Grasshopper187
Cadet
- Joined
- Feb 23, 2013
- Messages
- 15
Ok, I'm a tech geek. Gotta know this stuff. My boat has a Suzuki DF115A four stroke outboard. Engine hours are determined by reading the tachometer and counting the number of flashes of the rev-limit light after you turn on the ignition but before starting. A table in the manual shows the relationship between tachometer reading, number of flashes and engine hours.
I imagine that engine hour meters could be set up to indicate:
1. Hours the ignition switch is on
2. Hours the engine is running
3. Average hours at the equivalent of 1000 rpm. For example, at 1000 rpm (60,000 rev/hr), hours would be the number of revs divided by 60,000.
4. Average hours of equivalent normal cruise speed based on rev counting. For example, with a normal cruise speed of 4000 rpm (240,000 rev/hr), hours would be the number of revs divided by 240,000.
Engine wear is probably proportional to the number of revs (wear), engine speed (inertia forces), time spent idling, start-stop cycles and lubrication so there are probably many reasons to prefer one scheme over the other.
Does anyone know the actual scheme Suzuki uses on this motor?
I imagine that engine hour meters could be set up to indicate:
1. Hours the ignition switch is on
2. Hours the engine is running
3. Average hours at the equivalent of 1000 rpm. For example, at 1000 rpm (60,000 rev/hr), hours would be the number of revs divided by 60,000.
4. Average hours of equivalent normal cruise speed based on rev counting. For example, with a normal cruise speed of 4000 rpm (240,000 rev/hr), hours would be the number of revs divided by 240,000.
Engine wear is probably proportional to the number of revs (wear), engine speed (inertia forces), time spent idling, start-stop cycles and lubrication so there are probably many reasons to prefer one scheme over the other.
Does anyone know the actual scheme Suzuki uses on this motor?