| Author | Message | ||
     Buelleaver |
My x1 has a oil pressure gage and I’ve been using amsoil filters. Just switch back to factor filter and can see a difference in oil pressure. Same oil. With the amsoil filter the gage would jump right in time with the tach. With the stock filter the oil pressure seems to lag slightly behind. Also seems to run at least 5-10 psi less at any given rpm over 3000 with the hd filter. Idle is about the same. Since the pressure is measured after the oil leaves the filter it seems the stock filter is a lot more restrictive then the amsoil filter. May not mean much, but I was wondering if anyone else noticed a difference with different filters? The extra psi will circulate the oil quicker which should help cooling. Plus at speed it’s reassuring to see lots of oil pressure. | ||
| Sloppy |
A few thoughts: Typically a filter that gives a greater restriction to flow also gives you better filtration. This is the crux of the paper air filter vs. K&N filter debate. So while you may be getting more flow, it will be with less filtration protection (unless you have greater filtration surface area). So open up the two filters and find out... Pressure readings will definitely be oil temperature dependent so measure oil temperature at the same time you're taking the pressure measurement. HD engines use roller bearings for the crank so the oil lubrication requirements are significantly less than on other plain bearing engines. HD engines use a 2 - stroke type crank and think about how little lubrication a 2 stroke crankcase gets! Plain bearings require 100 to 1000 times larger film thickness to provide the protection required that a roller bearing offers. The extra oil you flow may not give any benefit except for increased windage. Greater circulation of oil also means greater parasitic drag taken up by the oil pump. The XL engine doesn't have chronic oil temperature / cooling issues. Since the XB has oil cooling injectors for the pistons, the XB engine does require an oil cooler. But XL's don't require an oil cooler - sufficient heat is transferred via the engine. Interesting data you've obtained - I'm curious if you can compare at what oil temperatures you got the data and compare the surface area of both filters. | ||
| Kalali |
Sloppy, as always, great write up. Thanks. | ||
| Buellistic |
BUELLers: DO NOT GET TO HIGH A MICRON OIL FILTER !!! Number of years ago HARLEY-DAVIDSON came out with a TOO HIGH A MICRON FILTER and when installed on SPORTSTER engines , caused the OIL PRESSURE LITE to come on(means you are loosing oil pressure !!!) ... HINT: "i" have been running WAL-MART SuperTech oil filters for years now(they do the job and do not cost a arm and leg) ... Have 107,444.7 miles on my 1997 S3T as of the last ride if that says anything for the WAL-MART FILTERS ... MAY THE LONG LASTING BUELL BE WITH YOU !!! | ||
| Lowroad |
Buellistic, are you using the wal-mart ford F-150 equivalent filter? | ||
| Buelleaver |
Temperature does play a role in pressure. I can see a lot more pressure when I rev the engine cold vs. hot. I don’t have a temperature gage so I can’t compare beyond that. But the difference is noticeable with both cold and warm motor. Amsoil filter is not paper.It’s some kind of synthetic fiber, so it’s hard to compare surface area. I know extra psi will add resistance and all, but in this case wouldn’t it be the filter that is returning the lowest pressure be the one that is adding the most parasitic drag by placing more resistance on the pump? I base that thought on the sightly delayed gage response. 107,000+ miles must be the record around here. (Message edited by buelleaver on May 03, 2009) (Message edited by buelleaver on May 03, 2009) | ||
| Kalali |
I don't have a gage on my bike but both of my cars have oil pressure gages. The temp clearly makes a huge difference in the pressure but I have also noticed different brands of oil (mineral with identical viscosity) also make a difference for a given temp. Not sure why but they do. Valvoline 20-50 Racing Formula gives the highest pressure. Can't speak for synthetics. | ||
| Eshardball |
I have a temperature gauge on my S1 and use the Purolator Pure One filter that had the best test results from an independent analysis that was posted here some time ago. The Pure One was found to have a really good grade of synthetic media and more of it than the Amsoil filter did at much less money.The only draw back is the yellow paint job but a can of Krylon can fix that. My OP gauge is pegged when cold and then comes back to about 13lbs@idle once the engine heats up. I had bad experience with Valvoline foaming in both of my Ironheads and now just run the Amsoil or Mobil One. Just my .02 | ||
| Eshardball |
My bad. I meant oil pressure gauge | ||
| Oldog |
The K&N shows high back pressure when the oil is cold ( higher than stock ), I have to believe that the oil is not getting thru the media and that is the cause of higher pressure, this engine is Roller Bearing, its about flow of clean oil, all plain bearings in the motor, are splash lubed I have installed the last and only K&N Oil filter on the machine. I will use stock as the engine was designed and tested with that filter and it is known to work well with it, BTW with 39K on the clock what I have seen of the mill's innards look quite good, so stock filter and Mobile 1 for 'ol blue |
