Hi all,
here is my understanding on the induction system that is available to our car. I am not a expert on the subject. I hope you find it helpful, and if anyone think the infomation i provide isn't right, feel free to correct me. So i can learn as well. Then maybe someone can write a tech article about it.


i list them in term of cost
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carb
(holley, carter, rochester qjet(edelbrock performer))
summary:
everyone know how carb work.
The theory is simple, but to tune it is a art form.

good:cheap, no electronice stuff to worry about, jetting is easier than burning chip/ rewrite fuel map.
bad:tuning experience require, not very force induction friendly, cold starting is a female dog.

tbi
*tbi is a electronic carb.
really depend on how you look at it. It have some advantage over carb(cold starting, better milage), but it also inherantence some problem from both efi and carb.

multi port injection
(accel pro ram/holley projection/edelbrock pro flo efi)
summary:
The PFI system uses one injector for each cylinder located in the intake manifold, just at the base of the intake valve. This results in increased fuel efficiency, as the atomized fuel is not mixed with the air until it is needed(dry runner) - as the air is entering the cylinder on the intake stroke. Injectors may be controlled in banks, in pairs, or individually depending on the system.
advantage:The mentaility is If you want to save money use carb, you want efi, go tuned port. Personally, i tihnk this is the best compromise. Accel pro-ram is a good example, it's track proven not to mention the fact the dfi software allow you to tune for force induction.

disadvantage:i can't really think of any, except it isn't very exotic. And kind pricey...

tuned port
(tpi/lt1/superram/mini ram)
basicly a fancyer version of multi port injection. The runner is tuned to centern power rpm band. Shorter runner(lt1,mini ram) move power to higher rpm, longer runner move power to lower rpm range(tpi).
advantage:looks cool, the feeling when you are in your power band... gotta love that lt1 when 3500 rpm hit, it's like a turbo...
disadvantage *****, tuning require

force induction:
summary:
force more air(via mechancail mean) into the combustion chamber. more air + more fuel = more power.

requirement:lower engine compression ratio, higher boost require more fuel(major tuning of fuel map).

draw through:
fuel enter in front of the air compressor good:simple....
bad:everything else
exception:roots style or whipple supercharger(6-71, 8-71). work quite well with draw through and also allow water to air intercooler.

blow through:
fuel enter after the air compressor
good:allow intercooler, better throttle response and everything else.
bad:complex plumbing

this is just a very very generalization. Each induction system have at least tens book on them. Plus the fact i am still a engine newbie.....

dw