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On Converting an Oil Bath Air Cleaner to Paper Filter
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56D500boy
Posted 2016-12-18 8:36 PM (#529092)
Subject: On Converting an Oil Bath Air Cleaner to Paper Filter



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Location: Lower Mainland BC
This is post potentially dangerous. In the sense that some people won't like the idea.

My goal is to have the engine bay of my 56 Custom Royal D-500 look much like this (only nicer)



My car came with a 1957 Dodge V8 "sidewinder" air cleaner which was not appropriate for the my year. Plus it hid one of the 315 hemi valve covers which I did not like.

I put out Wanted to Buy post regarding the proper 56 D-500 air cleaner. Initially nothing came through. So in the meantime, I have been running this:



Eventually Martin Kolner in Arizona noted that he had two 1950's Chrysler V8 oil bath air cleaners that I could buy and play with. I bought one of them.

Some how I got into contact with Dave Homstad who has a 56 D-500 and who has converted an oil bath air cleaner to run Fram CA3490 paper filters. They fit nicely.
Dave gave me some hints about trimming the top plate (and oil bath filter material) but he said the trimming of the inside was difficult to describe (he is correct).

From Dave H's Charter.net website: http://webpages.charter.net/dhomstad/D500EngineFrame1Source1.htm :

Air cleaner: convert from an oil bath 4 bbl a/c to paper element for less mess and lower restriction:

Cut the side of the lid around the perimeter about 1.5 inches down from the top. Remove the oil element stuff.
Carefully chisel the spot-welds, 6 places, holding the oil element vanes to the top of the lid.

Optional: remove the throat of the base, but not the carb seat, to open up the throat from 2" diameter to 4" for better breathing.

Use 2 filters (7 1/2" ID, 2" high) for an early 80's Dodge Colt, Plymouth Horizon, or Honda Civic):

Mopar L573 FRAM CA3490 Motorcraft FA869
AC A757C Purolator FCA15 K-Mart KA55
Also, a K & N washable element could be used: 7 1/2" ID x 4" high.


So the other day, I got into it using a diamond tile saw to open a slot in the top, then my Bosch jig saw with metal blades (broke several), my Bosch angle grinder and aviation tin snips.

The following photos show some of what I have done. The base is a real hack job with most of the work being done with the aviation tin snips. Still needs a lot of work to clean it up (I will be using the angle grinder on the little saw teeth that I've ended up with). Dave Homstad warned, "You might not want to open up the throat to the full 4 1/8" from the stock 2" because that will expose a lot of hidden chambers and create a lot of metal chips that will be difficult to clean up" (I paraphrased that a bit). Nevertheless, I've opened the throat up, leaving me with the challenge of sealing off those hidden chambers and smoothing the flow from filter down into the throat. More to come on this later as I progress.

I intend to straighten out (bang with hammer and dolly) the top lid and fill the two holes where the spot welds pullled through and fill a dint or two on the side of the base and then sand, prime and paint the base and lid in the proper paint colour. ( Red Mopar: # P4349218 (valve covers and air cleaner on D500 only) according to Dave H's website).

So here is the current results (Note: I only left about 5/8" for the skirt on the lid - I just wanted to hide the orange rubber on the filter and leave as much free flow as possible):




Edited by 56D500boy 2016-12-19 1:58 AM




(TopLidAfterTrimming.jpg)



(OilBathAirCleanerInternalsGutted_inProgress_1.jpg)



(OilBathAirCleanerInternalsGutted_inProgress_2.jpg)



(OilBathAirCleanerInternalsGutted_WithOneFramCA3490.jpg)



(OilBathAirCleanerInternalsGutted_WithTwoFramCA3490s.jpg)



(OilBathAirCleanerInternalsGutted_WithTwoFramCA3490sAndTrimmedLid.jpg)



