supertrapp exhaust

A discussion on ways to reduce it.
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harvey
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supertrapp exhaust

Post by harvey »

Here is a picture of my exhaust. It is simple but effective. All of the hardware is outside of the hull, therefore there are no bolts, clamps, or hardware to come loose and get into the prop. My boat is quieter than my lawn mower. I'll post some db numbers when I get a chance.

Image

Rich Andrews
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Post by Rich Andrews »

keep the info flowing.....I'm looking forward to quieting mine real soon
Big Ole Deckover in the making...

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cowboy
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Post by cowboy »

Looks good Harvey.
There real quiet huh?
What do they cost, and got any part numbers from supertrapp?
How many disks installed?
How's the engine performance with and with out them? Any noticable difference good or bad?

Those look like they could be very easily adapted to most any boat, right at the end of the existing flex, or through the transom like yours.

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BigBoom
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Post by BigBoom »


rjonesboy
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Post by rjonesboy »

I installed a set of these on my Alumitech a couple of months back. Very clean installation. They are available from summit. They are called SuperTrapp disc-only adapter kits and cost about $60 each. They come with 12 discs each which makes my GPU very quiet. More discs=less backpressure=more noise and vice versa. I used the endcap heatshields also which are an extra $16 each. They slid right over my thru-hull exhaust flanges. With the 12 discs on the GPU I had no rpm change at WOT but it seems to have a little more power off idle. Hope this helps

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cowboy
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Post by cowboy »

Thanks Guy's
I just received the mufflers I had ordered for my boat.
I'm gonna get a set of those trapps for one of the other boats we have around here, and see which are better.

I sure like the looks of those, light, and small. If the work well to quiet thing down, then they may be the hot deal.

Thanks for the link Boomster

See ya

mwood7800
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rjonesboy

Post by mwood7800 »

what size are the disc, are they 3 in ?

rjonesboy
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Post by rjonesboy »

I used the 4 inch. Looks like Harvey may have 5 inch.

cfth
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Post by cfth »

Dixon sells the whole set up for the boats and tells you how many discs to run. There has been a few threads about this quite a while ago. According to him with the right set up on a 540 you picked up a few RPM's. I think looks like a pretty good set up personally. I would definatley be interested in knowing how much it quiets the boat down as well.

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Post by passtime »

putting mufflers on my boat for the 27 th Melbourne run. do you add inline mufflers also?
Larry

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Post by WallyGator »

I am trying to call Dixon to find out how many disk to use in my 0540 angle valve. The numder on the web site will not go. Does anyone have a good number?.I have givenup on building a exhaust for now no time. have partts but no time.
Never turn your head ,life's to short to look back.

Cancer Sucks

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harvey
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Post by harvey »

18 on each side. Dixon's # 229 246 5760

WallyGator
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Post by WallyGator »

thanks
Never turn your head ,life's to short to look back.

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marshmaster pat
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Post by marshmaster pat »

Harvey - Did you ever do a test to measure db? Let us know, I really like that set up.

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harvey
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Post by harvey »

No, I'm sorry. I did measure my lawnmower ( I could do that by myself) I think it would not be legal in FL. I'll take my meter to the ride this weekend and maybe someone can help me take some readings and I'll post them as soon as I get back.

cntry141iq
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Post by cntry141iq »

Harvey: you bring your meter and I guarantee you readings will be made if you want them. If basket brings his the we can get side and rear at same time maybe. I have a surveyor type tripod but have no way to mount meter except maybe a bugee cord. If someone else has ideas lets get them on here.
Don't waste your time ... it is the only thing you can't get more of
.. if it accidentally looks like I gave advice please ignore it .. and notify me immediately

Guest

Post by Guest »

Great idea on the dB reading for anyone interested. Just remember to take them at 50'.
FYI: when the prop speed surpasses .67 the speed of mach (prop 2200-2400, depending on prop) the prop sound overtakes the exhaust sound. The mufflers give you the reduction in the low & mid range (operational) rpm range.
Most boats with mufflers, spinning the prop 1600-1900 rpm should be 90 dB or less at 50'. See what results you get.
Quieter boat means happier deer & hogs............

Guest

Post by Guest »

Harvey- I'm going to run Lake Seminloe Saturday after the Ga. DNR gator seminar in Albany. Know anyone that may want to ride & show me around the lake?
Thanks,
PW

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harvey
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Post by harvey »

Sorry this took so long:but, here's the db readings on my boat. 0540 with three blade Sensenich. All the readings are from 50' from the back of the boat.
750 rpm---81
1250rpm---83
1500rpm---84 (I cruise around 1500 )
1750rpm---86
2000rpm---95 (at 2000 I blew the dog over--- I'll get the 2500
reading when I have some help---afraid the boat
was going to get away)

Anyway---With those #'s and a little common sense and courtesy,I think that's a good start. I'd have no trouble getting on plane and running all day (usually) staying well under 90db and 50'

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harvey
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Post by harvey »

Hey Gatorstick---Just sent you a PM on Lake Seminole---Hope I'm not too late---just saw it tonight.

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