Exhaust/Mufflers
12-16-2007 | 06:56 PM
#2
VIP Member
Joined: Apr 2001
Posts: 4,213
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From: Chicago il
I'm currently working on building some turn downs with mufflers built in. I run on the Chain as well and as you know noise is the hot topic right now. I will try to keep you posted with details. I plan to market my design soon for local guys. I am also building some 850 hp motors so what I design should work for you as well. I am hopefully going to be 50% less cost than what is out right now.
Smitty
Smitty
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Want your ECU tuned right?? Call Mark at Precision www.pmefi.com
Want your ECU tuned right?? Call Mark at Precision www.pmefi.com
Last edited by Smitty; 12-17-2007 at 08:48 AM.
12-16-2007 | 08:32 PM
#4
Registered
Joined: Nov 2001
Posts: 116
Likes: 0
From: Pompano Beach, Florida
Exhaust/Mufflers
I recently tried the CMI Sound Elimination mufflers. Quiet @ idle and open up as exhaust pressure increases. Not quite as loud at WOT. No loss of performance. 540 600 hp motors in 35' Cig.
12-16-2007 | 09:34 PM
#5
I hate the winter!!
Joined: Jul 2001
Posts: 2,707
Likes: 0
From: long island, new york
12-16-2007 | 10:50 PM
#7
Charter Member #601
Joined: Dec 2000
Posts: 3,276
Likes: 5
From: Holland, Mi USA.
I am running 4" Bola SS mufflers and Drew shotguns. 88dba at idle, takes the bite out of the wot.. breaths freely. Not the prettiest, but it is functional. The noise cops havent pulled me over yet...
12-17-2007 | 05:14 AM
#8
Registered
Joined: Nov 2004
Posts: 922
Likes: 54
From: Lago Vista TX
I'm running GGB's with turndowns...
600 hp 509 with Keith Eickerts.
Only 83 db's at idle, NO power loss..
[YOUTUBE]<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/oxkANBpSuKo&rel=1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/oxkANBpSuKo&rel=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>[/YOUTUBE]
I see GGB's website is up again... don't know if their still in the "marine" side of things though...
http://ggb.ca/
Doug
600 hp 509 with Keith Eickerts.
Only 83 db's at idle, NO power loss..
[YOUTUBE]<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/oxkANBpSuKo&rel=1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/oxkANBpSuKo&rel=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>[/YOUTUBE]
I see GGB's website is up again... don't know if their still in the "marine" side of things though...
http://ggb.ca/
Doug
12-17-2007 | 06:19 AM
#9
Registered
Joined: Jan 2005
Posts: 4,817
Likes: 373
From: IL
12-17-2007 | 07:22 AM
#10
Platinum Member
Joined: Aug 2004
Posts: 396
Likes: 1
From: PA/ MD
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.
