Help, Oil Filter blew out at start up
#23
Le Mans Master
The filter bypass redirects the oil flow when pressure is higher on the pressure side than the side to the engine regardless of oil pressure. (restricted filters regardless if new or just dirty.) So if an oil filter can not flow what the pump puts out it is bypassed, if not you get a ballooned filter or worse. It is differential pressure that makes it open nothing to do with pump pressure. Oh well each to their own opinions right or wrong!
The oil filter bypass is irrelevant to how the pump regulates pressure.
#25
Oil filter blowout
I had the same exact thing happen on a newly built 350. I blew 3 filters and finally blew the filter adapter off of the engine until I realized the oil pump pressure relief plunger was stuck. I took the plunger out of the pump and cleaned it with a scotch bright pad and reinstalled and that fixed the problem. It had nothing to do with the brand of oil filter. Good luck.
#26
Racer
Thread Starter
Thanks for the replies for possible causes and solutions. I purchased a K&N oil filter, installed it on the engine, did the start up procedure again and ran the engine for 30 minutes at 2000 to 2500 rpm with no problems. Every thing seems to be perfect. No adverse effects from losing all of my oil. I guess I shut the engine down in the nick of time. I'll never, ever use "fram" oil filters again. I sure was worried about all of the above mentioned possible causes but was relieved that only the "fram" filter was at fault. It only cost me a new filter, five quarts of oil, one pint of comp cams break in additive and a few sleepless nights.
#27
Melting Slicks
You've obviously figured out your problem. Its cheap filters on a high performanced engine. It had nothing to do with the bypass. The bypass on my 383 is pinned shut and I don't blow up oil filters, but I buy only K&N filters.
#28
Le Mans Master
There is suppose to be a oil filter by pass on your oil filter adapter. When the flow is more than the filter can flow it opens and by passes the filter. Either yours is not present or someone blocked it off trying to get full oil flow. Wrong thing to do. Check it out.
The bypass valve on the filter adapter is for bypassing a dirty/plugged filter element, it will open at around a 8-15PSI differential and the oil pump bypass is what limits overall system pressure.
#30
Burning Brakes
I run a Canton Racing billet filter adapter WITHOUT a bypass valve on all my Vettes and never have had problems with oil filter failures. Oil pressure is right at 70PSI on cold start-up where the oil pump bypass valve opens. I think he has an oil pump problem, if the bypass valve in the oil pump fails, you will DESTROY oil filter housings. Time to drop the oil pan
The bypass valve on the filter adapter is for bypassing a dirty/plugged filter element, it will open at around a 8-15PSI differential and the oil pump bypass is what limits overall system pressure.
The bypass valve on the filter adapter is for bypassing a dirty/plugged filter element, it will open at around a 8-15PSI differential and the oil pump bypass is what limits overall system pressure.
This is true, but the OP listed an acceptable oil pressure to start with, so should not be an oil pressure problem. Heavy grade oil and even cold oil does the same thing acts the same as a dirty/plugging up oil filter. I also run with the by pass shut off in the race car but I do have to get heat into the oil before touching the throttle or the filter has a problem. I also run the in can type filter to help this problem, much more stout but a messing thing to change. Any way the Oil pressure the OP listed is really not enough to cause a filter problem in any normal terms.