dry exhaust system
 

i have a thru transom wet exhaust system, and are wanting to change to a dry exhaust system. do you ahve to buy an entire new exhaust? new pipes? can i modify my existing exhaust ? thanks

Re: dry exhaust system
 

At most all you will need to do is get new tailpipes

Re: dry exhaust system
 

Looking to make friends? :D:D:D

Re: dry exhaust system
 

That might depend on what type or brand exhaust system you have.

Re: dry exhaust system
 

yep just tryin to make friends with my slip neighbors when i go out about 8 in the morning
im not sure the type of exhaust..it is one of the few things that hasnt been changed during the restoration, yet...... :D the headers are tubes (center is polished & outside engiens look to ahve been painted at one time) ill post some pics of exhaust later on my other computer. im tryin to see if it is possible to modify existing exhaust cuse im guessing it would cost some money to get 3 sets of pipes including the long center pipes.

Re: dry exhaust system
 

Why,are you having reversion problems or do you just want it to be LOUD? Tell us what kind of exhaust you have to start with. You might be able to modify it,Smitty

Re: dry exhaust system
 

I would make real sure you want to go dry before you go ahead and do so. If its merely for sound I think your making a big mistake. There are plenty of loud exhausts to choose from that arent over the top obnoxious (which is what you will get with dry)
I love the sound of a loud boat but they become a hassle to own when they are too loud.
Just my opinion :cool:
:chick:

Re: dry exhaust system
 

I really do not recomend dry exhaust these days. Much too loud. But, if you must....weld up the water holes in the tailpipes (leave a small drain hole in the bottom of the tail pipe) and have a 1" NPT bung welded to the top of the tail pipe. Connect a hose from the pipe to a through transom outlet to dump the water.

Re: dry exhaust system
 

My 500 EFI's came with CMI headers and silent choice exhaust.

When we had the engines out last winter I went with a dry setup.

Took out the silent choice and added straight tailpipes from CMI dumping the water at the end. It cost about $800.00 per engine for the tail pipes. Kept the same stock headers.

It sounds AWESOME, but it is loud. I have had a couple of complaints that we had never had from the stock system.

Good luck

Re: dry exhaust system
 

Dock, What you are running is thru hull exhaust. There are 3 basic versions of exhaust with headers.

Tip Style - this is where the where the boat has tips in the transom and the tailpipes stop prior to the tips and connect with a rubber hose. The water is introduced just prior to the tip.

Thru Hull - this is what you are running. It is where the tail pipes come off of the headers and continue thru the transom without the use of tips. The water is introduced at the very end of the tailpipe.

Completely Dry - these are like thru hull tails except that the water is never introduced into the exhaust steam. There is a seperate bung near the end of the tailpipe where the water is drained off and dumped overboard with a thru hull fitting.

Re: dry exhaust system
 

thanks zastrow .
here are the only pics i have (before redo)whereyou can see the exhaust

Re: dry exhaust system
 

LIGHTWEIGHT! :D :D

Re: dry exhaust system
 

Here's my transom. You can see the stainless holes on the transom where the water is diverted..... My exhaust and tail pipes are for wet application. Only difference is the water is diverted.

Re: dry exhaust system
 

At 45 seconds you will get a small taste of dry exhaust. I'll try to get some video of starting and revving at the dock. Stay tuned.

http://media.putfile.com/Neildriveby

Re: dry exhaust system
 

Think about this with a triple application, The pipes will be extremly hot without water......in cases you have to adjust something.

Re: dry exhaust system
 

Water is cooling the exhaust till just prior to the transom where it is diverted out.

Re: dry exhaust system
 

Mine with Lightning have a inner and outer tailpipe tube. The water cools the tailpipe without being entered into the exhaust gases. The water exits at the end of the tailpipe outside the boat. Outer is 5" and inner is 4.5" with thier glasspack baffle inserted.

Re: dry exhaust system
 

Heh, and people wonder why noise laws get passed, Duh. Boats with dry pipes are not doing the sport any good. I run wet exhaust and use mufflers in port even though there are not any noise laws in my area. Most people I know do this also so there is less chance of noise rules in the future. Boats with dry exhaust are way too loud and sound like crap in my opinion. Louder isn't always better.

