New to Forum , BUT not new to Engines , been reading and !

[FalconSedanDelivery]

I have been watching the progress of the New aluminum head and the other engine builds and feel I have to interject on something CARB MOUNTING !! I have been a racer ( Drag) for 30 + years and have built and raced many different combos , and helped tune countless others , and every Inline engine that I have worked on runs better if the primary's face the valve cover , if you run them inline (as I have noticed on most setups here ) the cylinders rear of the carb will run rich , ahead lean , this applies to two and four barrel Holly style carbs , inline looks cool BUT causes fuel distribution problems , now if its a all race combo , it dosent matter as much since all 4 ( or 2 ) holes go from idle to wide open , which lets the intake do its job , BUT on a Street vehical,the direction the throttle blades (at part throttle ) have on the airstream move it rearward when its mounted inline !. I am only trying to help and inform , and hopefully make some new friends here , till later , Faron

 

[fordconvert]

Im not clear on what you are trying to explain, do you have a picture or could you explain the orientation differntly? I get the theory about part throttle but cant picture in my mind what you mean by facing the valves vs. inline.

 

[FalconSedanDelivery]

If looking at the Engine from the front ( on a 144-250 Ford 6 ) the primarys on a holley ( or Autolite / Motorcraft Carb ) would be parralell to the valve cover and the throttle lever in the lower right corner ( if looking from above ,

 

[Stubby]

At part throttle, the flow tends to be directional. Look at the butterflies while they are partialy open and try to visualise the air flow. It will come off the butterflies at an angle.

On two barrel race motors (V8) this happens and favors the front or back cylinders depending on the direction of opening. The solution on a V8 is to run an adjustable adapter plate and slide the carb forward or back.

On an inline engine, with the carb sideways, the flow will angle towards or away from the head. This isn't perfect, but it's better than towards the front or back. Plenum design becomes important here. Now that I think about it, the new intakes with a 2V setup, might benifit from mounting the 2V offset to the outside of the plenum. This might help keep it from favoring the center runners.

I also feel that the best setup for a long inline like the six would be two progressive 2V carbs on seperate plenums. If each carb feeds only three cylinders and the primary side is farthest from the head, with the throttle blade opening towards the head, there should be less distribution problems. There will be more tuning problems with two carbs and the primaries will need to be small, but it should yeild good drivability and power.

 

[fordconvert]

So a factory 1100 would be the 'right' way with the throttle shaft parallel to the crank and the log? When you say secondary that means you are dealing with a progressive linkage which may or may not be a spread bore style also? All the 2bbls I have messed with (not many) have just had both throttles on one shaft so I would assume that means that there is not a primary and secondary just 2 bores. Most of my messing around has been with Q-jets so the 1 bbl was new to me. I have never looked close or worked on the 2bbls that most people are dealing with here so that could be why I am so confused.