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TOPIC: Upgrading Mercruiser 165 to throttle body

Upgrading Mercruiser 165 to throttle body 1 year 7 months ago #122443

  • Ike
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My 1972 Sea Ray has a Mercruiser 165 (GM 250). I had the Rochester 2GV carb rebuilt 4 years ago, but it still has some problems with flat spots and stalling, all of which I am familiar with and can work around by playing the throttle. But it is getting worse and I have been looking at replacements. (this is the OEM carb and is 44 years old) Of course I can just buy a new csrb and drop it on and problem be gone. However, I got to overthinking this as I am wont to do (I'm an engineer, LOL), and was looking at throttle body fuel injection. The throttle bodies are cheap, but the rest of the package isn't.

Have any of you done this on an old inboard engine. If so how complex is it? If so does it significantly improve the engine performance? I am not as interested in HP improvement as in smooth running without flat spots, stalling etc. Of course better fuel consumption would always be welcome.

Any constructive thoughts on this would be welcome.

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Peter D. Eikenberry
newboatbuilders.com
newboatbuilders.blogspot.com
"Don't tell me that I can't. tell me how I can."

Re:Upgrading Mercruiser 165 to throttle body 1 year 7 months ago #122480

in order for an EFI system to work, it uses the following parameters:

Water temp
air temp
air pressure
manifold pressure
rpm
crank shaft position

Also, will require a high pressure fuel delivery system

typically the efi advances the spark electronically

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Re:Upgrading Mercruiser 165 to throttle body 1 year 7 months ago #122600

A big expensive undertaking, probably not worth the gains and effort. A well rebuilt carb and fuel system should provide years of reliable service if set up correctly, without any drama.

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