Quote:
Originally Posted by joespanova
Going back 14 years ago I lost an engine from what I thought was fatigue of an aluminum rod. There was evidence of oil starvation as the bearing was black and just appeared as though there was an oil starvation issue...............but I blamed the rod. I was probably wrong.
Fast forward to the last couple years and I've had everything from an oil pump bypass spring breaking ( lost that engine 3 years ago ) to constant oil pressure / starvation issues. It'll have great oil pressure until I make a hard pass or 2. At that point oil pressure drops and in at least 1 case I completely lost oil pressure and was fortunate to catch it before doing major damage. So , the attempt to remedy was to stop using K& N filters , use a WIX racing filter and use a bypass type filter mount ( dirty oil better than no oil ). Same eventual result in that oil pressure steadily dropped throughout the day / evening. Final round I ran the car with 20 lbs of oil pressure and kept my fingers crossed. At that point I decide to upgrade to a Dart block because of priority main oiling etc etc.
All the previous blocks ( 3 ) were Gen 1 blocks.
The latest block is a Dart Little M ( sportsman ) . So , I start the engine , great oil pressure ( Brad Penn breakin oil ). All week long start , run in some , get ready for the weekend. I think I'm good to go.........then UNBELIEVABLY the same problem is occuring with the Dart block! 2ND RUN PRESSURE IS DROPPING!
Only this time I have a NEW Melling 10552C pump. So , new pump , new block. Oil clearance .0025 /.003.
Engine 355 SBC , Brodix head , 14-1, No restrictors in block.
Moroso Ultimate 2 WET SUMP pan. Scraper.
Vac. pump pulls about 10"-12" vac .
AM I AT THE POINT WHERE A ROTOR TYPE STOCK PUMP CAN NO LONGER GET THE JOB DONE?
RPM range 8700-8900.
If so what do you recommend? Is it aeration? Bad pan design? Do I need to completely RETHINK my oil system? There has to be some common denominator here that transferred to each block.What about an accumulator?
Joe
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I have block the oil filter bypass for 35 or so years now never seen any problems yet alot of my applications are circle track along with street and strip builds.
How does blocking the bypass cause bearing issues or loss of oil?? I would really like to know as I am not seeing any issues !!!!!
What pan are you running?
Some times to much oil in the pan will cause a problem.
Those R filters have a 51 Micron rating which will let alot of debris though into the bearings, The 1061 NAPA Gold has a 19 to 21 Micron rating.
If your running cam bearings with 3 holes that a lot of bleed off no put a vacuum pump in the equation now your sucking oil out through the cam and cam bearing.
Again to much oil maybe your problem and maybe a better pan may help.
Not knowing your lifter bore clearance maybe causing a big bleed off.