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View Full Version : motor swap- will it work? 2004 X2


ranger098
05-16-2012, 12:09 PM
first post, and i have to thank you all for all the help you have given me so far- one question i cannot find an answer to though....

i need to know if a MPI engine can be put into my boat that currently has a TBI engine? it is for an 04 mastercraft x2 with a 350 indmar in it. from what i can tell everything will work except the wiring harness, that is what me and my mechanic do not know, and i do not want to buy a new harness (bill is getting purty darn big already!)

any advice would be greatly appreciated

j.mccreight@hotmail.com
05-16-2012, 01:43 PM
Physical it will bolt up and work that way, but the harness and ecm and possible engine sensors will need to be replaced for it to work.

thatsmrmastercraft
05-16-2012, 02:29 PM
Sounds like you would be opening a huge can of worms with this one.

ahhudgins
05-16-2012, 02:52 PM
Sounds like you would be opening a huge can of worms with this one.

I agree, and it usually ends up getting pretty expensive buying the parts to get it all running.

Might be a LOT cheaper to stay with what you have. May I ask why you want the swap?

ranger098
05-16-2012, 02:55 PM
thanks alot- thats what i thought- i will keep looking for an engine. if anyone knows of a complete vortec 350 engine minus exhaust manifolds, let me know! i know i can get one online but they want alot of money (8k dollars) and dont need a brand new one.

i got the boat with salt water damage to the engine. it can be rebuilt, but i also need important parts like the ECM, intake manifold, starter (all parts are rusted beyond repair) and alternator so i figured i could buy a new motor for a similar price.

95_190_PS_PS
05-16-2012, 05:59 PM
For a complete used engine, you can check out ebay or junkyards. Advanceautoparts.com, sells re-manufactured engines that include the heads, and it looks like it would be $1700 for the engine from them. That would still leave you needing the ECM, intake manifold starter and alternator. It would also be a good idea to swap out all the freeze plugs with brass ones before installing a new engine if it doesn't already have brass plugs. I bought my boat with engine problems too, had to swap the LT1 out due to water leaking into the oil from the #2 cylinder, but I was able to reuse anything I wanted to aside from the old block.

http://motors.shop.ebay.com/Complete-Engines-/33615/i.html?_nkw=vortec+5.7&_catref=1&_dmpt=Motors_Car_Truck_Parts_Accessories&_fln=1&_trksid=p4506.c0.m282

j.mccreight@hotmail.com
05-16-2012, 07:22 PM
You could always go with an aftermarket fuel injection system that would have the harness and ecm everything for plug and play, holley, edelbrock etc. but you would need to research if its coast guard compliant.

95_190_PS_PS
05-16-2012, 08:11 PM
You could always go with an aftermarket fuel injection system that would have the harness and ecm everything for plug and play, holley, edelbrock etc. but you would need to research if its coast guard compliant.

Do those aftermarket systems run closed loop, or is there a way to make them run closed loop? I have a very "general" understanding of how this stuff works, do the aftermarket systems eliminate the need for O2 sensors and all that stuff, or will a MAF or MAP sensor need to be added as well as O2 sensors. I assume that the old engine would have used at least a MAF or MAP sensor, which would probably be interchangeable between systems, but if O2 sensors are required, you'd have to drill into the risers or somewhere.

Please educate me on this :confused: I know pretty much nothing about aftermarket systems.

JimN
05-16-2012, 08:20 PM
first post, and i have to thank you all for all the help you have given me so far- one question i cannot find an answer to though....

i need to know if a MPI engine can be put into my boat that currently has a TBI engine? it is for an 04 mastercraft x2 with a 350 indmar in it. from what i can tell everything will work except the wiring harness, that is what me and my mechanic do not know, and i do not want to buy a new harness (bill is getting purty darn big already!)

any advice would be greatly appreciated

The harness will definitely need to be replaced and the ECM will need to be reprogrammed, at best. If the MPI engine was from a marine application, you may be able to use the ECM but it won't be a match to the boat, like the MC programming. If you know someone who can do data acquisition and programming, that may work but to do a custom program right, you would need to know exhaust temperatures, emissions and load.

j.mccreight@hotmail.com
05-16-2012, 10:36 PM
Do those aftermarket systems run closed loop, or is there a way to make them run closed loop? I have a very "general" understanding of how this stuff works, do the aftermarket systems eliminate the need for O2 sensors and all that stuff, or will a MAF or MAP sensor need to be added as well as O2 sensors. I assume that the old engine would have used at least a MAF or MAP sensor, which would probably be interchangeable between systems, but if O2 sensors are required, you'd have to drill into the risers or somewhere.

Please educate me on this :confused: I know pretty much nothing about aftermarket systems.


