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THIS THREAD got swooped up in the recent archiving and wanted to see if anyone wanted to continue the discussion so below is my last post in that thread: Quote: You'll might want to read the following thread completely: Popperboy1's filter minder tests Also, check out Terry's bio in his profile  ... He owes me some diesel blackboard training when I'm his neck of the woods next month  so that's why the plug here J/KLarry |
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Thanks Larry. I was enjoying this thread. Glad you brought it back. Mike Quote: |
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Well, with the ZooDad fix installed I check it more frequently. Now that I no longer reside in Virginia "The land of a million bugs". I just have to look for a lot of dirt. Yes, I run a K&N. No, I do not have a trace of dust in the intake tubes. So, I just pound out the small scorpions, lizards, pine cones and an occassional small squirrel. Chet |
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Quote: Hey Chet, LOL ... them things can live up in that rarefied Utah air  ... what you feed'in them squirrals 
Glad you're settled in
Larry Edited by Larry M (07/05/03 08:40 PM) |
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O.K. not being one to guess too much I decided to actually measure the graduations on my factory filter minder. This is something everyone can do in under 15min and that includes making you own water manometer. The following two links basically explain what this is and is an extremely accuate pressure/vacuum measuring device. Manometer 1 Manometer 2 What I did was take some clear tubing about 5' long and bent it forming a U at the bottom and using duct tape taped it at the top and then in the middle. Next fill the tubing where you have like 15 to 20" of fluid in each vertical section much like the blue colored water in the second link above. The attach a T to one end of the clear tubing with one branch of the T going to your filter minder (I simply held the tubing as tight as I could over the sensing hole in the filter minder ... absolute seals while nice shouldn't effect the measurements much since we're dealing with very small vacuums) I also took the top of my filter box off my Van to do this, but it can also be done on the vehicle. Attach another section of tubing to the T which will be the vacuum source which in this case will be YOU  . Tape the clear U tubing to a yard stick and with it vertical note the reading of the two level columns of water. Now while holding one end of the tubing attached to the T over the filter minder opening suck very gently and evenly on the tubing on other portion of the T and observe the reading on the filter minder for the 25, 50, 75 and change filter levels and note how high the water column rises in the end of the U tubing attached to the T. The height difference from the point where the two columns of water were equal and the increased height is equal to 1/2 of the inH20 of vacuum so multiply that by two and DONE. I did this like four times for each graduation on my filter minder and averaged the closest three and came up with the following:
25% filter minder reading = 12 inH20 50% filter minder reading = 16 inH20 75% filter minder reading = 22 inH20 max filter minder reading = 27 inH20 I also noted that it took very, very little suction(probably less than taking a good swig of your favorite beverage thru a regular straw) to get the filter minder to move off the zero position so mine is very sensitive. This also tells me that I might need a "real gauge from like 0 to 25/30 inH20 to really get some good readings on filter restrictions on my Van. Only drawback in this is that it will take two people to do this, but the wife was more than willing to help 
Don't guess ... measure and test
Larry |
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Larry, Check out the filter restriction gauge that SP Diesel offers http://mywebpages.comcast.net/spdiesel/intake_kit.htm. This is the same guage many big rig folks use in there trucks to monitor there trucks air filter status. The gauge reads from zero to 25 inh20 and it has a ratchet mechanism that makes it hold at the max level. I have this gauge hooked up to my truck with an SP Intake and I read approximatley 15inH20 at max boost. Intersetingly enough when the gauge was put on Wexman's stock truck with a brand new stock paper filter it pegged the restriction gauge showing over 27 inH20 of restriction. I will be changing my filter when my restriction gauge shows 20inH20 restriction. With over 50k on my current filter it looks like I might go close to another 50k before I need a filter change. 
Edited by PSDHokie (07/06/03 09:51 PM) |
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PSDHokie, Good info , bad link  Chris |
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Yeah cool vacuum gauge. Hmmm another gauge job in my future hehe. The problem with the stock filter is that as the filter becomes restrictive the inadequate filter-box allows bypass air in around the filter seal. Most of the dusted engine stories involve a restrictive filter and leaking stock box. My stock filter minder never registered any restriction at all after 15k miles of desert driving with 2 moths and a pebble lodged in the filter along with all the dirt. So the stock system never really has a chance to allow the filter be all that efficient. Best to have a good look at it and change it on the short-side of the suggested interval. To suggest otherwise is really slightly irresponsible. A Clean Filter is Good. Now if you have a good vac guage and a good sealing filter-box then you can get more mileage out of the same filter. I hope the AIS box seals a little better than the stock box. It looks like it will. Scott |
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Brad, Thanks and since I plan to install vacuum gauges on both my intake and pre pump fuel system, I'm presently leaning towards a pair of Ashcroft 1490 gauges HERE. That gauge offered by spdiesel looks good, but I would rather have something with a little finer resolution and like the 270 deg sweep of the Ashcroft 1490 series . I'm looking at the 0 to 30 inH20 for the air and probably 0 to 60 inH20 for the fuel. Problem is deciding what size and what type of gauge connections I want since I've just about run out of room inside my Van for any more gauges. I might install them on the cowling on my Van outside like I did my mechanical fuel pressure gauge on old gasser Van. I'm also not a big fan of running any mechanical gauge except a Vacuum one inside the Cab of a vehicle w/o an isolation diaphragm and then that gets a little pricey just like going to an electrical gauge. Decisions, Decisions  Regarding what you see at max boost of course that will varying depending on performance mods, but on my Van I have never seen the filter minder move, but I think the air system on the Vans might be more efficient than the F-series since I think I've heard that a stock F-series air setup can hit the 20's inH20 at WOT something I don't see in my Van. Larry |
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Check your air filter ... Con't
Re: Check your air filter ... Con't
