Exhaust System; Fuel System - ILMOR 2011 MV8 User Manual

EXHAUST
SYSTEM
FUEL
SYSTEM
ILMOR MV8
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 tem-
peratures 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.
Excessive exhaust temperatures will damage the exhaust hose and are symptomatic
of a leak or restriction in the cooling system. The engine should be shut OFF imme-
diately in the presence of too much heat, whether by odor, touch or sight. Failure to
do so may result in more serious consequences, including but not limited to, damage
to the engine, which is not covered under warranty, and/or damage to the boat that
may result in personal injury as well.
The exhaust manifolds are water-cooled. Water temperatures in the exhaust
manifolds range from 158 F. to 194 F. (70 C. to 90 C.) The ILMOR exhaust mani-
fold water temperatures are approximately 50-66 per cent warmer than exhaust
manifolds on engines without catalytic converters. 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.
The MV8 exhaust hose meets SAE J2006 and ABYC Standards. These hoses
function properly in conditions up to 250 F. (121 C.)
ILMOR engines are equipped with a catalytic converter system. This allows
ILMOR marine engines to earn a Four-Star emissions rating and comply with the
California Air Research Board (CARB) rules. 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 an authorized ILMOR dealer.
See additional important information in the Emissions chapter of this Owner's Manual.
ILMOR's MV8
Fuel Injection (MEFI-5) system, the most up-to-date system available in the industry. The
MEFI-5 is an advanced engine controller that is capable of meeting all emission, On-Board
Diagnostics Marine (OBD-M) and driveability requirements of marine applications.
All fuel system lines and connections must meet the requirements of U.S. Coast Guard
(USCG) regulations. This means that hoses must meet or exceed SAE Standard J1527 DEC85,
and hoses used for fuel delivery must meet or exceed specification in USCG regulations, Sec.
183.540 for recreational boating. Additionally, all fuel hose must meet the 15g/m^2 limit
for fuel permeation. All plumbing for the fuel system on ILMOR engines, and the boats in
which ILMOR authorizes placement, meet or exceed all requirements. See also Fueling the
MV8 chapter of this Owner's Manual for additional information.
2011 ILMOR MV8 Owner's Manual • Page 5
engines are equipped with "wet" marine exhaust systems. In
engine is equipped with the fifth generation Marine Electronics