Twins with Twins, Anyone?

DAVe3283

Heavy & Slow
Sep 3, 2009
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Boise, ID, USA
care to elaborate :confused:
I think he's saying the exhaust will be reinforced to keep turbine parts inside the pipe, not flailing about the boat where they can injure people.

Putting the throttle blades (air shutoff) as close to the Y-bridge as possible maximizes the chance it will still be able to shut down the engine if something grenades. If you put an air shutoff before the turbo, and blow a cold side pipe, you can't stop a runaway.
 

NC-smokinlmm

<<<Future tuna killer
May 29, 2011
5,201
363
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At Da Beach
I've seen a couple funny buttons for fire systems and fuel shut offs. Best were "Hmm" for fuel shut off and "Oh Shit" for Halon system, both on the same Betram... Lol...

I just had a panel made for a Seavee that has Fish Whistle and Low Beer Alarm... Haha...
 

kidturbo

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Jul 21, 2010
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The exhaust is all water jacked so if you blow a fuel or oil line, there is no ignition heat source. Goal is no surfaces over 250F.

Now at this power level that's kinda hard to guarantee. We logged turbo cold side discharge at over 500F on the dyno. So ya do your best with what ya have.

The throttle blade as close to heads as possible is as Dave listed a Positive Air Shutoff. Most likely any non outside gas supplied runaway situation is gonna be fed by an oil feed line going to a turbo. So a guillotine or air knife setup won't work if you knock a hole in the pipes between and intake and turbo. Basically what happened to Mark when the charger wheel exploded. Got an oil/fuel supply, got air, she don't care a bit if ya cut the power or the lift pumps.

In a boat you have engines setting in a bathtub basically. So filling that area with Co2 or other inert gas displaces the oxygen. Besides fire suppression it will also kill a runaway. If ya notice in Mark's video, after he did that "graceful" exit, they spent another 30 seconds trying to kill that dragon. But it kept self feeding and reignited multiple times. These engines each have over 20qrts of oil and 300 gallons of fuel onboard. Ya get one shot to kill it quick, or may as well just jump overboard..

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kidturbo

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Jul 21, 2010
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The Dance Floor is coming together nicely...
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kidturbo

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Also picked up 10 gallons of engine oil today. Takes about 18quarts per engine.

Rural King had best deal if anyone is looking for full synthetic. $120 for 5 gallon vs $37 a gallon average everywhere else.
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kidturbo

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Jul 21, 2010
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Exhaust pipes welded up and dropped off to polisher. Fully jacked, but I left the water tubes off because it's easier for the polishing guy to work with no obstructions.

Soon as we get pipes back, both turbo to intake tubes fitted, then we can weld the V-Band rings on for good. Leaving a little wiggle room to spin the turbos if needed for mating up to throttle bodies.

Doesn't look like it, but add another 27lbs per engine.
 

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kidturbo

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Picked up the billet intake wedge plates yesterday. Little miscalculation on the center hole. Diameter is correct, but when you cut on a 25deg angle, it grows a bit..

Nothing a little welding won't fill. We thought about just putting the butterfly in the wedge, maybe next version.

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ironmax

chock full of goodies
Jul 7, 2010
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Col. Ohio
Jbweld ??
I hate those moments when all you can do is call your self a dumbazz. Always seems to happen when your in a hurry and got 20 billion other things going on.

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kidturbo

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If I would have caught it before he drilled the 4 countersunk holes, we could have flipped it around and been fine. Last time I saw, it was still square. But all good, welders gotta eat too. Mines been eatin really good lately. . :)

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kidturbo

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Ok brand new plan on the intake and PAS setup.

Needed a bit of wiggle room on the side to side and alignment angle between turbo and TB. Plus was getting a bit crowded with that monster V-band. So the TB got gutted, and blade is moving inside the wedge plate. And while a bit unconventional, 3" SS bellow to mate it altogether..

Now who can weld this SS to Aluminum for me??

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Last edited:

2004LB7

Well-known member
Dec 15, 2010
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I don't think you can directly weld aluminum to stainless without a severally compromised weld. Maybe you can braze it with aluminum brazing rods. But the most successful way is likely explosion welding.

Probably better off welding a flange to the bellows and bolting it the the TB
 

N2BRK

Well-known member
Dec 31, 2009
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Can't be welded. As soon as you touch it it'll break at the weld. But those low melt alloy rods can do it. I have messed with them a little and sometimes it's hard to get the even heat in both parts that you need. Good luck. I enjoy reading this thread!