LS.4
23/25
LS
P
ROPELLERS
- G
ENERAL
Nothing is more important to the proper performance of your boat than the condition of
the propeller(s). Even minor damage (often invisible to the naked eye) can adversely
affect the boat’s performance. Common symptoms of damage to propellers are a sudden
drop in RPM, vibration or sudden loss of speed.
A propeller is measured by two dimensions: 1) the diameter; and, 2) the pitch. The
diameter is determined by measuring the distance from the center of the propeller to the
tip of one blade and multiplying that figure by two. Pitch is expressed in the number of
inches a prop will advance in a solid medium in one revolution.
Operational characteristics of your boat, including its speed, may change due to several
factors: atmospheric conditions; additions of extra equipment and accessories or
passengers; marine growth on the bottom; and, engine condition. Other factors include
damage to the prop(s), tides, water temperature and direction of wind. Some of these
factors are directly correctable by repair or maintenance. Others are beyond human
control.
INCORRECT PROPELLER APPLICATION CAN CAUSE ADVERSE HANDLING
CHARACTERISTICS. DO NOT CHANGE TYPE OR SIZE OF PROPELLER WITHOUT CONSULTING
YOUR COBALT DEALER!
S
TAINLESS
S
TEEL
Some Cobalts are standard equipped with stainless propellers. In this instance, do not
substitute aluminum propellers. Adverse handling and top speed characteristics may be
experienced.
P
ULLING
P
OWER
If you need extra pulling power, you can obtain this by decreasing the pitch of your
propeller(s) by two degrees. This will not endanger the engine or drive unit as long as
the manufacturer’s recommended top RPM’s are not exceeded.
P
ROPELLER
A
PPLICATION
C
HART
- 23LS
Model
Mfgr
Engine
Drive
Fuel system
std. ratio
Option
php
Prop Dscpt
Mfg. part #
23LS
Merc
5.0L
ALpha
2 BBL
1.62
1.81
220
23LS
Merc
5.0L
Bravo 1
2 BBL
1.65
NA
220
23LS
Merc
5.0L
Bravo 3
2 BBL
2.20
2.43
220
23LS
Merc
5.0L EFI
ALpha
Throttle-Body
1.47
1.62
240
23LS
Merc
5.0L EFI
Bravo 1
Throttle-Body
1.65
NA
240
23LS
Merc
5.0L EFI
Bravo 3
Throttle-Body
2.20
2.43
240
23LS
Merc
5.7L
ALpha
2 BBL
1.47
1.62
250
23LS
Merc
5.7L
Bravo 1
2 BBL
1.65
NA
250
23LS
Merc
5.7L
Bravo 3
2 BBL
2.20
2.43
250
24’s
48-823665A6/66A6
23LS
Merc
5.7L EFI
ALpha
Throttle-Body
1.47
1.62
260
15 1/4 x 15
48-78116A45
23LS
Merc
5.7L EFI
Bravo 1
Throttle-Body
1.65
NA
260
15 1/4 x 19 RH
48-13700A45
23LS
Merc
5.7L EFI
Bravo 3
Throttle-Body
2.20
2.43
260
23LS
Merc
350 Mag MPI
ALpha
Multi-Port
1.47
1.62
300
23LS
Merc
350 Mag MPI
Bravo 1
Multi-Port
1.50
1.65
300
15 1/4 x 19 RH
48-13700A45
M
ODEL
S
PECIFIC
I
NFORMATION
C
OBALT
B
OATS
- O
WNER
’
S
M
ANUAL
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