Engine Data

Search the Heavy Maintenance Manual for the word "Configuration" to find all the differences.
Esssentially Ver/Config #2 engines are intended for fixed pitch props. (Non-Hydraulic) 
Ver/Config #3 engines are configured for Hydraulically actuated, Constant Speed Props.
The biggest difference is which Propeller shaft is installed plus a few other changes. 
Ver #4 is a Crossbred (2.5) config and #1 is lost to history.

This SL is aldo applicable to my Engine. (Attached)

SL 912-007 R1

Q1.Is this just a paperwork change to apply limitation to Max Continuos Power of 80 HP or is my engine physically different from a Standard 100HP 912ULS? 

Q2.The Serial number would nean my engine is the 499th in this production run ?

Q3. Still chasing date of manufacture for life limits etc.

Thanks all ?

It appears you have a Un-Licensed Sport French Restricted Output engine. (ULSFR)
It apparently is, or was, restricted to 80Hp before 2011.

I do not know how this was accomplished.
I can not find anything in the Parts or Maintenence manuals that refer to the differences.

Outboard Motor Manufacturers often produced a 15hp engine and then derated it to 9.9hp by installing smaller carburetors.
Another method was to install a metal baffle in the intake manifold after the carburetor to restrict the airflow to the cylinders.
The Baffle could be easily removed to restore full power.

A throttle arm limiter would also be a possibility.

I gathered the de restriction was to comply with French Regs, but also struggle to find hiw this was acheived?

My airframe can accept a 80HP or 100HP Power Plant but the Prop Size is Larger on the 100HP........My aircraft has the larger prop fitted??

More info required..........

Full power may have been restored years ago.
If you can measure the manifold pressure, it will tell the story.
Take note of the MAP, Engine OFF. (Ambient local Pressure)
If at WOT the MAP comes up to within 2" of ambient pressure, you are making the 100 hp. (27-28")
If it is limited to greater than 3" below ambient, you have an 80 Hp engine. (25-26")