From: Ernest Christley <echristley@att.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, August 5, 2011 9:05 AM
Subject: [FlyRotary] Ideas for direct injection

I'm struggling here on which way to go, so I'm hoping maybe you guys can help me sort it out.

My problem is that when building my intake, I pointed the injectors the wrong way.  My poor thinking was that it would allow the fuel to vaporize better.  It was a nice theory to mull over while petting my unicorn.  In practice, all it does is allow fuel to pool in and cause condensation to form on the manifold.  I have to fix it, but I'm torn on how.

1) Direct injection.  On the 13B housings, the oil injector port looks like a good place to install the injectors.  The issue is that the hole to the chamber is very small.  I'm thinking I would have to drill it out to get a spray into the chamber, and I can't think of any safe way of doing that except to completely disassemble the engine (Ugh!).  There is a  brass fitting at the bottom of the oil injector hole that looks like a carb jet.  It tried to screw it out, but the thing won't budge at all.  The other issue is bolting the injectors down.  The inside diameter of the screw thread of the oil injector hole is .007 less than the outside diameter of the stock 460cc injectors without the plastic cover on the tip.  I thought about using a die to put threads on the injector tip and screwing it in.  The injector's plastic tip has a recess which would provide a nice seat for an O-ring, but .007 doesn't give a lot of bite.

So the two issues with direct injection are a)how do I open the oil injection hole up without disassembling the engine or getting swarf in the chamber and b) how do I secure the injector.

2) Build a whole new manifold.  Does anyone have a spare 6-port manifold that I can cut the flange off of?

2) Cut up my current composite manifold up and move the injector placement.  I've already made a couple of "adjustments", so this thing is already getting ugly.

--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:  http://mail.lancaironline.net:81/lists/flyrotary/List.html