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Posted By Discussion Topic: oil filter resistor -- page: 1 2     flatheadfan 12-13-2014 @ 11:29 PM reply profile send p.m. Member Posts: 450 Joined: Oct 2009 I have a '46 59L engine. It has a standard Ford head mounted oil filter. However, it doesn't have the plumbing hooked up to it. I understand where the out-port and in-put lines go. My question is the location of the in-put resistor (0.060"). Does it attached directly on the back of the block next to the oil sender or in the line going to the filter or directly on the oil filter itself? Or, doesn't it matter, just have one? Thanks Tom ken ct. 12-14-2014 @ 4:57 AM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 It goes into the feed line to the filter ,either at the port at the rear of block or screws into the input line hole at the filter. It can go either place but NOT inside of filter. You only need 1 of them. Hope this helps. ken ct. rick50 12-20-2014 @ 4:03 AM reply profile send p.m. Member Posts: 25 Joined: Oct 2014 I recently purchased a '50 Deluxe with an eight cylinder. I have no experience with flatheads. I'm learning new things everyday. The car is equipped with the head mounted filter assembly. The feed and return lines have been fabricated from steel lines commonly sold at auto parts stores. There is no restriction in the lines. Should there be a restriction? If a restriction is required where is it located? Where can I purchase one? I looked in my service manual. There was no mention of the filter. All information is greatly appreciated. TomO 12-20-2014 @ 8:35 AM reply profile send p.m. Senior Posts: 7243 Joined: Oct 2009 The restriction is usually in the input fitting. Tom 37 Coupe 12-20-2014 @ 8:50 AM reply profile send p.m. Member Posts: 361 Joined: Oct 2009 I use to comment on this subject all the time but never had anyone else collaborate with me so I sorta gave up on it. However it is tough to not say anything about this when bumdope is put out. I have had many original low mileage from the factory Ford 59A engines with the factory Fram air cleaner canister and not one was ever equipped with a line restrictor.I am only referring to the engine I know and have had experience with. If you look inside the canister you will find a small hole on center tube this is the restrictor that maintains the pressure. This allows oil to enter the canister and filter to be cleaned and clean oil enters the restrictor hole. Those that are for some reason feel the need to add another restrictor are not hurting anything they are just not filtering any oil,it may as well be plugged. I do believe when Ford started using the canister type filter that Fram supplied as an accessory in 1940/41 did not have this inside restrictor and an outside was provided in oil filter service kit O1A-18671 but also believed this was corrected and not needed in 42-48 engine filters. I just wish that at least one owner of an all original 59 A engine would collaborate this and put this to rest. Just look at what is proved to be an original plumbed up filter and you will NOT see an outside restrictor but you will see the hole on inside verticle canister tube. flatheadfan 12-20-2014 @ 1:10 PM reply profile send p.m. Member Posts: 450 Joined: Oct 2009 Now you got me really wondering! It would seem that without a resistor the oil pump would spend most of its' start-up time filling the empty oil filter canister rather than feeding the moving parts of the engine (less resistance). Yet, when you look at the resistor hole (0.060) it could be easily plugged thereby cutting off the oil to the filter. Hopefully, some more folks will chime-in on this. Tom 37 Coupe 12-20-2014 @ 3:34 PM reply profile send p.m. Member Posts: 361 Joined: Oct 2009 The oil would fill up the canister very quickly as most of the volume is taken up with the filter itself. I remember one time on my 46 Ford I had not tightened down on the top enough or had the seal crossed up and I had oil everywhere. If you feel brave and have enough oil dry handy leave top off and have a helper to shut it down quick while you watch and scramble. This will also show you that more oil shoots through the bypass oil filter than the naysayers/promoters of full flow will want you to believe.A Ford V8 Times adviser that I won't mention his name but he graduated from Purdue engineering tested these filters a few years ago and proved how many times oil cycled through and it was pretty impressive. As far as the resistor being added to and again I am only referring to the 59A engines isn't it strange that people are adding this because it is missing? Could it be the Ford engineers or Fram ones never installed it for a reason? I know you said your plumbing was missing(lines) but was the original brass inlet in place? It should have a good size hole if original 1946-1948 Ford. Another problem mayby if one has the first generation O1A canister it does look like later ones and they evidently needed an add on outside the canister because there was no where else to put it. This all started on here and Fordbarn years ago. I bet a lot of guys have very clean oil canisters. I have no documemtation to back this but I know two original engines I had relied on only the internal hole on center tube. rick50 12-22-2014 @ 9:48 AM reply profile send p.m. Member Posts: 25 Joined: Oct 2014 I finally had a chance to inspect the filter housing of my '50. There is a restriction in the brass fitting on the inlet line. Thanks for the information regarding this style of filter. kubes40 12-22-2014 @ 3:49 PM reply profile send p.m. Senior Posts: 3370 Joined: Oct 2009 As a restrictor fitting was used through at least 1950, I would find it very difficult to believe Ford deleted this practice during 42 - 48. All of the very authentic cars I have owned and serviced of those years certainly had it (the special fitting). The previous post in regard to it becoming clogged...all I can say is if a .060" hole under pressure becomes clogged, there are more serious engine issues to deal with... 37 Coupe 12-22-2014 @ 6:17 PM reply profile send p.m. Member Posts: 361 Joined: Oct 2009 Well one thing about it is that I will never post my view on this again. But I will ask you this as it comes up all the time.You say ones you service have always had this orifice,tell why this question comes up many times for people who cannot find this orifice on the inlet,where did they go? Why over the years would someone remove this and put on the non orifice fitting that I have found? Evidently others have not found it installed or this question would not come up all the time. Sometime look inside one and see if you find the small hole on center tube.Thats it for me,sorry if I have messed someone up.

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