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Attachments TopLidAfterTrimming.jpg (139KB - 49 downloads)
Attachments OilBathAirCleanerInternalsGutted_inProgress_1.jpg (127KB - 51 downloads)
Attachments OilBathAirCleanerInternalsGutted_inProgress_2.jpg (118KB - 48 downloads)
Attachments OilBathAirCleanerInternalsGutted_WithOneFramCA3490.jpg (119KB - 48 downloads)
Attachments OilBathAirCleanerInternalsGutted_WithTwoFramCA3490s.jpg (129KB - 50 downloads)
Attachments OilBathAirCleanerInternalsGutted_WithTwoFramCA3490sAndTrimmedLid.jpg (112KB - 68 downloads)
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mstrug
Posted 2016-12-18 8:57 PM (#529097 - in reply to #529092)
Subject: Re: Converting an Oil Bath Air Cleaner to Paper Filter



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I don't think most people will have a problem converting your cars air cleaner to dry type filters. It still looks stock. Marc.
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56D500boy
Posted 2018-02-27 5:32 PM (#558940 - in reply to #529097)
Subject: Re: Converting an Oil Bath Air Cleaner to Paper Filter



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200010001001001002525
Location: Lower Mainland BC
Well, not much to report. But a bit. As I was drifting off to sleep last night, I was thinking about how to make a smooth transition down to the 4 7/32" hole. I had several ideas but the best one was finding a velocity stack that would work, perhaps with some modification.

This is where I am at (plus a little grinding off off those points):



This is what I found on the internet:

Quick Fuel 200-1QFT Carburetor Air Bell, 1.75 x 10.5 Inch



Found one locally in Canada for about the same landed price. Bought it.

Typically, it transitions down to the now standard 5 1/8" carb top, not the 4 7/32" that I need for my D500 WFCB carb. Which creates a bit of a "gap" or "bump" in the air flow.

This is what it looks like, laying loose in the oil bath air cleaner. It will need some trimming height-wise as well as on the outer diameter. I am not sure how to handle the "bump" at the bottom. I also bought a plastic Mr. Gasket 2082, 5 1/8" to 4 7/32" adapter that would cover that gap but it would probably have to be epoxied in place and I am not that keen on anything ( a chunk of epoxy) that could be sucked down the carb. I would be happier if I could find an aluminum 5 1/8" to 4 7/32" adapter that could be welded or pop-riveted to the air bell.

Mr. Gasket 2082 adapter:









Edited by 56D500boy 2018-02-27 5:49 PM




(QuickFuel200-1QFT1.75x10.5InchCarburetorAir BellInTrimmedOilBathAirCleanerHousing.jpg)



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Attachments QuickFuel200-1QFT1.75x10.5InchCarburetorAir BellInTrimmedOilBathAirCleanerHousing.jpg (158KB - 29 downloads)
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Powerflite
Posted 2018-03-03 12:09 PM (#559143 - in reply to #529092)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Location: So. California
I wouldn't try to get it perfect. Your bell idea does cover those inner areas so it *might* help airflow a little bit, but honestly, it probably won't even do very much. Of course you will want to cut the majority of the top surface off so that it doesn't cut off air flow to the bottom of the paper filter. The biggest restriction in air flow is the close proximity of the sides of the air cleaner to the inner wall and the small gap at the top of the cleaner. These areas are going to restrict you much more than the semi-turbulent air flow at the bottom due to the rough entrance. I would just get a die grinder with a carbide tip and cut all of those rough edges smooth, and then call it good.
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56D500boy
Posted 2018-03-03 12:19 PM (#559144 - in reply to #559143)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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200010001001001002525
Location: Lower Mainland BC
Thanks Nathan. I will smooth off the "teeth" wherever possible, trim the bell upper circumference as much as needed to not restrict flow, trim the bottom of the bell so the top fits down on the remaining upper ring of the oil bath, then rivet the bell to that ring and consider adding that small 5 1/8" to 4 7/32" transition piece and calling it a day.

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56D500boy
Posted 2018-03-03 7:37 PM (#559157 - in reply to #559144)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Posts: 3368
200010001001001002525
Location: Lower Mainland BC
56D500boy - 2018-03-03 12:19 PM
Thanks Nathan. I will smooth off the "teeth" wherever possible, trim the bell upper circumference as much as needed to not restrict flow, trim the bottom of the bell so the top fits down on the remaining upper ring of the oil bath, then rivet the bell to that ring and consider adding that small 5 1/8" to 4 7/32" transition piece and calling it a day.
:)


It was a lovely sunny day about 10C. My wife was out so I took advantage of that and did the noisy work of grinding the oil bath shell and cutting down the aluminum air bell. For the grinding I used a plug grinding stone on my Bosch 4.5" angle grinder.

