Exhaust Questions

AG Ops

Member
Jun 12, 2022
10
1
I'm the new owner of a 220 warrior with a mercruiser 5.7L vortec. I'm new to boating, too. I had just pulled the port side head and lapped the valves, flushed the manifolds and risers. Turned it up with plugs, wires, ignition module, and rotor cap. Got it on the water last Thursday and was really happy with it! It looks like the exhaust (wire reinforceed) hoses was last replaced in 2004 - best guess by date on hose. What is the recommended replacement intervals for the hoses? I was reading some old threads where folks had replaced with stainless pipe... One thread, a fella had made Stainless tubes and surge tubes / Y pipes. What are surge tubes for? If i replace my exhaust hose, should I consider installing surge tubes? Was this a kind of service bulletin or recommendation from Shamrock? Currently, the hose is 7' long run. Thanks in advance, just trying to educate myself.
 

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Ship

Well-Known Member
Supporting Captain
Dec 15, 2008
11,983
310
Atlantic City, NJ area
Surge chambers prevent water from backing up the exhaust into the engine. The fiberglass versions look like this:
 

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Mistress

Moderator
Staff member
Supporting Captain
Jan 22, 2005
7,430
229
San Jose, CA
IME the wire reinforced hose last a long time. But you can kill it quick if you overheat the exhaust. A failed raw water pump is the "best" way to do that.
 

TK246WA

Well-Known Member
Aug 18, 2020
137
13
South shore, MA
I had hoses from 2008 that almost sank my boat. Take a look at the connection to the exhaust tips and make sure they are in good shape. Look for rust or water intrusion.
 

AG Ops

Member
Jun 12, 2022
10
1
Thanks for all the replies! Please keep the comments flowing. Good conversation is more than welcomed!

I came across this diagram while searching the web. Minus the muffler, is this the basic configuration that Shamrock did on the newer boats? If so, im thinking I could use this as reference when/if I decide to upgrade my system.
 

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Gary S

Well-Known Member
Feb 4, 2010
1,635
163
Algonquin Illinois,Key Largo Florida
Keep in mind that if you change from rubber hose to fiberglass,stainless or copper the noise level inside the boat will likely go up. It was noticeable in dads ConWalk when he took out the original waterpipe and put fiberglass in it's place.
 


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