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Thread: Safari Snorkel Pre-Cleaner

  1. #31
    Join Date
    Nov 2005
    Location
    Salt Lake City, Utah
    Posts
    1,780
    I have the Donaldson 7inch precleaner on my Safari Snorkel. It's feeding air through a second Range Rover paper air filter then on to the Chev 350.

    NO problems in 4+ years, a lot of it highway driving.
    Michael Slade

  2. #32
    Join Date
    Jun 2007
    Location
    Charlotte, North Carolina, United States
    Posts
    1,625
    I've had a donaldson for years that I hand carried back from australia. It's was originally on my Disco I and now it's on my D110. works very well on the petrol Disco and the Diesel 110, with plenty of highway driving over 70 with no perceived loss of power.

    Just driving around Charlotte for 6 months caked the inside of it.

    When I was in Iraq, all of our HUMVEE's had donaldson's on them too. Same one I have, only bigger. Must have been a 10".
    Mark
    Land Rover NAS 110 #234, 2.8 TGV Turbo Diesel
    HAM Tecnician call sign: KM4BOR
    Chronically suffering from wanderlust...
    My Land Rover Profile: http://www.defendersource.com/forum/...ad.php?t=35729

  3. #33
    Join Date
    Aug 2007
    Location
    Flagstaff, AZ
    Posts
    1,219
    What no analytical types in the group?

    Prefilters have a minimum air flow needed to work properly and a maximum air flow beyond which the prefilter starts to restrict the flow. The trick is to look at the RPM range you actually use then pick a prefilter that can handle that air flow.

    How do you do that?

    simple if you use this handy dandy formula:



    Now, my 302 engine is at 2650 RPM at 65 MPH and almost never sees more than 3000 RPM at shift points.

    So running the numbers, the 302 pumps 131 CFM @ 2000 RPM and 197 CFM @ 3000 RPM. Looking at the specs for Donaldson top spin prefilters, the H002425 has an operating range of 90 CFM to 200 CFM, and fits a 3" dia snorkel tube & has a 7 inch dia body. That would basically cover the 302 V8 from low RPM rock crawling through 75 MPH without restricting air flow.

    Those larger 10" diameter prefilters some people mentioned don't work properly below 200 CFM (At least the Donaldson ones). I'd have the keep my V8's revs above 3200 PM just to get the prefilter to start working properly.

    How hard can it be to chose the right size precleaner for an engine?
    TeriAnn

    Signed copies now available through the book's web site:
    The Essential Guide to
    Overland Travel
    In The United States and Canada


    2 years to write and 38 years of travel and camping to learn what to write
    The world beckons and life waits for no one

    My Land Rover web site

  4. #34
    Join Date
    Jan 2007
    Location
    MONTANA
    Posts
    265
    I ilke teri ann's approach sounds simpler and cheaper than mine over the years....bolt on said part then modify untill it cost twice as much as new till it dosnt work as intended any more.....then start over.


  5. #35
    Join Date
    Jun 2007
    Location
    Charlotte, North Carolina, United States
    Posts
    1,625
    Quote Originally Posted by TeriAnn
    What no analytical types in the group?

    Prefilters have a minimum air flow needed to work properly and a maximum air flow beyond which the prefilter starts to restrict the flow. The trick is to look at the RPM range you actually use then pick a prefilter that can handle that air flow.

    How do you do that?

    simple if you use this handy dandy formula:



    Now, my 302 engine is at 2650 RPM at 65 MPH and almost never sees more than 3000 RPM at shift points.

    So running the numbers, the 302 pumps 131 CFM @ 2000 RPM and 197 CFM @ 3000 RPM. Looking at the specs for Donaldson top spin prefilters, the H002425 has an operating range of 90 CFM to 200 CFM, and fits a 3" dia snorkel tube & has a 7 inch dia body. That would basically cover the 302 V8 from low RPM rock crawling through 75 MPH without restricting air flow.

    Those larger 10" diameter prefilters some people mentioned don't work properly below 200 CFM (At least the Donaldson ones). I'd have the keep my V8's revs above 3200 PM just to get the prefilter to start working properly.