It all depends on the system you want to run, the holley pro-injection system uses a tbi intake sold separately, but otherwise is complete and can be run in closed loop with an o2 sensor installed in a dry part of exhaust manifold or in open loop no o2 used, it is basically a speed density system using pre programmed parameters. In closed loop it adjusts mush easier, there in no maf or map, the ecm is adjustable 5 ways with screws on it. this system is good for a low hp engine around 275 hp and very basic but its only around 1k, there are a bunch of other kits and mfgs just depends on your budget. This kit is coast guard approved. Btw I don't work for holley. I recently used a similar kit on a v6 to v8 swap on an older chevy truck.

j.mccreight@hotmail.com
05-16-2012, 11:22 PM
thanks alot- thats what i thought- i will keep looking for an engine. if anyone knows of a complete vortec 350 engine minus exhaust manifolds, let me know! i know i can get one online but they want alot of money (8k dollars) and dont need a brand new one.

i got the boat with salt water damage to the engine. it can be rebuilt, but i also need important parts like the ECM, intake manifold, starter (all parts are rusted beyond repair) and alternator so i figured i could buy a new motor for a similar price.

Salt damage in the midwest? The boat must be the x2 that was for sale out of new york awhile back. Is this the boat... http://www.mastercraft.com/teamtalk/showthread.php?t=46958

ranger098
05-17-2012, 11:42 AM
yessir thats the boat... your good. i swear this is the boat heard around the country. when i pull it down the road people pull up next to me and ask me about it. people call from all over the country. little do they know, the motor is damn far from a rebuild as stated in the ad. she needs to be swapped.

anyone that has a near complete 350 vortec tbi for sale let me know!

93ProStar205
05-17-2012, 12:00 PM
Saltwater damage=boat sank (or partially sank) and/or hydro locked with saltwater?

ranger098
05-17-2012, 12:08 PM
nope never sank... i think it maybe hydrolocked but the guy says it didn't....

02ProstarSammyD
05-17-2012, 12:19 PM
first post, and i have to thank you all for all the help you have given me so far- one question i cannot find an answer to though....

i need to know if a MPI engine can be put into my boat that currently has a TBI engine? it is for an 04 mastercraft x2 with a 350 indmar in it. from what i can tell everything will work except the wiring harness, that is what me and my mechanic do not know, and i do not want to buy a new harness (bill is getting purty darn big already!)

any advice would be greatly appreciated


Have a merc mag mpi in my x9. Anything can be done for $$$

JimN
05-17-2012, 04:51 PM
nope never sank... i think it maybe hydrolocked but the guy says it didn't....

That's easy enough to check. If the motor is intact, but bad internally, why not buy a short block and a new OEM intake manifold (it came with a good manifold- an aftermarket won't be better, really) and swap everything? That way, you don't have to question whether the ECM needs to be re-programmed, the motor is correct for the model of boat, etc? That kind of swap os pretty easy. It would be cheaper, too.

CantRepeat
05-17-2012, 05:16 PM
That's easy enough to check. If the motor is intact, but bad internally, why not buy a short block and a new OEM intake manifold (it came with a good manifold- an aftermarket won't be better, really) and swap everything? That way, you don't have to question whether the ECM needs to be re-programmed, the motor is correct for the model of boat, etc? That kind of swap os pretty easy. It would be cheaper, too.

And to go along with Jim's line of thought...

You'd probably be better of with a short block or just a rebuild rather then swapping in a different motor, harness and ECM unless you repower it with something MC put in that boat in the first place. But I can't see a need to repower it.

ahhudgins
05-17-2012, 06:45 PM
And to go along with Jim's line of thought...

You'd probably be better of with a short block or just a rebuild rather then swapping in a different motor, harness and ECM unless you repower it with something MC put in that boat in the first place. But I can't see a need to repower it.

Seems like the easiest, quickest, and cheapest thing to do.

ranger098
05-18-2012, 02:33 PM
taking the engine to wagoman brothers to see about rebuilding or getting me a long block to build and then i can put her together and drop it in. if i do i will be taking pics along the way and uploading them- could make for a nice writeup. thanks again to all who responded... ill keep you posted on what happens.

46Chief
12-23-2012, 09:14 PM
Curious how you came out on this project, did the boat and underwater gear clean up very easy from the saltwater?

ranger098
01-21-2013, 02:34 AM
sorry for the late reply, dont get on here much in wintertime!

i ended up getting the engine rebuilt, and she runs great now! new intake mainifold, exhaust manifolds, ecu etc in addition to a full engine rebuild done at a shop. while the engine and tranny were out i cleaned the hull inside and out and she cleaned up nice. the boats got antifoulant paint so there was no gelcoat to worry about, and the propshaft had no corrosion. still working out some little kinks in the boat, but i had some good time on the water this year and thats what its all about!

thatsmrmastercraft
01-21-2013, 12:40 PM
Good to hear you got things worked out and got back on the water.