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| Re: Retirement Plans for R44/46? (50150) | |||
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Re: Retirement Plans for R44/46? |
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Posted by Metal Management INC on Sat Feb 12 23:33:12 2005, in response to Re: Retirement Plans for R44/46?, posted by Chris R16/R2730 on Thu Feb 10 17:25:22 2005. Remember Chris Car inspectors and managers don't utilize the performance of brakes. They just get them "working as designed". I accept the statement the R68A brake suck because of various factors not found on schematics and I am quoting as one who used them day to day, rather than sheer perceived genious based on MDBF .1) The length of time the SAP equalizes end to end in agreement with the brake valve is excessive. Patience is a virtue in handling them. When yanking the valve to 30 or 40 Pounds and noting decelleration that feels like 10, it ususally causes alarm and subsequent fanning of the brake valve. NYAB is instantaneous. The SAP needle rises then stops quickly and the consist brakes together, rather than the front first then the rear catching on. Its the big reason they aren't mixed carrying passengers. I had one that was. The dynamic was loading hard while it took a few extra seconds for the rear four cars to equalize. I took it to the yard none the less. I'm convinced it is by design. The Kawasaki R62s also display this charactoristic although not as bad as the R68A but I never had to worry about sliding out of a station with NYABs 2) A & R Magnet valves. I noticed early on when new the NYABS released several seconds earlier than WABCOS. They still do it even though the NYAB brake valves were replaced with the WABCOs. Could be they are ported differently, have bigger exhausts or even lack screen filters or chokes. Either way when I think I have a poor braking train, and didn't wait for the air to build up to the rear, I'm overapplying, then when the train does do what the valve says it should, I have to release and do it again. I never did that on inshot air. MDBF? mad dash before food. Lets hear from "The Hack" |
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