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  1. vroom ZOOM

    350 mpi rebuild questions

    Well, I still havent got the block from the machine shop yet, but I am trying to figure out the closed cooling situation. Does anyone know the difference between the closed and open cooling version of the ECM? Any harm if I throw a RWC ECM on a FWC motor?
  2. vroom ZOOM

    350 mpi rebuild questions

    Well at this point someone mentioned that a steel shim gasket will leak and I then said to hell with the quench. To make matters worse, most marine head gaskets are 0.039. I went ahead and got flattop pistons 1.548 high and that gives my 9.4 compression with a marine head gasket. If it ends up...
  3. vroom ZOOM

    Wake boat fuel supply issues

    After some googling I figured out what the big fitting is, apparently its a tank vent valve (TVV). Also found this little diagram online and the setup I am dealing with might be sort of similar with the addition of two more vent lines and a return line from the engine. I think the two...
  4. vroom ZOOM

    Wake boat fuel supply issues

    Hi everyone This thing is driving me nuts. its a 2015 gekko revo. The pump is sucking air in somewhere. I put a clear chunk of line from the tank pickup with a gauge and it pulled about 5 inches of vacuum and it looked like a bunch of air was coming in as well. I unscrewed the pickup from the...
  5. vroom ZOOM

    350 mpi rebuild questions

    0.051-0.053
  6. vroom ZOOM

    350 mpi rebuild questions

    I wish I could... That is what I am trying to do. The thing is I am having a hard time finding pistons that replicate the stock ones. Either they are too short, the dish is too big or too small or they cost an arm and a leg.
  7. vroom ZOOM

    350 mpi rebuild questions

    The piston situation is driving me nuts... Basically I have three options, neither of which I like but I have to pick one. Both set the compression to 9.4-9.5 Option 1 is to run a dished 1.55 compression height speed pro H815DCP. I like this option because I get 50 thou quench with this setup...
  8. vroom ZOOM

    350 mpi rebuild questions

    Well the project is moving along. Not as fast as I want it to, but nonetheless moving along. After finally getting two good cores (was not easy) I am transitioning to the building stage. First issue I had with figuring out what connecting rods to use has been finally solved, I want the one on...
  9. vroom ZOOM

    350 mpi rebuild questions

    Thanks for the info. Regarding building the 6.2, it seems like the cams are different? I found three different part numbers for sbc cams: 811658 (I think I have these, used on 5.0 and 350) 866022T (Used only on 350) 862562T1 (Used only on 6.2) Does anyone know the difference in these cams...
  10. vroom ZOOM

    350 mpi rebuild questions

    Hello, I was posting regarding my 5.0 saltwater motors, and it seems like rebuild time arrived too fast. One of my motors on my new to me boat is stuck solid. Time to build new ones! Since the old motors are saltwater 5.0 mpi's, I think I will use them for parts and junk the blocks. I will...
  11. vroom ZOOM

    saltwater 5.0 weak points

    I apprecieate the insight from everyone, I think I will put a new intake and exhaust on my current 5.0 engines (Just checked yesterday and they turn freely, hooray!). Over the winter I might grab some wrecking yard blocks and build myself two 6.2 engines and sell the 5.0 ones to recoup some of...
  12. vroom ZOOM

    saltwater 5.0 weak points

    I see new heads all over fb marketplace for peanuts, if I go to build a 5.7 or 6.2 I will grab a rust free wrecking yard motor to start off with, and for the $500 it will already have the correct heads.
  13. vroom ZOOM

    saltwater 5.0 weak points

    This is what I was really thinking hard about. Should I budget to bore the wrecking yard motor, or is a hone, line hone and re ring usually good? Do I need a forged or just plain cast stroker crank? I guess I will have to buy the mercruiser cam and lifters though so I don't run into trouble with...
  14. vroom ZOOM

    saltwater 5.0 weak points

    Thank you for the info, I am not really limited money wise, more time wise. I think I will slap a new intake and exhaust on the existing motors and build some new ones over the winter.
  15. vroom ZOOM

    saltwater 5.0 weak points

    Luckily, they didnt, and will be replaced before starting the engine up again I would then need to reflash the ecm to update it to 350 spec. Sorry, this aint carb stuff. At that point I may as well build two 6.2s. Also I think the 305 heads wont fit a 350 short block? I do like the closed...
  16. vroom ZOOM

    saltwater 5.0 weak points

    Hello, just picked up another project boat but this one has seen saltwater for 15 years (I think), and then sat for 5 more, it has twin 2005 5.0 MPI engines with dry joint exhaust. My concern is that these are open loop motors. What rots out on these engines first? I will be replacing the...
  17. vroom ZOOM

    I/O (Sterndrive) Conversion to Outboards

    Just wanted to jump in here and say that you will probably loose axius. Merc dealers are often very reluctant to install joystick piloting on repowers, its mostly on new boats. Besides, if your outboards aren't going to be installed exactly the same as in the factory version, you will need a new...
  18. vroom ZOOM

    Anyone try this scan tool?

    already have rinda.
  19. vroom ZOOM

    Anyone try this scan tool?

    Oh, I have diacom for some time now, I was looking for something to extend my capabilities. Diacom is good for diagnostics, thats it. When I swap out an ecm on a 40 foot boat in my yard, I don't want to have to pay to have a 40 foot boat taken to the dealer just to set an engine configuration...
  20. vroom ZOOM

    Anyone try this scan tool?

    Was digging on the internet to try find a copy of G3 (no dice :mad:) when I ran into this thing: https://www.obdstarstore.com/wholesale/obdstar-iscan-mercury-marine-diagnostic-tool.html I am curious if anyone has actually tried it and if it actually does all the stuff that it advertises. If not...
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