Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID

SERVICE MANUAL NUMBER 24
GENERAL INFORMATION
For best speed and minimum spray, the corner between the bottom and the transom should
be sharp.
b
c
72003
a
a  - Bottom
b  - Corner
c  - Transom
The bottom is referred to as having a “hook” if it is concave in the fore-and-aft direction. A
hook causes more  lift on the bottom  near the transom and  forces the bow to drop.  This
increases wetted surface and reduces boat  speed. A hook, however, aids in planing and
reduces any porpoising (rhythmical bouncing) tendency. A slight hook is often built in by the
manufacturer. A hook  also can be caused  by incorrect trailering or  storing the boat with
support directly under the transom.
a
72004
a- Hook
A “rocker” is the reverse of a hook. The bottom is convex or bulged in the fore-and-aft direc-
tion. It can cause the boat to porpoise.
a
72005
a- Rocker
Any hook, rocker or surface roughness on the bottom, particularly in the critical center-aft
portion will have a negative effect on speed, often several miles per hour on a fast boat.
Index
90-861327--1
OCTOBER 1999
Page 1A-7
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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- 895 pages
Document File TypePDF
CopyrightAttribution Non-commercial
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Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID SKU UPC Model
Fernando Woll on Dec 09, 2014. Boat Engine

Great performance engine.
Class 1


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