September 2014

50 Years of Chevelle!

colin-head-shotBy Colin Date

As most of you good folks have probably surmised by now, I’m pretty much an all Chevy models car guy. Corvette, Camaro, Chevelle, El Camino, Tri-5, Impala, Nova, etc., I’m smitten by them all. Chevelles are right up there at the top of my all-time favorites chart– a Bowtie model I’ve gushed over since I was about 10 years old. I’ve driven them, wrenched on them, photographed and written about them, but, alas, have not yet actually owned one. Continue reading

Braking System Basics: Master cylinder and power booster conversion

master-cylinderStory and photography by Colin Date

Performance gains: A new, dual circuit master cylinder and power booster will enhance the ease and safe operation of your brake system.

Most vehicles on the road today, both old and new, use hydraulic systems to actuate the brakes. Hydraulic systems allow pressure to be delivered through small diameter hoses and lines from the pedal to the braking surfaces at each wheel without taking up a large amount of room. They also decrease the amount of foot pressure required by making the surface area of the master cylinder pistons smaller than that of the wheel cylinder or caliper pistons.

The master cylinder consists of a fluid reservoir mated to a cylinder and piston assembly. Late models (typically post-1967) came equipped with a dual reservoir master cylinder. The dual reservoir was designed to separate the front and rear braking systems hydraulically in case of a leak. These dual circuit master cylinders utilize two pistons, a primary and a secondary, to keep the braking system safely in order. The primary piston is actuated mechanically by the linkage of the brake pedal. The secondary piston, located directly behind the primary, is set in motion by trapped fluid between the two pistons. If a leak occurs forward of the secondary piston, it will move forward to the front of the master cylinder, and the trapped fluid between the two pistons will operate the rear brakes. If the rear brakes develop a leak, the primary piston advances until it reaches the secondary– forcing it to apply pressure to the front brakes.

Click Here For This Month’s Tech Article

You Will Need Adobe Acrobat Reader to View this PDF

The Replacement

Coggin-chevelleRon Coggin’s ’67 Chevelle SS 396 set aside his Model A Ford world

Owned by Ron and Ellen Coggin, Jacksonville, FL

Story by Ellen Coggin   Photography by Colin Date

After Ron Coggin served in the USMC and did a tour in Viet Nam, his dad promised to match his savings. That’s how it all started.

After discharge in 1968, Ron stopped in Macon, Georgia to collect on the promise. He and his Dad visited several dealerships when Ron fell for a ’67 “Tahoe Turquoise” Chevelle 396 SS– bench seat and a 4-speed It was perfect! But four years later back in Jacksonville, Florida, economics, marriage and a new baby meant selling it to a co-worker. When last spotted, Ron noticed hunting dogs in the back seat! Ron just cringed and swore he’d own another one, someday… Continue reading