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Donor truck 55 1st w/ aux oil filter ,Its a screw on throw away filter PH-8A mounted on firewall , inlet to filter on drivers side , on T at oil presser gauge, outlet on passenger side ( center at top of head could be oil gallery ) I wanted to use this filter on my '55 1st rebuild , until I was told by someone who is supposed to have a lot of knowledge on 235s told me that not just my filter but any filter was no good ....
#1 Is this hook up ok
#2 Will the filter , filter enough oil to make it worth while ...

1. That return line routing was a common re-routing that was only needed/used if the internal oil-feed was providing inadequate lubrication to the rocker arm assembly. After-market oil-flow diversion kits (I think non-GM - 6 Cylinder Rocker Arm Lubricating Kit) were sold for this purpose. Usually people/mechanics just bought an adapter/Tee, an oil line/tube, and necessary fittings. Some people think that this is a "cob-job", but it seems to work OK, at least for a while.

2. Unless you engine has be converted for using a full-flow oil filter, a by-pass filter is required (if you want a filter). If your oil-inlet line to the filter is a small diameter (maybe 1/8" inner diameter) it will work as a by-pass filter (about 10% of the oil flow goes through the filter - the rest of the oil flow is directed to oil journals in the block. This by-pass filtration works fine.

The restrictor size used in the conventional canister filter is 1/16". If a spin-on filter is substituted for that type it also needs a restrictor in the system or the engine bearings will be starved for oil from the volume going through the filter and back into the oil pan. I use a Holly carburetor jet with a 1/16" hole in it as a restrictor if someone insists on a spin-on filter installation.
Jerry

I measured the lines they are 1/8" , seems if the filter is pre filled what oil goes in goes out . checked lines on original oil filter they are 1/8 also ....does the oil stay in head and oil system and not return to the pan ???? If I never lose oil pressure will my bearings be starved for oil ???? If 10 percent goes through filter then after 10 times of oil displacement would 100 percent be filtered ????

wanderer,

1/8" outer diameter lines? Jerry says 1/16" inner diameter - heed his advice.

The mathematical calculation for achieving 100% of the oil being filtered is not that simple; however, approximately 100% of the oil gets filtered in a reasonably short period of time.

If you never lose oil pressure and oil is flowing into all appropriate places in the engine, your bearings will not be starved.

The oil that drips out of the rocker arm assembly returns to the pan via the push-rod holes in the upper part of the cylinder head, and down through the holes in the block near/between the lifters.

The inside diameter is 1/8" . I've looked at 3 oil filters (off of AD Trucks ) all the lines are 1/8 ID and none of them had restrictors (they could have been removed ). Jerry I've looked in every book I've got and can't find Either 1/8" or 1/16" ....I'm going with this set-up unless I can find or be shown where 1/16" is right and 1/8" not ....also I can't find any jobber selling restrictors for oil filters ....

Your funeral, or at least your engine's- - - - -Go ahead.
Jerry

The lines used with the 1/8" connections will be mighty small inside and will limit the flow some what.

But Jerry is right, if you are using an aftermarket filter set up you'll want either a restricted filter, or the 1/16" restrictor in the line.

The Wix oil filter with the restrictor in it is 51050. Napa number is 1050. You FLAPS should be able to exchange these numbers if they don't handle Wix or Napa filters.

After reading your post again, it sounds like the filter is plumbed into to the pressure side on both the drivers side of the engine and the passenger side. Coming off the oil pressure fitting, to the filter, then to the passenger side port on the head means both lines are tied into a pressure port. So not sure how much filtering will happen.

Thanks Roy this helps , you are right about where it is plumbed when I go back with it on my rebuild I'll plumb the return into the drivers side , where the original filter was ..I'll go to town tomorrow and pick up a restrictor ....the reason I'm wanting to use the firewall mounted filter is , I've got Fenton headers & intake , thinking they will be in the way ....

Thanks again for the help Roy ....

The PH-8A is a full flow filter like I use on my Y-Blocks. It was never meant to be used as a by pass filter.

http://www.framcatalog.com/PartDetail.aspx?b=F&pn=PH8A%22
A full flow filter filters all of the oil and has the capacity to filter all of the oil the pump puts out. Because of this capacity, it is not designed to filter smaller particles. A bypass filter has much denser media and filters much smaller particles, but it filters only a small portion of the oil.

http://www.framcatalog.com/PartDetail.aspx?b=F&pn=C4

If you are pulling oil supply off of a T, it is plumbed as a bypass filter. If you have a PH-8A hanging on your firewall, it is just a worthless piece of junk that you should get rid of. Whoever installed it probably knew about as much about engine lubrication as you do.

