1967 Chevy Camaro Project - The Unfair Advantage, Part 2

Prodigy Customs Sets The Engine Back And Customizes The Firewall On Its 200 Mph Street Camaro.

Frank Serafine Sep 1, 2010 0 Comment(s)

Before going into the calculation of what moving the engine 8 inches will do to the weight bias of Unfair, let's quickly recap where we are with the car's weight:

Stock: 1,900 front/1,500 rear/3,400 total
56/44 front-to-rear weight bias

With a weight loss of 75 pounds for the engine and 90 pounds for aluminum sheetmetal before we move any weight (assuming 80 percent of the weight savings comes off the front, and 20 percent from the back)

1,900-0.8*165 pounds front, 1,500-0.2*165 pounds rear
1,768 front/1,467 rear/3,235 total
Putting us now at 54.5/45.5

In order to drop the engine, we have to go back 8 inches before going down because we have to get the engine behind the Tony Woodward rack in order to lower it. Making these changes was a last resort solution: We didn't want to have to do this.

Hopefully the use of a hardware store wheelbarrow is a trick you can apply to your own projects should you decide to grab your torch and welder and make a similar fix.

The math shows a significant gain in the weight bias front to rear. The mass of the engine/transmission is now completely between the axle centerlines (a factory Camaro has the number one spark plug even with the front axle). Let's assume that the car started out as 54.5 percent of the weight on the front tires, the engine/clutch/tranny combination weighs 800 pounds, and that the car will weigh about 3,000 pounds empty and 3,200 pounds with driver. We are moving the engine 8 inches and our wheelbase is 108 inches.

The approximate effect per axle can be calculated using the following equation:

Wb = (Mm/WB)*(M/TW)
Wb = change in weight bias
Mm = movement of mass (the engine/transmission) in inches
WB = wheelbase
M = weight of mass
TW = total mass of car

Plugging in, we get Wb = (8/108)*(800/3000) = 0.0197, then multiplying by 100 to get percentage gives us 2 percent.

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