Hi Guys,
An installation update.
Most of my time so far has been spent with the switch to the AeroInjector. I finished up the air box:
I installed a small piece of backing and drilled and tapped for the inlet air temperature sensor. Since I can’t safety wire the AeroInjector I made the spigot hose, air filter, and AeroInjector stackup equal the height of the air box and made allowance to safety wire the air box to the induction tube. I also “walked around” the induction tube, where I cut the flange off, with a crescent wrench and flared it just a tad. The new silicone spigot Sonex provides holds nicely.
BTW, the initial instinct is to seal the air box. However, it is advisable to leave weep holes at the bottom corners to allow fuel to drain if the mixture is accidently left “on”.
I installed the MAP sensor. Since I had no room on the bottom of the induction tube, I decided to measure between both sides. I also had to tee off for Manifold pressure to the fuel pressure regulator.
I also mounted the VeeCU, with a debugger piggy backed. Everybody knows that heat is the enemy of electronics, but the debugger allows me to monitor the internal temperature of the enclosure and will keep an eye on it. I will determine before flight if it needs blast cooling.
I don’t know why, but the mounting holes for the enclosure are sized for something close to a #4 bolt. However, it mounts nicely with a #8 screw and finishing washer.
I drilled and tapped the cylinder head (1/8 NPT) for the Engine Temp Sensor.
Since the Onex firewall is small, and since I installed my super-duper double through down cabin heat assembly (Cabin Heat), I have very little firewall left. So, finding a place to mount the fuel pumps was a challenge. I finally ended up selecting a spot just forward of the main spare. They are out of the way but still accessible.
There are two ways to plumb fuel injection. You can “spider” out from the regulated pressure source with a line to each injector, or you can loop the pressurized fuel through a fuel rail. I’ve decided to loop/recirculate the fuel to avoid hot fuel in the individual injector feeds. Like I said, I’m about out of firewall so the pressure regulator ended up where it would fit. A little extra fuel line but … OK.
The firewall has been patched and the new AeroInjector cables routed. The fuel and electrical routing have been decided and appropriate firewall penetrations made.
The next problem to solve is exactly how to fabricate an upright to route the fuel to and from the fuel pumps, to hold fuel filters, and to hold the FI fuel shutoff valve.
Loads of fittings and fuel line on order.
Wes