Yanmar 6LYA-STP

 

The Power Behind Stella Blue

The Yanmar 370 has been a popular choice for power in the single engine version of this boat. Yanmar has enjoyed a great reputation in auxiluary power in sail boats. We had a 27 year old Yanmar in our last sailboat that just ran great all the time, so we were quite happy that this boat had Yanmar power.

The Yanmar 370 HP is one version of the 6LY family. It is the same engine as the 350 HP 6LYA-STE, just rated differently. The Yanmar engine codes for these  engines goes like this:

6

LY

A

ST

E or P

No. of cylinders

family of engines

final assembly in America
(long block assembled in Japan)

Super Turbocharged

Export or Pleasure rated

The engine code information came from Yanmarhelp.com. This a great site with lots of useful information

Yanmar 370 Specs

Model   6LYA-STP
Configuration   4-stroke, vertical, water cooled diesel engine
Number of cylinders   6 in-line
Bore x Stroke mm (in.) 100 X 110(3.94 X 4.33)
Displacement lit. (cu. in.) 5.184(316)
Continuous rating output at crankshaft kW/rpm (hp/rpm) 213/3100 (290/3100)
Maximum output at crankshaft kW/rpm (hp/rpm) 272/3300 (370/3300)
Combustion system   Direct injection
Aspiration   Turbocharged with intercooler
Starting System   Electric starting (D.C. 12V, 2.5kW starting motor/12V, 80A alternator)
Cooling System   Fresh water cooling by centrifugal fresh water pump and rubber impeller seawater pump
Rotation of Crankshaft   Counterclockwise viewed from stern
Dry Weight kg (lbs) 510 (1124)
Atmospheric conditions= ISO 3046/1, Density of fuel= 0.86g/cm3, 1hp=0.7355kW

View the complete Yanmar 6LYA-STP spec sheet

 

Marine Gear
Model ZF 80-A
Ratio A 2.5  B 2.5
P/N 3313001005
S/N 42436L

 

Yanmar Test Data

The following data was published on the Mainship Website as data collected by the "major engine suppliers during real world boat tests of mainship yachts." This information is not any guarantee of any performance but is interesting to look at.

Keep in mind, these tests were done on a lightly loaded boat with brand new (read-very clean hull)

40 Trawler with Single Yanmar 6LYA-STP/370 HP

 

RPM

MPH

KNOTS

GPH
Total

MPG/Statute

Range/Statute

1000

4.8

4.2

Not Measured

Not Measured

Not Measured

1500

7.7

6.7

3.1

2.5

670.6

2000

9.5

8.3

5.0

1.9

513.0

2500

10.9

9.5

8.5

1.3

346.2

3000

14.9

13.0

13.7

1.1

293.6

3500

19.2

16.7

19.5

1.0

265.8

Test date 4/26/05. Range based on 90% fuel capacity. Boat load included 150 gal gas, 130 gal water, 2 people with gear.