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Author Topic:   oil bypass
posted December 27, 2002 03:35 PM
What size tap/plug is needed to plug the oil bypass in the oil filter adapter?? SBC, of course. I am getting sick of moving the one I have plugged from engine to engine. Whats a good easy way to do this?? thx

posted December 27, 2002 10:18 PM
1/4" pipe tap. Dont thread it in too far or the plug will thread right throygh. Use Loctite.

posted December 27, 2002 10:22 PM
Just a note........make sure to use a flush head pipe plug, the kind you need a allen wrench to tighten.......

I once had a friend use a brass plug with a big head, as he tightened the oil filter the filter hit the plug........brass was found, motor was tore down thinking it was bearings in a brand new motor.......wasted a pile of time and money......

somethings can be soooo simple, LOL

posted December 28, 2002 12:39 PM


posted December 28, 2002 05:11 PM
So ALL the oil goes thru the all the "how to build SBC books", it is listed as the first modification to do to a race motor.

posted December 29, 2002 10:03 AM
the bypass only works on cold starts.

ive had some buddies who must have read the same books i guess cus they were blowing up oil filters....hmm!!


posted December 29, 2002 12:30 PM
Racing for 11 years ...all with plugged bypasses....never a blown all the oil thru the good for me....dont care what anyone else uses....

posted December 29, 2002 01:08 PM
66jj, You stated the by-pass ONLY works when the motor is cold.....DO YOU BELIEVE THAT STATEMENT???

The bypass opens allowing the oil to circulate the oiling system ANY time it can't pass threw the filter. While this is MOST often at cold starts when the oil is thick .......but it also has a bunch to do with other things.....such as oil filter..think of the filter like a screen..if the hole in the screen are too small the oil won't pass through when cold, or if the pump pressure/volume does NOT RELIEVE AT THE PUMP....ENOUGH.

Or some oil filters have check valves...this is to keep the oiling system prevent wear on cold starts......if the valve sticks shut you will by-pass the whole time never filtering any oil........
The flip side of that situation is if you plug the by-pass and the filter fails you can ruin a motor fast.........But you will see NO oil pressure on the gauge. If you had a by-pass you would have oil pressure but the oil would not be filtered.

I know people who have saved a motor by running a by-pass.......I know people who have ruined a motor because of running a by-pass............

Like everything in life there is good and bad in everything.

I personally plug the by-pass.

If the by-pass only worked when it was cold it would need a sensor to operate off temp some how.

Racer X
posted December 29, 2002 02:28 PM
Go ahead and plug it but don't rev the motor until its warmed up. Also, when racing if you see the pressure slowly dropping off, time to change the filter. Been doing this for more years than I care tom admit.

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