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CHEVROLET COUNTRY \/6
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560 Posts
Discussion Starter #1
What is the difference between TBI CPI and all the others in S-10s and what do they mean. one other thing will porting my intake help power any.
 

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Project: Sabriel
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12,507 Posts
TBI is junk, pre-1996, low power, glorified carb. CPI is the best system, in terms of power, resembles a TPI system, used for a short duration (believe 1992-1995). the new engine has CSFI, i believe, and are in the middle of TBI and CPI. porting will increase power.
 

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QuickerPICKerUPer
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302 Posts
TBI(throttle body injection) is like a computerized carb.
CPI(central port injection) is a step above TBI it has a single injector with 6 poppet nozles going to each cylinder.
the newer 96+ trucks have MPFI(multi port fuel injection) still uses a similar setup to the CPI but fires each cylinder by itself. CPI and TBI batch fire (send fuel to all the cylinders at once.
when I rebuilt my engine I ported and polished my intake. It probably will not greatly enhance your hp but it will be a gain. maybe 5hp without any head work, exhaust, ect.
 

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CHEVROLET COUNTRY \/6
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560 Posts
Discussion Starter #4
my TBI intake is the most ristrictive looking peice of shit i have ever seen. you can tell its a choker.
 

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CHEVROLET COUNTRY \/6
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560 Posts
Discussion Starter #6
im talking about intake manifold looks like restrictive shit.
 

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CHEVROLET COUNTRY \/6
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560 Posts
Discussion Starter #7
does any one else have any info.
 

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Project: Sabriel
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12,507 Posts
yeah, check Edelbrock. they have replacement intake manifolds there.
 
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