Do not use these fuel injectors. We had one blow apart today on the
TTC project.  There is a short section of .032 thick  aluminum
between you and a flaming death.

We are also still fighting the yellow snot built up in the aluminum
fuel lines as the result of burning Methanol. The boss will not re
plumb the fuel system in SS or rubber. He is paying the price of
ignoring that.

It is now plugging the injectors and we are on our third set. The
company that sold us our second set charged $800 for four.

You can buy the basic Bosch injector for $50  with out the adapter
on ebay. You may have to re-machine the fuel rail if you use the
basic Bosch injector as the upper O ring may be larger. The basic
Bosch 2000  injectors with out the adapters are just plain great.

As long as they are not plugged :-)

We are talking about just 4 injectors controlling 650 HP on  a turbo
 two rotor! Each injector will flow up to 320 pounds of fuel per
hour.

I built an injector tester using six D cell batteries, a push button
 and a special injector holder to take the 150 psi injector
pressure.

Paul Lamar


The yellow snot is a seal or gasket or fuel cell foam dissolving in
the fuel. Why not racing fuel or avgas?.... . Lynn E. Hanover

Not in our case. Get a jar of Methanol and put a strip of non
anodized  aluminum in it. Within hours you will see the yellow snot.

Menthanol cools the intake system air. At our 650 HP level even that
 is not enough so we use water injection to keep the intake air below
 the 150 F pre-ignition limit. Other wise it would be over 200 F.


Paul Lamar



What PSI are you running the fuel at for TTC ?

The standard yellow RX8 injectors take an 11mm drill bit.
http://www.rossmachineracing.com/injectortool11mm.html <

They also sell the 14mm drill bit (Bosch)

- Matt Boiteau

150 PSI. I am not allowed to change the TTC fuel plumbing. Just fix
it :-)

Here is a system I designed and built.

Paul Lamar


I would say the repair is to replace whatever is giving the problem.
 If you can not do that, it is time to walk away. If the engine quits
 and the aircraft crashes, you could be held responsible.

Dale Davies

So true.

This morning he gave permission to redesign the injector mounting.

Paul Lamar

Paul Are the tanks aluminum also? Could be another source of the
yellow snot corrosion product Bill

Believe or not they are fiberglass. I am not sure which epoxy resin
was used, They tested it with Methanol or they told me they did.


Paul Lamar



Vinylester or epoxy are methanol resistant, polyester resin is not.
Methanol breaks down polyester resin. Look up what methanol did to
fiberglass built in boat fuel tanks. Bad stuff. My wheeler tanks are
integral to the wet wings, but the resin is vinylester. And I epoxy
coated it for additional insurance.

Kevin Alderman

I wonder what resin was used in Sandy McNabb's Glass Goose that had
the wings delaminate !

Steve Carlisle


Once you get it cleaned out, try draining the fuel tank and put a
gallon of gasoline in. Run the engine until it runs rich to get
gasoline through it completely. Then next time you run it drain the
gas and put methanol in the tank. You can reuse what you drain out.
Dale Davies

We are going to try something like that. We are also in the process
of taking most of the aluminum  out of the plumbing.

Paul Lamar


306 or 316 ST tube? Dale Davies

AN rubber line.

Paul Lamar

http://damonq.com/red-kote.html

We use this at the shop and in older equipment when the tanks get rusty and start causing problems. Bonds well and is resistant to methanol and other chemicals.

Remove the tank, wash it with MEK, let it dry and coat it.

Then drain the tank after each flight or test run.

Kevin Alderman.


Sounds great. Will igt stick to un anodized aluminum. Epoxy won't.

Paul Lamar



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