Yet another injection question

[Freedster]

Hello all!

My first topic post, so please be gentle. :)

In looking at the prices of the various aftermarket injection systems available, I was thinking that it might be more affordable to take an OEM system and trick it into working on the BBB. Considering the huge number of EFI 454's and 502's that are still going into trucks, RV's and boats, I should think that it wouldn't be too hard to find (or piece together) a complete unit in the junkyard. A TBI could probably bolt right up, and if you drilled your own manifold, a multi-port could probably be made to work with a minimal amount of fuss. From a theoretical point of view, I should think that a system designed for a 454 should run just fine on an engine one cubic inch larger.

I see this as having 2 advantages:

1) cost
2) Pre-programmed system that idles and runs out of the box.

So, is this crazy, or am I on the right track?

Thanks!

- Freed

[btc]

Find out what the systems' hp limits are. Yeah, the one cubic inch won't matter, but if you're making 400 - 500 hp with a 300 hp fuel system, it might. Then again, there are supercharger systems available for these engines that don't require much modification, so you might be able to get away with it with little or no upgrading.

[GSXMEN]

If you're a machinist and/or a welder, it would help ALOT to keep the cost down! Of course, you will need to purchase some specialized cutters for the injector bosses!

The project sounds like something that could definitely be done though!:TU:

[alan]

Sounds like a cool idea, but I would want to make sure I could disable the part that limits the top speed. That would be a major bummer at the track! :Dou:

[my-78]

I don't think the TBI setup would be very hard at all, your cam choice might be limited though. www.turbocity.com has everything you would need. I bought a complete TBI setup from a 89 caprice-9C1 for $100, The best bet would be to find one a chevy truck, that way you would have the right ECM to use the turbo city wiring harness. this was my original plan until I found out the buicks like bigger carbs than chevies, now I'm undecided. I also think alot would depend on having a new chip burned.

The thought of an offy with dual 2" TBI'S is still looking good though.

Paul

[Freedster]

:grin:

[Greg]

Don't know if you know this... but... the 1975-77 Cadillacs had a port FI system by Bendix\Bosch that might be adaptable to your application. There were two versions. One for the 500 CID Caddy's and the other for the Olds 350's used in Sevilles. It's a pretty simple set up. System is triggered by a unit within the HEI Distributor. I'm told that the 500 CID throttle body flows way more air than the Olds 350 one. The system is self contained. Just uses an analog computer, throttle body, sensor for water temp and air temp, MAP, fuel regulator, injectors and wiring harness. Pic of an Olds system is below. A buddy of mines brother scarfed a set up and modified the Caddy distributor for use on a Big Block Chevy. Ran real nice as is. Granted, it's old, but it seemed to work quite well. If you get all off the parts and modify an intake... Hmmm..... just a thought.

Greg

[Leviathan]

...hmmm... anyone know of a good stack port injection system?