50hp Merc

[looseunit225]

hey guys my mate has got a 50 hp EFI 4 stroke merc on the back of his fishing boat and it just really doesnt preform!

its slow out of the whole slow top speed and porposes sometimes!

i have made some adjustments to get rid of the porposing

But we want more HP

can anyone tell me if i can change the fuel and ignition mapping to a 60hp i know they are the same engine but the fuel and ignition mapping are diffrent so can i get a down load or do i need to change the computer if i need to change the computer where can i get one at the right price!

also the prop has a 12 X 13 vengance prop on it and i rekon personally the prop is way to small and should have something like a 12 X 17 on it!

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge RON

[Fast Fred]

cam, check to see if the cam is the same. NOS:eek::cool:

[looseunit225]

do you mean the actual cam or just the cam timming?

anyone got specs on the engine?

[Fast Fred]

yes, the cam shaft, make sure it is the same.:cool:

[looseunit225]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

[JohnsonM50]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

Being a dealer may or may not make the guy an expert.. you need part #s ;)

[JohnsonM50]

hey guys my mate has got a 50 hp EFI 4 stroke merc on the back of his fishing boat and it just really doesnt preform!

its slow out of the whole slow top speed and porposes sometimes!

i have made some adjustments to get rid of the porposing

But we want more HP

can anyone tell me if i can change the fuel and ignition mapping to a 60hp i know they are the same engine but the fuel and ignition mapping are diffrent so can i get a down load or do i need to change the computer if i need to change the computer where can i get one at the right price!

also the prop has a 12 X 13 vengance prop on it and i rekon personally the prop is way to small and should have something like a 12 X 17 on it!

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge RON
B4 doin any serious motor work check the boats basics, weight, condition of bottom, aqua/aerodynamics, setup and the best prop,, might be less pitch than whats on it. With all that sorted out then motor work can really help. :cool:

[Mark75H]

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge

Same as the std 60 ... there are NO changes to the powerhead for the FR engine

[mercguy]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

they have the same cams..........the ECM is different (different mapping), pretty much everything else is the same......

[looseunit225]

how do i get my hands on a 60hp computer than?

the boat is pretty new and a well known hull!

im going to run some diffrent props on it and see how i go also but really would like the extra HP

[mercguy]

how do i get my hands on a 60hp computer than?

the boat is pretty new and a well known hull!

im going to run some diffrent props on it and see how i go also but really would like the extra HP

Mercury Marine..................about $750

PS: the 40/50's also have a RESTRICTOR in the throttle body......you can remove it, but it will probably mess up the fuel curve mapping of the engine........possible damage!

[looseunit225]

sometimes im willing to make sacrifices to machine if man is not happy with the machine!

[OUTBOARDER]

you need to get a spare engine, send cam to Chet Herbert any cam any grind $39.95;)

[JohnsonM50]

sometimes im willing to make sacrifices to machine if man is not happy with the machine! NICE OUTLOOK! :D just dont tell the [old iron] teekers :eek::eek: heh heh.

[looseunit225]

engines still under warranty too so if it goes POP il just put the restricter back in and give it to the dealer

[Fast Fred]

NOS it:eek::cool:

[mercguy]

engines still under warranty too so if it goes POP il just put the restricter back in and give it to the dealer

its not that easy anymore................all the dealer has to do is plug in the laptop and the ECM will tell the dealer EXACTLY how that motor was ran or abused.................same as pretty much all new motors.............ETECS, Yamaha, Honda, Suzuki, etc............no more "misguiding" the truth...........;););)

[looseunit225]

but if the engine just leaned out and melted a piston how can they prove it was me that made the engine lean out?

[JohnsonM50]

but if the engine just leaned out and melted a piston how can they prove it was me that made the engine lean out? Im glad I run old junque, waaay beyond any warrantees if they ever had one. I build em run em hard & if they fail -I did. Wouldnt want to be in that truth or not argument... up to you.

[looseunit225]

whats the point of living if your not willing to take a chance or two?

[JohnsonM50]

whats the point of living if your not willing to take a chance or two? Id chance the motor, thats only money;)

[mercguy]

but if the engine just leaned out and melted a piston how can they prove it was me that made the engine lean out?

TRUST ME, we will know !!!!!;););););)