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Carb to EFI conversion ?

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Old 04-28-2008, 05:19 PM
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So can I bolt the square up to oval port ?? Get it to seal with the square gaskets ??
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Old 04-28-2008, 05:38 PM
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They'll bolt up but you're going to have flow problems. You essentially will have smooth flow right up until it hits that big step on all four corners. The oval is quite a bit smaller than the rectangle port, both shorter and narrower. Who knows if it will flow and how well.

Originally Posted by davepnola View Post
I could do the install my self and diagnose it if needed. .
You're going to have to possess some fabrication skills and the equipment to do it. It's more than a device that fits on top of your engine and is generic in application You're also going to have to get a laptop and programming software. This isn't anywhere near as easy as bolting something on.
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Old 04-28-2008, 07:26 PM
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This is what i took off. Fuel injection is great on stock. When you start making mods, Carb is a lot easier to tune. I've seen the same set up on the 454 MPI. A friend had one in a Baja 24 Outlaw. Not sure about the ports, oval or rectangle though.
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Old 04-28-2008, 07:37 PM
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I think that if the square are bigger it should work and seal.
Once again I not worried about major hp gains. My motors are 330 hp factory. I think the EFI version are the same 330 . I think though the camshaft would have different specs than the carb cams, though the ECM with sensors hooked up should be able to compensate for the small difference. Now if I were to use the Blue manifolds 502 hp setup, that would be a different story in tuning. My guess is the parameters in the mapping of the chip would be the difference and the CFM of th intake and runners would be larger. Does someone have spec book on the efi engines ??
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Old 04-28-2008, 11:51 PM
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Originally Posted by davepnola View Post
I could do the install my self and diagnose it if needed. My concern is not performance but Safety with carb motors . Fuel injection is more of a closed fuel system . Did they make EFI motors with the oval ports. Look at this setup. http://cgi.ebay.com/ebaymotors/ws/eB...244450805&rd=1 would this work . My boat came with the Efi option my year , I just do not have it and would rather the efi setup.
Safety?????

You said they are 1997 engines. They have been fine for 10+ years.

Seriously, As long as they have the flame arrestors and the carbs are not leaking, they will be fine.
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Old 05-04-2008, 10:16 PM
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Ok I am looking for this type pf EFI take intake setups ?? Please let me know if anyone has these from upgraded motors . Thanks
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Old 05-04-2008, 11:55 PM
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I have done this same mod to my 84 scarab last winter when I redid my motors and let me tell you it was the best money I have ever spent, turn key and starts every time, it kills the motor when it gets hot and loses oil pressure. I did an hp500 cam and exhaust and a few other mods and I just to sent my computers to Hardin marine and told them what I did and they flashed my computers and then I was on my to trouble free boating. Oh by the way the 502 and 454 setups are the same except for the programing on the computer even the injector flows are the same.


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