Null


Pages: [1]

Reefmoto

  • Karma: +0/-0
4" Internal Exhaust flapper
« on: January 12, 2017, 04:47:01 PM »
Im searching for the internal exhaust flappers, and found them on hardin marine and cp performance.  My biggest question is are there any other places to get these like ebay or amazon? $80 for 2 is really pricey considering i can get new 4" tips with flaps for 125, or get the a flat cut tip for even less. any advice would be appreciated
http://www.hardin-marine.com/p-12576-4-internal-butterfly-style-rubber-replacement-exhaust-flapper.aspx
4" Internal Butterfly Style Rubber Replacement Exhaust Flapper


Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

JordanDangerfield

  • Karma: +41/-0
Re: 4" Internal Exhaust flapper
« Reply #1 on: January 12, 2017, 05:13:10 PM »
Same price, but another option.

http://www.imcomarine.com/cal_store/4-flapper-valves-internal-pair.html




Sent from my iPhone using SoCal Jet Boats
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

crusader1

  • Karma: +2/-0
Re: 4" Internal Exhaust flapper
« Reply #2 on: January 12, 2017, 05:39:32 PM »
That's pretty much the going rate. I tried to find other options when I replaced mine to. What got about two years before they started falling apart again. So I cut the tips and went external flaps. They may not look as cool but they last forever and they are actually quieter. You don't get that exhaust rattle out of them. Just my 2cents


The gates of hell
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

Reefmoto

  • Karma: +0/-0
Re: 4" Internal Exhaust flapper
« Reply #3 on: January 12, 2017, 05:45:34 PM »
that's what I thought, I have a bunch of amazon gift cards id use if I found something that matches that on amazon, but i cant find anything... I think ill just go external flap.


Quote from: crusader1 on January 12, 2017, 05:39:32 PM
That's pretty much the going rate. I tried to find other options when I replaced mine to. What got about two years before they started falling apart again. So I cut the tips and went external flaps. They may not look as cool but they last forever and they are actually quieter. You don't get that exhaust rattle out of them. Just my 2cents


The gates of hell
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

crusader1

  • Karma: +2/-0
Re: 4" Internal Exhaust flapper
« Reply #4 on: January 12, 2017, 08:03:38 PM »
I built mine


The gates of hell
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

Jeff@reliablesvc.com

  • Karma: +6/-0
Re: 4" Internal Exhaust flapper
« Reply #5 on: January 12, 2017, 11:36:18 PM »
Might be a dumb question but what do the flappers do ? Been without for the past 3 years. I'm thinking they help slow down water from entering back into exhaust when not running ? Or ?


Sent from my iPhone using SoCal Jet Boats
Logged
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

GT Jets

  • Karma: +192/-0
Re: 4" Internal Exhaust flapper
« Reply #6 on: January 13, 2017, 06:02:35 AM »
Quote from: Jeff@reliablesvc.com on January 12, 2017, 11:36:18 PM
Might be a dumb question but what do the flappers do ? Been without for the past 3 years. I'm thinking they help slow down water from entering back into exhaust when not running ? Or ?


Sent from my iPhone using SoCal Jet Boats

They actually work like check valves to help cancel out the exhaust pulses to prevent reversion. Reversion is when small (or not so small) amounts of water get brought back into the exhaust valve during valve overlap at idle.

Just so you can see what is happening,  idle your car and take a piece of notepad paper and place or over the tip of the tailpipe.

Report back and let us know what you witness. You may be very surprised.

GT
Logged
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

RojoRick

  • Karma: +5/-0
Re: 4" Internal Exhaust flapper
« Reply #7 on: April 17, 2017, 09:59:59 AM »
Quote from: GT Jets on January 13, 2017, 06:02:35 AM
They actually work like check valves to help cancel out the exhaust pulses to prevent reversion. Reversion is when small (or not so small) amounts of water get brought back into the exhaust valve during valve overlap at idle.

Just so you can see what is happening,  idle your car and take a piece of notepad paper and place or over the tip of the tailpipe.

Report back and let us know what you witness. You may be very surprised.

GT

If the tips have internal flappers, are the externals really necessary? Particularly on a lower hp motor without much valve overlap.
Logged
  • Boat #1: 1990 Carribean 21'
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

GT Jets

  • Karma: +192/-0
Re: 4" Internal Exhaust flapper
« Reply #8 on: April 17, 2017, 10:06:09 AM »
Quote from: RojoRick on April 17, 2017, 09:59:59 AM
If the tips have internal flappers, are the externals really necessary? Particularly on a lower hp motor without much valve overlap.
One set of exhaust checks only.

GT

Sent from my SM-G900V using SoCal Jet Boats mobile app

Logged
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray
Pages: [1]
 


Null

SMFPacks CMS 1.0.3 © 2026