Pull thru carb for a buick turbo on a 250

[xzerokidx]

My brother junked his 79 Riviera S-Type, so I pulled the newly rebuilt turbo before the tow truck showed up. Looking back, I wish I would have taken the carb too.

Just looking for options of what carb would be more suitable?
I dont know how comfortable I am with a 750-800 cfm Qjet.

 

[rbohm]

8) a few options for you, the autolite 4100 4bbl carb, the 1.08 model is rated at 480 cfm, or the edelbrock 500cfm carb. holley has the 450 cfm carb that would also do just fine.

 

[xzerokidx]

Thank you...

And the search begins

 

[jamyers]

I see no reason why the Q-jet wouldn't work just fine. It's an air-valve carb that only opens up to meet engine demand, and they worked fine on the 231-inch engines.

 

[xzerokidx]

I see no reason why the Q-jet wouldn't work just fine. It's an air-valve carb that only opens up to meet engine demand, and they worked fine on the 231-inch engines.

Problem about using the stock Q-jet is I don't have it. So I suppose now is the time to find one more suitable carb for the 250.

Now another question.

With loving the idea of a 4bbl mounted in front of the turbo,

Would the holley 500 2bbl work?

It would be a whole lot easier adapting to the log head once it changes from draw thru to blow thru.

 

[Anlushac11]

You can use most any carb for draw through since it works like a regular carb. The only thing is that back when I had my draw through carb turbo 2.3L 79 Capri Turbo RS the trick was to enrich the primary by one or two jets and bump the secondary jets by two to four numbers. The richer secondaries worked to add more fuel when the turbo kicked in.

 

[rbohm]

8) yes a 500 holley would work, but a 500cfm four barrel is better for driveability due to the smaller primary barrels that you would be running on all the time.

 

[xzerokidx]

Thank you for the replies.

Thinking more and more led to some interesting ideas, but in the end came to the same conclusion.

To keep it simple.

The 4bbl will definitely win with drivability and i'm not questioning that, it is the logical choice.

I'll stay with this setup for sometime because its a "want to" NOT "need to" have.

Using a 350 2bbl and supplementing extra fuel/water injection via an injector or ?, while doable, adds to the confusion and bottom line $$$. Id have to save longer and I should just build a MS and go efi yada yada yada from the beginning. Not happening on this project.

 

[Anlushac11]

Do a search online, there are several sites that have instructions for do it yourself water injection, and you use non detergent windshield washer solvent for injection.

 

[xzerokidx]

I've seen/read/know a bit on them, I've installed them before into a couple vw's when I worked at an exhaust/mandrel bending shop.

Being that this will be a draw through system first, I'm not planning to do much more than making a mount to support the turbo and carb, and the necessary plumbing to/from the turbo, carb, intake, and exhaust unless needed. While having more power will make the car more enjoyable to ride in, I have other projects in mind, namely the dream of a T5 swap that seems just a lil bit more feasible with the 250.

 

[Hotrodrobert]

On any pull thru, you need to boost reference the power valve. Even the stock Q Jet had a referenced power valve. Look on the carb section on this site.
If you don't do that, the turbo can pull so hard on the carb the power valve will close and lean out your mixture.