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-   -   427 6-71 dual predator questions (http://www.hotrodders.com/forum/427-6-71-dual-predator-questions-226520.html)

mrhp 11-25-2012 06:35 PM

427 6-71 dual predator questions
 
I am putting together a 427 bbc 6-71 blower and dual Predators. My question is about the carbs. I have 1 race and 1 street. Can I run progressive linkage with the street carb as the primary? I have done alot of searching and specific info on these carbs is spotty at best. There is/was a fella known as predatorguru or somthing similar and I would really like to talk to him, or somebody that can help me out. I hope to find real world experience, not theory. Thanks for the time!:D mrhp

vinniekq2 11-25-2012 06:58 PM

The north west suppliers name is Doug Hall,no idea how to get a hold of him anymore

techinspector1 11-25-2012 07:08 PM

Quote:

Originally Posted by mrhp (Post 1615812)
I am putting together a 427 bbc 6-71 blower and dual Predators. My question is about the carbs. I have 1 race and 1 street. Can I run progressive linkage with the street carb as the primary? I have done alot of searching and specific info on these carbs is spotty at best. There is/was a fella known as predatorguru or somthing similar and I would really like to talk to him, or somebody that can help me out. I hope to find real world experience, not theory. Thanks for the time!:D mrhp

I'd suggest that you poke around on the net and read all you can find about Willard Kendig. He was the originator of the Variable Venturi Carburetor. Articles about Willard will undoubtedly lead you to other articles and others and others. Sooner or later, you will have amassed enough knowledge to be the resident VVC expert. I owned a Kendig VVC many years ago.

Custom10 11-25-2012 08:07 PM

Without getting too far into it, so this VVC principle is that something that changes the diameter of the throat or what? I know nothing of these carbs. Whats going on there? I jusy remeber they were all the rage for a while and they essentially looked like a jack in the box,,,box.

mrhp 11-25-2012 08:41 PM

I have run Predators in single form with great success. The only reason it was removed was to meet class requirements, the engine had to make 15 inches of vacuum. The predator would produce 14.5-15 inches, but not steady. It was replaced with a 750 Holley and we made 15-15.5 inches. The performance of the truck stayed the same. I have never used them in a dual set up, progressive linkage, on top of a 6-71 before and am looking for some insight as to the fesability of this along with a beginning set up. Blower motors do not like to be run lean, and I would like to not hurt this new motor.

68NovaSS 11-25-2012 11:23 PM

You don't want to run progressive linkage on a dual carb setup, blower applications included, fuel distribution is one issue.

mrhp 11-26-2012 07:11 PM

My dual quad stroker ran o.k. with progressive linkage but better with straight linkage. Many 409 and other engines run progressive linkage with no ill results. I was told the blower helps with fuel distribution and that is why I was considering progressive linkage with the Predators. If the consensus is no then I will not do it. Like I said, Predators in dual form on a blower are new to me. If I wanted the easy route, I would build two Holleys and be done with it. But alas, I have never taken the easy path. Not to mention the Predators look fantastic on top of the 6 71.

68NovaSS 11-26-2012 07:43 PM

Straight linkage was JMO, you'll find lots of opinions I'm sure. I just wouldn't consider it on my bucket tunnel ram BB or the Nova 8-71 motor, even if it felt like it ran ok. On the other hand, I've had two '65 GTO's with progressive 3x2's, OEM...however, the primary carb is centered...:drunk:

xxllmm4 11-27-2012 04:03 PM

I have never seen anyone run progressive linkage with Predators. Basically they work off the air demand of the engine so there would be no benefit that I can see.

mrhp 11-27-2012 05:56 PM

My thought was it would be easier to control/tune/one carb at cruise rather than use both to cruise on due to it would be splitting up the cfm to both carbs at low speeds. I would think low airspeed split up between both carbs may cause a concern. Maybe not.

mrhp 12-01-2012 05:34 PM

predator carb guru
 
Hey Predator Guru, you out there?

mrhp 12-04-2012 02:25 PM

Is he there?

vinniekq2 12-04-2012 02:34 PM

did you follow techs advice? did you try to find Doug Hall?

mrhp 12-04-2012 04:48 PM

When I call Predator all it does is ring. I have no idea who Doug Hall is or how to find him. :confused:

techinspector1 12-04-2012 05:32 PM

Quote:

Originally Posted by mrhp (Post 1619068)
When I call Predator all it does is ring. I have no idea who Doug Hall is or how to find him. :confused:

Is this the number you're calling?
High Performance Carburetors by Predator
Here's the tech info from that site...
http://www.predatorcarb.com/predator_manual.PDF


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