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Originally Posted by kurt fischer
Originally Posted by Doug P
Hey Guys,
Gary hasn't asked the question yet, but it has been mentioned before. On an A65 with the 3-hose oil manifold, is it okay to add the filter to the oil tank return line and leave the small line connected straight to the rocker arm infeed? Other than circulating "unfiltered" oil are there any other issues?
Thanks,
Doug

That caused my '71 to empty the oil tank into the sump. Took about 10 miles, YMMV

Ran like that for 15 years, its never caused me any problems, perhaps it was a bad filter or a one way filter piped up the wrong way?
If you have a sump cover with magnetic drain bolt fitted and it is a "strong" magnet and too close to the pickup, this can cause wet sumping.

Doug, unless your shells are falling apart and passing metal fragments through the pump then the centrafugal filter (sludge trap) will have removed most of the crud, id be surprised if anything bad made its way to the rockers.


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Originally Posted by Doug P
Hey Guys,
Gary hasn't asked the question yet, but it has been mentioned before. On an A65 with the 3-hose oil manifold, is it okay to add the filter to the oil tank return line and leave the small line connected straight to the rocker arm infeed? Other than circulating "unfiltered" oil are there any other issues?
Thanks,
Doug
When I added a Norton filter adapter to my '71 A65 I blanked off the small pipe on the manifold and added a T connector in the return line to feed the rockers. I can't say how it would have performed had I used the original feed pipe.


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DavidP, good point! To filter the low percentage of oil going to the rockers, a tee after the filter and before returning to tank might be the solution. Regardless, any filtration when using detergent oils is going to extend the life of the notorious timing side bushing. Gary


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Originally Posted by Allan G
Originally Posted by kurt fischer
Originally Posted by Doug P
Hey Guys,
Gary hasn't asked the question yet, but it has been mentioned before. On an A65 with the 3-hose oil manifold, is it okay to add the filter to the oil tank return line and leave the small line connected straight to the rocker arm infeed? Other than circulating "unfiltered" oil are there any other issues?
Thanks,
Doug

That caused my '71 to empty the oil tank into the sump. Took about 10 miles, YMMV

... perhaps it was a bad filter or a one way filter piped up the wrong way?
If you have a sump cover with magnetic drain bolt fitted and it is a "strong" magnet and too close to the pickup, this can cause wet sumping.
...

Thanks, but no, none of that. Blocking the rocker feed at the oil junction pipe and fitting a T after the filter fixed the wet sumping. There was a long discussion here a few years ago when I was building the bike. As I said, your experience may differ.


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Originally Posted by do it twice Gary
Mark, What's the overall length of the filter? Do you think the map filter will fit into the toolbox, with maybe a little modifying? Nice installation. Gary

Sorry, I've been away from the forum for a while. I believe the filter would fit in the tool carrier, but you would have to cut out the lower end of the carrier for the fuel lines. I would have tried that but I've never had a tool carrier for this bike.

In case I didn't mention this above, the MAP filter takes the same elements as Rocket 3's and Tridents.


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Originally Posted by kurt fischer
Originally Posted by Doug P
Hey Guys,
Gary hasn't asked the question yet, but it has been mentioned before. On an A65 with the 3-hose oil manifold, is it okay to add the filter to the oil tank return line and leave the small line connected straight to the rocker arm infeed? Other than circulating "unfiltered" oil are there any other issues?
Thanks,
Doug

That caused my '71 to empty the oil tank into the sump. Took about 10 miles, YMMV


Why would that happen?

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Originally Posted by Piperdave
Originally Posted by kurt fischer
Originally Posted by Doug P
Hey Guys,
Gary hasn't asked the question yet, but it has been mentioned before. On an A65 with the 3-hose oil manifold, is it okay to add the filter to the oil tank return line and leave the small line connected straight to the rocker arm infeed? Other than circulating "unfiltered" oil are there any other issues?
Thanks,
Doug

That caused my '71 to empty the oil tank into the sump. Took about 10 miles, YMMV


Why would that happen?

Dave

To my benighted brain, the oil was taking the path of least resistance, feeding an excessive quantity of oil to the rockers, which then drained into the sump ... and vicious cycle.


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Kurt,…. “ … To my benighted brain, the oil was taking the path of least resistance, feeding an excessive quantity of oil to the rockers, which then drained into the sump ... and vicious cycle.”. That would be correct, and that is the reason to be sure the filter is a FullFlow, Read: easy to blow through, filter. The Emgo filter works OK on my ‘67, and I have tested others and used them also when not ordering Emgo.

