Exhaust/Mufflers
12-17-2007 | 11:15 AM
#11
Gold Member
Joined: May 2002
Posts: 1,127
Likes: 0
From: DFW
Smitty, Just a thought for your turn downs,I've considered an adjustable plate/perforated grate that slides over matching slots/holes in the elbow.
The design would serve back pressure as the tips are under water (addressing reversion) and subject to perforation/louver design, influence exhaust tone.
Show us pictures or at least,keep us posted.
The design would serve back pressure as the tips are under water (addressing reversion) and subject to perforation/louver design, influence exhaust tone.
Show us pictures or at least,keep us posted.
12-17-2007 | 06:53 PM
#13
Thread Starter
Registered
Joined: Nov 2003
Posts: 825
Likes: 30
From: Antioch, IL
I modified a set of stainless 5" HPI's by cutting 90 degree stainless tubing and welding to HPI out lets.
They are very quiet even at speed all you here is blower wine.
They did however bring our EGTs on our 1300hp engines up to an unacceptable temperature level at high rpm.
I believe the HPI's would work well up to 1000hp or or so as they are similar to my GGBs and they worked real well on my Gun with 850HP mills with no noticeable power loss and acceptable EGT's..
Good Luck, I'm still searching for something that will work on my set up, I would be happy with 100dbs at idle.
They are very quiet even at speed all you here is blower wine.
They did however bring our EGTs on our 1300hp engines up to an unacceptable temperature level at high rpm.
I believe the HPI's would work well up to 1000hp or or so as they are similar to my GGBs and they worked real well on my Gun with 850HP mills with no noticeable power loss and acceptable EGT's..
Good Luck, I'm still searching for something that will work on my set up, I would be happy with 100dbs at idle.
Me too, IL. law is 90 and the dB police sound like their perking up this year.
12-21-2007 | 10:47 AM
#17
Registered
Joined: Feb 2005
Posts: 64
Likes: 0
From: Aurora Indiana
Hey Rbeyer, I just bought and installed a set of short barrel through transom Zoomers on my boat. The hot boat article on mufflers was March 2005. Zoomers supposedly helped top speed when installed on a boat. I feel that isn't very probable, but I hope the loss is minimal. They look good to me, all 304 stainless construction, I saw a thread on hot boat where someone was complaining of corrosion issues after one season of freshwater use. Hope its not true, I will see this coming summer.
I decided to give them a try after reading the hot boat article. I got a great deal on them from Trick Marine- 275.00 shipped to my door. Really. (I know I probably just ruined this thread.) Anyway I will let you know what I think of them when I can first test them.
I decided to give them a try after reading the hot boat article. I got a great deal on them from Trick Marine- 275.00 shipped to my door. Really. (I know I probably just ruined this thread.) Anyway I will let you know what I think of them when I can first test them.
12-21-2007 | 12:56 PM
#18
Banned
Joined: Aug 2002
Posts: 5,658
Likes: 1
From: IL
Rob -
The CMI Sound Elimination Mufflers work great honestly.
Muffled at idle and open while running yet take the bark out of the exhaust.
Zastrow ran them right around 900 HP and passed with Lake County.
Let me know what size and if you want clamp on or transom mount and I'll get you pricing. Email me at [email protected]
Merry Xmas,
Kirk
The CMI Sound Elimination Mufflers work great honestly.
Muffled at idle and open while running yet take the bark out of the exhaust.
Zastrow ran them right around 900 HP and passed with Lake County.
Let me know what size and if you want clamp on or transom mount and I'll get you pricing. Email me at [email protected]
Merry Xmas,
Kirk
12-21-2007 | 01:03 PM
#19
Registered
Joined: Jan 2004
Posts: 3,255
Likes: 17
From: Bay Area, CA
I'm happy to say we do sell GGB. The Extremes are no longer available only an insert. It's too bad, the Extremes where a great product for most applications. I think they ran into some QC issues with a few and then dropped the design.
12-21-2007 | 07:13 PM
#20
Registered
Joined: Feb 2004
Posts: 187
Likes: 0
From: Villa Park, Ca
zoomers
I run Zoomers on a Whippled HP 500 in a 2750 Lavey- runs in the low 90's speedwise. Sound is fine(not as nice as before tho) and the noise police never give me a second look. Don't think they affected performance at all.
