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Old 06-22-2007, 07:14 PM   #1
sc2dave
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Default how would a tbi work on a mpfi manifold?

I had a thought,how would a tbi work on a later model engine IF it was setup properly,everything adjusted and connected and no check engine lights,and no fitment problems? would'nt this give the fuel more time to mix? I was thinking placing the tbi where the throttle body is at,or somewhere close to it.No,i am not contemplating this,just asking questions for curiousity's sake

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Old 06-22-2007, 07:20 PM   #2
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Default Re: how would a tbi work on a mpfi manifold?

It would work, but you may have to deal with the mixture distribution issues. The TPI intake was designed for dry flow. Doesn't mean it won't work with wet flow, but you shouldn't be too surprised to find you have lean and fat cylinders. A device that looks a lot like a Tornado placed under the throttle body will help to create turbulent flow to help. If you want to see what this device looks like, check out the Chevy Crossfire injection system. You could even make a carburetor work if you really wanted to.

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Old 06-22-2007, 09:36 PM   #3
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Default Re: how would a tbi work on a mpfi manifold?

Oh man. Why do you want to go with a relic like TBI? Ancient history man. I had a truck with TBI and they're pretty easy to work on and stuff, but ancient.

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Old 06-22-2007, 10:24 PM   #4
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Default Re: how would a tbi work on a mpfi manifold?

like i said in my first post:No,i am not contemplating this,just asking questions for curiousity's sakenow, how easy would it be to adapt a tbi to a hand-made intake manifold for a straight-6 chevy engine?it'll mainly be for cruising only,with mileage in mind.what would i need to do? the engine is in a 66 nova.

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Old 06-22-2007, 11:08 PM   #5
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Default Re: how would a tbi work on a mpfi manifold?

Its only a matter of matching up the base plate of the TBI unit to the base mount on the manifold. I'm guessing you're trying to update a carbed motor with a fuel injection system.

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Old 06-22-2007, 11:09 PM   #6
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Default Re: how would a tbi work on a mpfi manifold?

Now that you've narrowed down the engine size there are still quite a few issues you'll have to address; tbi implies all the sensors required to operate it as GM's first attempt at EFI wasn't reliable before succumbing to Bosch EFI systems. Even early Bosch EFI worked without a crank position sensor and used the mechanical distributor with electronic Hall effect sensors to generate ignition and most likely injector pulse timing. You may as well go find an early Chevy 6-inline (Citation?) with tbi and electronics but the major problems will be figuring out if the engine you have in mind can adapt to the various sensors of the past. Before throttle bodies were put on the early Saturn's, GM tried them on the Chevy's in the late 70's, early 80's and discontinued them by succumbing to the superior Bosch EFI system after struggling with design applications. Your '66 engine may be adaptable but it'll take some work to do it and you may be better off with the old but still reliable carburetor. A carburetor that can be taken apart, cleaned, float checked with the needle valve still working properly can work just as well as tbi. A question to ask is what is the compression of a '66 and if a little higher than EFI systems require will this work with 87 octane or will the compression have to be lowered with a thicker head gasket to reduce the chance of detonation (no knock sensors). Assuming you want fuel economy I excluded the use of higher octane gas. A six cylinder with a larger engine displacement will use more fuel than a four cylinder.

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