Carb Question (SCV)

[james singleton]

Does anybody know what effect you will have running a "NON" SCV (Spark Control Valve) carb with a Load-A-Matic distributor instead of the called for SCV carb???? Will it be just a performance thing; or will the engine not operate effeciently at higher speeds (or lower speeds/@idle??), or what??? The reason I ask is that in rummaging through some of my old parts today, I noticed that a Motocraft 1940 carb that I had problems with many years ago was a factory produced "Non" SCV carb that I had installed with my Load-A-Matic distributor not knowing any better at the time! It had run fine for a while, but then started dying at idle! So what effect does a Non-SCV carb have with a Load-A-Matic???? Thanks, Jim

 

[wallaka]

I've been running one for a couple of years. I've had no adverse effects except that the engine is a total dog, even compared to the same year 200/C4 combo. It runs smoothly, but the lack of spark advance kills power over 1800 rpm or so.

 

[Bort62]

You won't have the correct spark advance. As a result, your engine will run like poo.

 

[james singleton]

Wallaka & Ian, thanks for your replies. I have a 1940 carb that I am trying to determine whether or not it is a "low" vac, or "high" vac carb that will work with my Load-A-Matic distributor; and if it is a "high" vac carb how would it perform with the Load-A-Matic!?? Thanks, Jim

 

[addo]

Vacuum strength will reflect where it's taken from.

If the vacuum-inducing hole is right near the venturi, high airspeed will induce high vacuum. Further down in the carb throat, vacuum will be lower. Below the throttle plate it's manifold vacuum conditions. An SCV type carb will always have the 1" octagonal fitting on one side of it.

Regards, Adam.

 

[CZLN6]

Howdy James and All:

There are two good "stickies" at the top of the small six forum. One is "How the SCV works" the other is "Load-O-matic Distributors".

The poor running conditions of a Non SCV carb and a L-O-M distributor will not happen as you described. Your symtom is likely due to something else. You can read the effects of a mis-match in the L-O-M" sticky.

That's why you should never put your Levi's and Wranglers in the same drawer. You don't want to mix your genes.

Happy New Year!

Adios, David