Sam1647545489 Posted September 6, 2010 Report Share Posted September 6, 2010 Welp, the 350 motor in my boat let go the other day. I pulled it out today and tore it apart. Camshaft came out in 2 piece, and a few rods are fuzzed to the crank. So now its time for a new motor. I have a few questions first. I am goin to do a 6L ls style motor in my boat. I wanna know do normal boat motors have an external water pump to pump the water to the water pump on the motor? Like the lower unit pump???? Secondly, does the water that flows through the exhaust go actually in the exhaust or chambers surrounding the exhaust. Basically I gotta take some stock 6L manifold, turn the upside down and switch sides. I wanna run water through them somehow and keep the water out of the motor. Also what kind of cam selection do I need to look for? Any help is appreciated. Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 6, 2010 Report Share Posted September 6, 2010 Where are all the pictures from today? Quote Link to comment Share on other sites More sharing options...
MaTS1200 Posted September 6, 2010 Report Share Posted September 6, 2010 Welp, the 350 motor in my boat let go the other day. I pulled it out today and tore it apart. Camshaft came out in 2 piece, and a few rods are fuzzed to the crank. So now its time for a new motor. I have a few questions first. I am goin to do a 6L ls style motor in my boat. I wanna know do normal boat motors have an external water pump to pump the water to the water pump on the motor? Like the lower unit pump???? Secondly, does the water that flows through the exhaust go actually in the exhaust or chambers surrounding the exhaust. Basically I gotta take some stock 6L manifold, turn the upside down and switch sides. I wanna run water through them somehow and keep the water out of the motor. Also what kind of cam selection do I need to look for? Any help is appreciated. If you have an Alpha drive the raw water pump is in the lower unit and it sends water to the water pump. You'll need to use marine specific exhaust manifolds. They are water jacketed and introduce water into the exhaust gases about halfway down the exhaust riser. Not sure about the cam. Quote Link to comment Share on other sites More sharing options...
Sam1647545489 Posted September 6, 2010 Author Report Share Posted September 6, 2010 Here is the first thing I see when I pulled the motor. http://i161.photobucket.com/albums/t214/ls2sam/IMG00052-20100906-1406.jpg Some carnage http://i161.photobucket.com/albums/t214/ls2sam/IMG00054-20100906-1935.jpg Part of camshaft missing http://i161.photobucket.com/albums/t214/ls2sam/IMG00055-20100906-1935.jpg There it is http://i161.photobucket.com/albums/t214/ls2sam/IMG00056-20100906-1935.jpg Quote Link to comment Share on other sites More sharing options...
Sam1647545489 Posted September 6, 2010 Author Report Share Posted September 6, 2010 Matt, what do you mean, do they just go around the manifolds then? I am trying to figure out how these work http://www.boatheaders.com/images/std%20merc%20header.JPG Quote Link to comment Share on other sites More sharing options...
MaTS1200 Posted September 7, 2010 Report Share Posted September 7, 2010 (edited) Matt, what do you mean, do they just go around the manifolds then? I am trying to figure out how these work http://www.boatheaders.com/images/std%20merc%20header.JPG Yes. The holes at the bottom introduce water around the exhaust, (there is an inner pipe where the exhaust gasses travel without water) and it mixes with the exhaust gases where they meet at the top. Hope that makes sense. Here's an old thread on OSO. It might be a good place to get some info on a conversion. http://www.offshoreonly.com/forums/general-q/188814-ls-vs-350mag-weight-savings.html Edited September 7, 2010 by Matt Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 7, 2010 Report Share Posted September 7, 2010 Matt, Is the inner and outer pipe used for cooling the exhaust inside the boat? Sam and I talked about taking F-Body headers flipping them upside down and running water in the O2 sensor bung to cooler the exhaust when it comes out of the back of the boat. Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 7, 2010 Report Share Posted September 7, 2010 Found a set of these that people are using on LSX motors. These are Ford manifolds. http://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs493.ash1/26926_561640870097_6605880_32719453_1727581_n.jpg http://sphotos.ak.fbcdn.net/hphotos-ak-snc3/hs513.snc3/26926_561640880077_6605880_32719455_3702592_n.jpg Quote Link to comment Share on other sites More sharing options...
MaTS1200 Posted September 7, 2010 Report Share Posted September 7, 2010 Matt, Is the inner and outer pipe used for cooling the exhaust inside the boat? Sam and I talked about taking F-Body headers flipping them upside down and running water in the O2 sensor bung to cooler the exhaust when it comes out of the back of the boat. Yes. The water jackets around the headers keeps the temps low inside the boat. There's not enough airflow back there to keep things cool enough if you run unjacketed headers. Theoretically you could run straight headers and cool them downstream to keep the transom cool but you would probably need to lose the rear sundeck/hatch to keep temps down. Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 7, 2010 Report Share Posted September 7, 2010 I found this on LS1 tech Thanks Cool. More pics and progress! Some drilling to make the ford manifolds work. http://sphotos.ak.fbcdn.net/hphotos-ak-sjc1/hs542.snc3/29712_562513142057_6605880_32742688_1131158_n.jpg Got the logs bolted on. http://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs502.ash1/29712_562513137067_6605880_32742687_4233269_n.jpg http://sphotos.ak.fbcdn.net/hphotos-ak-snc3/hs522.snc3/29712_562513147047_6605880_32742689_7260442_n.jpg Dropping it in: http://sphotos.ak.fbcdn.net/hphotos-ak-sjc1/hs522.snc3/29712_562513152037_6605880_32742690_3851990_n.jpg Ohhhhhhhhh yeah! http://hphotos-sjc1.fbcdn.net/hs522.snc3/29712_562513157027_6605880_32742691_7321774_n.jpg http://hphotos-snc3.fbcdn.net/hs542.snc3/29712_562513641057_6605880_32742693_8115303_n.jpg http://hphotos-sjc1.fbcdn.net/hs522.snc3/29712_562513651037_6605880_32742694_5048922_n.jpg http://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs502.ash1/29712_562513661017_6605880_32742695_510594_n.jpg Just have some plumbing and wiring to do before she's ready to fire!! Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 7, 2010 Report Share Posted September 7, 2010 Sam, Check this thread out. http://www.ls1tech.com/forums/conversions-hybrids/934792-lsx-into-jet-boat-9.html http://www.ls1tech.com/forums/conversions-hybrids/934792-lsx-into-jet-boat-6.html Quote Link to comment Share on other sites More sharing options...
