Thread: whats wrong with the carb

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im helping my freind with his 351 winsor in his 84 stang, with five speed. the car bogs out with full throttle. it has a edelbrock 600 cfm carb. we rebuilt it changed the metring rods and everything else possible. we checked the fuel pressure 5.5-6.0 set the timming 12 inital 34 total. we played with timming and tried another 600 edelbrock and a 750 but have the \same problem anyone have any ideas. the thing is drinking gas like its at the bar. the blugs dont look to bad and the engine has steady vacume im lost.

have you checked for a pluged cat......ted

you should have an air valve in the secondary barrles. you can reduce the weight of the air valve by grinding metal off the counter weight on the valve but don't go to light you will vbog al the time.it's trail and error. there is a book on carter carbs. it's an older book but you should fine on the internet.

The Edelbrock carburetors are great units but they tend to run rich out of the box. I’m more of a Chevy guy and have used the Performer and Thunder series Edelbrock on 305 to 454 cubic inch engines and with very few exceptions I’ve had to lean them down on stock and near stock engine configurations.

Is this a new carb? If so, you should have received a fairly comprehensive manual with it that you really need to read and digest. If not, down load here: http://www.edelbrock.com/automotive_...406_manual.pdf (make sure you get he one for your carburetor.)

Study the “Calibration Reference Chart” and determine what conditions you have. Your comment on “drinking gas like it’s at the bar” and my insides tell me that you’re rich and you will need to install leaner jets and metering rods. A size (or two) makes an incredible difference at WOT. Note that you will need a new gasket (number 28) when you change the jets.

The counter weight mentioned above is called “Air Valve & Weights” (number 42). I would not recommend grinding this as it is a precision component and designed to bring secondaries on only when there is sufficient vacuum.

Hope this helps.

Regards,
Glenn

check the firing order the 351 uses a different firing order than an 302. i

Check the accelerator pump on the carb. look down the throat with engine off, and pump the throttle while watching, there are 2 squirters that should blast a hard stream when you give it the gas in the 2 front chambers right beneath the choke plate, you can't miss seeing them in action. If they are gummed up, when you hit the gas you create a lean condition(too much air not enough fuel) this will cause bogging and can cause backfiring. The edelbrock carbs when tuned right are a good unit. I have a carter AFB(predecessor to Edelbrock) I rebuild it once a year, it takes about a half hour to do, and it runs awesome.

Check Glenssextons post, what I am reffering to in his blowup diagram it the # 29 Pump plunger assembly..aka accelerator pump. The pump plunger forces a durational amount of gas down, through the carb and out of # 35 the pump jet housing. if they are blocked...your boggin and backfirin. This is one of the most common issues with edelbrock and carter carbs that noone knows about, good luck. By the way, # 20 is the pump arm, this controls the duration of the squirters via 3 holes in the linkage, the top hole for the shortest squirt, middle for medium, bottom for the longest gas blast...normal setup you would have your linkage arm, in the middle hole of the pump arm. Hope this helps.

Hey guys, the original post was back in April....Probably has it fixed by now.....