a VW engine with a stock pump. When I would use the big Melling pumps... that engine would get an add on oil sump for additional oil capacity. I would also use the stock oil pressure relief springs... I just wanted the extra volume if the need ever came up.

 

[85_Ranger4x4]

When I freshened up my used 5.0 I used a new std Melling pump. Figured if that couldn't hack it I would need to either rebuild the engine or find a different one.

8 years later 35psi cold, 15lb hot. The truck didn't even have overdrive until recently and has yet to drive on the road with it.

I guess put me in the camp that if everything else is working right you don't need it.

 

[black_demon69]

Think I will just get a standard pump meling of course

 

[black_demon69]

Thanks for the input