Da AZ Kid

I know chevy was working on 4.3 v6's for camaros for a while but never decided to produce these, usually they were tune port injected, this kind of sparked my curiosity. I know 4.3 v6s are similar to the chevy 350 and have heard some parts are interchangable. My question is would a TPI from a 305 or 350 actually work on a 4.3?

Apeiron

No

S10Wildside

You cannot attach 8 intake runners into 6 intake ports.

nascar2496

iTrader: (2)

the best intake/fuel system for the 4.3 is the 98+ vortec system. it uses a spider fuel system and is very reliable. tpi is just out of the question unless someone redesigned it totally to fit a 6 banger.

FireInMe17

And why should that be out of the question? I think it would be well worth it for those of us with 6 bangers as well as the S10 community who loves their 4.3L's. I can include myself in both of those groups...

A 60* V6 version, and a 90* V6 version, for someone who wanted to do it, theres money to be made...

PS: Sorry for reviving a dead thread

S10Wildside

A manufacturer will know that the market is too small for the costs involved.

Prototyping, testing, revisions, molds, fixtures, and so on. All of that for a lower base plate, runners, upper plenum, and fuel rail assembly.

Let's say you wanted to make a lower manifold. Someone has to design it, pay $30,000 or so for the sand cast mold, fixtures for CNC mill, and the milling itself.

Same for runners.
Same for upper plenum.

You still have costs involved with designing and manufacturing fuel rail extrusions and the CNC work involved there.

Dies have to be made for a gasket set.

Then The manufacturer needs to buy good quantities to get the best pricing. In other words, its extremely expensive to do a production run of 5 pieces.

Then you have emissions concerns (this limits the market).

Unless you have a mass market opportunity (like marine engine production), it is too costly to make a TPI system for V6 engines. And the marine manifolds are cast iron (enthusiasts don't want a heavy iron manifold).

Cost of production is too high.

FireInMe17

Yeah, if someone as an OEM parts manufacturer wants to do it and do it exactly step by step, and hit every single last detail. I'm talking about someone, one of us, that has the tools, and the time, and the knowledge to do it, along with help from this massive community. Its possible if some individual would be willing to do it, given there are a guaranteed number of those willing to purchase a final product. The initial cost of development, if done in house, could be paid for with a number of orders if secured. The biggest part would just be getting sensors to work correctly on an EFI system as complex as TPI.

All the proper dimensions could be ascertained from taking a TPI example and comparing it to the dimensions of a V6 intake/plenum. Make it all a ratio for each different intake, and then downsize it for 2 less cylinders, 2 less runners. Then, make the proper holes for vacuum lines, sensors, and so on. CNC machine could do all of that. If you can't do it with your own equipment, do it at a high school or local college. They would be more than happy to do it.

If all the numbers are the same for a V6 TPI intake as a normal V6 MPFI intake, then you wouldn't have to worry about adjusting sensors, or any of that. As far as the ECM would know, it would be operating just as normal, yet the performance would be improved.

Gaskets could be matched if designed correctly, and if its mounted in the same position as a normal V6 intake, then you would have no problems with the TV cable.

Of course the costs involved would be too large for a brand name company to do all the work to deliver us something that could potentially be home brewed. So why not?

GM already did all the work for us, its just a matter of adapting, and adapting is nothing thats hard to do....

305sbc

iTrader: (3)

http://www.michiganmotorz.com/images/DSCN4626-BIG.jpg


http://www.pacificp.com/forum/viewtopic.php?t=317

http://www.mercruiserparts.com/Show_...+and+Fuel+Rail

There's the marine version intake option,
The Edelbrock carbureted intake converted for MPFI option,
the custom sheetmetal intake option,

and there have been a couple of people that hacked two runners off of a GMPP ramjet350 intake and modified to seal up to the 4.3L. I have some pics of this, but not on this computer.

Having the individual external injectors makes it relatively easy to run the engine with a TPI ECM and code.
I'm sure someone could convert a TPI intake to fit, but it would be a LOT of trouble to complete.

FireInMe17

No.

CamaroIROC88350

iTrader: (1)

Why would anyone want to do this anyway? Just get a 3800 series motor from a 98-2002 Camaro V6 if you want better V6 performance. If someone wants TPI then they should just get a V8. Costs and trials would be too much for someone to be willing to develop a TPI system for a V6.

FireInMe17

No offense, but spoken from someone who doesn't understand having a Gen I 6/60

V6 guys will build hybrids, I say NO

V6 guys will turbocharge, I say NO

V6 guys will boost, I say NO

V6 guys will swap, I say NO, unless its a V8

Other than that, theres not much. Like I said before, GM did the work for us, we just need to adapt it. A hybrid is no better IMHO than a pieced up junkyard engine...boost is the for drag strip, and turbos are for people who wanted an easy way out.

CamaroIROC88350

iTrader: (1)

I'm not really sure how I would take offense to what you said but you don't know what I've had if that's what you were saying at first. I really like the 3800 series motor though, that was perhaps the best V6 GM made for the Camaro and Firebird, in my opinion.

FireInMe17

I just still can't figure out why they didn't start it off right and put a 4.3L in it and call it a day....

CamaroIROC88350

iTrader: (1)

I don't know, lol, you got me on that one.

KiLLJ0Y

iTrader: (1)

The only other stock mpfi from GM on a 4.3 was the Syclone typhoon engine , in fact it even uses an L98 throttle body. However to find that system for sale, is extremely rare. Especially the upper intake manifold.

S10Wildside

The throttle body casting is L98, but the linkage is all wrong for a TPI car.

The marine 4.3L vortec manifold has external injectors. I just purchased one brand new this past week for about $350 shipped. Includes manifold, cable throttle, fuel rails, and injectors.

305sbc

iTrader: (3)

I uploaded the pics of the Ramjet intake mod here:
http://s702.photobucket.com/albums/w...20vortec%20V6/

FireInMe17

Thats badass

Da AZ Kid

oh wow haha i havent been on here in a while i didnt think anyone was ever going to reply to this
you guys do have some interesting points though i appreciate you guys giving your opinions

Da AZ Kid

oh wow haha
havent been on in a while i never expected anyone to ever reply to this
but you guys do bring up isome nteresting points though
i appreciate you guys giving your opinions

doctorcad

Hmmmmm. 24x conversion with LS1 ecm?

I'm considering something along those lines myself. Any hiccups?

S10Wildside

You cannot run a 24x calibration with V6 engine.

doctorcad

58x with a 3 bolt DBW throttle body?

S10Wildside

Yes, that should work.