Kinsler_Handbook_#32 December 2017

190 Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. Phone (248) 362-1145 Fax (248) 362-1032 AIR FILTRATION - FILTER FOAM Excellent for protecting racing and high performance engines from dirt in the air. This open cell polyurethane material is easily cleaned for reuse. Sold in bulk, allowing you to con- struct the most suitable filter for your application, while it is less expensive than other filter systems. The finished element consists of three layers. The hardware mesh gives structural strength. The metallic window screen is sandwiched between the mesh and the foam to serve as a flame arrestor, TO PROTECT THE FOAM IN CASE OF A BACKFIRE! The filter foam sits on the outside of the screen. Filter foam butt seams can be made by applying five minute epoxy to the edges, then holding them until the glue sets. Make the foam element slightly smaller than the mesh support, so it will fit over with a stretch fit. FILTER SYSTEM CONSTRUCTION Use a large area of foam to insure maximum air flow through the filter, while increasing its capacity to hold dirt without becoming restrictive. We recommend the use of an air box type filter that covers all the ramtubes. When each ramtube takes it’s “gulp” of air, it will have the entire area of foam to draw air through. The foam would have to be extremely dirty before any appreciable restriction would occur. The air box system does not require rem oving the ramtube bells, like some individual air cleaners d o. The bells should NOT be removed, as thi s causes appreciable power loss at high engine speeds. ADVANTAGES OVER INDIVIDUAL AIR CLEANERS Using an individual air cleaner on each ramtube, can seri- ously lower power output. This is because each cylinder is drawing in air only about 30% of the time, and when it does, it takes a very fast “gulp”. This instantaneous flow rate is very high, and individual air cleaners have a small area, so they can be restrictive. A small amount of dirt can cause an even greater loss in air flow. #5021 5010 Green, 65 pores per inch. For air with very fine dirt. Roll: 12" wide x 4' 10" long x 1/2" thick 5015 Grey, 45 pores per inch. For air with medium dirt. Roll: 12" wide x 6' 8" long x 1/2" thick 5020 Set of (8) Nozzle Vent Filter Bisciuts (NVFB), to protect the air orifice on constant flow nozzles from dirt, 45 PPI 5021 Individual Nozzle Vent Filter Biscuit, EACH Hardware Mesh 1/4” openings Metallic window screen Filter foam © 2017 A filter that has adequate filtering area when it is new (clean) may not once it traps a fair amount of dirt. It is smart to make the filter a minimum of 20% larger to compensate for this... the bigger the better. EXAMPLE : 427 X 7500 25,500 = 126 Square Inches of Filter Area minimum . A 11 1/4” X 11 1/4” square is 126.5 square inches. A 9” X 13 1/4” is 121.5 square inches. A 12” X 12” is 144.0 square inches ( one square foot ). Reference : CID = Cubic Inch of Engine Displacement RPM = RPM of engine at max. power A = Effective area in square inches of filter SIZE FORMULA : Gives approximate mini- mum filter surface area needed. CID X RPM 25,500 = A