Turbo a inboard boat.
03-09-2017, 10:03 AM
#1
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Turbo a inboard boat.
Hi all. I am new to this site and look forward to chatting with all of you. As it says in the description I am going to be turboing my boat.
Motor so far.
496 cid merc
4340 forged crank
4340 forged H beam rods
L19 ARP rod bolts
Forged 8.5-1 pistons
Procomp aluminum heads
Custom ground hydraulic roller cam
Stock intake
Twin t4 71 mill turbos
Water intercooler.
Going in a 24 foot power quest.
Going to make a custom water cooled turbo shield as well.
Should be a fun time on the water. Has anyone else tried this here?
Motor so far.
496 cid merc
4340 forged crank
4340 forged H beam rods
L19 ARP rod bolts
Forged 8.5-1 pistons
Procomp aluminum heads
Custom ground hydraulic roller cam
Stock intake
Twin t4 71 mill turbos
Water intercooler.
Going in a 24 foot power quest.
Going to make a custom water cooled turbo shield as well.
Should be a fun time on the water. Has anyone else tried this here?
03-09-2017, 10:10 AM
#2
Were doomed!
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Not sure about that exact setup...but turbos and boats are nothing new...mercruiser played with them back in the 80's but i think the tech was just not up to par to make it reliable like the computers can do now a days 
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-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
03-09-2017, 10:20 AM
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I have played with turbos on cars. Not to hard to do lol. But it is the heat that gets you on a boat! I had it out last year with a stock motor with the hatch up. But need to revamp things so I can close the hatch! I think I have this problem solved by doing a few things differently. But wow! What a difference. Went from it hard to plan with a 24 pitch to planing in 10 feet with a 28 pitch lol. That was at 4.5 lb boost on stock heads cam and all lol. This summer will be epic!
03-09-2017, 10:23 AM
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Few people on the site have done it. I know atleast one put a #6 drive on his boat. Believe it was the checkmate.
03-09-2017, 11:17 AM
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Check300 had two of them.
The engine is a bow tie tall deck gen IV. I actually had the same motor in a different twin turbo configuration in a 1997 253 Convincor. It was making about 1200 hp but it was impossible to keep a drive together so I decided to go up to a 300 (Checkmate)and rig it with a #6. The engine is now making over 1500hp. I use a Bam 1500 dry sump tranny and the drive is a 1:24 ratio. We're still doing prop testing and think that the boat will be in the area of 115-120. I have seen a best of 114 but that was before upping the power to the current levels. We use Big Stuff3 engine management and also control boost with the ecu.
03-12-2017, 03:47 PM
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Acouple things are best in a boat using a water cooled turbine housing or a water cooled cover around the housing. Another issue is having heads and an intake with an exhaust crossover to keep the turbos at the same speed or you get possibility of more boost on one bank than the other. Higher boost needs lower compression which need for a 2 speed tranny to get on plane becomes necessary.
There was a guy in here I think with an Apache twin hull putting out 2000 HP per engine had to build his own 2 speed trannys he would sell for about 10K each.
There was a guy in here I think with an Apache twin hull putting out 2000 HP per engine had to build his own 2 speed trannys he would sell for about 10K each.
03-14-2017, 01:11 PM
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The motor is 8.5 to 1 compression. Should spool up just fine. The stock motor would plane in about 20 feet from a slow roll I guess you would say. It is a efi motor so only one inlet to the intake so one bank making more boost is not possible. I am going to build a water cooler to go around the turbos.
03-14-2017, 02:34 PM
#8
Were doomed!
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Sounds interesting....definitely keep us posted on this project 
By the way...are you tuning your own motors? What program are you using? HP Tuners or something else? Im just starting to play in this and want to learn.
By the way...are you tuning your own motors? What program are you using? HP Tuners or something else? Im just starting to play in this and want to learn.
__________________
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
03-14-2017, 03:54 PM
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Its got more to do with balancing the exhaust with out a crossover in the heads. one should build an external crossover connected to the exhaust manifolds before going in the turbine. This is easy on a car rather difficult on a boat as it should be water jacketed. Even carb setups have a single entry weather its single or dual entry into a box enclosure or a bonnet.
Its the reason i am selling my SBC IK Brodix heads purchased them not knowing they didnt have cross overs.
Its the reason i am selling my SBC IK Brodix heads purchased them not knowing they didnt have cross overs.
