Thread: Idle oil pressure

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It's not a high pressure bypass, it's a high differential pressure bypass.

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The valve is acted on by pressure on both the inlet side of the filter and the outlet. There is a spring on the outlet side as well. Normally, the two pressures cancel eachother out, no matter how high the inlet pressure is, and the spring presses the valve disc against the seat. However, if the filter becomes plugged, the pressure on the outlet side of the filter begins to drop and now there is a pressure differential across the filter. If the differential pressure becomes high enough to overcome the spring force on the disc, the bypass valve opens. It opens on high differential pressure, not high pressure.

Originally Posted by mod67

Mr. Stephen Roy:
The bypass you speak of is an oil filter bypass. If your filter becomes plugged, or your motor makes too much pressure it will bypass the filter and lube your motor with unfiltered oil. I generally plug them off for Racing applications. But in doing so you have to run a Fram HP4 or equivilent filter or the pressure will collapse the oil filter and give your motor no oil. <-- know this from experience.

Nice mod.
Are you coming to the Super Nats?

Erik... No way am i coming to the Nationals.
The guys who race those big money events are the best in the business. I do a good job of wheeling my car and sneak a win every now and then. But i think i would be kidding myself if i thought i could run with them. They have more money in their motors then i do my entire racing opporation. Not to mention both my motors are illegal for IMCA competition. They have silly stuff like roller cams and stud Girdles... I dont own any IMCA spec Hoosier tires. Our track rules are a cross between IMCA and UMP. Most all the tracks within driving distance have adopted the same rules as Chico so my car is legal around this area. Basically, i would go... but i have to work. :P

A lot of us old timers have always lived by 10 p.s.i. / 1000 rmp for oil pressure. also as metioned before check w/ mechanical gauge , my electeric gauge read 10 low even after installing " hi tech" (read $48 ) "sending unit. If I had space I would add "t" adapter and piggy back mechanical gauge under hood as I did on my 34. 31 5w

Back in the late 60's a friend of mine had a 58 Chevy running a 327 in F Gas. After every two-three weekends, he would have to replace the bearings. On a whim, he added STP at the manufacturer's recommended ratio and (with all other things being equal) he ran an entire season on the same set of bearings. He became a believer, and knowing this guy personally and having participated in several tear-downs of his engine, I personally witnessed this.

I'm going to start a new thread on this topic.