I am only 15 and new to engines. I was wondering if someone (or many people) could please explain the differences in TBI, TPI, CFI, EFI, and Cross Fire Injection??????????? anything would be very, very helpful to me

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Benji

 

O.K. - once again, it's DFI 101.

Benji,

Welcome to the world of automotive enthusiasts. There are several common acronyms and terms you will get acquainted with, so I'll start with the common one from the top of my head.

DFI - Digital Fuel Injection. A generic term for electronically controlled fuel injection systems.

EFI - Electronic Fuel Injection. (See above)

TBI - Throttle Body Injection. A system that uses a common wet manifold and centrally located fuel injection unit (much like a carburetor).

CFI - Cross Fire Injection. A ssytem that used two TBI units and long intake runner tubes that crossed over the engine to the opposite side, and a plenum and single TBI unit for each bank of cylinders.

TPI - Tuned Port Injection. Another long runner design system that used individual fuel injectors for each cylinder and a dry manifold (no fuel in the intake - only air).

SFI - Sequential Fuel Injection. A system that uses a single injector for each cylinderthat are operated in a sequence that matched the engine firing order versus the TPI system where several injectors are "batch fired" simultaneously.



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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

Incidentally, for a good outline of general terms and functions, check this link:

http://www.weekendmechanicsclub.com/ACDelco/vobeng1.htm

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

WOW!! thanx vader ill research a little more and maybe i can start usiong the longo and actually know what the He** im talking about!! thanx again

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Benji

WANT- 88-92 RS, IROC-Z, Z28 Black 305 or 350 Tint Cowl Induction Hood White Gauges Cool Blue Lights 16" 5 Spoke Rims 50 Series Tires Flowmaster Chip K & N Filter
DREAM CAR!!!!

 

Ben G,

You might want a lot of things, but you really don't want the "cool blue" headlight bulbs. You might THINK you do, but...

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

[This message has been edited by Vader (edited June 28, 2001).]

 

Hey Vader,

Just curious.

Doesn't DFI also stand for Direct Fire Ignition. I work around new School Buses that have a coil for each cylinder on the 454 valve covers. That's what they call it. It's similar to the LT1 & LS1 set up. I haven't really studied the engines because they're in buses, so I don't know 100%, but it looks like each cylinder gets it's own coil. Not one coil for 2 cylinders like the LT1.

Plus, Direct Fuel Injection (or something like that)? I think that has the injector shoot into the cylinder through either the cylinder wall or through the heads, bypassing the intake port.

And don't forget CPI. Central Port Injection. Mainly used on the older 4.3L in S-10s and Blazers. Called the Vortec engine.

Sorry, just had to elaborate. HEHE Just trying to confuse the kid more, that's all.

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92 RS w/t-tops 305 TBI Auto.
170K miles and don't burn a drop o'oil
-K&N Truck filter #1500 w, open ele.
air cleaner
-Dynomax 2 1/2" cat-back
-B&M TransPak
-Jet Stage2 Chip
-180* T-Stat w/ 185* Fan Switch
-JVC CD--Alpine speakers & 4ch. amp
Rockford 2ch. to 2 MTX 12" subs

 

Vader just curous why do you not like the Blue headlights? Too *****? If so I agree. Just wondering

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Mike
1991 Chevrolet Camaro RS 305 TBI
My Website
Administrator at Auto-Clubs.net
Moderator at ColoradoF-Body.com
My Baby

 

Neo,

#1. Despite the claims of those selling the lamps, the fake blue tinted bulbs are not legal in the United States (USDOT 49 CFR, Subpart B - Lighting Devices, Reflectors, and Electrical Equipment, § 393.11 Lighting devices and reflectors. 47 FR 47837, Oct. 28, 1982]

#2. The true HID lamps (the ones that emit a bluish light) do not have a blue tint to the outer envelope. The light color is a function of the frequency of the high intensity discharge arc. They are actually clear glass lamps, and are therefore legal on motor vehicles.

#3. Higher frequency (blue end of the spectrum) light has a tendency to create more glare. This is only a problem if there is anything in the atmosphere that might be reflective, like dust, pollen, snowflakes, rain droplets, or water molecules on higher humidity days. The resulting "flare" can obscure the view of whatever is farther down the road.

#4. If this were the "hot" setup, the FAA would have them mounted on aircraft as landing lights. Since they tend to glare the pilot with reflected light, they aren't allowed on aircraft. Then again, pilots only have to see a runway a couple miles away when they use their lighting.

#5. They make it very easy to identify the uneducated drivers among the masses. If you want to categorize this as "ricers", I won't argue.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

Thanks Vader