EMPI EPC 34 carbs, Re jetting for a 1911 Options

[jsaum]

I have a 1.8 with the dual EMPI EPC 34's on it, they work great. I'm about to do a top end rebuild on the 1.8 and have the option to bump it up to a 1911. These little carbs are rated up to the 1.8, I'm thinking if I go to the 1911 I will need a little more out of the carbs. Has anyone gone to bigger jets successfully on these carbs? If yes how much bigger would I need to go? They come standard with 1.75 needle and seat, 150 main jet, 55 Idle jet, 175 air jet and F-6 Emulsion tube.

Thanks,

Jsaum

[jsaum]

I have a 1.8 with the dual EMPI EPC 34's on it, they work great. I'm about to do a top end rebuild on the 1.8 and have the option to bump it up to a 1911. These little carbs are rated up to the 1.8, I'm thinking if I go to the 1911 I will need a little more out of the carbs. Has anyone gone to bigger jets successfully on these carbs? If yes how much bigger would I need to go? They come standard with 1.75 needle and seat, 150 main jet, 55 Idle jet, 175 air jet and F-6 Emulsion tube.

Thanks,

Jsaum

I did some digging around on the web and I found this, so I guess the 34 epc will run the 1911 if I want it to run like a 1600 cc bug!

So, let's say that you have a 1915cc engine and you want to know VW used a 28mm venturie in a 34 pict (34mm throat) carb for a 1600 (1584cc) engine.
That means they accounted for the engine running fine with 56.57cc for every mm of venturie (1584 div by 28 = 56.57).
If that rule of thumb worked for many years for many cars, then the same rule of thumb COULD WORK for you.
what size throat carb you should use on it.
Here's the math for that situation: 1915 div by 56.57 = 33.85mm or a 34mm throat size carb.