    How hard can it be to chose the right size precleaner for an engine?
    Finally! A mathmatical validation that bigger isn't always better!
    Mark
    Land Rover NAS 110 #234, 2.8 TGV Turbo Diesel
    HAM Tecnician call sign: KM4BOR
    Chronically suffering from wanderlust...
    My Land Rover Profile: http://www.defendersource.com/forum/...ad.php?t=35729

  6. #36
    Join Date
    Jul 2006
    Location
    Forest Falls, CA
    Posts
    8,488
    I was driving home tonight with my passenger window down (rarely drive with the windows down).. and damn that thing sucks! literally.. sounds like a hoover! I never noticed it with the windows up.
    Dave & Yoshi
    The Adventure Duo
    2003 Sportsmobile EB 7.3 PSD
    1997 Landcruiser 80 Series Collectors Edition
    2005 Suzuki DRZ400s
    Tread Lightly! Trainer | Manufacturer of the Trasharoo

  7. #37
    Join Date
    Aug 2007
    Location
    Flagstaff, AZ
    Posts
    1,219
    Quote Originally Posted by big sky trapper
    I ilke teri ann's approach sounds simpler and cheaper than mine over the years....bolt on said part then modify untill it cost twice as much as new till it dosnt work as intended any more.....then start over.
    My typical analytical approach is very time consuming and would drive many people crazy:

    1. Identify the problem

    2. research the problem to try to learn its parameters and potential gottchas.

    3. research existing solutions that others have used for similar problems, how well those worked and what off the shelf solutions are available.

    4. Compare my problem to the problems others found solutions for to identify those solutions which are most applicable.

    5. Run a comparative study of existing solutions to identify best ideas that are most applicable to my own problem.

    6. synthesize a best solution for my particular problem from the best ideas previously researched.

    7. Create a clear plan of implementation

    8. Implement

    9. chase down assorted gremlins and teething problems

    10. have a nice cuppa tea & enjoy.

    11. refine everything so it works even better.


    Very slow. It took me over 2 years to decide how I wanted to convert my Land Rover regular into a long range expedition vehicle and about 6 months to repair, refurbish & install a Dormobile kit, design & fabricate additional furniture, design a 15 gallon water tank, filler & filter system, fabricate the parts & install it, set up a built in 5 gallon propane system, add a second battery and rear electrics, have the vehicle painted and an all new interior, convert to a Salisbury (Dana 60) rear axle assembly with ARB air locker, add a automatic torque biasing diff up front plus a few other odds & ends.

    I immediately tested everything with a 3 month long camping trip.

    When I decided I needed additional power to haul my RV around, I spent a year exploring engine & gearbox combinations that could fit into a Series Land Rover, installation & operational cost numbers of promising solutions, collecting gear ratios, running possible gear ratios and estimating their affects on performance & fuel economy. Then after a year of research, in a tad over a month, my Land Rover went from a 2.25L four cylinder engine optimistically rated at 70 hp to a 1970 Ford 302 V8 with Borg Warner T-18 gearbox, Series Land Rover transfer case (one of the strongest transfer cases available) with Ashcroft high ratio kit (increases high range gears while leaving low range alone). An unexpected bonus added at the last moment for additional interior space was power steering. Always keep an eye out for serendipity, she is your friend.

    Being saddled with an analytical mind means not doing anything quickly. For the longest time it looks like you are doing absolutely nothing other than poking around looking at things & asking weird questions. And you are always collecting specifications and performance data. A lot of people do not have the patience to put up with someone who has an analytical mind.

    It also means that one should have supporting data available before one says "Good morning". An offering of a nice hot cuppa tea and a warm smile also helps back up the supporting data.

    TeriAnn

    Signed copies now available through the book's web site:
    The Essential Guide to
    Overland Travel
    In The United States and Canada


    2 years to write and 38 years of travel and camping to learn what to write
    The world beckons and life waits for no one

    My Land Rover web site

  8. #38
    Join Date
    Jul 2006
    Location
    Forest Falls, CA
    Posts
    8,488
    This is what the pre-cleaner has picked up in the last month just from being on the street. **We have not been offroad at all with it yet

    Im impressed.

    Dave & Yoshi
    The Adventure Duo
    2003 Sportsmobile EB 7.3 PSD
    1997 Landcruiser 80 Series Collectors Edition
    2005 Suzuki DRZ400s
    Tread Lightly! Trainer | Manufacturer of the Trasharoo

  9. #39
    Join Date
    Mar 2007
    Location
    The Nanny State
    Posts
    5,770
    Then there is the approach that looks very, very similar to TeriAnn's, only getting something done takes 3x-10x longer. If it gets done at all. Which is more commonly the case. Witness my yard.......

    It's known as "Analysis Paralysis".
    (Term was coined by a fellow over on ck5.com)
    semi self-banned

  10. #40
    Join Date
    Sep 2007
    Location
    St. Petersburg, FL
    Posts
    456
    Will the 7" Safari PreCleaner fit a 3" Mantec pipe? Couldn't find the dimensions anywhere on the neck of the precleaner. Thanks.
    telwyn
    1982 Land Rover Lightweight
    2006 Range Rover Sport
    1967 m416 trailer

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