Visit The Dirt Forum for More Information

Author Topic:   Question for kp or any carb guys
Donnie Ross
Member
posted February 18, 2004 06:31 PM
is it possible to convert an alcohol carb back to gas with metering block change? or would the bleed changes in the main body made for alky use make this impossible?


dirtbuster
Member
posted February 18, 2004 07:03 PM
It can be changed back but will require more than metering blocks.


KPLugnut
Member
posted February 18, 2004 08:49 PM
Dirtbuster is right. Metering blocks, air bleeds, squirters, booster feed channel sizes, needle/seats all need to be changed. And, of course, the jets themselves.
On some carbs, depending on the application, the whole accelerator pump system needs to be changed as well, since most alky carbs use 50cc pump systems, and in many cases (i.e., 4bbl gas) only a 30cc pump is needed.

Hope that helps, if ya need any more info just ask.

KP


Donnie Ross
Member
posted February 20, 2004 06:21 AM
am I right in assuming the air bleeds used for alky would cause a rich condition? probably smaller than gas? the booster feeds do you mean the passages in the boosters themselves or the channels feeding them in the main body?


KPLugnut
Member
posted February 20, 2004 07:14 AM
Yes, you are right about the air bleeds.
And yes, the passages in the boosters themselves (as well as many times the ID and OD of the booster design itself. The main body "passage" is actually the end of the booster itself, too. That end of the booster is flared with special tooling and is what keeps the boosters from falling out.
Usually, alky boosters have at least a .180" size. Gas doesn't need that much, of course.
So to get back to your real question, both idle and main air bleeds need to be changed when going back to gas. Typical size differences are on the order of .005"-.008" (ballpark, tho, since it depends on the carb in question).

Hope that helps.
KP


Donnie Ross
Member
posted February 22, 2004 08:18 AM
thanks for your help kp apreciate it,


Back to the Archives