Tuning chart Edelbrock 1400

[elbpony]

Ladies and gents

First of all I love my truck. Since having it back from solving the darn break problem, I put around 100 km on it and found little reason for complaints. Nice drive and good feeling.

One is I need a new clutch rather soon.
Two is it bogs when cruising and stepping on the gas.

I started searching for the tuning chart but can't find it for the 1400. Only 1403 and up.

Anyone around who by chance has it? And probably right away the kit number with rods and springs?

Thanks
Tim

 

[Ricko1966]

How do you know the bog is due to incorrect carb setup. How is it timed?FWIW base timing is no longer accurate or best way to time this,use total around 36*. Tming chain stretch and a different carbureator,changes the equation. Do the centrifugal and vacuum advance both work? What condition are cap,wires,plugs,and rotor? What is the general condition of the engine,Vacuum and compression. Do you have any vacuum leaks. Not saying you don't need calibration work on the carbureator. But I also know a lot of carbureators get blamed for other problems.

 

[elbpony]

How do you the bog is due to incorrect carb setup. How is it timed?FWIW base timing is no longer accurate or best way to time this,use total around 36*. Tming chain stretch and a different carbureator,changes the equation. Do the centrifugal and vacuum advance both work? What condition are cap,wires,plugs,and rotor? What is the general condition of the engine,Vacuum and compression. Do you have any vacuum leaks. Not saying you don't need calibration work on the carbureator. But I also know a lot of carbureators get blamed for other problem

I know, thanks for the comprehensive list.
And knowing the chart will help me knowing the carb, too.

 

[Ricko1966]

I know, thanks for the comprehensive list.
And knowing the chart will help me knowing the carb, too.

https://www.edelbrock.com/pub/media/wysiwyg/documents/carb-owners-manual.pdf?srsltid=AfmBOoqnaWR4ieu-OlSYda0JvPwLWGNMKRHMo9e-1f2MlJNBpKpoZqOn

 

[Terlingueno]

It appears to me, a for real Edelbrock 1400 which has EGR function, has the same primary/secondary jets as a 1406 (.098-.095). The metering rods are #1456 (.073. x .047). The 1406 has metering rods #1459 (.075 x .047). So in my opinion, That being said, if all the stuff that Ricko mentioned is correct, and if you want to go the calibration route, an Edelbrock calibration kit for a 1406 would be the one to get and follow the calibration chart for a 1406.

 

[75gmck25]

As already mentioned, make sure your timing is correct first.

With the Edelbrock 1400 series of carburetors a part throttle bog may be due to two problems. Either the step-up springs are rated too low (e.g., 5" springs when 7" or 8" rating would be better), or incorrect settings for the accelerator pump and/or pump shot. Another possibility is that during initial setup of the throttle the transfer slot exposure is wrong. The slot should be approximately a square to provide the best transition from the idle circuit to the primaries. Set the slot exposure first (which also establishes the idle position for the linkage) and then use the mixture screws to get the best idle.

 

[elbpony]

Gentlemen I know that there are first things first. I don´t want to start calibrating first, I just start gathering information over all.
I am aware that there are many more vital things before finetuning.

And today I started working out all those details.

I started with checking the basic timing conditions.
Car was warm and sitting at idle. Idle is smooth and stable.
Unhooked the vacuum can from manifold vac port and plugged the port, timing is 16 degrees @ 750 rpm. Advance increases with rpm, yet I did not measure.
Oddly enough the rpm didn´t drop when I unplugged the line to the canister. Puzzled as I was, I hooked up my vacuum gauge to see how much vacuum the engines makes. No vacuum. No suction. There is no vacuum.

Could it be that the previous owner had a 2V carb on it, with the matching 2V manifold and when changing to edelbrock 1400 the manifold chosen was incorrect? Could that lead to a full vacuum missing on that port?
Nah I take that question back. W/o part numbers and a full picture nobody can answer or guesstimate that.
Oh what fun I see on the horizon waiting for me ...

 

[elbpony]

https://www.edelbrock.com/pub/media/wysiwyg/documents/carb-owners-manual.pdf?srsltid=AfmBOoqnaWR4ieu-OlSYda0JvPwLWGNMKRHMo9e-1f2MlJNBpKpoZqOn

thanks, found that and have that already, and it does not read details for the 1400. That´s why I kept on looking and finally asking here

 

[elbpony]

As already mentioned, make sure your timing is correct first.

With the Edelbrock 1400 series of carburetors a part throttle bog may be due to two problems. Either the step-up springs are rated too low (e.g., 5" springs when 7" or 8" rating would be better), or incorrect settings for the accelerator pump and/or pump shot. Another possibility is that during initial setup of the throttle the transfer slot exposure is wrong. The slot should be approximately a square to provide the best transition from the idle circuit to the primaries. Set the slot exposure first (which also establishes the idle position for the linkage) and then use the mixture screws to get the best idle.

perfect, thanks for explaininhg that.

 

[elbpony]

I read on a Corvette forum that the 1400, not 1400 series, has no full vac on the front side of the carb. It is all ported. All the 14 series has full on the driver side and ported on the passenger side.
All but the 1400.
Can anyone confirm that?

 

[elbpony]

Sorry to flood you further, I had time for more trial and error.

Here what I found

The driver side port is timed. With throttle open, there iis vacuum.
I measured 6mhg @2000 rpm. Betwern idle and approx 1/3 throttle the gauge reads nothing. Suddenly the needle jumpes to 6 andvthat kind of corelates with 2000rpm. Does that tell anything to you specialists?

Regarding ignition adcance, Vac can unplugged, engine warm i measured
850 rpm idle 16 deg btdc
2000 rpm 26 deg btdc

I also saw that the timing shortly went 4-6 degrees after tdc, retarded timing. Only half a second or so, and then went back to normal betwern 16 and 26. Depending on rpm

Higher as 2000rpm i could not check as the mark became invisible. Literally, the mark wasn't there anymore.

 

[Ricko1966]

Because the 1400 is a 50 states emissions legal replacement carbureator. I would bet there are no published modifications from edelbrock for the 1400. Modifying it would null its certification. I would use the chart for a 1406 and some common sense if I wanted to modify things.

 

[elbpony]

Because the 1400 is a 50 states emisdions legal replacement carbureator. I would bet there are no published modifications from edelbrock for the 1400. Modifying it would null its certification. I would use the chart for a 1406 and some common sense if I wanted to modify things.

I'll probably get other equipment on it. I want the full vac for timing and the manifold looks spooky, too

 

[Sad Sack]

FYI Only:

 

[elbpony]

FYI Only:

Goober, thanks.
Interesting, the manual states the driver side port is manifold vac. At least mine is not, but ported or sort of ported.

Is there any chance a manifold vac port can get stuck or clogged that is lets vacuum pass on certain circumstances?