http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1770&prmenbr=361
for those of you not familiar with these they slip between the block and spin-on oil filters, they don,t work on all sizes of oil filters, and they are not designed to replace frequent oil filter changes or allow longer times between oil changes
keep in mind the MAIN PURPOSE of pre-screens is to allow you a easy look at a SAMPLE OF the metallic, gasket,silicone and plastic crud that the oil system is pushing thru your engine,they are not designed to be filters,they do not trap 100% of the crud,(neither does your oil filter for that matter, they, the pre-screens, are designed to allow you to spot bearing or cam lobe wear quickly, but they only work if you take the time to INSPECT them frequently by spinning off the filler and inspecting them, the average oil filter has between 200 and 450 sq inches of filter area, these pre-screen have less than 10 sq inches of filtering area,so they are easily at least partly blocked with crud and can and do restrict oil flow if you NEGLECT to inspect and clean them FREQUENTLY we used them all the time on race engines that we worked on every week , and in that application they are a great help in catching problems before they become major, but if your like most guys and only take the oil filter off during 3000 mile oil changes THEY ARE A BAD IDEA for THAT APPLICATION
BTW most guys running race engines DON,T USE THEM as the ONLY source of info on engine condition MOST guys also cut open and inspect the oil filters themselves to look for bearing material and signs of engine wear
now Ive said this before, you also should have installed the good magnets in your engines oil pan, simply because they can trap and hold most of the metallic dust that a failing cam and lifter generates from getting constantly pushed back into your engine to cause further damage
shrapnel screens installed in the lifter gallery and magnets in the lifter gallery , rear drain holes in the heads and oil pan sump, plus a decent screen on the oil pump pickup go a LONG WAY toward preventing metallic trash from reaching the oil pump
http://www.kjmagnetics.com/proddetail.asp?prod=D66SH
http://forum.grumpysperformance.com/viewtopic.php?f=54&t=120&p=150#p150
for those of you not familiar with these they slip between the block and spin-on oil filters, they don,t work on all sizes of oil filters, and they are not designed to replace frequent oil filter changes or allow longer times between oil changes
keep in mind the MAIN PURPOSE of pre-screens is to allow you a easy look at a SAMPLE OF the metallic, gasket,silicone and plastic crud that the oil system is pushing thru your engine,they are not designed to be filters,they do not trap 100% of the crud,(neither does your oil filter for that matter, they, the pre-screens, are designed to allow you to spot bearing or cam lobe wear quickly, but they only work if you take the time to INSPECT them frequently by spinning off the filler and inspecting them, the average oil filter has between 200 and 450 sq inches of filter area, these pre-screen have less than 10 sq inches of filtering area,so they are easily at least partly blocked with crud and can and do restrict oil flow if you NEGLECT to inspect and clean them FREQUENTLY we used them all the time on race engines that we worked on every week , and in that application they are a great help in catching problems before they become major, but if your like most guys and only take the oil filter off during 3000 mile oil changes THEY ARE A BAD IDEA for THAT APPLICATION
BTW most guys running race engines DON,T USE THEM as the ONLY source of info on engine condition MOST guys also cut open and inspect the oil filters themselves to look for bearing material and signs of engine wear
now Ive said this before, you also should have installed the good magnets in your engines oil pan, simply because they can trap and hold most of the metallic dust that a failing cam and lifter generates from getting constantly pushed back into your engine to cause further damage
shrapnel screens installed in the lifter gallery and magnets in the lifter gallery , rear drain holes in the heads and oil pan sump, plus a decent screen on the oil pump pickup go a LONG WAY toward preventing metallic trash from reaching the oil pump
http://www.kjmagnetics.com/proddetail.asp?prod=D66SH
http://forum.grumpysperformance.com/viewtopic.php?f=54&t=120&p=150#p150