By registering with us, you'll be able to discuss, share and private message with other members of our community.
SignUp Now!I won't hold my breath. I'm wondering how Kirban's supplier is going to rebuild em. Without the correct Teves tooling, how will their supplier accomplish something that hasn't been tried since PM has been manufactured. If a supplier can rebuild em, how come rebuilt units haven't been around since GM stopped production.Wells said:Kirban's is going to have out rebuilt bowls before too long.
Maybe part of the reason the GM is teetering on the edge of bankruptcy? There's two or three things involved, one of them being the gas laws, ie, PV=RT. The PM was DESIGNED for the pressures specified in the shop manual, which are less than 735 psi. The designers worked for Moraine, maybe had a different background than the guys at Buick. The anti-lock brakes had a different master cylinder, much smaller bore. If you pressurized our brakes with 2500 psi, they would lock, real quick, if nothing failed from overpressure. The high pressure accumlator on the antilock brakes ran from about 1000 psi up to 2500, which is a pressure ratio of 2.5 to 1. The PM ran from about 500 to about 700, which is a ratio of only 1.4 to 1. That means that the antilock brakes had more available volume, from min pressure to max pressure, in addition to having a smaller master cylinder, which uses less fluid. More volume, less fluid, means more pedal strokes available. Now, it's possible that the accumulators were designed for the high pressure, even for the PM, but if so, that was a big waste of material. (remember bankruptcy?) Anyway, while it's possible that the higher pressure accumulator can be made to work, it just seems like everything keeps pushing toward vacuum brakes.GM engineer and according to him, an accumultor ball is an accumulator ball
TURBO2 said:If you still need a replacement Accumulator go to http://www.CVJEnterprises.com
All new RECHARGEABLE Accumulators.
gofstbuick said:The Teves3 and later is antilock. The working pressure is 2000psi to 2700psi. I've already had conversation with a GM engineer and according to him, an accumultor ball is an accumulator ball. The ball is split into two diaphrams and the back half is filled with compress nitrogen. The motor applies pressure to the accumulator and the pressure is retained by a check valve on the master cylinder. When you press on the brake pedal, pressure is released from the accumulator ball and you have power assist. Working pressures for powermaster is around 635psi to 800psi. I suspect that our system could retain 2700psi and if it did, you would get around 10 pedal pushes if the motor pressurized and then completly shut down. Because PM working pressure is 635, you get 2 pedal pushes before the motor re-energizes the accumulator. Remember that antilock relies on pulsing the brakes to keep the wheels from locking, hence the increased accumulator pressure reserve. The only thing keeping us from increasing working pressure is the pressure switch. I suspect the motor would accomodate 2700 psi, but that may be a question for Hank Terry. If not, a newer Teves E-H motor should accomplish the task.