Re: dry exhaust system
 

so is that a true dry pipe? It appears I have the same system you have..........and my chit is too loud.........

Re: dry exhaust system
 

I respect your opinion. The previous owner of my boat converted to dry to avoid reversion. My tail pipes do have the "gas shock" doors to close. They do make a difference when needed.

Neil

Re: dry exhaust system
 

Tripples. Dry. :eek: :eek: :drink:

Re: dry exhaust system
 

thanks for the info, glad to know it is not too big of a modification for the dry exhaust. now were just waiting to tear down the center engine and see wuts goin down. i understand a large amount of members do not recommend dry exhaust, but thats why we all have our own boats...if all boats were the same then thered be no fun to the sport :drink:

Re: dry exhaust system
 

Some applications must be dry. I know mine is recamended with 600ci's.

Re: dry exhaust system
 

Download this movie to see and hear Neil's dry pipes.

Click here to watch Neil's dry pipes.

Re: dry exhaust system
 

went dry this spring ....great if you have reversion problems but way loud all the time !

Re: dry exhaust system
 

I'll vouch for that - I was behind dyno's Sonic heading out of Grand Haven. You definitely know it didn't come out of the factory that way, and his motors are pretty mild.

Re: dry exhaust system
 

I HAVE FULL DRY LOVE IT. MINE SOUNDS LIKE THAT CLIP OF NEILS :D I HAD TO FLUSH MINE OUT LAST WEEK AT THE HOUSE THE GUY NEXT DOOR ALMOST **** HIMSELF WHEN I STARTED UP :eek: Ithought him and his wife was out it was 3pm I have shotguns but holding them up on the doesn't sound much different put there going on :rolleyes: for my wife :D .

Re: dry exhaust system
 

Yes

Re: dry exhaust system
 

Doed anyone make a tailpipe that has a 90-degree "bung" welded onto the inside of the tailpipe? I'm pulling off my CMI silent choice this winter and would rather divert the water into the exhaust path on the inside of the boat. ..

Re: dry exhaust system
 

call randy at stellings..........spoke to him yesterday..........my new tailpipes will be ready next week............mark...........he can make you whatever you need.............m.m...........

Re: dry exhaust system
 

Bob at Lake Precision Welding in Cleveland also does nice work at very reasonable prices. He used to do all the custom work for Gil.

I had some issues with reversion in my C.M.I. wet set-up. He reconfigured my tailpipes to dump the water at the very tip outside the transom. Completely resolved the reversion, but way to loud after about ten minutes. I'm adding GGB Extremes.

Re: dry exhaust system
 

TOO LOUD is not always cool. All it does is piss off people Then they complain and we have noise laws. I put mufflers on my boat and it still has that "rumble" to the sound, but it's much quieter. :D

Re: dry exhaust system
 

You're giving me flashbacks with that picture. :eek:

Pretty sure your boat is a 1991-92 with 540's...?? If so, I know way to much about that boat! Ear plugs a necessity.

Re: dry exhaust system
 

I went dry due to reversion with the new motors. Had to change the tailpipes and plumb the water discharge. Yes, the will cause you to make new friends.

Re: dry exhaust system
 

Your right, sometimes its totally awesome.... :drink:



F#CK EM! :drink:

Re: dry exhaust system
 

When I put mufflers on my rig it will be because I can't take it anymore, not because someone else can't take it... :drink:

Re: dry exhaust system
 

yep.............way to loud :( sounds good while running......but to loud for me

Re: dry exhaust system
 

Check into the Lightnings like I have. They build a 5" dry tailpipe with a glasspack built in kinda like your street bike has. Still not as quiet as wet exhaust but at least it's a little noise reduction. Thier priced alot better than CMI aslo. I paid $3800 for stainless powdercoated system complete. Same warranty.

Re: dry exhaust system
 

how do they protect water from coming back in? I have staight backs currently......no way to change from that, with out fiberglass work.

Re: dry exhaust system
 

Are you running any water into the mufflers to keep them cool or from turning colors?

I put 1/4" holes in my pipes to keep the mufflers cool but haven't had a chance to install them yet.