high volume oil pump worth the $$$?

[kapnklug]

After looking at the pictures posted by 3Dubs, I'm planning on installing a DSG stud girdle in my 86 M1009, and changing the motor mounts and rear main seal at the same time. Since I have to remove the oil pump anyway, I was thinking of upgrading to one of these:
6-5liter.com - Replacement 6.5 diesel engines, featuring new, updated & improved castings. 6.5 IS ALL WE DO.
They're pretty expensive though, $165 plus shipping. Does this seem worthwhile?

 

[Ken_86gt]

Probably not. I have not been following these trucks very long, but I have yet to hear about lubrication related failures. In most engines it is a waste of money. If you are going to be racing your truck at high RPMS there may be case to do this. Now if you are going to be replacing bearings and such you might want to replace your existing with a stock type unit while you are there for about $35.

 

[jimk]

I don't have much exp in 6.5 so I have to speak in general terms. A higher volume pump (than stock) on a healthy engine is not only a waste of $ but puts extra loads on the oil (creates higher oil temps) and the pump drive parts( usually the cam gear(s) and cam drive). There is also a HP loss due to moving oil around for nothing*. It may be useful on a worn engine to make up for loose bearings/low pressure, or special applications( 70 Old 455 W30 comes to mind). Perhaps even in your situation, I really couldn't say.

A high pressure pump can be useful. One example is high rpm engines. Increasing the max engine speed usually requires additional oil pressure. That's keep the mains/rods happy(the bearing acts like a pump). Pontiac used a 60psi pump on their high perf engines (with hardened driveshaft and usually with a special dist gear treatment). When they made the 74' Superduty 455 the factory increased the dist. gear diameter along w/special block with bigger hole for dist. All that effort to run 80psi on a few thousand engines ! (the block also had an unused provision for a dry sump system).

*the extra oil goes to the relief valve and just gets dumped back into the pan

 

[scrapman]

Old school rule and, yes I am an old guy. 10# pressure minimum for every 1000 rpm you turn.