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Internal exhaust flappers?

 
Old 05-10-2017, 05:16 PM
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Default Internal exhaust flappers?
Are these the ones I want to use or is something better? 3 1/2 in
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Old 05-10-2017, 08:31 PM
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There was just a similar thread recently. Personally I don't like them and you'd think they'd ulter/restrict exhaust flow some. I can't say for sure however I just don't like anything in my exhaust. Ext flappers way to go unless you have under 112 lsa.
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Old 05-10-2017, 08:42 PM
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I've seen a lot of 4in stuff but not much on 3 1/2.

For externals I like these from Harden but I can't find them in 3 1/2 inch
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Old 05-10-2017, 10:22 PM
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Just did a search myself and appears your correct. Those newer internal ones with the stainless / rubber evidently hold up much better the older ones. Not a lot of options.
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Old 05-10-2017, 11:33 PM
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IMCO make a 3 1/2" internal flapper. There are not a lot of options, if any for clamp on ones.
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Old 05-11-2017, 05:53 AM
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Originally Posted by nova26
I've seen a lot of 4in stuff but not much on 3 1/2.

For externals I like these from Harden but I can't find them in 3 1/2 inch
I have these on my boat and I love them. Way better then the rubber ones
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Old 05-11-2017, 05:54 AM
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[IMG][/IMG]
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Old 05-11-2017, 06:57 AM
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Originally Posted by nova26
Are these the ones I want to use or is something better? 3 1/2 in
Buddy shattered a piston and punched a hole in the cylinder running these rubber internal flappers. After a bit of use they do not want to lay back flat. Stainless butterfly with the silicon boots for internal. Just need to peak up the tips occasionally as even those can toss a flapper without you knowing it.
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Old 05-11-2017, 07:29 AM
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Did the same on our past 2 boats
[ATTACH=CONFIG]567300[/ATTACH][ATTACH=CONFIG]567301[/ATTACH]
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Old 05-11-2017, 07:33 AM
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Originally Posted by nova26
I've seen a lot of 4in stuff but not much on 3 1/2.

For externals I like these from Harden but I can't find them in 3 1/2 inch
Why don't you take the tips off the boat and have a local custom exhaust fabricator swage the ends to 4"? That way you will have options.
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