Exhaust System - ILMOR MV8 Owner's Manual

SECTION 2 ILMOR MV8 OWNER'S MANUAL
2-2

EXHAUST SYSTEM

Ilmor MV8 engines are equipped with "wet" marine exhaust systems. In
a wet marine exhaust system, raw water enters the exhaust elbows (also
referred to as "downturn adapters"), where it mixes with the exhaust gases.
The mixing of the water and exhaust gases is important because it provides
cooling to the rubber hose that connects the exhaust elbow to the muffler.
After the water-exhaust gas mixture passes through the mufflers it exits
back into the body of water.
Water-exhaust gas mixture temperatures will be less than 250°F (121°C). If
the temperatures are greater than that, the rubber exhaust hose will burn.
If the hose has an odor of burning rubber, immediately shut down the
engine. Check for leaks or restrictions in the cooling system.
CAUTION! Never allow excessive exhaust temperatures as they will
damage the exhaust hose and are symptomatic of a leak or restriction
in the cooling system. The exhaust manifolds are water-cooled. Water
temperatures in the exhaust manifolds range from 158°F to 194°F (70°C to
90°C). If the engine exhaust manifold temperature reaches 199°F (93°C)
in an open cooled engine or 239°F (115°C) in a closed cooled engine, the
system is malfunctioning, and as with the situation involving the hoses
explained above, the engine should be shut OFF. Check the cooling system
for leaks or restrictions. It will not be unlikely that overheating will affect
both the manifolds and hoses, as a symptom of cooling system problems.
Ilmor engines are equipped with a catalytic converter system. The catalyst
bricks are press fit into one-piece exhaust manifolds. If needed, the catalyst
bricks can be removed and replaced within the original exhaust header.
However, a special tool is needed to remove the catalyst brick and install a
new one. Ilmor strongly recommends that this function be performed by a
certified Ilmor dealer.
See additional important information in Section 9, Emissions.
© 5/2013 Ilmor Marine, LLC, Version 1.0