Rhett Posted September 7, 2010 Report Share Posted September 7, 2010 Linn... I know some video from a certain night is up Quote Link to comment Share on other sites More sharing options...
John Bruh Posted September 7, 2010 Report Share Posted September 7, 2010 Why not just do a 8.1? I know a lot of boat companies run these Quote Link to comment Share on other sites More sharing options...
Sam1647545489 Posted September 8, 2010 Author Report Share Posted September 8, 2010 Well, I ended up picking up another 350. Its a brand new rebuild with a 30 over bore. Stock heads with a valve job and a hair bigger then stock cam. I went this route to make reinstalling back into the boat easier and everything will bolt right back on from the old motor. The motor should rev alil higher then the older one and makes a few more ponies. I am guessing around 330 or so. I should have it runnin by this weekend as I have the motor and already all assembled and ready to drop back in the boat. I hope everything goes ok. Quote Link to comment Share on other sites More sharing options...
Sam1647545489 Posted September 10, 2010 Author Report Share Posted September 10, 2010 Boat is goin to be fired up for the first time tonight. I hope everything goes good. I am nervous like always when starting up a new motor but I am confident it should work out fine. Quote Link to comment Share on other sites More sharing options...
FormulaMatt Posted September 10, 2010 Report Share Posted September 10, 2010 Very nice. Did you do bolt ons or anything? It has felt great having mine out finally. Unfortunately, it was short lived. I popped my drive I'm pretty sure. Oh well, back to the cuddy for the rest of the year. When will you be out at Alum next? Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted September 10, 2010 Report Share Posted September 10, 2010 Very nice. Did you do bolt ons or anything? It has felt great having mine out finally. Unfortunately, it was short lived. I popped my drive I'm pretty sure. Oh well, back to the cuddy for the rest of the year. When will you be out at Alum next? 750 DOUBLE PUMPER!!!!! Quote Link to comment Share on other sites More sharing options...
flat tire Posted September 10, 2010 Report Share Posted September 10, 2010 750 DOUBLE PUMPER!!!!!Hot Damn that thing should fly with double dual twice pipes and a double pumper Quote Link to comment Share on other sites More sharing options...
SRTurbo04 Posted September 10, 2010 Report Share Posted September 10, 2010 Very nice. Did you do bolt ons or anything? It has felt great having mine out finally. Unfortunately, it was short lived. I popped my drive I'm pretty sure. Oh well, back to the cuddy for the rest of the year. When will you be out at Alum next? dam that sucks! you didtn get to enjoy much of it but atleast u have... other boats the play with jet ski goes in to get fixed next thursday ...so mabey i can play a few times before its too cold. 750 DOUBLE PUMPER!!!!! hahah Quote Link to comment Share on other sites More sharing options...
Sam1647545489 Posted September 11, 2010 Author Report Share Posted September 11, 2010 Well, a 2 min fuck up costed me not being able to fire it up tonight. Got it fixed though and gonna fire it up tomorrow. I am getting good at pulling the motor, I had it out and problem fixed in well under 2 hours. Tomorrow if all goes well which it should then I will prolly be out on the water either sunday or all next weekend. Quote Link to comment Share on other sites More sharing options...
Wheezle Posted September 11, 2010 Report Share Posted September 11, 2010 .. Quote Link to comment Share on other sites More sharing options...
SRTurbo04 Posted September 11, 2010 Report Share Posted September 11, 2010 u gonna end up building a fun motor over winter or? Quote Link to comment Share on other sites More sharing options...
Bahnstoermer1647545488 Posted September 11, 2010 Report Share Posted September 11, 2010 Damn dude, sorry to hear about the trouble. The end of the boating season is working you over! I'm sure you'll not go slower as a result of the rebuild though Quote Link to comment Share on other sites More sharing options...
KillJoy Posted September 11, 2010 Report Share Posted September 11, 2010 Can you run a boat motor out of the water? KillJoy Quote Link to comment Share on other sites More sharing options...
wnaplay1647545503 Posted September 11, 2010 Report Share Posted September 11, 2010 Can you run a boat motor out of the water? KillJoy You hook up whats called earmuffs to the outdrive and then to a water hose. Then you can start it as the hose will provide the necessary cooling and lubrication. Quote Link to comment Share on other sites More sharing options...
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