Amazing Fuel Delivery for our Salt Torpedo
Editor’s Note: This article was published in Easyriders in 1995, but it’s still applicable today. At the time it covered the new Carl Morrow Typhoon billet Carburetor. Since then there has been some tweaking and Carl installed a Thunderjet on this Typhoon for the 5-Ball Racing Salt Torpedo we are building with a 135-inch JIMS twin cam and a JIMS heavy-duty 5-speed transmission.
Here’s the ThunderJet description from Zipper’s:
ThunderJet is a jet-able, externally mounted third fuel circuit that improves the performance of 2-circuit carbs such as the S&S Super. Unmodified, these carbs typically have a low speed, or intermediate, circuit that supplies fuel from idle to approximately 2500 rpm, at which point the carbs’ main jet circuit becomes active, delivering more fuel to the engine. These two circuits must then supply fuel for the rest of the rpm range.
The problem is: the remaining rpm range is too wide (typically 2500-6500 rpm) for only 2 circuits to handle efficiently. The tuner generally encounters problems jetting the carb to give good, crisp mid-range response and still have strong topend power. A compromise is the result. Back the main jet down, carburetion in the mid-range is good but top-end is lacking. Increase the main, top-end improves but now the mid-range is rich; flat spots or hesitation is encountered. The answer? ThunderJet from Zipper’s Performance!
Here’s the Typhoon Article from 1995:
Carl Morrow of Carl’s Speed Shop, previously located in Santa Fe Springs, California, had two missions in life. The first was to find ways to make Harley’s go faster, and put his riding son, Doug, in as many record books as possible. The second was to get the hell out of California! So, he’s moved his entire family (they all work with him in his shop) to the seaside community of Daytona Beach, Florida. Carl’s new shop was under construction during the 1995 Octoberfest; he’s opening for business in January. By the time of Daytona Bike Week 1996, his shop, located at 390 North Beach Street (a couple of blocks north of Daytona Harley) will be in full swing.
Read more here
