Banks Power Twin-Turbo: Forced Induction- Twin Turbos Small Block Chevy - Manual (Page 5)

96800 v.1.0
5
The turbochargers are supplied with
heat shields, outlet gaskets, 3” tube
outlet flanges, and eight
3 ⁄ 8 -16 x 1” 12
pt. bolts. One outlet gasket is used on
each side of the heat shield. When
building the exhaust system, have the
heat shields and all gaskets in place so
your final stack-up of parts will be
correct.
IGNITION
A high-energy multiple spark or CD
ignition system is required to provide
adequate spark energy during high
boost operation. Check with your ECU
manufacturer to determine what type
of ignition triggering is compatible with
the ECU circuitry. Distributor cap,
rotor, and plug wires must be in top
condition to prevent miss firing under
boost. Spiral-core, low-resistance plug
wire is recommended for use with
most electronic ignition systems.
Sparkplug selection will vary
somewhat with the system application
and cylinder heads used. In general,
plugs will need to be several heat
ranges colder than stock to prevent
the plug from becoming a source of
pre-ignition. Do not use projected tip
plugs that extend the center insulator
into the combustion chamber.
LUBRICATION
Any oil suitable for lubricating the
engine will lubricate the turbos. Oil
contaminated by dirt or debris, or a
lack of oil, will cause rapid turbo
bearing failure. Anytime new turbos
are installed, or a new engine is
started for the first time, the turbos
should be oil-primed prior to engine
start-up. Disconnect the turbo oil drain
lines at the oil-pan fittings and crank
the engine with the ignition off until oil
is observed flowing from the drain
lines, then reconnect lines and start
the engine. An alternative method is to
pump several shots of clean engine oil
into each turbo oil inlet fitting, then
crank the engine with the turbo feed
lines disconnected and ignition off
until oil flows from the feed lines.
Reconnect the lines and start the
engine. Oil priming ensures that the
turbos will not be spinning before
engine oil reaches them, as in an
unprimed engine with empty oil
passages.
When a turbocharged engine is shut
off after a period of operation,
especially when it has been run under
moderate or high boost, it is
recommended that it be allowed to
idle for 30-60 seconds before shut
down. This allows engine oil to cool
the turbo bearings and to prevent the
hot turbo from baking the engine oil
into sludge on the turbo bearings. Do
not shut a turbocharged engine off
immediately following high RPM/boost
operation, as the turbos will spin for a
number of seconds with no oil
pressure, causing bearing damage.
Never place a restrictor in the inlet or
outlet turbocharger oil line. The
turbocharger bearing clearances
provide the necessary restriction to oil
flow. A restricted or blocked turbo oil
drain line will cause oil to back up into
the turbo, pushing past the seals and
entering the intake or exhaust system
resulting in oil burning. Restricted oil
inlet flow may result in damaged turbo
bearings. If the engine will not produce
normal oil pressure, steps must be
taken to upgrade the engine’s oil
system, or reduce oil
temperature/increase viscosity.
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