HELP W/ Cam upgrade 5.7 electronic fuel injection

[zero lash]

Motor is a freshly rebuilt 5.7 liter motor w/ Vortec heads EFI. It was bored 30 over. Only upgrades I have done is upgrade plugs and wires and thru hull exhaust. I really like to upgrade to a performance cam. Has anyone done this before or have any recommendations. Thanks

 

[Bondo]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Motor is a freshly rebuilt 5.7 liter motor w/ Vortec heads EFI. It was bored 30 over. Only upgrades I have done is upgrade plugs and wires and thru hull exhaust. I really like to upgrade to a performance cam. Has anyone done this before or have any recommendations. Thanks

Ayuh,.... What Efi,..?? What 'puter is runnin' it,..?? It'd take a software re-write to make it run right,....

Btw,... spark plugs, 'n thru-hulls really ain't any sorta Up-grade,...

 

[thumpar]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Be careful. You don't want overlap on a boat engine. If you do want to do this make sure you buy it specifically from a marine knowledgeable company.

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Fuel injected not carb I know people say that with a larger cam you need to re-flash the cpu. I know these cpu are pretty forgiving. AND so you telling me going from a standard plug to a v-fire makes no difference? Also from a 6.5 wire to a 8.8 makes no difference? Ohh wait letting a motor breathe better doesn't do anything either? Ehh ohh fregin guy get some pizza over heyaa

 

[thumpar]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Those plugs and wires won't do anything. Are you a car motor guy?

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Both car and boat guy. I have never tried to get more out of a boat motor before though. I just want to make sure I do as much research as possible. Any help is greatly appreciated.

 

[Bondo]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Fuel injected not carb I know people say that with a larger cam you need to re-flash the cpu. I know these cpu are pretty forgiving. AND so you telling me going from a standard plug to a v-fire makes no difference? Also from a 6.5 wire to a 8.8 makes no difference? Ohh wait letting a motor breathe better doesn't do anything either? Ehh ohh fregin guy get some pizza over heyaa

Ayuh,.... I asked Which/ What Efi,..?? There's Many systems available, some work, some don't,...

'n Ayuh,.... Yes,.... Affirmative,... That's Exactly what I'm sayin',...

The spark plugs, 'n wires are a Waste of gas money,...

Now, the Thru-hulls are nothin' but Noise Makers,... Nothin' more,...

The Choke Point of the marine exhaust systems is the common plenum manifolds,...

If ya spend several Thousand for actual Headers,.... Ya, you'll see abit of a boost,....

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Ok. So how does that help with a cam? Thanks

 

[Bondo]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Ok. So how does that help with a cam? Thanks

Ayuh,.... What Efi,..??

 

[Bt Doctur]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Do you know anything about exaust reversion?

 

[thumpar]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Do you know anything about exaust reversion?

That is exactly the reason for my first post. Motor heads want to cam it up but don't get the water in the exhaust part.

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

As far as the reversion goes I am not looking to go with something radical. I am not sure what lift and duration to look for.
Engine number is 0102580
Mcm5.7
Transom 01216504
Not sure if this dictates the type of ecu? Let me know where to check to get type.
Any help is greatly appreciated

 

[Bondo]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

engine number is 0102580
Mcm5.7
Transom 01216504
Not sure if this dictates the type of ecu? Let me know where to check to get type.
Any help is greatly appreciated

Ayuh,.... Yer serial numbers are Wrong,....

There oughta be a letter for the 2nd digit, 'n the same number of digits in each number,...

Is this a Mercruiser Efi,..??
Is it Efi, or Mpi,..??

 

[Tail_Gunner]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

What the guys are talking about need's to be taken seriously. In your current engine you have a 80's smog cam no overlap,going to cam that will make a difference will require a new tune to run anything short of that will not make a difference as to forgiving this is a boat and uses speed denstiy...no OS sensor's here for a suttle change.

Now with all that said only a mefi controller can be tuned... the merc 555 at this time is not able to be reflashed by a tuner.As to reversion it is a very real thing and to be guarded against...if you have a heavy cruiser setting deep in the water a stronger cam is not a good ideal they have a very poor static line. That also goes for a heavy deep v's that squat deeply when setting. Reversion happen's below 1200 rpm of course when the boat is sitting at it's lowest point in the water.

Other than that Tinker away it can be a sickenss if your not careful but then again that is half the fun of it...after all it is your boat and no one else's.

http://forums.iboats.com/non-repair...ercruiser-4-3l-need-advice-please-587005.html

There's a thread on static line and reversion. as to cams there is also reference's to cam types in that link. It all works together in the end.

Static line :Marine Engines- Water in Crankcase on a 2000-4.3-V6-Merc

The static line is a measurement of the true water line on the engine to the top of the riser.(example half way up the exhaust manifold.)The way you find the static line is to take a one inch clear hose that's about 15 feet long. You take one end and put in in the water the other end you fill with water and bring it in to the boat. You make a loop in it and hold it up against the engine with the top of the hose above the engine with the loop below the engine with water still in the hose. What you end up with is the level in the hose is the true water line. You then make a mark on the engine usally on the exhaust manifold and you measure to the top of the riser. This is the static line. The water line to the top of the riser. Since the roller cam being used in the marine engine it has made the static line be increased because of the duration of the cam being used.The positive pull on the exhaust on the compression stroke. All engine manufactures are fighting this problem. (Water reversation) The manufactures have redesigned there exhaust requirements when installing the roller cam engine. There have been extentions made that go in between the manifold and risers. New style exhaust flappers. Mercruiser has made a resignator and Volvo has done some redesign on there risers they have tried pulse tubes. Now they have new guide lines for there exhaust requirements. Now they require so much drop with 90 degree turns on each turn.

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Ok that's great information. I am checking in on those things and will post my findings. Boat its self is a 99 Searay 210. Fresh water only. It also is trailered in and out of water. Thank you

 

[zero lash]

Re: HELP W/ Cam upgrade 5.7 electronic fuel injection

Engine - 0L012580 TBI injected
Transom - 0L216504
I am guess but MPI would the Magnum motor which I do not have.
Thank you