[SkyKing]

Well I usually try and cross check parts that I put on my bike but...

When I bought the K&N's for the Evo I think I only asked for the appropriate filter for the Evo. Knowing that the TC88 uses a different HD filter, I checked and saw it did indeed call for a different K&N part no. Not checking to see what I had on my worbench shelf I ordered a few K&N oil filters for my wife's TC88 powered Heritage. When I received them and put them on the worbench with the other filters I discovered that they were the same as I had been using on my Evo powered custom ST. I went back to check the K&N part number for the Evo, and sure enough, it was different than the one I have been running. So my question is...Is there a problem running (hope not after 10,000 miles) the TC88 oil filter on the Evo? I like the new icons. Keep up the good work.

[kenfuzed]

The difference is the EVO uses a 10 micron filter and the TC88 uses a 5 micron filter. Now before you start thinking that the smaller 5 micron filter will filter better on an EVO, STOP! The EVO motor uses the filter AFTER oil has circulated the motor on the retun side to the oil tank, whereas the TC88 has it's filter located before running the oil through the engine. If you run a TC filter on an EVO, you could restrict flow back to the tank, thus causing starvation on the inbound side and wet-sumping within the crankcase. I know lots of guys run these filters, but I wouldn't do it. Oil is your engines life blood. Starve it and your engine will suffer.

Not exactly sure, but the pressure rating on the internal bypass I believe may be different too, so if you put too much pressure on the filter it could in turn bypass the filter process and defeat the whole purpose. Same goes for the opposite, not enough pressure will not engage the bypass and cause back pressure when the filter clogs.

Bottom line, use the recommended filter for it's intended purpose and you'll never have to worry.

[ReeseSS]

Hmmmmmmmm... pretty sure the evo filter is a 30 micron, early TC's like 99's to 04 maybe were 10, important part is get the right filter

[kenfuzed]

Thanks, you're right, 30 on the evos and 10 on the Twinkie. Must have been a long day, but I can always count on Reese to set me straight

[SkyKing]

Thanks for the input, guys. I've since changed out to an Evo filter. Now what to do with a dozen TC filters? My wife will have to do lot of riding. I guess I can give my Buds a deal on their oil changes. Hope no damage was done.

[kenfuzed]

Originally Posted by SkyKing

Thanks for the input, guys. I've since changed out to an Evo filter. Now what to do with a dozen TC filters? My wife will have to do lot of riding. I guess I can give my Buds a deal on their oil changes. Hope no damage was done.

You could always trade them with others here for Evo filters or other stuff. Otherwise, its good to know that filters last forever so just think of it as a life-time supply.

[Seahag]

Originally Posted by kenfuzed

Thanks, you're right, 30 on the evos and 10 on the Twinkie. Must have been a long day, but I can always count on Reese to set me straight

Correct...and now 5 microns on the newer Twin Cam filters....which I believe came out a year and a half ago. I'm pretty sure you can't even get the 10 micron HD filters anymore.

[REED]

I will add this what the micron range of the filter is may not be too critical 90% of the oil entering the filter flows down ther length of the filter before making a u turn and exiting 5through the bypass back into the engine the strength of the bypass spring may be too strong so that your EVO idling at 700 RPM may only generate 4 to 5 pounds of pressure and if so will not bypass any oil through the bypass and since the oil cannot readily flow through the paperthe engine will starve for oil especially at an idle. Paper element in the filter just does not have the capacity to flow much oil through the media, the finer the micron filter the more oil likely can't get through the paper media and returns unfiltered through the bypass. Just cut a new filter apart and tear out a chunk of the pleated paper element. We can all agree that air is finer than oil right, just place that brand new media over your mouth and try to take a deep breath through it, you can't right so how the hell do you think the 2 to 3 gallon flow per minute your bike has just off idle will ever make it through that I would like to know. Want the best check out the filters at gopurepower.com. I am a mechanic and believe me when I found these I now have them on both my HOG and my KENWORTH. They are not cheap but look after it correctly and you will never have to buy another. I will suggest that you buy an extra filter media it makes it much simpler to do changes if you have a spare media and clean the extra in the dishwasher or just plain soap and water as it takes a while to dry then keep it at the ready in a clean ziplock bag till you are due for the next oil change.
Tom