Posted by NCWayne on February 24, 2010 at 01:36:33 from (166.82.79.195):
I just saw the thread below where you were looking for an air filter housing/assembly. Before you go getting the filter from Surplus center you need to figure the CFM requirement of your engine. Better yet give Donaldson a call and see what they recommend. I see where one post did a CFM calculation for your engine but, unless I missed something, it was for a normally aspirated engine. Since a turboed engine uses more air than a naturally aspirated one the CFM calculations have a multiplier to cmpensate for that fact. I can't recall exactly what it is at the moment but it does make a difference. One thing I do know for certain is that if you restrict the inlet flow the life expectancy of the turbo is greatly diminished. What happens is that it is trying so hard to suck the air through the filter that it adds an excessive thrust load to the bearings. As an example hold your hand over the end of a vacuum hose. The smaller you make the hole the harder it pulls against your hand and the same goes for the turbo, the harder it sucks the more pull/thrust is created by the impeller wheelcreating excess heat as well as premature wear on the bearings.
Here is a link to Donaldsons web site where you can look for a housing using alot of different variables from the rated CFM to the inlet and outlet size. Suprisingly enough you can get housings with the same diameter openings but with widely different ratings, I guess all due to the design of the housing and the way it makes the air flow through it. If you find what you want there you should be able to order one through a distributor. I've bought several from them over the years for various pieces of equipment and the cost isn't as bad as you'd think.
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