Mazda RX-7 - Notes on Break-In; Overall Maintenance of the Racing Car

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3.
Determination
of condition.
lf the
compression
pressure
for
any chamber is
below
5 kg/cm2,
with
a cranking
engine
speed
of
250-300
RPM,
the engine
should
be
rebuilt.
Overall maintenance
of the racing
car.
We
recommend
keeping
thorough
records
on
the maintenance
per-
formed
on
the car,
along with
all
practice
and race information.
These
are two
examples
of
the types
of
record
forms we
suggest:
TIMING
SHEET RACE-
LAP
DRIVER
TIME REMARKS
l. New
engine break-in.
The break-in
procedure
for a
race
en-
gine
is
as follows:
1. lf
a dynamometer
break-in:
Notes on break-in:
(1)
The
engine oil should
be a
low
ash content, mineral racing
oil.
(2)
The water and oil tempera-
tures
should be maintained in
the range
of 70-80'
C
(160-
175"
F).
(3)
The ignition
timing for
both
leading
and trailing
spark
plugs
should
be 20' BTDC.
(4)
The fuel
should
be a
mixture
of
oil-to-unleaded
gasoline
of
1:100-1:150, measured
by
vol-
ume.
2. lf the engine is
broken-in
on a
race
track:
used
for
RPM Power
(PS)
Time
(hours)
New
bearings
Used bearings
1
500 12-14
0.5
2000 16-19
0.5
0.5
2500
24-30
0.5
3000
28.35
0.5
4000
47-57
1.0
n<
5000
63-77 1.0
0.5
6000
94-108 1.5
0.5
6500
102-117
16
0.5
TOTAL
7.0
z.J
MAINTENANCE
SHEET
DATE
RACE
REMARKS
REPLACED
PARTS
1
2.
3.
RPM
Mileage
5000
New bearings
Used bearings
60
6000
60
25
7000
60
25
8000
60
25
8500
60
25
TOTAL
300
100
25