"Factory turbo setup for SBC"

[OutlawDrifter]

Looks like a draw through setup.

Nothing, at WOT. Less than that it can get sporty!

This is by far my favorite statement this week!

 

[454cid]

The last pic in the first post shows what looks like part of the adapter under the carb where there used to be pipe threads, that have been cut in half, but it also looks like a casting line there also, as in it hadn't been cut in half.

I noticed the threads too, and thought it strange. I also don't see GM using a Carter carb.... at least I've never heard of that before.

 

[CumminsFever]

Rajay turbo. High flow, extremely low boost pressure. I love old stuff like this, it's super cool! Wish I could hear it running on an engine. The rajay turbo has a very unique sound.

 

[Sean Buick 76]

It’s kind of functional however a CSU prepped Holley carb and a GT-45 in a blow through will make 100% more power.

 

[letitsnow]

Somebody wanted it, as it is sold.

 

[Erik the Awful]

It might not be the most up-to-date, nor most powerful setup, but it'd be pretty dang cool on a rat rod.

There was a lot of debate on draw-through versus blow-through setups on the RX-7 board I used to frequent. Draw through, like this, was more common. There's no more "danger" than there is with a roots blower. They're easier to set up because your carburetor is only dealing with ambient air pressures and an increased draw from the engine. With a blow-through setup you either need a carb hat and a sealed carburetor or a carburetor box, and a boost-referenced fuel pressure regulator.

 

[PWC Repair]

That setup is all about the cool factor on an old ratrod. I have an old Rayjay off a dumptruck around here somewhere. If a person wants it to actually run decent and make more power there are a multitude of better options available.

 

[Sean Buick 76]

I would go blow through CSU Holley carb 100x better than the draw through.

 

[Chebig]

Think of it like a roots style super charger with a really long flow path. I have seen more than one turbo setup like this, but can't say I've seen one on a SBC before. These have the worst turbo lag ever! First the engine bogs from lack of fuel, then the fuel hits and it runs super rich, blowing black smoke like a diesel until the boost finally come on, then you better hold on! My brother has one on a Porsche 914 fed by a Holley 600 4BBL, and another guy I know has one on a 600cc snowmobile. Both systems are totally cobbled together but they work. It is the poor mans turbo setup as you don't need a specially built carburetor or increased fuel pressure to compensate for the boost pressure. The carb basically works normally as it only sees normal vacuum and increased air flow with boost.

 

[Martin Evans]

T

I'm guessing it's a draw through turbo.

One of those pipes under the carb is before the turbo and one is after.

Thats what I was thinking, as well.