The Ford Barn

MidState-Flathead · 11-23-2021, 10:58 PM

first time build of an 8ba engine, how many out there have had great success with doing the extra drilling at the rear of the engine into the existing oil passage? I am not building a racer engine but as long as it will be apart should I attemp the drilling?

19Fordy · 11-24-2021, 10:00 AM

Why would you want to drill into the existing oil passage at the rear of the engine?

tubman · 11-24-2021, 10:45 AM

One thing I have never heard of are oiling deficiencies on a properly set up 8BA (unlike the "Y"-blocks). Why mess with it?

(I have never considered the bypass oil filter a deficiency the way most of these engines are usually maintained and operated.)

rotorwrench · 11-24-2021, 12:05 PM

Most folks do it for a partial bypass oil filtration system but drilling into the passage from the pump is not all that has to be done for partial bypass. There are several good threads on here dealing with partial and full bypass as well as the military set up that also had an external oil cooler. Some have good illustrations and photos. If it's not plumbed up correctly, it can cause bearing failures due to oil starvation.

The rear main has a direct passage from the oil pump so 100% bypass has to have an oil feed that bypasses the normal system completely. This is accomplished by directing the oil feed out of the pump through the side of the oil pan. If this isn't done then the system is still a partial bypass. It may be less partial than the original system but the original filter system still bypasses all of the oil over a short time so it works as good as what many other manufacturers had in that time frame.

Flathead · 11-24-2021, 12:19 PM

I wouldn't bother for a mostly stock motor. If you start with a clean motor, use good oil with the original filter and change the oil regularly you will be good to go with no worries.

19Fordy · 11-24-2021, 12:50 PM

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Like the Beatles sang, "Let It Be". Just make sure cam bearings, rod bearings and main bearings are good.

aussie merc · 11-25-2021, 08:35 AM

just so everyones clear on your intensions WHAT ARE YOU TRYING TO ACHIVE ??????? could be the worst day of your engines life

MidState-Flathead · 11-26-2021, 10:33 AM

I appreciate all of your replys, the engine will have very lite use when rebuilt, you all have helped with the final answer, I will leave the original as is, again very much appreciate all the input

11-23-2021, 10:58 PM	#1
MidState-Flathead Junior Member Join Date: Nov 2021 Location: Central MN Posts: 16	8ba engine rebuild first time build of an 8ba engine, how many out there have had great success with doing the extra drilling at the rear of the engine into the existing oil passage? I am not building a racer engine but as long as it will be apart should I attemp the drilling?

11-24-2021, 10:00 AM	#2
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,921	Re: 8ba engine rebuild Why would you want to drill into the existing oil passage at the rear of the engine?

11-24-2021, 10:45 AM	#3
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,302	Re: 8ba engine rebuild One thing I have never heard of are oiling deficiencies on a properly set up 8BA (unlike the "Y"-blocks). Why mess with it? (I have never considered the bypass oil filter a deficiency the way most of these engines are usually maintained and operated.)

11-24-2021, 12:05 PM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,422	Re: 8ba engine rebuild Most folks do it for a partial bypass oil filtration system but drilling into the passage from the pump is not all that has to be done for partial bypass. There are several good threads on here dealing with partial and full bypass as well as the military set up that also had an external oil cooler. Some have good illustrations and photos. If it's not plumbed up correctly, it can cause bearing failures due to oil starvation. The rear main has a direct passage from the oil pump so 100% bypass has to have an oil feed that bypasses the normal system completely. This is accomplished by directing the oil feed out of the pump through the side of the oil pan. If this isn't done then the system is still a partial bypass. It may be less partial than the original system but the original filter system still bypasses all of the oil over a short time so it works as good as what many other manufacturers had in that time frame.

11-24-2021, 12:19 PM	#5
Flathead Senior Member Join Date: May 2010 Location: Southern Maine Posts: 1,497	Re: 8ba engine rebuild I wouldn't bother for a mostly stock motor. If you start with a clean motor, use good oil with the original filter and change the oil regularly you will be good to go with no worries.

11-24-2021, 12:50 PM	#6
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,921	Re: 8ba engine rebuild Sponsored Links (Register now to hide all advertisements) Like the Beatles sang, "Let It Be". Just make sure cam bearings, rod bearings and main bearings are good.

11-25-2021, 08:35 AM	#7
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,029	Re: 8ba engine rebuild just so everyones clear on your intensions WHAT ARE YOU TRYING TO ACHIVE ??????? could be the worst day of your engines life

11-26-2021, 10:33 AM	#8
MidState-Flathead Junior Member Join Date: Nov 2021 Location: Central MN Posts: 16	Re: 8ba engine rebuild I appreciate all of your replys, the engine will have very lite use when rebuilt, you all have helped with the final answer, I will leave the original as is, again very much appreciate all the input

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