SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Reefmoto on January 12, 2017, 04:47:01 PM
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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
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi99.photobucket.com%2Falbums%2Fl282%2Fevo9guy%2FMobile%2520Uploads%2FIMG_0975_zpsa7ua1s7i.jpg&hash=6c74c95c48dda9863100140d38921facc772d80c) (http://s99.photobucket.com/user/evo9guy/media/Mobile%20Uploads/IMG_0975_zpsa7ua1s7i.jpg.html)
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Same price, but another option.
http://www.imcomarine.com/cal_store/4-flapper-valves-internal-pair.html
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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
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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.
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
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I built mine
The gates of hell
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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 ?
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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 ?
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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
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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.
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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
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