Covverting to Thru-Hull Exhaust?

[Philster]

Re: Covverting to Thru-Hull Exhaust?

Here is the order of parts:

At the transom, you have thru hull fittings/tips. These have flanges that screw into the boat and require a sealant. Outside, the are purty and come in all shorts of shapes and sizes and looks (for the exhaust to blow out). Inside, the are designed to accept marine wet exhaust hose and are essentially a very short pipe. They need to be sized (Inside Diameter) I/D" for you ride. On mine, it's 4" I/D. Every time a hose meets a pipe, it gets locked down with 2 straps/clamps.

So, it goes risers/elbows to marine wet exhaust hoses to thru hull fitting/tips. On a V engine, that's two thru hull fittings/tips, two lengths of marine wet exhaust hose and eight clamps.

cpperfromance.com
eddiemarine.com

Ask questions. They have great support to help you order.

 

[jtmarten]

Re: Covverting to Thru-Hull Exhaust?

O... Learn something new everyday. So if I cut the holes and sealed them up, would the heat effect the seal? How hot would the tips actually get, because I know water is pushed throught the exhaust. would they get hot enough to hurt the faberglass, or the sealent (depending on what kind i get?)

No effect on the sealant. Folks have been running thru-hulls for decades. If you don't install correctly, or have proper water flow, you can have problems.

 

[SeanMcl]

Re: Covverting to Thru-Hull Exhaust?

MillitaryBoating, I propose that your thru hull exhausts should point back toward the occupants of your boat. Then you can be the primary beneficiaries of the new, improved sound.

And if your gut reaction is "Huh? I don't want to have that blasting at me at WOT", then you are an ignorant jackass if you go through with it.

Seriously, do you mount your stereo speakers on your swimdeck pointing backward and then add a 1500 watt amp so you can hear it up front?

 

[jetmart]

Re: Covverting to Thru-Hull Exhaust?

I would think twice before doing it. I bought a boat with thru hull exhaust and after a few times out I installed inline silencers. The novelty of the rumble wore off real quickly. You cannot carry on a conversation while cruising, cannot communicate at idle with a skier or tuber in the water. I was of the same opinion initially that it was a cool thing to have. Not anymore.

 

[jtmarten]

Re: Covverting to Thru-Hull Exhaust?

Check out speedwake dot com, offshoreonly dot com, and banderlog dot com sites. They specialize in high(er) performance boating. Lots of great info on there, and I'd say 80% have thru-hulls, and many of those have converted thru-props.

I can't carry on a conversation while cruising at 45mph, and certainly not at 57-59mph simply due to wind noise.
Generally communication with skiers/tubers is with hand signals (at least thats what we use) so there is no misinterpretation.

 

[ftl900]

Re: Covverting to Thru-Hull Exhaust?

I have thru the hull exhaust on my 23' Imperial, and have been teetering between going back to original, or trying to muffle the things. Yeah, it sounds really cool, but at the end of the day, I'm hoarse from yelling all the time.

Oh, wait. I'm 55 years old.
I may be too old to have an opinion on what's too loud...

 

[hourston18]

Re: Covverting to Thru-Hull Exhaust?

going to do my penta do i need to have a P trap like my sink so water dosnt back into my engine ?? help me out i have all the parts avalible just need some advise

 

[Simoniz]

Re: Covverting to Thru-Hull Exhaust?

Sounds to me a bit like the ignorant w@nkers who ride round on unsilenced Harleys.

What makes you think you have the right to inflict the noise on others who may be out on the water trying to enjoy some peace and quiet?

 

[legoman67]

Re: Covverting to Thru-Hull Exhaust?

gotta love thru hull! of course sitting in a new transom!

http://www.youtube.com/watch?v=7el9RC8LrO0

 

[180shabah]

Re: Covverting to Thru-Hull Exhaust?

going to do my penta do i need to have a P trap like my sink so water dosnt back into my engine ?? help me out i have all the parts avalible just need some advise

There is no p-trap in exhaust. minimum height above static waterline fro the riser dump and minimum drop from there to the tip is all in the merc manuals.

 

[Philster]

Re: Covverting to Thru-Hull Exhaust?

Eddie Marine and CP Performance have templates for where to cut the holes. The holes will be place to create the necessary drop for Bravo setups.

Based on the questions (such as those about P traps), I recommend you consider professional installation. Not getting a warm and fuzzy feeling about the OP's ability to do the job when I explained it's as simple as:

Riser... to wet exhaust hose... to tips @ the proper downward slope (see first sentence of this post). The exhaust hose connects to the metal pieces with two clamps at each connection.

Have a high quality hole saw attached to a good drill and make sure you know how to measure, remeasure and keep a saw centered. The most essential skills required for the job are:

-measuring accurately
-handling a drill/hole saw
-keeping said drill/saw centered.

 

[hourston18]

Re: Covverting to Thru-Hull Exhaust?

Eddie Marine and CP Performance have templates for where to cut the holes. The holes will be place to create the necessary drop for Bravo setups.

Based on the questions (such as those about P traps), I recommend you consider professional installation. Not getting a warm and fuzzy feeling about the OP's ability to do the job when I explained it's as simple as:

Riser... to wet exhaust hose... to tips @ the proper downward slope (see first sentence of this post). The exhaust hose connects to the metal pieces with two clamps at each connection.

Have a high quality hole saw attached to a good drill and make sure you know how to measure, remeasure and keep a saw centered. The most essential skills required for the job are:

-measuring accurately
-handling a drill/hole saw
-keeping said drill/saw centered.

i seen all that and until i got my tips today i didn't know that there was a built in flapper i was unsure as to what would stop water from filling the pipes if i suddenly stopped the boat

 

[militaryboating]

Re: Covverting to Thru-Hull Exhaust?

another question to add... if the tips are going to be above water even on idle is there a reason for flappers besides jus to be safe? thought about going out of water all the time didnt know if the whole angle and everything still applied

 

[4Winns2]

Re: Covverting to Thru-Hull Exhaust?

Thru hull exhaust sounds good for a while but that sound will drive you nuts in the long run. Not to mention the dirty looks you'll get from the noise. Just my opinion.

 

[Philster]

Re: Covverting to Thru-Hull Exhaust?

another question to add... if the tips are going to be above water even on idle is there a reason for flappers besides jus to be safe? thought about going out of water all the time didnt know if the whole angle and everything still applied

I haven't been on many boats (if any) that were immune to a wave slapping off the transom.

You need flappers. Consider them a 'must'. Fussy guys spend a little more for internal flappers.

Externals are less attractive, but easier to maintain or spot problems.