under hatch pictures turbo setups
 

hey how about few pictures of your engine setup with turbos, especially if they are under the hatch
need some inspirations for BBC 502-560 ci
I'm caught up with practicality of going with Rajay E13 wheels with water jackets or actually wanting to run a larger twin turbo or single BW 80mm wheel
the engine is going under hatch so mindful of space, heat etc.
was thinking we could use some thermal insulation to reduce the heat around pipework, however need to get the heat out from under hatch

I have looked into using a marine diesel turbo just kicking ideas around. They are a bit pricey compared to the stuff people use on automotive but they are water-jacketed.

not much info on them like maps/ar, inducer, etc since most are oem for cat or cummins or whatever. Some clever math on the engines they are for could get u close

i think it could be done, just not in the plan for my current project

https://cimg7.ibsrv.net/gimg/www.off...84f6158d1c.jpg
https://cimg8.ibsrv.net/gimg/www.off...6de5fc7552.jpg
I have a twin turbo 377 Scarab with factory Mercruiser 475 HP turbos. They use a rRayjay EE trim turbo with water cooled heat shields. Gale Bank's and M&W are the only other manufacturers that make water cooled turbine housings. Look online for Carson Burmmett, He makes some twin turbo engines.
https://www.riverdavesplace.com/foru...merlin.144614/

I am also building a pair of twin turbo 454's with the M&W water cooled housings for my 30' Scarab.
This is what the turbos with the water cooled heat shields look like in my 377.

maybe thats the go to put the turbo close to the water cooled exhaust so your not having t deal with heat near the back of engine bay
I have some water cooled turbine housing here off the rotomaster setup and the stainless steel cooling jacket from gale banks rajay setup
I suppose I was trying to clarify whether the Rajay would NOT over spin due to increasing the size of the engine to 502-560 ci

Having looked at the gale banks water cooler exhaust riser they look small, and was thinking that if moved to larger water cooled exhaust like Imco powerflow whether this would be less restrictive, plus whether the rajay would be working more efficiency or spin to fast
The cross section area of the imco exhaust is 2x that of the gale banks exhaust at the top where the turbo T4 bolt pattern is.

Space wise its in favour of Rajay (A/R1.3) or newer BW-S300 turbos (A/R1.0)
manifold wise preference would be imco as they are larger and I have them
Whether to modify the 30 degree riser or adapt them to the centre mount position is realtive to location where you want the turbo
or whether there is other turbo options


https://cimg8.ibsrv.net/gimg/www.off...223b80f18f.jpg
imco powerflow plus manifold
https://cimg3.ibsrv.net/gimg/www.off...58dc82463c.jpg
https://cimg2.ibsrv.net/gimg/www.off...72c864e56a.jpg

I really want a twin turbo setup myself. You can have a hot side 3d printed in inconel with water jackets for any turbo you want. When I am ready I will weld jackets around tial hot sides. If you're not in to all that I would figure out what diesel turbo would work then get a turbo rebuilder to hybrid it with billet compressor wheel. the diesel stuff is just so heavy it will b very laggy.

Phughes69--I'm doing a Gentry twin turbo/twin engine boat. I bought the set but there was NO instructions or diagrams. Where are you getting your water for the intercoolers? Some have said they have a forced water pickup and they only get water while underway, others have tied them to their raw water pump. What's your setup and are you happy with it?

https://cimg3.ibsrv.net/gimg/www.off...8657c7c7e3.jpg
The under hatch look from my last boat, a 30' Checkmate.

check300
looks clean set up
are you running any waste gates on hot side?

I had some 12mm stainless adaptor place laser cut for the imco powerplus manifolds and have ordered 90 degree sch10 S/S elbows, I'll have a crack at fabricating the riser from exhaust manifolds to turbo, will use V-band clamp so can move turbo around to get in correct position. This will push the turbos approx. 8" back from there current on centre location,
Forgot had some aero race/imco /? double skinned water cooled pipes put away few years ago, so they would come off turbo, and get me close to inside of transom. At present from where turbo is mounted I have 1200mm (47") length to transom and pipes are 36" long
at least got the cooling issue covered
pic uploaded shortly

attached pics

was going to run the rajay 301 E13 turbo's as i have 2 brand new turbos here
Not sure whether I'll need the waste gates or not as turbo a reasonable small

https://cimg6.ibsrv.net/gimg/www.off...9ddcab67d0.jpg
https://cimg5.ibsrv.net/gimg/www.off...d2261f7eb8.jpg
https://cimg0.ibsrv.net/gimg/www.off...623468363b.jpg
https://cimg1.ibsrv.net/gimg/www.off...9e1c78ec6e.jpg

