finiata

iTrader: (7)

You bring up a good question, how do you turbo a setup that's flowing water through the exhaust? Being heat will be an issue I'm thinking about using the procharger and a water to air intercooler. Don't think I want all the turbo heat in mine. Thinking about putting ac on it too for the cabin

garys 68

iTrader: (1)

Mercs new hi performance motors are turbocharged. Years ago there were a few carbed turbo big blocks available too, they had reliability issues though.
They use a water cooled dry manifold and water cooled turbos. It's a stainless housing welded around the turbo hot side, you can find these on ebay sometimes.
As for cams, marine and turbo cams have some things in common. Wide LSA to prevent reversion with marine and prevent the boost from blowing through with a turbo. I'm not much of an expert with turbos, but for a 5.3 I would think an LS1 or LS6 cam would be a economical solution.

Chris1530

Well the way it works is the manifold is a closed unit, then there is a riser
a water line runs from the manifolds to the riser and water flows out the riserinto the exhaust
The way i have it planned is to take away the riser, and make new non cooled risers (leaving the water jacketed manifolds) that would merge into the turbo flange,.. Then from the turbo, i might just run a pipe over transom, or split it back into two and exit through transom, if i do the later i would want to re add water down stream after the turbo
So the cooled manifold would lower exhaust temps, but i wouldnt have water flowing through the turbo.
At least thats my plan.
lol

So you think i would be good with just a LS6 cam,
can those springs handle somthing like this
or would either of these be better over the ls6 or would the ls6
do better ?

Duration at 050 inch Lift 224 int./228 exh.
Advertised Duration 273 int./278 exh.
Valve Lift with Factory Rocker Arm Ratio 0.591 int./0.600 exh.
Lobe Separation (degrees) 113

or

Duration at 050 inch Lift 226 int./232 exh.
Advertised Duration 281 int./284 exh.
Valve Lift with Factory Rocker Arm Ratio 0.578 int./0.587 exh.
Lobe Separation (degrees) 115

THanks

Chris1530

Also looking at this Cam kinda Close to the LS6 cam with some differences
Duration at 050 inch Lift 216 int./220 exh.
Advertised Duration 283 int./286 exh.
Valve Lift with Factory Rocker Arm Ratio 0.560 int./0.560 exh.
Lobe Separation (degrees) 114

Chris1530

Bump Any advice

Chris1530

nothing...

gordyd4

Anymore picture of exhaust manifolds?

ss454327

iTrader: (10)

Why not run a procharger? Better all around power than a maggie and without all the hassle of the turbo (since it's a marine application).

Aubtiger77

I have a complete Ls1 minus ECM an wiring. Wanting to put in my scarab jet boat. I found exhaust manifolds I think will work ( read that coils might be in way )
Just about everyone tells me to just do the edelbrock carb conversion and be done with it. I would like to get a aftermarket or used ECM an wires if possible. Nobody local knows how to program this setup for marine
QUESTION:
1) Is it feasible to go ECM route? If so what are my parts and how much?
2) What are steps to take?
3) Is there anyone that will flash / / sell comp for me and make a simple harness. I am using wet exhaust so I don't think I will have O2's ( is this right?)
4) what cam would be good for this marine setup?
5) what fuel pump? Got existing that came off my old vortec setup. Will this work?

85mcss

iTrader: (2)

Pump gas JY 98 LS1 with an ON3 76mm & Megasquirt 3. Runs 88 on GPS at 5000 RPM with 12#. Pump setup needs some work to get some more RPM but it does good for what it is.

cabinlife83

garys 68

iTrader: (1)

Not sure if anyone in the US is making a log manifold for LS motors, but could be this:
https://www.tawcomarineproducts.com.au/ls1-manifolds/
Alternatively, Ford 351 Cleveland marine log manifolds are adaptable to LS heads.

Lsjetboat

guys Im trying to figure out the water plumbing on an LS 5.3 engine that Im swapping into the Jet boat. Anybody have any detailed pictures of your raw sea water cooling system with wet headers?

ezstriper

wrong..several impellers available

G Atsma

You responded to an 11-year old post....