Ya.. what's the difference, on carbs, with manual and electric choke... And.. what's the secondary vacuum thing...

Basically, anyone have like a... "Carbs for dummies" site?

 

manual choke naturally would be manually operated and an eletric choke would work off of an eletric source. secondaries run off vacuum instead of mechanical

 

i'm not a complete moron my friend. I know that much. BUt what's really the difference. Like.. what the hell is a secondary for.. and what the freak w/ manual choke, you have to go under the hood and mess w/ it? or what.

i shouldn't of read this post this morning, that just set my day to for well, you know.

 

A manual choke is usually operated by a push-pull cable that's routed to the inside of the car where you can get to it easily.

An electric choke is closed by a bi-metalic (temperature controlled)spring. A small heater inside the elec choke housing slowly heats up the bi-metalic spring and after a few mins, moves the choke plate to the normal open position. The heater is power from the ign circuit so as soon as the ign is powered the heater starts heating.

 

Don't get get :glad: , lol

Nobody called you a moron. Does sound like you need to go through a book on your favorite carb and get familiar with how it works. Recomend something in particular? Head over to your local bookstore and browse the automotive book section. There WILL be at least a handful of titles dedicated to tuning and repairing holley and / or Qjet carbs. If you don't have a big local bookstore, even a good auto parts store will usually have Troubleshooting and repair guides for a few different types of carbs. For example, I have a haynes manual for rochester carbs that does a great job of explaining how everything works and is related, got iy for a few bucks at pep boys a few years back.

 

http://auto.howstuffworks.com/question377.htm



www.howstuffworks.com -- cool site to check out.....

 

thankyou to both of you. :-)

 

As for you're second question; 4 barrel carbs have 2 primary venturis towards the front and 2 larger secondary venturis towards the rear of the carb.

The primary venturis' butterfly valve/throttle shaft is connected to the throttle cable.

With vacuum secondaries, the rear venturi's butterfly valve/throttle shaft is controlled by a vacuum actuator. The actuator get its vacuum from a port in the primary venturis. As more air flows thru the primaries, more vacuum is generated at the port which in turn, opens the secondaries further and further.
This arrangement prevents the secondaries from opening too fast and overwhelming the eng with too much air/fuel mixture, which creates "bog".

With mechanical secondaries; the butterfly is opened mechanically via linkage to the primaries throttle shaft.

The mechanical type will provide immediate full power if the carb is properly sized and tweaked-in perfectly. Mainly used on the track.
The vacuum type only gives the eng what it feels it can take and sizing isn't as critical. Works well on the street and adapts to eng mods better.