05-4
MMC2005-001_05A.FM
SECTION 05 - ENGINE PREPARATION
ENGINE TUNING CAUTIONS
Here are a few items to keep in mind when work-
ing with your engine.
If you are in stock classes, know what adjust-
ments are legal.
Modifications to the power curve of an engine will
require recalibration of the transmission.
The lower the RPM at which you can generate the
torque you need, the higher the percentage of that
power that will reach the track.
Sloppy engine modification usually results in less
power than you had stock.
Use the proper octane gasoline for your engine
(Modification may require higher octane.).
Correct your carburetor jetting for the atmospheric
conditions which exist at the time as close as pos-
sible to the time you will be competing.
Follow the assembly and disassembly procedures
outlined in the appropriate
Shop Manual.
BASIC ENGINE THEORY
Terminology
CYCLE
In a combustion engine, a cycle is
accomplished when the four (4)
phases; intake, compression,
ignition and exhaust are
complete.
TDC
Top Dead Center:
The position of the piston when it
reaches the upper limit of its
travel inside the cylinder.
BTDC: Before Top Dead
Center
ATDC: After Top Dead Center
BDC
Bottom Dead Center:
The position of the piston when it
reaches the lower limit of its
travel inside the cylinder.
BBDC: Before Bottom Dead
Center
ABDC: After Bottom Dead
Center
BORE
Diameter of the cylinder.
STROKE
The maximum movement of the
piston from BDC to TDC. It is
characterized by 180° of
crankshaft rotation.
COMBUSTION
CHAMBER
Space between cylinder head
and piston dome at TDC.
DISPLACEMENT
The volume of the cylinder
displaced by the piston as it
travels from TDC to BDC. The
formula is:
20
=
(
π
= 3.1416)
Expressed in cc
(cubic centimeters)
NOTE:
To transfer cc to cubic inches, divide cc by
16.387.
COMPRESSION
Reduction in volume or
squeezing of a gas.
Bore2
Stroke
×
π
×
4
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Содержание ski-doo MACH Z 1000 SDI
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Страница 289: ...SECTION 06 DRIVE SYSTEM MMC2005 001_06A FM 06 27 422 A01D3JA 417 222 562 427 A01D3KA 417 222 677...
Страница 473: ...SECTION 12 SERVICE TOOLS MMC2005 001_12A FM 12 29 N Scratch remover P N 861 774 800 APPLICATION All models...
Страница 476: ...MMC2005 001_13A FM 13 1 SECTION 13 ACCESSORIES TABLE OF CONTENTS 0 ACCESSORIES 13 02...
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