Six helpful tips on four-barrel carburetor tuning

by App Studios | Mar 30, 2014 | Carburetors, Tech How-To | 2 comments

1.) How do I select the right size of carburetor?  Carburetor performance is largely based on the air-speed traveling though its venturis. If they are too big the air speed will be reduced, too small and vice-versa. Probably the best instruction on carburetor choice...

Arch rule of carburetor tuning: Ignition first

by App Studios | Sep 12, 2013 | Carburetors, Tech How-To | 0 comments

By Sam Logan. Photographs by Moore Good Ink:  Download text and hi-res images here. The cardinal rule of carburetor tuning is Ignition First. Once the static ignition setting and the ignition advancing mechanism in the distributor is correct, the air-fuel mixture can...

Demon wants to tell you how to tune carburetors—in minutes!

by App Studios | Jul 12, 2013 | Carburetors, Tech How-To | 40 comments

Text by Sam Logan. Pictures by Moore Good Ink. Engines produce vacuum, and over the past 130 years engineers have contrived ingenious ways to advance the carburetor’s powers to match engine developments. Aided by barometric pressure, ignition and compression,...

Evil twins: first twin 625 Street Demon carbies on the first new 409 hotrod engine

by App Studios | Apr 12, 2013 | Carburetors, Tech How-To | 0 comments

Text by Sam Logan. Photography by Moore Good Ink. Download text and Hi-res images. In the dyno room, Lamar Walden’s first production road-going 409 fitted with twin 625 Street Demon carburetors revved with enthusiasm to 6,293rpm and generated 602.4 peak horsepower and...

Installing a new Street Demon

by App Studios | Dec 17, 2012 | Carburetors, Tech How-To | 0 comments

By Sam Logan. Photos by Moore Good Ink. Download text and hi-res images 1 of 2. Download text and hi-res images 2 of 2. Before the new Street Demons were first released to the public on Friday, May 25, 2012, the carburetor company dispatched twenty to thirty...

More handy tuning tips for modular carburetors: Part 2

by App Studios | Dec 14, 2012 | Carburetors, Tech How-To | 0 comments

  Part 2 of 2: By Sam Logan. Download hi-res images and text here. If you ever have the chance to discuss engine tuning troubles with the legendary Jon Kaase, you’ll rejoice in his simple logic. “Most engine troubles,” declares Kaase, “are centered on spark or...