Carbs to EFI Possible?

[JohnnySCV]

I did some searches and didn't see anything on this, so I apologize if this has been discussed in the past.

I have a 1992 200 HP mercury 2.5 liter with 3 carbs. I know they make and EFI model as well. My question is this, is converting to fuel injection possible, and by possbile I mean within reason, and if it is possbile is it worth doing so?

Thanks for your input..

 

[j_martin]

Re: Carbs to EFI Possible?

I did some searches and didn't see anything on this, so I apologize if this has been discussed in the past.

I have a 1992 200 HP mercury 2.5 liter with 3 carbs. I know they make and EFI model as well. My question is this, is converting to fuel injection possible, and by possbile I mean within reason, and if it is possbile is it worth doing so?

Thanks for your input..

The guys at Scream and Fly can take a box of junk parts and make a race motor out of it. I'm sure the conversion is not only possible, but probably not very difficult, at least for them. They'd be able to answer your questions.

Sign up, then go to Tech Talk. Look around using the search feature first. Post #1 better be fairly intelligent. They're a scrappy bunch, but would give you the shirt off their back.l

hope it helps
John

 

[Faztbullet]

Re: Carbs to EFI Possible?

Yes it can be done, on difficulty rating of 1-10 it about a 8 and you will need a donor motor to get all the parts(linkage,intake,vst,ecu,bracket,etc) to convert.

 

[sschefer]

Re: Carbs to EFI Possible?

Yes it can be done, on difficulty rating of 1-10 it about a 8 and you will need a donor motor to get all the parts(linkage,intake,vst,ecu,bracket,etc) to convert.

Yep, a donor motor is the best solution. The closer the match the better. Been toying with the idea myself for my next project motor.

 

[JohnnySCV]

Re: Carbs to EFI Possible?

Thanks for the input, I think I will start looking for a donor motor to start pulling parts off. Will I see enough of a difference to make this all worth while?

 

[Dukedog]

Re: Carbs to EFI Possible?

Not gonna be much difference performance wise. Just easier start. A little smoother idle and a little better response MAYBE. Way to many movin' parts and electric parts (unless its all new) ta no what your gonna get in a "used" efi set up. Main parts are tha injectors and ECU. With these you got 'bout 50/50 chance they are good. Most, not all, of tha efi motors that ya see broke and I mean REALLY broke, its usually fuel deliverly (ECU/injectors) if not heat related. Look for a '96 ta '99 system. It will have tha newer style VST and pump and digital ecu. A well tuned carb motor will do everything tha efi will except tha startin' part.
If you go ta S&F just do your research and ask a lot of ?'s. That board is not what it USE ta be. Lotsa new people............

Ain't that right John!

JAN, If ya try ta peice one together get on here and and ask tha ?'s. Their's several folks here that could guide ya through it and probably have any parts ya need......................D

 

[sschefer]

Re: Carbs to EFI Possible?

Thanks for the input, I think I will start looking for a donor motor to start pulling parts off. Will I see enough of a difference to make this all worth while?

My research tells me no. The advantage is more precise fuel control but that gain is not going to be significant in a stock engine.

 

[JohnnySCV]

Re: Carbs to EFI Possible?

As usual, the members of this forum have supplied me with the info I need! Thank you! It seems that a can or two of powertune may be the best option at this point. When I have the time (and money) to take on a project like this I may decide to do so................... until then I"ll be fishin' with my carburated engine... thanks again!

 

[j_martin]

Re: Carbs to EFI Possible?

Not gonna be much difference performance wise. Just easier start. A little smoother idle and a little better response MAYBE. Way to many movin' parts and electric parts (unless its all new) ta no what your gonna get in a "used" efi set up. Main parts are tha injectors and ECU. With these you got 'bout 50/50 chance they are good. Most, not all, of tha efi motors that ya see broke and I mean REALLY broke, its usually fuel deliverly (ECU/injectors) if not heat related. Look for a '96 ta '99 system. It will have tha newer style VST and pump and digital ecu. A well tuned carb motor will do everything tha efi will except tha startin' part.
If you go ta S&F just do your research and ask a lot of ?'s. That board is not what it USE ta be. Lotsa new people............

Ain't that right John!

JAN, If ya try ta peice one together get on here and and ask tha ?'s. Their's several folks here that could guide ya through it and probably have any parts ya need......................D

I think there's one on that board that's racing a 2.5 on E85. If you wake up the lizard, you'll get more "experience" in one post than you can use.

Different world fer sure. For one thing the moderators don't wreck their elbow slashing and parrying.

John

 

[j_martin]

Re: Carbs to EFI Possible?

As usual, the members of this forum have supplied me with the info I need! Thank you! It seems that a can or two of powertune may be the best option at this point. When I have the time (and money) to take on a project like this I may decide to do so................... until then I"ll be fishin' with my carburated engine... thanks again!

With engines and computers, there seems to be a bent to try to fix a problem with a conversion. I don't think I've ever seen it work.

If a carb'd engine is in good tune, you run good fuel, you know the quirks of your particular engine, and the stars are aligned, it'll start just fine.

It took me a couple of months to get the new to me XR4 properly tuned and learn it. Now, in any weather from steamy to icy, I seldom crank more than 3 seconds on a cold start. Usually a bump of the key after that.

Start with a compression check. If the engine isn't in decent mechanical condition, nothing you do in the tune department is likely to make sense, much less help. Then detail all the tune items in your spare time. You can have it down to the front half and check everything for 'bout a hunnert bucks in gaskets and tune up parts. More if it needs reeds, of course.

Go for it. You'll get all the help you need right here.
John

 

[Dukedog]

Re: Carbs to EFI Possible?

I think there's one on that board that's racing a 2.5 on E85. If you wake up the lizard, you'll get more "experience" in one post than you can use.

Different world fer sure. For one thing the moderators don't wreck their elbow slashing and parrying.

John

Don't believe everythin' ya read 'bout tha e85 racin' stuff

Ya could rattle Rex for a little information but might not be to many on here that would have a clue as ta what hes sayin'........................

Both my "everday" motors are carburated and I'd put either up against any Laser inj. motor. But my bad azz "Sunday" motor is a different story

Later...........D

 

[j_martin]

Re: Carbs to EFI Possible?

I was just trying to make the point that there is a huge store of experience and information there, most of it aimed at fast.

I like my carbureted engine. When I mash the throttle, she spools up quick and gets gone.

John

 

[Dukedog]

Re: Carbs to EFI Possible?

I like my carbureted engine. When I mash the throttle, she spools up quick and gets gone.

John

Me too...........

 

[JohnnySCV]

Re: Carbs to EFI Possible?

Compression is 110 on the lowest cylinder and 116 on the highest cylinder. From what I have read that is acceptable. I really thing a can of powertune and some new plugs will help the rough starts

 

[sschefer]

Re: Carbs to EFI Possible?

Compression is 110 on the lowest cylinder and 116 on the highest cylinder. From what I have read that is acceptable. I really thing a can of powertune and some new plugs will help the rough starts

I run Quicksilver Quickclean in my fuel all the time. Plug changes are a matter of opinion. I think often is good others shoot for once a year but when you don't know the motor, change em for sure.