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Hi Bill, The plastic thing with holes is the injector "diffuser" designed to break up and better atomize the fuel from the injector. There should be a slight indentation near the top (end with the big hole where the injectors sits) on one side. This indentation should match a similar key in the injector hole in the block. Take a flash light and peek inside the injector hole in the block. Insert the plastic injector diffuser such that the two keys line up - can be a bit tricky to get it to seat properly. I find sticking my finger down into the end of the diffuser while it is in the block and twisting it a bit helps. It may look like its seated, but when its really seated its a ways down into the block. The end with hole stays out - so the injector nose can be inserted. Made certain you seat this diffuser (if you are going to use it - not essential but recommended) properly or else when you try to tighten the bolts which hold the fuel rail onto the injectors you could break the diffuser or damaged the plastic cover (over the injector pintel) on the bottom of the injector. As best I recall the angled plate of the diffuser should deflect the stream of fuel toward the intake port (into the combustion chamber), provided you have the keys lined up. Then the injector with its "O" ring is inserted. The nose of the injector should go into the injector diffuser but the "O" ring should rest on its top. Hope this helps. Ed A ----- Original Message ----- From: "William" <wschertz@ispwest.com> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Friday, September 16, 2005 9:53 AM Subject: [FlyRotary] Primary Injectors installation Need some guidance/help on what goes on with the primary injectors. They are installed in the cast iron center housing, and in the parts I received from Bruce T. there is a plastic device that looks like a small plug with many small holes in two plates, one at an angle and the other normal to the flow. Does this plastic part go into the injector recess, how about the rubber 'donut' that came on the injectors, seems a loose fit inthe holes. I haven't seen any information on how these install in the primary injector holes. Thanks Bill Schertz KIS Cruiser -------------------------------------------------------------------------------- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/