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External flappers are available at most
boat stores and marinas. They are
modestly priced and a spare set can
be easily stowed in the boat.
Internal flappers come in many
different styles and are usually only
available through the manufacturer of
the exhaust tip.
boat stores and marinas. They are
modestly priced and a spare set can
be easily stowed in the boat.
Internal flappers come in many
different styles and are usually only
available through the manufacturer of
the exhaust tip.
| Exhaust Flappers |
 | |  | |  | |  |
Exhaust flappers are an important
component in the engine.
Flappers are required to keep water from
entering the exhaust when the boat
operator cuts the power at speed
("following seas").
Flappers are extremely important when the
boat is sitting in a slip or beached with the
engine shut-off. Waves and wakes can fill
up an engine very quickly.
The exhaust flappers should be inspected
and replaced regularly.
External flappers can be inspected at a
glance and changed with a screwdriver
(while the boat is in the water!).
Internal flappers can not be changed so
easily! The boat needs to be pulled from the
water and the exhaust tips need to be
removed from the transom!
component in the engine.
Flappers are required to keep water from
entering the exhaust when the boat
operator cuts the power at speed
("following seas").
Flappers are extremely important when the
boat is sitting in a slip or beached with the
engine shut-off. Waves and wakes can fill
up an engine very quickly.
The exhaust flappers should be inspected
and replaced regularly.
External flappers can be inspected at a
glance and changed with a screwdriver
(while the boat is in the water!).
Internal flappers can not be changed so
easily! The boat needs to be pulled from the
water and the exhaust tips need to be
removed from the transom!
Internal flappers add
considerable amounts of
restriction to exhaust flow.
External flappers do not
make noise like rubber
covered metal internal
flappers.
considerable amounts of
restriction to exhaust flow.
External flappers do not
make noise like rubber
covered metal internal
flappers.
The mufflers are 10
inches long with 5
inches inside the flange
and 5 inches outside of
the flange.
inches long with 5
inches inside the flange
and 5 inches outside of
the flange.
| Exhaust Tip Kit Includes: Two Tips with flappers Part Number # 580-3101 $175.95 |
The inlet to the muffler is tapered to
funnel the exhaust gases into the
muffler from the 4 inch rubber exhaust
hose.
funnel the exhaust gases into the
muffler from the 4 inch rubber exhaust
hose.
| The Muffler/Tips Kit includes: Two Muffler/Tips and Flappers Part Number #590-3101 $225.95 |
The muffler has a 4 inch outside
diameter with a 2-1/2 inch inside
diameter.
The muffler core is perforated and
packed with stainless steel and
silences without restricting exhaust
flow.
The tapered outlet reduces the
"rushing air noise" as the fast moving
exhaust gases exit the muffler.
diameter with a 2-1/2 inch inside
diameter.
The muffler core is perforated and
packed with stainless steel and
silences without restricting exhaust
flow.
The tapered outlet reduces the
"rushing air noise" as the fast moving
exhaust gases exit the muffler.
| Stainless Steel Thru-the-Transom 4 inch Exhaust Mufflers |
| The exhaust tips come with external flappers. |
Straight thru exhaust
tips are 4 inches in
diameter and 10
inches long:
5 inches inside the
flange and 5 inches
outside the flange.
tips are 4 inches in
diameter and 10
inches long:
5 inches inside the
flange and 5 inches
outside the flange.
| Stainless Steel Thru-the-Transom 4 inch Exhaust Tips |
When installing
thru-the-transom
exhaust the "Y" pipe
should be removed and the
hole in the transom
assembly covered with a
block-off plate.
thru-the-transom
exhaust the "Y" pipe
should be removed and the
hole in the transom
assembly covered with a
block-off plate.