Baldwin has a good article explaining bypass and full flow filtration.

http://www.baldwinfilter.com/ProductHighlights102011.html

Baldwin is one of the major suppliers of filters used on Diesel engines.

I never said I knew about it , I know enough to ask you guys about it ....Some of you are help ...some of you are.....If I knew all about 235 engines I wouldn't belong to this forum ....
Anyway thanks for the information ....

Your local parts store can convert the Wix number I gave you or the Napa number and you won't need a restrictor in the line. The filter is made as a bypass filter and the restrictor is built in.

Baldwin filter is B50. Also has the restrictor built in. This way, everytime you change the filter, you also change the restrictor thus making sure it is not plugged.

wanderer,
we should clarify where the restriction is on the type of filter used on AD trucks. Look inside the can at the pipe in the middle. Partway down you will see a tiny hole in the pipe. All the oil moving through that can has to exit through that hole.

Looks like the PH8A has a 3/4 x 16 thread where the Wix 51050 has 5/8 x 18 so it won't fit your base. So you may need the restrictor after all.

Giving advice: $10.00 an hour

Listening to advice: $10.00 an hour

Arguments: $100.00 an hour

Getting well-meaning advice rejected out of hand does not particularly put me in a mood to share any more facts and figures. It's very simple to thread the inside of one of the fittings used to plumb a spin-on oil filter for a 1/8" Allen-screw pipe plug with a 1/16" hole drilled in it. Then it won't matter what type or part number spin-on filter is used.
Jerry

The WIX 51050 filter is a bypass style filter with a built in flow control orifice. Does anyone know the size of the orifice?

There is a WIX 24755 base for that filter. It has 1/8 NPT hose/line ports; however, the size of the flow control orifice in the filter is what matters.

Here are WIX 51050 equivalent spin on filters

I cannot fine a spec for the orifice, but some people say it is 1/16"

Ok .... If I put a Orifice ( store bought or home made, as long as it has 1/16" hole in it ) installed in the T where the oil presser gauge is .... just like elect. path of least resistance ( this will only let a set amount of oil to the filter the other oil will be forced to the bearings , rocker arms etc. )
And returning the oil out of the filter to where the original filter did .... (drivers side )
Then I can use the filter (PH8A) ....or any filter ..
If you don't agree with this please let me know ....

That's exactly what I was suggesting. The PH 8 has a very open-weave filter element so enough oil can flow through it to supply the volume an engine needs to lubricate everything without excessive pressure loss. That means you'll get the same extremely inefficient filtering as every other engine with a full flow filter gets, as opposed to the close-mesh element the GM engineers specified with their canister filter. There are spin-on filters that we used for various types of hydraulic units in an industrial environment that would provide much better filtering while still offering the convenience of a disposable filter can. Research Baldwin or WIX for a filter that fits your spin-on base and provides as small a micron size as possible. All the PH 8 will do is look like a filter when compared to an original-equipment canister filter.
Jerry

If you are new to the workings of oil filters, then the bypass oil filter may seem a dopy way to go since all you normally see these days is full flow. Here is a link that gives some info
http://www.amsoil.com/shop/by-produ...-and-mounts/dual-gard-oil-bypass-system/

Dennis

Thanks for the info. Now I'm in mind set to mount the original canister filter on the firewall ....and use the close-mesh element G.M. engineers for the canister filter ....( I've got 3 of them , I located the hole in pipe that's in the canister , [hard to see its so small]

I wouldn't say that ALL bypass filters are significantly better than full flow:

A WIX 51515 (PH8A crossed) is a 21 Micron filter.

Used in CJ2s
Wix: 51006 32 micron
Wix: 51080 21 microns
Wix: 51010 32 micron

The standard C4 filter used by Chevvy in 50's trucks is not that great. Again, FRAM doesn't post specs but using a WIX 51006 is ONLY 32 micron!!!!!

You'd be better off with a PH8A and the PROPER installation than the original C4 or the modern WIX equivalent.

Modern specialty filters (AMSOIL etc) and even 50's toilet paper filters (frantz, etc) can get into the sub 5 micron range but with SIGNIFICANTLY DENSER media.

Any filter is better than no filter, though. Run whatever you can or change oil frequently.

As for orifice restriction original 40's and 50's bypass filters the restriction was in the return tube that the filter mounted on, not the inlet.

For example, the Ford L134 motor used in the GPW had a .064in orifice as shown

IN THIS PHOTO to regulate oil flow.

Putting the restriction AFTER the filter evens out the flow through the filter.. it more or less sees the same flow through the filters life. Putting the restriction BEFORE it means that the flow through the filter is variable.

For screw on tpe filters this may not hold true.. but for cartridge elements is does.