Set up Tsio360lb7

[Arthur]

I have a tsio360lb7 with a turbo plus intercooler and a Merlin waste gate. The engine is being set up after a major overhaul. The mechanic is using the turbo plus settings for upper end lower deck pressures and advancing the throttle to 38 inches based on the turbo plus chart for temp with the aircraft not moving. The rpm only reaches 2510. He has consulted turboplus, merlyn and a well know Mooney mechanic. The only suggestion he has had is the rpm will increase when the aircraft is moving. I have paid more attention to the manifold pressure than the rpm, but I seem to think in the past the rpm settled at 2650 not 2700 at take off. Does the set up require 2700 rpm and if so what do you change to get it?

[Aerodon]

How are you measuring RPM, 150rpm error on a mechanical gauge is not unusual.  Was your governor overhauled and properly set?  If you did exchange overhaul, did  you get the correct part number back?

I know Continental and others recommend checking the settings very year.  I'm in the camp trhart says if it ain't broke, don't touch it.  But then I have a good engine monitor, know what FF to see during take off and climb, and know when the engine is idling properly and shuts down correctly.

If your manifold pressure and FF are misbehaving, look closely for induction leaks in all the hoses related to the fuel pump (upper deck pressure) as well as the Merlyn.

And yes, if you are getting the required FF, RPM, MP pretty early on in the takeoff roll, all is good.  Otherwise abort.

Aerodon

 

 

 

 

 

[Arthur]

Yes, the governor was overhauled as well as the prop. This is a 3 bladed mt-propellor and the hub was sent to Germany for an ad that was never explained to me. They are closed till the 4th of January for Christmas.

[Arthur]

Oh the tack is digital.

[Jim F]

  On 12/22/2021 at 8:55 PM, Arthur said:

I have a tsio360lb7 with a turbo plus intercooler and a Merlin waste gate. The engine is being set up after a major overhaul. The mechanic is using the turbo plus settings for upper end lower deck pressures and advancing the throttle to 38 inches based on the turbo plus chart for temp with the aircraft not moving. The rpm only reaches 2510. He has consulted turboplus, merlyn and a well know Mooney mechanic. The only suggestion he has had is the rpm will increase when the aircraft is moving. I have paid more attention to the manifold pressure than the rpm, but I seem to think in the past the rpm settled at 2650 not 2700 at take off. Does the set up require 2700 rpm and if so what do you change to get it?

Expand  

Was the engine run in after the overhaul or is this the first time setting fuel flows.

RPM, MAP, FF, gov, prop low pitch stop(I am not familiar with the MT prop but it must has a low pitch stop) all are part of it.  As aero don says you need actual RPM and the same is true for MAP.  What was your max MAP?  You state your RPM is digital, is digital RPM new?  Do you have a known good way to verify RPM?  Is the gov holding the RPM or the Prop?  If you push the throttle forward kind of rapidly does the RPM go up an then pull back 50ish RPM after 1/2 a second?  You can do a fast taxi to get the RPM up to see if the RPM comes up.  You did not mention what you fuel flows were. If you are too lean or to rich you will not make full power and not make full RPM.  
jim

[Arthur]

Thanks Jim. This is the set up after engine install after major overhaul. The A/P is doing the set up. I am 1500 miles away waiting to retrieve my aircraft. He is following the turboplus set up requirements. After a second conversation have affirmed fuel pressures fuel flow and he states if he advances the throttle past the 38 “ momenterally he gets an increase of the rpm above 2510, but this would cause an overboost according to the turboplus reduction in MP required by ambient temp. Will be at the aircraft next Monday to fast taxi etc.

[N231BN]

There is a chart in the Continental manual that gives you a correction factor for setting fuel pressures when you can't get rated RPM on the ground.

[Guest]

  On 12/22/2021 at 8:55 PM, Arthur said:

I have a tsio360lb7 with a turbo plus intercooler and a Merlin waste gate. The engine is being set up after a major overhaul. The mechanic is using the turbo plus settings for upper end lower deck pressures and advancing the throttle to 38 inches based on the turbo plus chart for temp with the aircraft not moving. The rpm only reaches 2510. He has consulted turboplus, merlyn and a well know Mooney mechanic. The only suggestion he has had is the rpm will increase when the aircraft is moving. I have paid more attention to the manifold pressure than the rpm, but I seem to think in the past the rpm settled at 2650 not 2700 at take off. Does the set up require 2700 rpm and if so what do you change to get it?

Expand  

The maximum RPM setting at full throttle is determined by propeller blade pitch and not usually the governor.  In an MT propeller fine pitch blade angle is adjustable.  
As stated there is a chart used to determine fuel flow set up when rated RPM can’t be reached, but 150 is a long way off. It will be hard to set up all maximum power values until you get the RPM very close to rated values.

The only settings you will be able to set are un metered fuel pressure, idle speed and idle mixture.

Clarence