Honda G100K2 Applications Manual page 23

POWER OUTPUT
MAXIMUM ENGINE POWER – GOVERNORED ENGINE POWER
The governor system is designed in a way that even at the engine's maximum "governored" power delivery,
there is enough residual power to stabilize power fluctuations and keep engine speed stable.
The ratio between the engine wide open throttle (WOT)
maximum power and the governored maximum power
is generally 85%
(80% for GC(V)135/160 and GX(V) 610/620/670).
If the governor system is well adjusted and matching
the application, the engine must be able to produce
85% (or 80%) of the maximum power at a stable
engine speed.
POWER OUTPUT CONFIRMATION METHOD BY ENGINE SPEED DROP
Changes in the working load of an engine cause changes in engine speed (speed drop).
An indication on required power output when the engine is loaded is given by the engine speed drop calculation.
Honda's standard for speed drop is 5% for high speed applications and up to 8% for low speed applications.
Exceeding this 5% or 8% speed drop will extend into the maximum up to the wide open throtttle power range.
•
(N1) Measured engine rotation speed under actual operating conditions (stable condition - loaded).
•
(N2) Measured engine rotation speed under the same condition with load removed (stable condition – unloaded)
Speed drop calculation:
N2 – N1 x 100 % = is within 5 % (or 8%)
N1
Governored maximum power curve
- 22 -
Potential power
(wide open throttle)
Rated power
(governor 50% open)