Intake Valve Deposits form on the intake side or
back side of the valves. As deposits increase, they
restrict airflow and alter airflow patterns in the cylinder.
The deposits disrupt the balanced air/fuel ratio by
momentarily absorbing and releasing fuel, and they can
cause valve sticking by getting in the way of the valve
stem and guide. Deposits also restrict proper seating,
and the valves may be burned. Intake valve deposits
cause lost engine power, increased emissions, poor
engine efficiency and potential valve failure.
Combustion Chamber Deposits form on the top of the pistons
and on the cylinder heads. They increase compression
and absorb heat during combustion to later release it during
the intake cycle. In some engines with tight squish domes,
combustion chamber deposits cause the piston to actually hit
the cylinder head. This is referred to as combustion chamber
deposit interference or “carbon rap.” Combustion chamber
deposits also flake off as they get large, and these flakes can
get trapped between the valves and valve seat, resulting in
compression loss, difficult starting and rough idle.
Higher compression and stored heat cause increased intake
fresh charge temperatures and the increased likelihood of
pre-ignition “knock” or “pinging” when the fuel spontaneously
combusts prior to spark ignition. This increases emissions
and may cause engine damage. Many of today’s cars have “knock” sensors that adjust spark timing to prevent knock.
Although audible knock is controlled, power is lost from retarded
timing. Higher octane fuels of 4-5 octane numbers can be
used to help prevent knock, an effect called “octane requirement
increase.” As a vehicle ages, more expensive higher
octane fuel is needed to keep it operating at peak performance.
By cleaning combustion chamber deposits, knock is controlled,
power is restored, fuel economy increases and higher
octane fuels are less necessary for peak performance.
Maximum Fuel Economy
AMSOIL P.i. maximizes fuel efficiency by dissolving and removing
fuel system deposits and other contaminants for improved
power and overall performance.
Treat one full tank of gas every 4,000 miles or 100 hours of
service. One bottle treats 20 gallons of gas. Do not treat and
run more than 40 gallons of gas per treatment. P.i. helps pass
emissions tests. Treat gas, run that tank and fill up again
prior to test. Safe for use with catalytic converters, oxygen sensors,
oxygenated gas and 10% ethanol blended gas. Not recommended for two cycle engines.
DANGER: Combustible. Harmful or fatal if swallowed. Harmful
if inhaled. Skin and eye irritant. Read precautions on container