Like Tree0Likes

imco powerflow exhaust ?

Reply
Old 10-07-2002, 01:40 PM
  #11
GRH
Guest
 
Posts: n/a
Default

Quote:
Originally posted by WWW TOPDJ COM



I always thought if you changed the exhaust or put bigger air filters on that u had to check the fuel mix & timing, you know too lean or too rich
more air in and out is usually to lean? right
You're right of course about the exhaust allowing you to push more air through..... i didn't expirience a lean burn situation on my motor.... but I don't understand why the timing would be affected?
 
Reply With Quote
Old 10-07-2002, 04:52 PM
  #12
Toxic FORMULA
Platinum Member
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default

I put Imco Powerflows on my t/330's and picked up about 2 MPH and a few hundred rpm ...can't remember exactly after all I've slept since then
mopower is offline  
Reply With Quote
Old 10-07-2002, 05:19 PM
  #13
Charter Member
 
Join Date: Apr 2001
Location: Albuquerque, NM
My Boats: Baja 322 - Twin 540's
Posts: 606
Cool gains

Most of our customers have seen a 2 to 5mph gain depending on the package.

Don B.
tpmarine.com is offline  
Reply With Quote
Old 10-07-2002, 06:51 PM
  #14
Charter Member#203
Charter Member
 
Pete B's Avatar
 
Join Date: Oct 2000
Location: Ft.Myers, Fl/ Atlanta, Ga/ Worldwide
My Boats: 98 Scarab 302 Sport
Posts: 12,578
Default

[QUOTE]most of these aftermarket companies do little or no actual testing on a boat, be careful.


IMCO does extensive testing on thier equipment, both on dynos and in boats. they are also very helpful when in the middle of a project and you get stuck.
Pete B is offline  
Reply With Quote
Old 10-07-2002, 07:06 PM
  #15
Gone Fishin'
Charter Member
 
Waterfoul's Avatar
 
Join Date: Nov 2000
Location: Grand Rapids/Holland/Grand Haven
My Boats: 1988 Tracker Pro 17, 40 hp Mariner.....1972 Glastron GT 140, Merc 50 power!!!
Posts: 7,408
Default

Tyler Crocket has a lot of info on dyno tests on most aftermarket exhaust Chuck. Give him a call.

And you don't have an efi motor, so why do you care???
__________________
[b]M Go Blue.......Gator boots, gator luggage, gator purses... all at cut rate deals!!!!
Waterfoul is offline  
Reply With Quote
Old 10-07-2002, 07:22 PM
  #16
Platinum Member
Platinum Member
Trade Score: (1)
 
KAAMA's Avatar
 
Join Date: Oct 2000
Location: Western Michigan
My Boats: A boat?....What boat??? How about a galvarnized warsh tub wit a toranady strapped own da rear!
Posts: 4,329
Default

Saber28, well said.
KAAMA is offline  
Reply With Quote
Old 10-07-2002, 09:04 PM
  #17
DanL
Guest
 
Posts: n/a
Default

I have the Powerflow Plus headers on one of my 41's. The engines are tall deck,600inch, 685hp naturals. big,dumb,5100 rpm engines. 685hp with car headers on the Chief Engines dyno,680hp with the Powerflows on the same dyno. I had Stellings that were not repairable and spent $7500. between the headers and Stainless Marine-installed tailpipes for the short stagger. I feel like there is no difference between the two. the PP Plus headers have much longer primary and secondary runners. They are also around 3 7/8 exhaust diameter compared to the 4" exhaust size of the Stellings.
 
Reply With Quote
Old 10-07-2002, 09:53 PM
  #18
Smittymarine
Guest
 
Posts: n/a
Default

We run a P boat " Wazzup" 556cu.in. 730 hp. at 7200 rpm no power loss on Power flow and no dam leaks
 
Reply With Quote
Old 10-08-2002, 12:33 PM
  #19
Platinum Member
Platinum Member
Trade Score: (1)
 
KAAMA's Avatar
 
Join Date: Oct 2000
Location: Western Michigan
My Boats: A boat?....What boat??? How about a galvarnized warsh tub wit a toranady strapped own da rear!
Posts: 4,329
Default

Dennis Moore has address this a little in his book. Some of these manifolds have better primary designs than others and some have only a 2.5 inch collector even though they a 4" hose going out through the transom. Its weakest link of restricted flow is still the 2.5 inch collector.

Anyone ever here using/testing the new Stellings manifold design? I think it's a couple of years old...you can even get them with 5" tailpipes. I know Doctor Dave is running them on his Cig with blower engines. I wonder how they stack up to the tubular headers?

The KE's sound interesting as well.
KAAMA is offline  
Reply With Quote
Old 10-08-2002, 04:40 PM
  #20
Charter Member
Charter Member
 
Dean Ferry's Avatar
 
Join Date: Nov 2000
Location: Merritt Is. Fl. USA
My Boats: 2006 Hustler 388, 2004 Hustler Talon 25, 1999 30 Spectre cat and 2007 21' hydrostream voyager w/ Merc. 225 EFI
Posts: 6,580
Default

KE's all the way, they are just LOUD and $$, But have run mine 4+ yrs. in the salt water and they are still doing great. I put shotguns mufflers and that seem to help quiet them down a bit!
BTW, they are on an KE tuned HP500
Hope this helps,
MD
Dean Ferry is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mtocrs1
General Q & A
12
05-30-2006 11:16 PM
375stinger
General Q & A
5
02-10-2006 09:08 PM
Madcow
General Boating Discussion
2
07-17-2003 02:38 AM
Thunderboat
General Q & A
3
12-01-2002 11:16 AM
MIKE H
General Q & A
2
06-17-2002 02:00 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:10 PM.


Copyright 2011 OffShoreOnly. All rights reserved.