REFLECTOR: Goose Repair Update (Engine Run)

[nmflyer1 at aol.com]

Brian, 

I'm using 12 as initial crank timing. 

Post start enrichment is set according to Airflow Performance specs. Pretty simple really, Get the thing to idle in the middle of the leaning arm stroke. Then set the power circuit so that it doesn't stumble when you advance the throttle. 

I haven't gone much farther than that yet since I don't have the prop installed (it Will change). I'm waiting til after I paint it to put the prop on. Then I can go with temps and fine tuning. 

Once the beast is safe & tested, I can fly it to Airflow Performance and they will tweak all my injectors to run as close to perfect as they can get them. They have a very affordable and efficient method for doing this. 

Since I have no computers in the machine, there is really no fuel mapping, just old style NasCar tuning. 

Kurt 





-----Original Message-----
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Mar 21, 2011 9:17 am
Subject: Re: REFLECTOR: Goose Repair Update (Engine Run)


I want to talk to you.

What are you using for cranking timing, and post start enrichment?  And at what temps?

On 3/21/2011 10:14 AM, nmflyer1 at aol.com wrote: 
Brian, 
 
I appreciate the update... Good work. Keep us in the loop!
 
Kurt 





-----Original Message-----
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Mar 21, 2011 8:51 am
Subject: REFLECTOR: Goose Repair Update (Engine Run)


This weekend, I ran the engine for the first time since the March 29th off field incident almost two years ago. 
 
It feels good to be at this point again. 
 
I modified the fuel system this time, making it simpler. I removed the fuel shutoff valve, and in its place mounted a needle valve for the backup injection. I removed the backup electronic injection system, not because it didn't work, but because it's adding complexity for these early flights. I will add it back in at a later time. Who knows this manual arrangement may work so well that I just keep the needle valve regulating assembly. 
I am using a two bladed prop for testing in order to get my static RPM's up so that I can map out my fuel table. 
 
The engine ran well. I was able to get 2700 RPM, and calibrated my mixture at 1000, 1500 and 2000 RPM all with fine pitch. All fittings are tight, so no leaks. In order to increase my testing time, I used two leaf blowers into the plenums to keep CHT's down. That really makes a big difference. I can get ten minutes on a run, and I think I'll add another blower to the oil cooler, which will let me run indefinitely. In all I put 45 minutes on the engine this weekend. 
 
The backup injection was tested, and works well. 
 
The problems I need to work on is a hard cold engine start. Something's not right there, and I only get a few tries per day to work on it. It also runs very poorly on the magneto, so I need to see what's up there as well. 
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