2.5 280 Capping Open Exhaust Mid-Section?

I'm almost certain there will be changes in tuning as well. When I went offshore mid on my carb motor I had to reset all the idle fuel and timing to get it back idling correctly.

Sell the mid, make a few bucks, find bass mid. Don't kill a nice offshore mid.

Rock

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Originally Posted by KIRCHNER

I fabricated a hinged, aluminum plate, counterweighted on the bottom, with peel n stick whl weights. a idle it ppens about 1/3 way, more rpms, it swings wide open. i tune it by adding +- weights. i used BMW weights, little neat cubes across the bottom, pre-finished. looks cool at idle, in reverse it closes. the door ma\\\\tches the snout shape. my 15 is a ridgebk, about 3.5''x3.5'' exit.

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Pics from KIRCHNER himself:

Attachment 522711Attachment 522712Attachment 522713Attachment 522714Attachment 522711

Keith

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Originally Posted by Keith E.

Thanks for checking in. I was looking for the particular brand of boat and found one that had the 280.

I was told by a reliable source that redirecting the exhaust would not make that much of a difference in performance and would not cause a problem. I posted the questions here in order to get more opinions, options & ideas, all of which all are appreciated. My intentions are to consider them all and develop a better-informed plan of action.

Thanks,
Keith

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from what others are saying I am incorrect. And the motor will run OK without the open exhaust. If that’s the case, maybe you just wanna put it onto a 20 inch mid with a 20 inch lower and put away the valuable fast stuff for later. But that motor and that high performance 15 inch mid and lower unit are expensive pieces. You can get a couple of standard motors for that guy.

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Originally Posted by Baker343

Have someone weld a plate back on to divert the noise back down as it came originally, will not hurt performance,

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Baker,

It has always been an open exhaust.

Thanks,
Keith

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Originally Posted by derekfl

Are you buying the boat for the motor or the hull? Cuz that motor will cop a major league attitude if you make it breathe out thru the prop. Either live with it or sell the motor and buy a couple-3 20 inch 200’s with the proceeds and go slower.

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Derek,

I'm not sure about the feasibility of multiples on an Allison XB2002. 😁

Thanks,
Keith

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Originally Posted by tlwjkw

you could plug it then drill tha 10 holes above tha cav plate makin' it equivalent ta tha hi perf "bass" can?.. might ask around about a trade with one of tha racers................... jus hate it when someone does that to a nice can.........:rolleyes:. jus for a lake motor.

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tlwjkw,

I plan to hold onto the factory 15" mid. Gotta start collecting parts for future projects sometime, right?

Thanks,
Keith

Heres a couple pics of mine. I bought it like this

Attachment 523340 Attachment 523341

that will buff right out!!!.. MAYBE?.. they came with a block off plate... at least its still all there!

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Originally Posted by tlwjkw

that will buff right out!!!.. MAYBE?.. they came with a block off plate... at least its still all there!

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LOL I was worried that it was going to have siezed bolts when I bought it but everything is smooth nothing locked. A little of the ol sandlblast, alodine, prime and epoxy paint she'll be good as new

Keith. I wasn’t saying put 2 motors on the boat. I meant one to run and one spare. Probly couldn’t put 2 9.9’s side by side on that transom!

here ya go........

I like quiet .. until I don't .. ;)

Major twiste .. cut three times .. :smiletest:

https://i.imgur.com/gwxCpiLl.jpg

https://i.imgur.com/Ta1xAXBl.jpg

Baby boomer ... :eek:

https://i.imgur.com/JyYY1kfl.jpg

Farfignugen outboard ... :p

https://i.imgur.com/U8EC37Ll.jpg

Set-back / three ram / fifteen inch / 3.2L :leaving:

https://i.imgur.com/1zX7WPzl.jpg

Nother-in ... :)

https://i.imgur.com/98asjNJl.jpg

Ifin ya get to old to listen to the music .. I rekon ya can build a muffler .. :o

https://i.imgur.com/8fyiylel.jpg

Is this OEM?

Attachment 523566

Thanks,
Keith