I think I understand this somewhat...TBI mixes the fuel/air like a carb and it all goes down into the intake together.

TPI injects the fuel in each runner of the manifold...or something like that? Or directly into the intake port?

My biggest question is, I seem to get the feeling that TPI makes more torque and that appeals to me. For a motor swap, is it worth it to go TPI over TBI? Is TPI harder to deal with in the swap or more costly to find in junkyard situations?

Just trying to weigh the pros and cons. I plan to do a swap sometime next year. Searching for little words like TPI is kinda tough.

try searching TPI* instead

I you the TPI route, use one in a 90+ vette or camaro.

tpi is definitely more complicated (i.e. more expensive)

Well, more complicated does not appeal to me, not only for installing it, but out on the trail.

I was just wondering if it was worth it over a well built TBI engine.

of i had it to do over again i would go the TBI route, MUCH cheaper, i believe i have about $1000 in JUST the induction system alone on my SBC. I love it but there is alot to go wrong on it.

I would stick with the tbi setup also. I have had one on my heep since somewhere in the late 80's when they where still fairly new to the dealers. I really have liked being able to go out and fire it when it is really cold out or still idle when on it's side. I have two complete tpi setups I have been wanting to put on but just can't force myself to put them on because of the part of not feeling good about something happening in the woods with the new setup. The tbi stuff I have done many swaps since mine so it is somewhat easy to trouble shoot now.

It really all comes down to what you want out of the rig? If your going to run in the dunes and such you will probably be more happy with TPI. It will allow you to build for much more HP & torque. On the other hand if you are useing the rig as a DD and rock crawling the TBI should work just fine. The real advantage TPI has is that the air fule mixture stays atomized all the way in to the cyllinders. With TBI' fule droplets will form as the air fule mixture travels through the manifold. FWIW I run a 90' chevy 350 TBI in my Jeep and love it. It's really a clean and easy swap. (But I do wish I had a few more HP)

I think I understand this somewhat...TBI mixes the fuel/air like a carb and it all goes down into the intake together.

TPI injects the fuel in each runner of the manifold...or something like that? Or directly into the intake port?

My biggest question is, I seem to get the feeling that TPI makes more torque and that appeals to me. For a motor swap, is it worth it to go TPI over TBI? Is TPI harder to deal with in the swap or more costly to find in junkyard situations?

Just trying to weigh the pros and cons. I plan to do a swap sometime next year. Searching for little words like TPI is kinda tough.
TPI puts the injectors at the end of the runners just above the intake valves. TPI set ups are not that complicated over TBI. You still have the primary advantage of having the computer produce trouble codes to lead you to the problem. And every TPI should have limp home mode to prevent failures from stranding you.

The important thing is that any TPI you put on be Sequential EFI (SEFI), vice Batch Fire EFI. Batch Fire set ups don't release fuel precisely as each cyl intake valve is about to open. It releases the fuel as batches of intake valves are about to open–less precise and not much better than TBI. Several aftermarket EFI set ups use batch fire. Most all late model OEMs are SEFI. And some of the OEM TPIs have waterproof computers available for stream crossings. For contrast, IIRC, GM's 4.3L TBI computer isn't waterprooff.

Careful when choosing a motor for a 4x4. Under towing and 4x4 conditions, a torquey truck's TBI engine will out perform a sports car's TPI high rpm engine. A torquey TPI truck engine is prolly best.

If you want to fuel inject an IHC motor, search under "fuel injection" on the Binder Bulletin's (http://www.binderbulletin.org/forums/?) tech talk. There's a guy who has been working on an 345/392 EFI setup for a year or so and has made some detailed posts.

Thanks, guys. I am familiar with the EFI convs. on IH engines, but I am planning on swapping the whole system out.

Good comments, thanks again. I am just looking for a light, simple, trail machine with EFI and an engine that does more than the 304 does on the highway. I could swap in a 345/392, but I think i will enjoy the weight savings, but I do want to keep a torquey engine rather than a screamer.

There is no TPI set-up for an IH motor. Unless you build one. Then there would be no need for it as a stock IH motor. But you would have Bling Bling!

TBI is great! :D

And the IH fuel injection board is on Just Internationals Binder Bench.
http://www.justinternationals.org/Binder-Bench/

http://www.justinternationals.org/members/eagle-mark/efi-motor-right.jpg

There's really no weight savings between the 304 345 and 392, well hardly enough to consider. But the 304 always out performs the others with MPG.

OK... Hopefully I can clear a few things up here. I really think the difference in price is pennies. Neither are very desirable any longer and the prices are cheaper for both. TPI is not SEFI, all TPI's are batch fire. Sequential didn't come out until the LT-1.
TPI will create more torque and better mileage. You will have more adjustability with cam choices also. The biggest problem with it is that most out there are for a 305 with 19# injectors. You need the 22# injectors for a 350. I would run one from a 86 thru 89 and have a prom burnt for a 89. The Mass Air is better for cam changes than Speed Density.
Both the TBI and TPI use all the same sensors and wiring. The only real difference is the intakes and injectors. You still have to buy all the little things that really add up. They even use the same distributor.
I would start with the TPI Swappers guide. It can be found on E-Bay along with good used TPI units, but as always make sure you know what you're buying first. The 305 units are a good buy and you can buy new injectors from Five-O-Motorsports for about $160.00.

I think I understand this somewhat...TBI mixes the fuel/air like a carb and it all goes down into the intake together.

TPI injects the fuel in each runner of the manifold...or something like that? Or directly into the intake port?

My biggest question is, I seem to get the feeling that TPI makes more torque and that appeals to me. For a motor swap, is it worth it to go TPI over TBI? Is TPI harder to deal with in the swap or more costly to find in junkyard situations?

Just trying to weigh the pros and cons. I plan to do a swap sometime next year. Searching for little words like TPI is kinda tough.

Are yuo set on Chevy motors? Why not look into a Ford SEFI swap from a mustang or truck?