PHughes69
are you running any waste gates on turbine side, or any boost valve on inlet
what boost pressure do you see ?
Brett

Not sure why Patrick (phughes69) hasn't replied so I'll answer for him. He is running waste gates to control the boost pressure. You have 2 choices, waste gates or drilling a hole in exhaust housing to bleed some of the exhaust out. Without either your boost pressure will be excessive. I tried it and giving the throttles a half throttle blip jumped the pressure to 15psi so in fear of doing damage I never gave it more throttle until I installed the waste gates. The original Mercruiser/Banks 475 package using RayJay turbos controlled pressure with a 3/4" diameter hole in the exhaust housing which yielded about 4 or 5psi.
Andy

Andy
Thanks for the update
For the Rajay turbos that came with the Mercruiser/Banks 475 package, did they use the 1.0 A/R or 1.3 A/R turbine housings?
cheers
Brett

Brett,
I can't remember for sure (so long ago) but I believe they were 1.0. I believe the turbine A/R was marked inside the inlet. Patrick would have to look and confirm.
Andy

I ran 60 mm wastegates because my turbos were big and wanted to go to 50# of boost. I had adjustable boost with a key switch that allowed 12, 24 and 28 lbs of boost.

This is a project of a friend of mine
23' Caravelle with Vw/Audi twin turbo V6 with Arneson drive
Had it wet a couple of times, struggling with the computer and ABS/traction control delete issues
Should be fun when the bugs are worked out

https://cimg5.ibsrv.net/gimg/www.off...8547b3fc54.jpg

The water is coming from a pair of Mercruiser transom mount water inlets. I have two hoses connected to each inlet because the intercooler has two separate heat exchangers.

Like Andy said, the exhaust housings are 1.0 A/R. I spoke with a guy who was looking for the 1.3 A/R housings and the picture he sent me, the exhaust side was much wider. Aas far as boost goes. I adjusted the waste gates so I could get 15 psi of boost. It did not work well and I wrecked the center bearing in the turbo. I think at 15 psi the turbo is spinning too fast, which caused the bearing to fail. My next twin turbo setup, Im going to dial the turbos in for about 5psi of boost. When I build the turbo engines for my 377 Scarab, I'm going to put a speed pickup on the turbos so I know what they are actually spinning at.

Check300
what size turbos, and brand are you running on the 572"?
I had a look on another post and looks like the wastegates are vented to water cooler exhaust before it exists through transom, is this correct or are they vented to atmosphere through the hatch vent?
The key setup on dial a boost is nice setup

Phughes69
are your waste gates vented to atmosphere under hatch?

The waste gates do dump into the exhaust via a small pipe plumbed into the main exhaust. The turbos are 75mm. This combo made over 1700 hp at 25# of boost.

On my 377 Scarab the wastegates dump into the thru prop exhaust inlets on the TRS transom assembly. On my 30' Scarab I think I'm going to have the wastgates dump back into the exhaust just after the turbo. My only concern will be how the turbulence may affect the O2's

check300
are those borg warner 75mm turbos on T4 or T6 frames?
the boost gauge setup is neat with the key
which brand of electronic setup is this?
Brett

We used a t5 and they were Bullseye prepared Borg Warners. The ecu was BigStuff 3. Coil on plug.

The Gentry Setups run the waste gate in the turbo housing and dump it into the tail pipe.
https://cimg5.ibsrv.net/gimg/www.off...578d03b167.jpg
carb version
https://cimg9.ibsrv.net/gimg/www.off...5330cf354e.jpg
you can see the waste gate control on the side of the turbo housing silver cylinder.
https://cimg4.ibsrv.net/gimg/www.off...15bcd62fdc.jpg
EFI turbo system

nice setup
I need another 20 feet added to my turd to add some more HP
nice setup
but think I need external waste gates