George,

 

When I was being checked in the plane out by Orin Ridell he did a “GAMI” check. I believe the # 5 EGT peaked at 1528 F. That is what I’ve used as the reference EGT for adjusting to lean of peak. Based on that, this flight was 103 F lean of peak.

 

Why am I getting the feeling that I may have been operating using incorrect procedures/data?

 

Lynn

 

 

 

Lynn,

 

Do you know how far lean (or rich) of peak you wee at 18.9 gph?

 

Normally at 29.5” x ~2500 RPM   and 18.9 gph - - - you would be pretty close to peak TIT. 

 

But your TIT values don’t look like they are at absolute values that would normally correspond to peak in a 7.5”1 TSIO-550 engine.

 

Thus - - - just looking at the “over all picture”  of your data - - -   there is something there that doesn’t  “fit”.

 

If I was going to start troubleshooting,  I would first want to see a simple GAMI   lean test  at those power settings.

 

From that,  I could probably make a good educated guess as to where the instrumentation discrepancy is.

 

Regards,  George

 

 

Colyn,

 

Here are the figures from one of my flights a few months ago:

 

17,570’ Altitude (20,090 PA)

IAS – 195 KTS; TAS – 265 KTS

Induction air temp – 84 F

Manifold pressure – 29.5

RPF – 2490

Fuel flow – 18.9 GPH

TIT # 1 – 1620 F

TIT # 2 – 1576 F

 

EGT           CHT

 

1. 1456       1. 334

2. 1415       1. 335

3. 1451       3. 310

4. 1421       4. 301

5. 1425       5. 316

6. 1424       6. 315

 

Lynn Farnsworth

Super Legacy #235

TSIO-550 Powered

Race #44