This type of stone:



The Air Bell needed to be trimmed on the diameter from 10.5" to 7.5" diameter. I marked the cut line by measuring from the rim of the bell in 1.5" around the circumference. They I cut the bell with my Bosch Jig Saw (and metal blade). I purposely left the line so I can trim it closer after it is installed. Once the bell diameter was cut down, I could measure how much too high it was. It was about 0.5" too high so I marked it at 3/8" and then cut it with a combination of my Dremel and a cut-off blade and a hack saw. I took the line so the actual cut was a bit more than 3/8" (but less than 0.5"). The hack saw was actually easier and faster but I did cut about 25% of the cut with the Dremel.

When I trialed the air bell back in the oil bath shell, it is still a bit too high but that is what I wanted. Then I trialed the Mr. Gasket 2082 adapter in the bottom and then tried the FRAM CA3490 filters, first with one and then with two. I think this is actually going to work.

More trimming, glueing and riveting in the coming days.

Here are the photos of today's work:



(TrimmedAirBathShellAfterSomeGrindingWithPlugStoneOnAngleGrinder.jpg)



(TrimmedAirBellSittingInOilBathShellShowingNeedForAdditionalTrimming.jpg)



(TrimmedAirBellShowingNeedForHeightAdjustment.jpg)



(TrimmedAirBellMarkedUpToShowNeedForTrimming3_8thsInch.jpg)



(TrimmedAirBellAfterRemovalOfExtraHeight.jpg)



(TrimmedAirBellInOilBathShellShowingNeedForAdditionalMinorTrimming.jpg)



(TrimmedAirBellWithMrGasket2082PlasticAdapter.jpg)



(TrimmedAirBellWithMrGasket2082PlasticAdapterAndOneFramCA3490Filter.jpg)



(TrimmedAirBellWithMrGasket2082PlasticAdapterAndTWOFramCA3490Filters.jpg)



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Attachments TrimmedAirBathShellAfterSomeGrindingWithPlugStoneOnAngleGrinder.jpg (213KB - 27 downloads)
Attachments TrimmedAirBellSittingInOilBathShellShowingNeedForAdditionalTrimming.jpg (189KB - 31 downloads)
Attachments TrimmedAirBellShowingNeedForHeightAdjustment.jpg (161KB - 29 downloads)
Attachments TrimmedAirBellMarkedUpToShowNeedForTrimming3_8thsInch.jpg (113KB - 29 downloads)
Attachments TrimmedAirBellAfterRemovalOfExtraHeight.jpg (104KB - 30 downloads)
Attachments TrimmedAirBellInOilBathShellShowingNeedForAdditionalMinorTrimming.jpg (148KB - 28 downloads)
Attachments TrimmedAirBellWithMrGasket2082PlasticAdapter.jpg (171KB - 27 downloads)
Attachments TrimmedAirBellWithMrGasket2082PlasticAdapterAndOneFramCA3490Filter.jpg (158KB - 30 downloads)
Attachments TrimmedAirBellWithMrGasket2082PlasticAdapterAndTWOFramCA3490Filters.jpg (197KB - 33 downloads)
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56D500boy
Posted 2018-03-15 9:21 PM (#559971 - in reply to #559144)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Location: Lower Mainland BC
I've been working (slowly) on this air cleaner project and I don't know if I ever tested it on the carburetor. So I was out playing around with the cold air intake idea and thought that I should also check the modified oil bath air cleaner to see how it fits and what I still need to do.

First thing was I needed to clock/tilt the PS pump over a bit to make sure that I had clearance. The chrome air cleaner that I have been running is 14" in diameter. The OE style oil bath shell is just about 16" in diameter and therefore I needed to adjust or "clock" the PS pump (1/2" box end wrench, two nuts, no biggy). That done, I put the modified oil bath on the carb and then started building it component by component, i.e. the "bell", the transition, the two filters and the top cover. I had an extra "315 HEMI HEAD" vinyl sticker so I put it on the top pie plate for fun. I was impressed by the factory indents in the driver side and bottom of the oil bath shell to clear various things, e.g. the Carter ceramic bowl fuel filter (not yet re-installed) and the choke mechanism (mine is electric).



