3x1 vs 2V direct mount

[CobraSix]

In high School I ran an offy set up on my 60 falcon and once set I only cleaned them(carbon buildup) evey few months and sync'ed them up every 6 months when I did a standard tune up.

Set it right the first time and enjoy it.

You hit the two points I was trying to make. While they are not maintenance heavy, they require more then say a single 4V carb on an Aussie head (like I have now). I set mine up once, and have yet to have to do anything other then check it before the winter to reset the chock (I hate electric chokes, on cold days after driving ont he highway, it never goes off). I dropped the offy because it was a little much for a daily driven car that was getting 100 miles a day put on it. Had nothing to do with mileage, only personal preference of simplicity. Likewise, I don't have PS or PB on the car for the same reason. Since I put the Aussie on last year, I've only messed with the carb for about 10 minutes.

Once you set it up right, you should have minimal problems. But again, I wanted to go back to a simple system, not having to worry about multi carbs. If I were to do it again, I would recommend going cable throttle for the main pull vice the old linkage.

It was a nice set up though. A real eye catcher...and it really screamed.

Slade

 

[hotrodbob]

I have the old articals that were written about Ak Miller doing a 3x1 0n the 200 Maverick and for the time it screamed. I also have a 1960 artical from Hotrod Magazine and it says that Offy or Edlebrock worked with Ford to first develope this set up and it was an over the counter Ford accessory.

Ford was trying to catch up with MOPAR as they offered what was called the "HYPER PACK" options for the Valiant/Lancer. It consisted of a 4 bbl, header/exhaust and hipo head. They claimed 170 hp on their 170 cu. in. 225 hp on the 225 cu. six. There was also an alloy slant 6 back then. Ford was behind the 8-ball as the Falcon/Comets were just econo boxes with out any performance options at first.

Chevy did a good job right off the bat with the Corvair as it was standard with 2 carbs (110hp) and optioned with 4 (140 hp). Turbo came later and packed about 160-180hp. However, it was still a Corvair.

 

[ski4evr]

I checked again with Holley on the 300 cfm 1 bbl TBI's. They are no longer made... They have not deleted them from the website. The 400 cfm 2 bbl TBI's are available. A Holley rep told me they had the same bolt pattern (base) as the GM TBI. What does that mean? I saw adaptors on the Holley site for Holley 2300 to 2 bbl TBI. Looks like a direct mount situation to me

ski

 

[hotrodbob]

I'll assume that when you are talking about a TBI you are refering to a Fuel Injection throttle body for a non-port injected engine such as where the injector is in the throttle body rather then in the manifold runners.

If this is the case then you may want to check with "Turbo City" (http://www.turbocity.com/) as they make kits to use TBI systems on non-fuel injected engines.

They do not have a kit listed for our engines, but may be able to provide the adapter and other components that may make this work.

 

[Anonymous]

I have been running the same offy as shown in Slades pics with Webers. I have had no troble and had to do virtually no adjusting. Hood clearence on my 67 Mustang was an issue, I fabbed the motor mount brackets to give me the clearance I needed.

 

[Anonymous]

I've been considering a 3x1 for sometime. But wondered if a 3x2 would be any more beneficial (i.e. 3 - HW 32/36's)?

I'm currently in the process of fabricating a new linkage setup for (2) 32/36's that I plan on mounting to the log via 2x1 adapters. I thought about holding off on the linkage until I purchase my final carburator. Then, I would hook them up to be simultaniously working.

Once, the secondary's kick in...oh ya.

But, would that be too much?



-Chris

 

[hotrodbob]

If my memory holds, each of those carbs are about 275 CFM at WOT. Now go times 3 and you are dumping lots of air/fuel in when the loud peddle is to the metal. How modified is your motor?

 

[Anonymous]

Currently the engine is running close to stock specifications with the exception of the (2) 32/36's and DSII ignition upgrades.

Runs very well but no headers, after market camshaft or high voltage ignition.



-Chris

 

[hotrodbob]

Wow, two carbs on a stocker. I have one I bought from Stovebolt that will find it's way on to my Ranchero with a hot 200 with an Isky 262 cam, lots of head work and header. Not sure I will have enoug carb on that now.

 

[Anonymous]

I know, hard to believe but it works well.

I sent an email to FSPP about purchasing a camshaft. After that, headers and an ignition upgrade. Then...maybe a third carburetor.



-Chris

 

[hotrodbob]

My 200 is on the stand. I have most everything bolted up and ready to install. Now I just have to find the time to install it. Had it built 2 years ago and have not installed it. Took the old 170 out Thanks Giving weekend. Been on the road working all but two weeks since then.

 

[Soldmy66]

Two small 2 barrels sounmds like a great plan. Why would you want to do that via adapters, rather than direct mount?

 

[ski4evr]

Since the 1bbl throttle bodies are not available from Holley anymore, how about direct mounting one of these:

400 cfm 2 bbl: http://holley.com/HiOctn/ProdLine/Products/C950/C950TB/950-19S.html

670 cfm 2 bbl: http://holley.com/HiOctn/ProdLine/Products/C950/C950TB/950-20S.html

I've noticed that some people are running the Holley 2300 500 cfm units with success. Would the 670 cfm TBI be too much? Since it's a TBI setup, would having too much cfm available be a bad thing? No jetting - just setup the magical EFI curves, right :

Also, in the direct mount world, we still need some sort of adapter since the base of these carbs are larger than the footprint a log intake can give. I've seen several websites and magazine adds for carb / TBI spacers that increase torque, HP... Does raising the carb or TBI off of the manifold actually boost either torque or HP? Can direct mount setups on our log head benefit from taller adapters? Benefit from adapters with "swirl" or special "notch" designs cut into the openings? Below is a link to one said spacer (GM TBI bolt pattern):

http://www.cfm-tech.com/TBIPOWERPLATEinfo.htm

ski

 

[Anonymous]

Sounds like a good idea but you have to use a TFI ignition system with that kind of setup. I'm not sure one of those type of distributors would fit our motors.



-Chris

 

[ski4evr]

The Holley TBI setups can run without ignition control. It would be nice if we could use the ignition control - it won't work with our DS II or Pertronix setups. I surfed the web for a while looking into crank trigger systems so that ignition control would be possible. I got confused.

ski

 

[66200i6]

Just received a response from Holley. The ECU that is part of the 300CFM single unit can drive four injectors. So it would be possible to use the single kit with additional throttle bodies.

My last email was a request to receive the dimensions of the gasket for the single throttle body. This will prove if it is possible to fit on the late model log.

Wait and see, Ric.

 

[ski4evr]

Did Holley say or imply that the 1bbl's where still available? Holley told me they were not (via e-mail). They did tell me about the Commander 950 ECU being able to control up to four injectors. Also, that only one of the four injectors and only one of the throttle position sensors would be used for the idle control (IAC).

The unavailability of the 1 bbl's has shifted me from the 3 1bbl setup (direct mount or Offy setup) to a single 2bbl (670 cfm) or a double 2bbl(2 400 cfm's).

Only one injector/throttle position sensor for the idle control has shifted me into thinking of just the single 670 cfm 2 bbl. I can't see how an off-centered throttle body (whichever one of the two I choose as the idle one) could effectively control engine idle.

Any thoughts out there?

ski

 

[ski4evr]

OOps, forgot. I as well asked for the gasket/base dimensions. For "propriatary" reasons, I could not be given any prints/schematics/exploded views, but... the 2bbl throttle bodies have the same base as a GM 2bbl throttle body and that they are 4.5 inches tall. He did not tell me the 1bbl dimensions since they don't make them anymore.

ski

 

[Anonymous]

whats up