Twins with Twins, Anyone?

DAVe3283

Heavy & Slow
Sep 3, 2009
3,726
296
83
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
5,195
360
83
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

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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..

Sent from my SAMSUNG-SM-G890A using Tapatalk
 

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
The Dance Floor is coming together nicely...
d1bee706ebaddf294b03ce0187764550.jpg


Sent from my SAMSUNG-SM-G890A using Tapatalk
 

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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.
8279791295b9749d3b9314c6c02e84dd.jpg


Sent from my SAMSUNG-SM-G890A using Tapatalk
 

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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.
 

Attachments

  • 20190519_064853.jpg
    20190519_064853.jpg
    107.4 KB · Views: 79
  • 20190520_084112_001.jpg
    20190520_084112_001.jpg
    102.5 KB · Views: 76
  • 20190520_084416.jpg
    20190520_084416.jpg
    80.5 KB · Views: 79

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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.

48a22c6e3dafee84a91b53efafc607db.jpg
fddf331e808f0b0c5eb6d811d533cb38.jpg
69b3f145212e8d0007be308116d53c97.jpg
d4b50b7f02cb2bfb79cb5c1eb952cc94.jpg
c757a82f8ed75a7d5d5241244cef8174.jpg


Sent from my SAMSUNG-SM-G890A using Tapatalk
 

ironmax

chock full of goodies
Jul 7, 2010
502
27
28
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.

Sent from my SM-J337A using Tapatalk
 

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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. . :)

Sent from my SAMSUNG-SM-G890A using Tapatalk
 

kidturbo

Piston Tester
Jul 21, 2010
2,532
1,358
113
Somewhere On The Ohio
www.marinemods.us
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??

22ec05af07d532cc3ad57a7e033a34a0.jpg
006704fe6d3557e2e545e797cc206b4c.jpg
5ce6ccb34f37a7c887761206d4df73f8.jpg
e1531e049fe0b904dd464faf0821a101.jpg


Sent from my SAMSUNG-SM-G890A using Tapatalk
 
Last edited:

2004LB7

Well-known member
Dec 15, 2010
6,955
2,135
113
Norcal
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
2,054
371
83
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!