Edited by 56D500boy 2018-03-16 12:55 AM




(TestingTheModifiedOiBathOnTheCarb_1.jpg)



(TestingTheModifiedOiBathOnTheCarb_2.jpg)



(TestingTheModifiedOiBathOnTheCarb_3.jpg)



(TestingTheModifiedOiBathOnTheCarb_4.jpg)



(TestingTheModifiedOiBathOnTheCarb_5.jpg)



(TestingTheModifiedOiBathOnTheCarb_6.jpg)



(TestingTheModifiedOiBathOnTheCarb_7.jpg)



(TestingTheModifiedOiBathOnTheCarb_8.jpg)



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Attachments TestingTheModifiedOiBathOnTheCarb_1.jpg (208KB - 33 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_2.jpg (141KB - 32 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_3.jpg (128KB - 30 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_4.jpg (151KB - 31 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_5.jpg (144KB - 35 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_6.jpg (157KB - 30 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_7.jpg (105KB - 30 downloads)
Attachments TestingTheModifiedOiBathOnTheCarb_8.jpg (105KB - 31 downloads)
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56D500boy
Posted 2018-06-03 2:16 AM (#564444 - in reply to #559971)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Location: Lower Mainland BC
With the carpet finally in and the front seat back in so I can drive the car on the street, I decided to go back and catch up on some of the projects that I started a long time ago. That included the conversion of the oil bath aircleaner to paper. So I got back at it the other day.

The first thing I did was to trim the aluminum ring a bit more. I placed it back in the air cleaner and used the black plastic adapter to center the aluminum ring. Then I drilled two holes through the edge of the ring into the air cleaner and installed two temporary self-tapping screws. Then I used the plug stone in my angle grinder to grind the aluminum ring to the same outer diameter as the portion of the OE cleaner below it. Then I removed the ring and touched it up with some hand sanding and/or Dremel disc.

Overnight, I treated the interior bottom with some Evaporust. In the AM, I emptied the Evaprust out and wire brushed and sanded the interior. Then I wiped and vacuumed it out and painted the interior with Tremclad semi-gloss rust paint. I also applied some spot putty to some minor dings in the shell. I let that dry and then sanded it out with 100 and 400 grit sand paper. Then I applied a second coat of spot putty, as needed.

When that was dry I sprayed the outside of the shell with two coats of DupliColor High build filler/primer (sanding with 400 between coats). When the second coat was dry I lightly sanded the primer and wiped off the dust with a blue shop towel. Then I sprayed two coats of Mopar Engine Red (supposed to be very close to the OE D500 red).

Tomorrow I will debate about a third coat of red after I install the inner aluminum ring with some Red RTV silicone and probably six 1/8" pop rivets. I will seal the edge of the aluminum ring to the OE ring with the RTV. The black plastic ring will be installed with RTV as well. In both cases, there will be no excess silicone to come loose get inhaled by the engine.

Before the Evaporust (followed by "After") and some photos from today:





Edited by 56D500boy 2018-06-03 11:10 AM




(CreatingADryFilterD500AirCleaner_1.jpg)



(CreatingADryFilterD500AirCleaner_2.jpg)



(CreatingADryFilterD500AirCleaner_3.jpg)



(CreatingADryFilterD500AirCleaner_4.jpg)



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Attachments CreatingADryFilterD500AirCleaner_1.jpg (161KB - 16 downloads)
Attachments CreatingADryFilterD500AirCleaner_2.jpg (184KB - 20 downloads)
Attachments CreatingADryFilterD500AirCleaner_3.jpg (175KB - 17 downloads)
Attachments CreatingADryFilterD500AirCleaner_4.jpg (194KB - 18 downloads)
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Powerflite
Posted 2018-06-03 9:13 AM (#564459 - in reply to #529092)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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So which one are you going to use, the cold air intake or the oil bath?
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56D500boy
Posted 2018-06-03 9:48 AM (#564462 - in reply to #564459)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Powerflite - 2018-06-03 9:13 AM
So which one are you going to use, the cold air intake or the oil bath?


