Converting 4.3L to 4.3MPI

[damie]

I have a 99 year mercruiser 4.3L 190hp alpha one.<br />Does any one know of a conversion kit to fuel injection?<br />obviously the main engine is the same all you need is the ecu,manifold,injectors and loom?<br />i would like to get to 210 hp that the MPI delivers.<br />Thanks.

 

[Don S]

Re: Converting 4.3L to 4.3MPI

Haven't heard anything good about the aftermarket setups, except for the Holley Projection series.<br />They have both TBI and MPI<br /> Holley Fuel Injection

 

[rayjay]

Re: Converting 4.3L to 4.3MPI

http://www.gmgoodwrench.com/perfpartsjsp/partlist.jsp?cat=9274&section=ce#12495515 <br /><br />Scroll down to the Ramjet 350 section and read about the MEFI controller. Maybe you can find out more about the marine applications.

 

[jimmythekid]

Re: Converting 4.3L to 4.3MPI

Originally posted by mariah 18:<br /> <br />obviously the main engine is the same all you need is the ecu,manifold,injectors and loom?<br />

dont be so sure.<br /><br />what about a fuel pump? And maybe a new fuel tank too? I can see this swap adding up to almost what it would cost to put in a carbed 350.

 

[Bondo]

Re: Converting 4.3L to 4.3MPI

Ayuh,...... It's not a very Practical upgrade.........<br /><br />Your Chioces are Retrofitting a Mercruiser System..........<br />Or,<br />Being a "Motorhead",+ Building Your Own System out of Other off the shelf parts.............<br /><br />Even the Holley Systems aren't quite Plug & Play............

 

[P.V.]

Re: Converting 4.3L to 4.3MPI

I sold Mariah's for 10 years and most of 'em with 4.3s (either 4 barrels prior to Vortec, and 2 barrells after Vortec) Vortec was a mid-year change in late '96 or '97, if I remember correctly!. Talking about 18 ft models. Anyway, the best "bang for the buck" is to invest in an excellent stainless prop. Will cost you about 500 to 600 dollars. I can think of no-one who would spend the dollars to "up-grade" from a four barrell to the mpi "just" to get more "horsepower" (but not cubic inches). Spend the dollars on a high 5 prop and the rest on your wife and kids!!

 

[WillyBWright]

Re: Converting 4.3L to 4.3MPI

I had a 4.3 with a 4-barrel that was rated at 210Hp. If yours is a 2-, that upgrade would probably cost alot less. I'm not sure MPI is available for a 4.3. I think only Throttle Body EFI is. I'm not all the impressed with GM MPI anyhow. It's not sequential.

 

[Don S]

Re: Converting 4.3L to 4.3MPI

Willy, look at the Holley link I gave above, they do have MPI for the 4.3's.

 

[damie]

Re: Converting 4.3L to 4.3MPI

O.K so lets look at the 4bbl thing, i currently have a 2 bbl i think! (engine no OL313397)can i convert to 4bbl what are the pros and cons and will it increase the ponys and if so what to?<br />if so what is the carb and kit i will need and where can i find it?<br />lots of questions i know.<br />Thanks.

 

[rodbolt]

Re: Converting 4.3L to 4.3MPI

for 20 HP its not worth it. save your money for cool refreshing beverages and gas.