Obviously, the 'white' spring is stiffer, to delay bypass opening.
I hope it was not meant to be a trick question.

 

I have said this about 1K tinmes before, but just to perfectly clear: DO NOT use a HV pump with a stock pan.

Rich

 

Agreed Rich. I'll go one step further, and state, for 99.4% of street drivn engines, there is no reason to justify a HV pump. Another one of those 'race only' mods that some how made it's way to the 'street'.

 

Yep, I agree with your agreement

A motor with loose clearances might not be able to maintain optimum oil pressure with a stock volume pump, that would be the reason for using a bigger pump. There is no other reason. And if you use a bigger pump you need a pan with more capacity.

Rich

 

I guess I asked the wrong question; will that spring work with a stock system? Can I just swap the springs?

 

Yes you can. I know a couple of guys locally doing that very thing.

 

alright, i know i have a lot of questions, but I didn't even think about my oil pump when I began piecing my stroker together. I'm glad I came across this thread and about the oil cooler in a search (I think I'm ditching that). I don't mean to hijack your thread but I gotta ask another...

Should I get a different pump, or reuse my stocker? I spun a rod and a main bearing. There were metal shavings everywhere in my engine. Should I just clean it out and reuse it?

 

Please, don't even consider using an old pump during an engine rebuild. Hell a replacement Melling pump would run you a whopping $25.00, add another $15.00 for a pickup. Saving $40.00 by re-using your stocker just doesn't make any sense. I'd probably recommend an ARP Steel Pump shaft too. The plastic POS shafts are an accident waiting to happen.

 

I plan on using an oil cooler when I get the motor back together. The guy at the machine shop said that using a H.V. oil pump with the cooler would be a good idea. Opinions?

 

hey guys, thanks for the info and replies.

 

Loose the cooler and keep the pump.

 

what about this?

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

its got the 3/4" inlet, a screen, and a steel driveshaft. Not a bad price?

 

Don't know who Elgin is or about the quality. Don't risk your new engine.Get a name brand pump Melling,Moroso,Seal power,etc.
The pickup ya have is it used? If so it won't fit right unless ya get or make a bracket to hold it on.

 

To make this clear, HV/HP pumps are for when you change bearing clearences. You change the calculated "oil leak" from the bearings, so you must provide more volume/pressure to correct the extra leak. From what you have said, you are not changing bearing clearences or turning insane rpms, therefor a HV/HP oil pump is a waste of money. Some will ask what is the hurt in running more oil, my answer is what ever the price difference is between the stock pressure and the HV/HP unit. If you have ~10psi for every 1000rpms, you will be fine.

 

It can hurt (a lot) if you suck the pan dry. Which can, and does happen if you use a HV pump with the small stock oil pan and run an extended time at high rpm.

Rich