oil pumps (not efi)

[dzorde at aesprodata.com.au]

     From my experience of high volume oil pumps, they are mainly used for 
     racing applications.  ie. when the crank is cross drilled, oil 
     channels smoothed and enlarged, cam lube holes pressure controlled, 
     etc all constantly running at high rpm's. In this case the extra 
     volume of oil is needed to keep the top end from running dry.  This is 
     also one of the reasons for having a puke tank connecting to the 
     rocker covers, it may just overflow.
     
     In most normal cases, the stock pump is fine, however placing a small 
     washer behind the relief spring to boost the pressure a little bit is 
     a good idea if the engine will redline now and then.
     
     Dan        dzorde at aesprodata.com.au


______________________________ Reply Separator _________________________________
Subject: RE: oil pumps (not efi)
Author:  diy_efi at coulomb.eng.ohio-state.edu at INTERNET
Date:    12/14/96 2:15 AM


>I have been reading this thread over the last few days and feel 
>compelled to interject the following;
>
>It is my understanding that on a Chevy small block, it is not 
>recommended to utilize a high volume oil pump.  This can cause the oil 
>to be pumped in a manner that will fill up the lifter valley while 
>choking off oil supply to the bottom end.  The recommendation appears 
>to use a high pressure pump, instead.  This would imply that there is, 
>in fact, a difference.
>
>John
     
Oh, there is -- look in your Summit or Jegs or ASAP catalog.  You 
can buy 'stock', 'high vol.', or 'hi-pressure' pumps.  And I 'spect 
the onliest difference in a hi-pressure pump is the size of the 
relief spring (just like in electric fuel pumps).
     
     
     
Tom Cloud <cloud at peaches.ph.utexas.edu>