Muffler Update-loto
 

After Several Weeks Of Testing Various Manufacturers, Models, Every Combination And As Many As 2 Inserts And A Clampon On 1 Motor, Still Have Not Gotten To 90 Db's On A 1150ho Blower Motor With Wet Or Dry Exhaust. Got Close On The 850's At 95db's. I Really Believe Right Now The Under Water Turn Downs Qare The Quick Fix, Until Someone Can Make A Muffler That Can Comply, Also Performance Drops Have Been Severe With Multiple Muffler Applications. Going To Follow Dave Scott And Have Some Custom Turn Downs Made For The Nortech's. If Anyone Has A Better Solution Let Me Know. Thanks To All The Companies For Allowing Us To Demo There New Products, Getting Closer. Water Patrol Is Just Ruthless Will Not Allow 1 Decibel Over 90 Period.

Re: Muffler Update-loto
 

Clamp-ons won't fit my boat's tailpipes and you've proven inserts (made to date) are restrictive. Please keep us posted with info about the down-turns. Who's making them for you, costs, and photos too.
Mine will be interesting to make, since the tailpipes are siamesed. :rolleyes:
Thanks!
Due

Re: Muffler Update-loto
 

these are the answer.....

Re: Muffler Update-loto
 

Your Exactly Right Sean. They Work Great For Dave. Do You Like The 2 Coming Together Or The 4 Seperate For The Nortech Cats. Also Is Your Boat Going To Be Ready For Grand Lake Run, Let Me Know Would Like To Hook Up With You Guys. Thanks Jim. Ggb, Hpi And Gibson Can All Make The Turn Downs, They All Have To Be Somewhat Custom Made Because Cmi Pipes Are All A Little Different. Dont Yet Know Cost Would Guess 800$ Or So A Pair. They Work Until The Law Starts Doing A Running Test, But How Can They Check You Running When There Are 30 Boats Around You And Over 20,000 On The Lake.

Re: Muffler Update-loto
 

Jim,
My mufflers/tailpipes meet both the idle and running test. If you want to see turndowns that do not come together, check out my 36. On it we come straight down on either side of the drives. We did the 46 like pictured because we had to clear the support box for the Arneson drives.

Re: Muffler Update-loto
 

Jim,
The turndowns will be even more difficult to fit to boats that have steerable drives as they will need room for turning. The picture above is a rudder.

Re: Muffler Update-loto
 

Dave, So inside the tailpipe is a muffler as well or is it just a turn down?? Are the ends of the pipe out of the water when running???

Re: Muffler Update-loto
 

Yes, immediately after the tailpipe out of the transom is a 6" long muffler which then funnels into 4.5"OD tailpipes (without mufflers) which turn down. The ends of the exhaust pipe run above the waterline once on place. This setup is so quiet you wouldn't believe it. What is so cool is that regardless of the muffler manufacturer of your choice, the turndowns still work great and don't add any restriction. I think it is definately something to consider where noise standards are enforced.

Re: Muffler Update-loto
 

yes the steering of the drives and tie bars do restrict how the turn downs must go. I think after speaking with Sobo we will have to return back towards transom after rub rail, will probably go 4 down like Daves 36, It actually looks pretty cool the way he did it. . jim

Re: Muffler Update-loto
 

My creation worked well until I blew a flap off this weekend. The water mixes in the down pipe with a baffle insert.

Nice to talk with you Jim.

Mark Smith
Chi-Town Hustler