Going to Thru hull exhaust

[boatingtattman]

I have a 1999 Searay 215 express cruiser with a 5.0 mercruiser and a alpha 1 outdrive. I was thinkingh of converting it to thru hull exhaust and everything is stock now. Is there is a way around spending thousands of dollars and getting headers ect or can i use my existing ex. manifolds and risers. i was thinking maybe i can buy just the tips and run that exhaust hose from the riser thru the transome to the tips..Can someone please let me know if this is possible?
i also have a 1978 hawaiian jet boat with thru hull and it looks like that is how they got it run on that boat..thank sin advance for your help

 

[Bondo]

Re: Going to Thru hull exhaust

Ayuh,.... The manifolds, 'n risers don't care whether it's thru-prop, or thru-hull,.....

So long as it's All downhill....

 

[boatingtattman]

Re: Going to Thru hull exhaust

Ayuh,.... The manifolds, 'n risers don't care whether it's thru-prop, or thru-hull,.....

So long as it's All downhill....

so i should be able to do it the way i was talking about? the way it is run thru the prop now, what do i have to buy to be able to plug that up..do they make something

 

[tpenfield]

Re: Going to Thru hull exhaust

Yup, your fitting that goes through the hull is what will be different.

you can decide whether to use the outdrive exhaust or just close things up at the transom assembly.

If you go with both thru-hull and outdrive exhaust, you will need a 'Y' pipe to split the flow.

 

[picklenjim]

Re: Going to Thru hull exhaust

what do i have to buy to be able to plug that up..do they make something

You'll need an exhaust block off plate. Here is a nice one that is stainless steel and is cheaper than most others. Usually their aluminum and go for around $45. The aluminum ones end up rotting away.
Teague Custom Marine TCM STAINLESS EXHAUST BLOCK-OFF PLATE - Exhaust Flapper - Exhaust Accessories and Related - EXHAUST

Do a search for "Alpha exhaust block off plates" and compare.

 

[81 Checkmate]

Re: Going to Thru hull exhaust

I put thru - hull on my Celebrity boat at the end of last year. And i hate it.... Tho my 22 yr old son loves it. Way too load for me!

So here is what im doing over the winter to quiet it down...... All hand made and all i bought was the exhaust hose.





Now i can shut them off and direct it down the Y pipe when i in the boat!

Good Luck!

 

[haulnazz15]

Re: Going to Thru hull exhaust

I put thru - hull on my Celebrity boat at the end of last year. And i hate it.... Tho my 22 yr old son loves it. Way too load for me!

So here is what im doing over the winter to quiet it down...... All hand made and all i bought was the exhaust hose.

Now i can shut them off and direct it down the Y pipe when i in the boat!

Good Luck!

Lol, poor-man's Captain's Call exhaust diverter! Look good to me, a little difficult to change without a screwdriver, but whatever works!

 

[81 Checkmate]

Re: Going to Thru hull exhaust

Yea.......Poor man Switchable exhaust!

The noise is just Obnoxious when on plane...sounds good at the dock.......

Flick of the switch and no noise (Lift engine cover 2 sec, undo 2 screws.. flip diverter.. reinstall screws 10 sec) Priceless!
+ i saved $1000.00 Dollers. :joyous:

 

[emilsr]

Re: Going to Thru hull exhaust

so i should be able to do it the way i was talking about? the way it is run thru the prop now, what do i have to buy to be able to plug that up..do they make something

They do; it's a block off plate that gets mounted on the transom assembly after you remove the bullhorn. This would require engine removal. If you're up for that, the thru hull is a pretty cheap/easy change.

My suggestion (FWIW) is to just convert to what Corsa refers to as "Quick and Quiet II". This is both through hull and through prop exhaust through a non-switchable diverter (y-pipe). In your case, get the diverters (sometimes you can find them on ebay pretty cheap), the tips and a short length of hose. The diverter plugs into your existing bullhorn so you wouldn't have to pull the engine to do it. Unlike switchable diverters there's nothing to break; that's a plus. The worst part is drilling 4" holes in your transom. :lol:

If you're doing this for the sound you'll like it. If you're doing it for increased performance you may be disappointed.

 

[haulnazz15]

Re: Going to Thru hull exhaust

Lol, yeah "may be disappointed". More like absolutely will be disappointed if any performance gain is expected!

 

[Black as]

Re: Going to Thru hull exhaust

You can buy rubber exhaust hose, clamps stainless exhaust tips and stainless steel elbows off eBay, can I suggest you go 100mm dia / 4" it’s a lot quieter and you get a deeper note. If you want to fit a plate at the bottom end of your "Y" pipe adapter the engine will have to be pulled out to fit it. I did this to my boat for a few hundred dollars and it sound great.

 

[HT32BSX115]

Re: Going to Thru hull exhaust

I put thru - hull on my Celebrity boat at the end of last year. And i hate it.... Tho my 22 yr old son loves it. Way too load for me!

So here is what im doing over the winter to quiet it down...... All hand made and all i bought was the exhaust hose.


View attachment 177179View attachment 177178View attachment 177180View attachment 177181


Now i can shut them off and direct it down the Y pipe when i in the boat!

Good Luck!

Nice to have your very own TIG welder isn't it?


I just LOVE my Miller Synchrowave 180!

 

[boatingtattman]

Re: Going to Thru hull exhaust

i am ddoing it just for the sound..i know it wont get me any hp out the deal..thanks for everyones help..i called corsa and they wanted like $1500 just for the silent choice..thank all of you

 

[emilsr]

Re: Going to Thru hull exhaust

i am ddoing it just for the sound..i know it wont get me any hp out the deal..thanks for everyones help..i called corsa and they wanted like $1500 just for the silent choice..thank all of you

That's for switchable. Non-switchable is much cheaper.