We took the The Green Machine to its first autox event, it ran 399 laps before breaking the Auburn Hi-Performance series differential. The new Pro Series should survive the next experiment at Pittsburgh International next month.
Our 79 Monte Carlo- Pro Touring Project
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What broke in the Auburn?, if I was a betting man I'd say the pinion gears cause they are the small side in a posi...
Do I see rear disc brakes on the car now? Was there a writeup on that conversion in this thread?
pontiacgp said:
The ring and pinion were fine. The spider gears (I think is what they're called) on the drive pin broke. Basically we were zinging the inside tire enough to wear the friction material off the cones. When it went metal-on-metal, it locked.
UMI Sales said:
those are the pinion gears sitting on the pinion shaft. The spider gears are made up of the two pinion gears and two side gears. I don't know why they call them the pinion gears which is confusing with the pinion and crown gear...
Pinion gear it is then. Whatever the small gears are, now they aren't...
Our rear discs are a bolt-on Speedway Motors setup using Metric calipers. They aren't optimal, as the rear piston size is on the large side. I have it throttled down to fix the balance. We are looking at installing a Cadillac CTS caliper in the near future. Kind of just playing around.
Our rear discs are a bolt-on Speedway Motors setup using Metric calipers. They aren't optimal, as the rear piston size is on the large side. I have it throttled down to fix the balance. We are looking at installing a Cadillac CTS caliper in the near future. Kind of just playing around.
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More info on this brake conversion please. Is there any problems with using the stock G-body master cylinder, proportioning valve parking brake cables, Or having to have the axles machined to fit in the rotors ?UMI Sales said:
UMI Sales said:
They aren't optimal, as the rear piston size is on the large side. I have it throttled down to fix the balance ???
tc1959 said:
When using a single bore master cylinder (i.e. a stock one) the line pressure is equal front to rear. The Corvette calipers have 4 sq inch piston area. The metric rear calipers have slightly less than 4 sq inch piston area. What we need is a small enough piston (or piston(s)) out back to achieve roughly 50% the area of the front brake.
Most high end kits such as Baer, Wilwood, Brembo, use this ratio in single bore applications.
We installed a proportioning valve to reduce the rear line pressure and make the brakes usable. This isn't optimum however as the pedal doesn't get as hard and responsive as it does with the proper piston area due to the large volume of fluid in the rear calipers.
Like this:
http://www.speedwaymotors.com/GM-75-Inc ... 14021.html
We used this as a temporary and experimental solution to get rear discs on the car. We also learn from this stuff. With the front brakes being Corvette (calipers made by PBR) our rep at Baer knew of the Cadillac caliper with the proper piston area. When we try the CTS calipers (and we kind of already know they'll work great based on Baer's research) we can build front and rear brackets in-house and make our own bolt-on kit...
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