Exhaust systems

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12-30-2015, 02:12 PM

#31

mickeymcclgn

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Quote:

Originally Posted by endeavor1

JMO . . . Loud pipes annoy blow boaters

and don't cause OSO arguments

There fixed it for you

12-30-2015, 02:28 PM

#32

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Quote:

Originally Posted by MILD THUNDER

Anyone ever test say a stainless marine, emi, imco, style manifold against a header at the 650-800hp N/A range ?

Not really answering your question, but worth mentioning

KE's beat them all at 500hp - many tested on a stock HP500. As they should.
2" x 34" primaries. 4" collector.

I'm confident they'd kick ass against the others up thru N/A 650hp anyways.

Last edited by SB; 12-30-2015 at 03:28 PM.

12-30-2015, 02:34 PM

#33

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I'm sorry. They are now Diamond Marine's Thunder N Lightning Exhaust
http://www.diamondperformanceparts.c...cat=282&page=1

Quote:

Originally Posted by SB

Not really answering your question, but worth mentioning

KE's beat them all at 500hp. As they should.
2" x 34" primaries. 4" collector.

I'm confident they'd kick ass against the others up thru 650hp anyways.

12-30-2015, 02:35 PM

#34

Baja Rooster

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Quote:

Originally Posted by horsepower1

While a blower engine may not benefit from a tuned exhaust, it's processing a lot more air and fuel and still needs a good exhaust system and will benefit just like any other engine. The manifold, while not tuned, may not be as much of a restriction on the smaller engine as it would on the larger blower engine and that restriction will kill power on the blower engine.

Manifolds/back pressure also increase engine heat, no?

Exhaust tips can be an overlooked item. The stock Corsa mufflers on my 272 were killing my 502.

12-30-2015, 02:37 PM

#35

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Quote:

Originally Posted by Baja Rooster

Manifolds/back pressure also increase engine heat, no?

Exhaust tips can be an overlooked item. The stock Corsa mufflers on my 272 were killing my 502.

Yup, GGB custom inserts killed a mild small block almost 2mph !

edit in: their old spiral style they haven't made for years.

Last edited by SB; 12-30-2015 at 03:27 PM.

12-30-2015, 03:03 PM

#36

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Quote:

Originally Posted by SB

Yup, GGB custom inserts killed a mild small block almost 2mph !

SB, which GGB inserts (dia and length)? I've found them to be non-restrictive. Others not so much.

12-30-2015, 03:26 PM

#37

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The old spiral one's they made when GGB first came onto the scene. A few years later they came out with their open style.

12-30-2015, 03:31 PM

#38

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Quote:

Originally Posted by SB

The old spiral one's they made when GGB first came onto the scene. A few years later they came out with their open style.

Got it. I'm using the 4" diameter 'performance' 4 or 5 ring open style. They knock about 6dB off the sound, make a better sound, and have not been restrictive in the least bit. The CP inserts on the other hand squashed about 500 rpm off the big end.

12-30-2015, 03:34 PM

#39

ICDEDPPL

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Quote:

Originally Posted by vintage chromoly

Another thing I was wondering about.....
My "dry" tails have six 3/8" water outlets right at the tip. I was considering welding those shut and welding in bungs near the ends of the tails and dumping the water that way.

Is there any advantage to either way of expelling the water? Can the water migrate back up the tailpipes even when it's introduced at the very tips of the pipes?

I`ve found it depends on how long the tail is .. My STEROID headers the collector was so far back there was a short tail and it reverted. The collector would be soaking wet... worse with mufflers closed. Had to buy a bunch new valves this year due to pitting from reversion. The current SM Gen 3 have a long tail and no issues whatsoever.

I do dump overboard from inside the boat but have a hole inside the tail at the end to keep the mufflers from burning up.