I got a deal on a case of these and decided that I will only use 1-2 filters per year so I can cut one up. I'm pretty sure this filter fits all evolution engines and maybe the Twin-Cams too. I was shocked when I got it apart.
Filter: Harley Davidson Super Premium
Part #: Black 63731-99
As you can see, this has the typical butterfly type spring holding the filter up to the baseplate. There is a red/orange ADBV (silicone?). The filter material has a very large surface area considering the size of the filter. It is made from what looks to be a cotton like material with a wire core holding it together - seems much better than paper.
As you can see here, there are 7 small round intake holes with one larger one. Note the "AA" stamped on the base plate. I think this means "champion"?
Okay, here is the by-pass valve. It seems similar to the set-up in the Motorcraft FL-820s. THere are 10 inlet holes with a thin grey rubber seal. It is operated by a coil type spring in the top of the filter. I used a ball point pen to activate the by-pass valve and it seemed like it required alot of pressure to kick this into by-pass mode. The filter element is glued to the end caps with a large amount of brown glue.
Now this is were I get confused. I didn't look at this picture until after I took the filter apart. THere is no coil pring holding the filter, but a butterfly type spring, The by-pass valve is at the top, not the bottom of the filter. I much prefer the actual by-pass setup the the one on the box.
Overall, I am quite impressed with this filter. It seems to be a quality filter - still a bit over priced, but no more than an Amsoil filter.
[ November 22, 2003, 10:57 PM: Message edited by: medic ]
Filter: Harley Davidson Super Premium
Part #: Black 63731-99
As you can see, this has the typical butterfly type spring holding the filter up to the baseplate. There is a red/orange ADBV (silicone?). The filter material has a very large surface area considering the size of the filter. It is made from what looks to be a cotton like material with a wire core holding it together - seems much better than paper.
As you can see here, there are 7 small round intake holes with one larger one. Note the "AA" stamped on the base plate. I think this means "champion"?
Okay, here is the by-pass valve. It seems similar to the set-up in the Motorcraft FL-820s. THere are 10 inlet holes with a thin grey rubber seal. It is operated by a coil type spring in the top of the filter. I used a ball point pen to activate the by-pass valve and it seemed like it required alot of pressure to kick this into by-pass mode. The filter element is glued to the end caps with a large amount of brown glue.
Now this is were I get confused. I didn't look at this picture until after I took the filter apart. THere is no coil pring holding the filter, but a butterfly type spring, The by-pass valve is at the top, not the bottom of the filter. I much prefer the actual by-pass setup the the one on the box.
Overall, I am quite impressed with this filter. It seems to be a quality filter - still a bit over priced, but no more than an Amsoil filter.
[ November 22, 2003, 10:57 PM: Message edited by: medic ]