The longer filter was introduced for dynas, as the relocated sump provided a smaller oil carrying capacity. It has nothing to do with filtration.
Of course you could use the same long series on any evo that it can physically fit onto.
Oiling systems and filters need to be matched.
Installing a 5 micron filter onto an engine that has a pump designed to be matched with a 35 micron filter is clearly a bad idea. A key element here is that the 5 micron filter is intended for systems that filter on the feed side, not the return.
The by-pass filter has nothing to do with it.
Naturally, it has to have a higher release point, as it is on the feed side, and it would be open all the time otherwise. But that does not make it the reason why you should not run that filter on an evo. Far from it. That is merely a side dynamic. The primary concern is the matching of oil pump pressure and flow characteristics to the filtration medium.
This is obvious, as in a correctly functioning system, the bypass valve is never called upon, WHEREAS THE FILTRATION MEDIUM IS OPERATING CONSTANTLY.

 

why dynas use long filters
because they can
the part number for our filter is 63813-90
been buying them for 16 years

 

dealer parts guy told me the long filter was used to help keep the stator plug in place.

 

If you are serious, and he was as well, shop elsewhere.

 

I am serious. That's what he said when they were out of the long filter and I asked about the short one. Seems reasonable to me since there is no clip or anything to keep it in place and the filter pushes on it slightly.

 

It is confusing. My 99 EVO manual calls for the high filtration filter, the same one listed for the twin cams. And, HD recomends that same filter for the older ones as an upgrade. I am now using the old style low filtration filter on mine. I have used the high filtration filter without problems, but after reading all the info here, I will continue to use the low filtration filter. I change oil at about 2,500 miles on average anyway.

 

I've got a fatboy, so the filter is out in front of motor. I run the short filter in the cooler months, and the long filter in the summer, as I think it helps cool the oil.

 

That IS confusing! Perhaps Harley upgraded the later Evos to a similar spec oil system to the TC one? They made both engines at the same time for a while. I wonder if there is a way you can confirm that, such as at a local dealer, with your VIN?

 

No the oiling system is the same. Put twinky filters on twinkies, evo filters on evo's and be wary of auto filters!!!!!!!

 

I have a 98 superglide I tell them the year and they give me the short one and I tell them the long one. I just thought the new ones and the old ones were the same The stealers probably are giving me any one Do you know the part number for the 98 Thanks