30FE2386-AD1B-4D96-80E8-24A2F4FDB9FF.jpeg
Last edited by KC in S.B.; 10/29/22 3:21 pm.

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This begs the question for me of the best place in the oil circuit to place a third party filter. I was planning on putting it on the oil outlet from the tank, so that all oil that reaches the engine goes through it. That places it before the pump, and I can see some logic in having it in the higher pressure post-pump location. Where is the best place to put it?

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DO NOT PUT THE FILTER IN THE FEED LINE! DO PUT IT IN THE RETURN LINE! If there is a problem with the filter your engine won't be toast if it's in the return line. The oil will get plenty of filtering in the return line.

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On my OIF Bonneville I use the MAP filter. It hides nicely behind the TS rear engine mount plate. I must remove the side cover to replace the filter element. I also own a Trident, so both use the same filters. laugh
A full flow filter, but on the Triumph the rocker feed is after the filter anyway.


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All the abrasive bits are made in the engine so the return line will get them before they settle in your oil tank. Of course if you do not clean your oil tank after putting the filter on any debris in the tank can still go through the engine before it gets caught in the filter. There are remote filters with two outlets, one for the tank the other for the rockers with the correct size pipes.

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Originally Posted by DMadigan
……………. There are remote filters with two outlets, one for the tank the other for the rockers with the correct size pipes.

Interesting, Have never seen one of those.

Last edited by KC in S.B.; 10/30/22 10:37 pm.

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Since I purchased one of these "Norton" style add on filter assemblies, I started looking to cross reference full flow filters that are readily available at the local parts stores. I only come up with the non-stock variety like the Champion COF103101S. There should be more than a couple filters that will work. Maybe I'm not searching correctly. Gary


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"There are adapters (Colorado Norton Works sells one) that you screw onto the filter base, converting it to a regular 3/4"X16 thread, which gives all kinds of options for filters.


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Wix sells a filter made for Simca or Citreon 2cv cars with the correct thread. I used to be able to buy those at the O'Reilly main store in Nashville.
I can't remember the Wix number, but usually what was in the box was labeled Mann Filter W712/9.


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Originally Posted by KC in S.B.
Originally Posted by DMadigan
……………. There are remote filters with two outlets, one for the tank the other for the rockers with the correct size pipes.

Interesting, Have never seen one of those.
remote filter head

You can remove the blanking plugs and fit connection fittings. They come in many colours.


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On the several "Norton" type filter heads I have bought in the last few years take a K&N or Hiflo #153. This is a common Ducati filter easlily found online or in some auto parts stores


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Originally Posted by do it twice Gary
Since I purchased one of these "Norton" style add on filter assemblies, I started looking to cross reference full flow filters that are readily available at the local parts stores. I only come up with the non-stock variety like the Champion COF103101S. There should be more than a couple filters that will work. Maybe I'm not searching correctly. Gary


I have used this Champion filter, the WIX W7101 filter and the Bosch filter, as mentioned my bikes (and others who I ride with) have the filter on the return side and without disturbing the return line and never had a problem.

Filters should be free flowing, the rocker feed should have some pressure behind it, if there isn't then something isn't right. Though what KC said makes a lot of sense, if your filter isn't free flowing then this could cause problems


Life is stressful enough without getting upset over the little things...

Now lets all have a beer!

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OK....

given that the rocker feed on A65 is a smaller diameter than the tank return....would this work ok?

[Linked Image from i.ibb.co]

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Originally Posted by Piperdave
OK....
given that the rocker feed on A65 is a smaller diameter than the tank return....would this work ok? Dave

Sorry Dave, I just use the full flow filter and no other plumbing or mechanical flow restrictor adjustments, and it’s been working OK for me. Again, the Emgo filter is available and works. I’ve cut them open to inspect, and there is stuff caught in the paper. So as far as I can see, even at Full Flow, it’s worth the effort and doing some good.
Thanks for the link to that mount option, I see the web has so much stuff! The one shown is quite large and looks to be for a full size spin on filter, which isn’t desirable for Brit bikes. The Norton adapter works, and the Emgo filters work. Easy Peesy…

Last edited by KC in S.B.; 10/31/22 3:06 pm.

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That remote filter head uses AN-10 which is equivalent to 5/8".
Filter head can be machined for different number and pipe arrangements
[Linked Image from live.staticflickr.com]
HF116 filter used on H*nda, Husqvarna, Polaris
[Linked Image from live.staticflickr.com]

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For the Norton type spin on, Borg and Beck BFO4180 fits, easy to find on ebay.


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