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Bypass Filter
#1334036 Sun Nov 17 2019 02:28 AM
Joined: Oct 2019
Posts: 35
W
Wrench Fetcher
On page 47 in Deve's book on rebuilding inline 6 engine there is the statement that the bypass system is the only filtration system available for the 216/235 engines, and that they send only about 12% of the oil through the filter. For only 12%, I don't see where it's worth the trouble.

Re: Bypass Filter
WarEagle1 #1334040 Sun Nov 17 2019 03:02 AM
Joined: Sep 2001
Posts: 30,004
ace skiver
It is well worth the trouble (no trouble, actually):

- minimal decrease in oil flow through the engine parts
- only 5%-12% meant that 100% was regulary filtered in a reasonable period of time
(I thought it was more like 5% being filtered?)


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Bypass Filter
WarEagle1 #1334041 Sun Nov 17 2019 03:14 AM
Joined: Feb 2004
Posts: 20,344
H
Boltergeist
Bypass filters do a better job of straining small particles out of the oil than full flow filters do. Since the media can be woven tighter, some types of bypass filters can remove particles down to 2-3 microns, while the best a full flow can do is about 10-12 microns. It's like straining out rocks, marbles and bowling balls compared to catching grains of sand. A really effective filtration system would have two filters, both full flow and bypass, like the older Cummins Diesels do.
Jerry


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Re: Bypass Filter
WarEagle1 #1334062 Sun Nov 17 2019 06:25 AM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
I don't see where it is worth the effort. I just have one cuz it looks cool.

Re: Bypass Filter
WarEagle1 #1334068 Sun Nov 17 2019 12:54 PM
Joined: Aug 2005
Posts: 8,999
Master Gabster
Opinions are like backsides, everyone has one. My backside says any filtration is better than no filtration. I have filters on both my '38 and '53. While I have no clue as to the percentage of oil that's diverted to the filter, it's enough that the canister gets hot almost as quickly as the radiator. I was surprised the other day when I was tinkering on the '53 and touched the filter canister before the car was fully warm and the canister was warm to the touch. By that anecdotal evidence I'd guess it's higher than the ~10% commonly claimed.


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Re: Bypass Filter
WarEagle1 #1334070 Sun Nov 17 2019 01:12 PM
Joined: Oct 2019
Posts: 35
W
Wrench Fetcher
Thanks guys good info as usual


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