6BTA exhaust question

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Rawleigh
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Post by Rawleigh »

Good Lord Mikey, where is it coming from China???
Rawleigh
1966 FBC 31
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Bruce
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Post by Bruce »

Mikey,
Here are two pics of the exhaust I did on the last 31/Cummins install. While they are QSB's, the BTA has the same dimensions.
I left them big to let you see detail.
bruce



Image,
Image
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Mikey
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Post by Mikey »

Bruce,
Nice installation! I will use some of your technique, but my problem is the space between the end of the turbo and the new Cabrera engine boxes. Don't want to hack away at them if possible. I can hear Spanish cursing from here. The exact dimension is not yet known but it is about 5" total.
Also what do you think of this talk of running 6BTA's without mufflers? It would simplify matters but I'm worried about noise. If I opt for the straight pipes and since I have to buy the pipe anyway what about 6" over 5" out the stern? Damn, I am being a nuisance about this but only want to do it once.
Thanks
Mikey
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3/18/1963 - -31-327 factory hardtop express, the only one left.
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Mikey
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Post by Mikey »

Rawleigh,
Worse that China . . . California!
Mikey
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3/18/1963 - -31-327 factory hardtop express, the only one left.
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Capt. Mike Holmes
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^ BTA Exhaust

Post by Capt. Mike Holmes »

Mikey, yes, a friend of mine with 6BT's in a 36 Trojan turned one turbo over - but he has lot's of room in his engine room. Don't remember which brand the flaps were. I'll look at the bag the next time I go to the boat, probably tomorrow evening. Spent all day with her. Changed fuel filters this morning, then hauled for a pressure wash and to clean the props. Been too long since I did this, never had that many barnacles before. I test ran Saturday, only got 15.7 Knots, 2500 RPM. After grinding all the shellfish off today, I got 25.7 knots at 2800 rpm. I'm happy.
"There is nothing quite so satisfying, as simply messing around in boats."
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Bruce
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Post by Bruce »

The water in the exhaust cuts quite a bit of noise and I don't think that the noise without mufflers is annoying.
Besides unless you are super insulating the engine box and surrounding spaces, the BTA series has enough static noise anyway.
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Capt. Mike Holmes
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BP

Post by Capt. Mike Holmes »

Bruce, sort of like, you fine me for safety and environmental problems, and I'll cut off your oil. The oil company I work for just reported 2nd quarter earning up 18% over last year, which was up 16% over the year before that - which was a record setting year for profits in itself. Rank and file employee raises rose about 1.5 - 3% each of those years, Where do the money go?
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mike ohlstein
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Post by mike ohlstein »

Bruce,

That high dollar blue hose is so slick, it keeps blowing off the turbo in my truck. Any similar instances on the boats?
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Bruce
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Post by Bruce »

Mike,
I havn't had a problem with that in marine applications.

You might try taking some 30 grit paper and rough up the surface where the hose goes on and use ABA clamps.

I always wipe the hose and surface with denatured alcohol when assembling.

Last resort would be to use some permatex red aviation gasket glue.
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