Oil Filtration
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Cruiser
Joined: Feb 2013
Posts: 149
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From: Indiana
Oil Filtration
In Donny Peterson's "Unauthorized Technical Guide to Harley Davidson 1936-2008 Volume I: The Twin Cam" on page 42 he states that the Evo oil filtration is designed to filter particles as small as 30 microns ( a great improvement over the earlier shovel and pan systems). He then states that the twinkee filters particles as small as 10 microns. Interesting fact per Donny is the twinkke filters oil before the oil enters the engine whereas our beloved evo's 
filter the oil after it comes out of the engine.
My question and discussion point is: If I ask for a filter at the HD store for my 95 evo RK, will they give me a different part number than for a twinkee filter?
As a sidenote, I have noticed a independent shop using the same K&N filter for both.
filter the oil after it comes out of the engine.My question and discussion point is: If I ask for a filter at the HD store for my 95 evo RK, will they give me a different part number than for a twinkee filter?
As a sidenote, I have noticed a independent shop using the same K&N filter for both.
Outstanding HDF Member
Joined: Jul 2013
Posts: 2,874
Likes: 36
From: Houston, TX
The twinkie filter is a 5 micron filter....
To be totally honest though, it probably shouldn't matter. Use a standard HD chrome filter, or one of the following
Wix 51215
Wix 51225
Napa 1215
Napa 1225
Mobil-1 M1-102.
There are a bunch of others that will work fine but I don't remember the number.
To be totally honest though, it probably shouldn't matter. Use a standard HD chrome filter, or one of the following
Wix 51215
Wix 51225
Napa 1215
Napa 1225
Mobil-1 M1-102.
There are a bunch of others that will work fine but I don't remember the number.
Road Warrior
Joined: Apr 2007
Posts: 1,952
Likes: 15
From: Senoia, Ga., by way of Miami, Fl..
If you use the 5mi on the Evo, you'll end up trapping your oil in the head, starving the bottom end.. Take it for what you will, but I'm not going to do it. I think its a very bad idea..
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
We had a long debate about this some while ago. There are two filters for a jolly good reason - whatever that is! Use the correct one and ignore 'experts' who reckon there is a better way.
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Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
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From: la la land jerzey
the difference is in the gearing - the evo still has an oil pump gear set designed at the turn of the century, and it does not have the ability to over come the high return resistance in the twinkie filter - so the load on the evo oil pump is 10 times what is was designed for
evo has 4 straight cut gears driving each other < harley did that in 1917
twinkie is a gerotor pump < like what is in an automatic transmission - much high operating pressures with less drag on the engine
evo has 4 straight cut gears driving each other < harley did that in 1917
twinkie is a gerotor pump < like what is in an automatic transmission - much high operating pressures with less drag on the engine
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Tourer
Joined: Apr 2010
Posts: 297
Likes: 150
From: Florida Space Coast
Here's a video about how to evaluate oil filters:
http://www.machinerylubrication.com/...-filtersompare
http://www.machinerylubrication.com/...-filtersompare
Cruiser
Joined: Sep 2008
Posts: 185
Likes: 0
From: North Myrtle Beach, SC
the difference is in the gearing - the evo still has an oil pump gear set designed at the turn of the century, and it does not have the ability to over come the high return resistance in the twinkie filter - so the load on the evo oil pump is 10 times what is was designed for
evo has 4 straight cut gears driving each other < harley did that in 1917
twinkie is a gerotor pump < like what is in an automatic transmission - much high operating pressures with less drag on the engine
evo has 4 straight cut gears driving each other < harley did that in 1917
twinkie is a gerotor pump < like what is in an automatic transmission - much high operating pressures with less drag on the engine
Here's a video about how to evaluate oil filters:
http://www.machinerylubrication.com/...-filtersompare
http://www.machinerylubrication.com/...-filtersompare