Exhaust is the same, intakes are different.
Also, the rockers are different also, just one more thing to deal with, but if you are swapping the entire engine, it a non issue. The fuel pump might be though, the "new" engine will probably need an electric fuel pump and the additional wiring/switches for safe control.
Starter, alternator, ignition, fuel pump, plumbing etc. MUST be USCG approved for marine use. As for the injection system, who knows. The USCG regs(available online) cover everything, including test procedures, except fuel injection. They only detail carberated gas engines. I have asked the question here(in another forum) - what, if anything, makes a fuel injection system "MARINE"? There has been no answer. I have also requested "all relevant regulations" concerning the installation of a fuel injected gasoline engine in a boat. So far, no response.
180shabah, did you put a fuel injected engine in you boat, or where you just asking in the other post?? I dont know if I even wanna mess with it. there is a lot of wireing involved.. it might be better just to drop a carb. engine in it?? You might be able too get better gas (millage) out of the injection?? But you can tune the crap out of it when you want I guess?
I have not done an EFI install on anything yet, but we are looking to build a "small" cruiser. We haven't chosen a design yet so engine choice is still irrelevent. If it ends up being gas powered, I want EFI this time around, and now that it's simple to put O2 sensors in the exhaust an older TBI setup be a decent choice. Very reliable, highly tunable for little money and peole practically give them away cause in GM cars and trucks they made little power. I do see any risk using and automotive TBI unit(with the marine distributer and fuel system), but risk and legality are two different issues.
well. as far as the vortec. Im not lookin to put the TBI on it. I didnt think the Vortec had the TBI. I was wanting too put the MPFI with the spider injector in the upper intake. the only issue i see is the return line in the fuel system. i guess I could just run a return line back to the tank?? and the throttle linkage, and the MAF sensor, and the O2 sensors??
DO NOT try to stick an automotive system on a boat, they aren't Coast Guard approved for mairine use and could end up costing a lot more than money if something goes wrong.
O2 sensors in marine engines is NOT common place. They are just starting to be used, and they aren't cheap, and the ECM's are nothing like automotive.
I have been searching for a while (even contacted the USCG directly - still no response) and cannot find ANY regs that deal directly with fuel injection in a boat. The CG regs (incuding the duplicated version in the "boatbuilder's handbook" do not once mention fuel injection in any way. There are flow tests, leaks tests, fire tests, pressure tests etc.... all of the plumbing, venting and "storage" regs obviously would still directly apply, un-ammended, but makes a "marine" EFI system "marine" other than black paint?
If you could point me in the right direction(as mentioned above - still no response from USCG) I would love to read the details about proper marine EFI installation.