I am going to use the converted oil bath for the photos required to get "Collector" Plates for my car and maybe a "purist"-type car show or two. The cold air intake and air cleaner is an experiment with unknown results (so far) but I will run it too (in the hotter months). In fact, I will keep all three and run them as needs be.



Edited by 56D500boy 2018-06-03 10:36 AM
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56D500boy
Posted 2018-06-03 6:58 PM (#564502 - in reply to #564444)
Subject: Re: On Converting an Oil Bath Air Cleaner to Paper Filter



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Location: Lower Mainland BC
56D500boy - 2018-06-03 2:16 AM
Tomorrow I will debate about a third coat of red after I install the inner aluminum ring with some Red RTV silicone and probably six 1/8" pop rivets. I will seal the edge of the aluminum ring to the OE ring with the RTV. The black plastic ring will be installed with RTV as well. In both cases, there will be no excess silicone to come loose get inhaled by the engine.


Raining outside so no painting.

Carried on with the completion of the conversion.

I place the aluminum velocity stack back in the interior of the OE oil bath shell and used my temporary screws to hold it in place while I drilled four 1/8" holes (of six) through the aluminum ring and the metal lip of the OE shell. Then I pinned the ring in place with 4 pop rivets (just loose) and removed the two screws. Then I drilled the final two 1/8" holes and tried 1/8" rivets in the holes. Looked good.

Then I removed the ring to sand out any drilling burrs and to check the OE lip to make sure that I had caught enough metal (I had).

When I was finished sanding (and polishing) the aluminum ring, I ran a bead of red RTV silicone along the flat of the metal lip, trying not to add too much but also trying not to go too little (There was a bit of both, but easily fixed).

Then I placed the aluminum ring back into the OE shell, on top of the RTV on the metal lip and added the loose rivets again. Then I popped the rivets one by one (I had got lucky and the diameter of the inner filter and the location of the rivets were *JUST* big enough to allow me to get my pop-rivet tool in place).

Then I wiped the excess RTV from the edge of the aluminum ring. I checked the RTV with my portable mirror and found a few spots where I had not added enough on the metal lip. Easily solved: A little RTV on my finger tip, rubbed into the groved and wiped off.

I went around the entire rim checking, adding/wiping as needed until it was all good (enough). Once the RTV sets up, I am pretty sure that there won't be any spalling off of bits.

That done, I laid two beads of red RTV where the black transition ring was going to go. (NOTE: The transition ring is there to seal off the ugly inner cavity of the OE shell that resulted from my removal of the inner "tower" of the OE shell.) Then I placed the transition ring in to the air cleaner and wiped any excess RTV off. I placed a large metal bowl that was handy on top of the transition ring and filled the bowl with water to hold the ring down while the RTV set.

I am not sure if I will do anything (e.g. metal tape) to cover the exposed RTV and the bottom of the transition ring.

I would like to thank Dave Homstad for inspiring me to make this conversion. He had blazed the trail and I just followed (with some deviations).

Photos from today:



Edited by 56D500boy 2018-06-03 8:20 PM




(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithUnPoppedRivets.jpg)



(OEOilBathAirCleanerConvertedToPaper_VelocityStackRemovedToCheckRivetHoles.jpg)



(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV.jpg)



(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivets_CheckingRTV.jpg)



(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_Wiped.jpg)



(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_LayingInBeadForBlackAdapter.jpg)



(OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_WithBlackAdapterInPlace.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_1.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_2.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_3.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_OnTheEngine_1.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_OnTheEngine_2.jpg)



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Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithUnPoppedRivets.jpg (120KB - 19 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_VelocityStackRemovedToCheckRivetHoles.jpg (125KB - 20 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV.jpg (127KB - 22 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivets_CheckingRTV.jpg (162KB - 17 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_Wiped.jpg (126KB - 21 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_LayingInBeadForBlackAdapter.jpg (116KB - 20 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_ModifiedVelocityStackPinnedInPlaceWithPoppedRivetsAndRedRTV_WithBlackAdapterInPlace.jpg (104KB - 18 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_1.jpg (116KB - 18 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_2.jpg (133KB - 20 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_3.jpg (89KB - 23 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_OnTheEngine_1.jpg (162KB - 21 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_OnTheEngine_2.jpg (148KB - 28 downloads)
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