>> I am sure we've both seen some pretty "square" camshafts but everytime I >> think about the roller tappet stuff, I recall the cam and tappets in the >> Nash Ambassador big 6 engine used from '49 to the end of Nash.
>> and despite the single barreled carb >> and that covered ditch in the head casting capable of being uncovered and >> suitably polished, My folks had a 1952 Golden Anniversary edition Nash Ambassador with the special metallic gold and dark red paint. The single side draft carb was a PITA. If the car was parked anywhere with any tilt toward the left, it was very hard to start because the gasoline would run out of the carb instead of into the intake. I'd like to take one of those engines, CNC mill out the intake channel, just enough to smooth it. Polish the ports too. Then mill a new cover plate with injector bungs and convert the carb to a dry throttle body. No more problems with fuel going the wrong way before it fires up. Was there ever a dual carb version of the big overhead valve Nash straight 6? Those engines are insanely heavy, much more massive than any common American 1960's and later V8. Much of the fuel efficiency came from the optional overdrive on the manual 3-speed transmission. There's a thing I'd like to figure out how to rebuild, the planet gear carrier in that Borg Warner overdrive. Either the needle bearings wear or the gear bores do. Things get sloppy and pressure on the gears increases. That causes heating, making the ring gear expand until it seizes in the overdrive housing. *BANG* Car comes to a quick halt! The problem with fixing those is the pins the planet gears spin on are welded into the carrier, then an oil pickup/distribution ring is crimped on. That's there to use centrifugal force to push gear oil into the planet gear needle bearings. Of course the welds are under that crimped on ring. The ring would pretty much have to be destroyed to get it off so the welds could be milled through. Sooo, design and machine new dies to stamp new oil rings, and more dies to crim the new rings on. Also design and build a fixture to hold the planet carrier to mill out the welds on the pins. Then there's the wear problems. If the gears and pins are OK, drop in new pins of stock diameter. If the pins are worn, replace with new ones hard enough for high pressure roller bearing use. If the gear bores are worn, grind or hone straight and concentric to a suitable diameter for use with a larger stock diameter of needle bearing rollers. Then there's accommodating all the slightly different output shafts and other variances the various vehicle manufacturers had Borg Warner make on that part. There would be good money in it for someone who can do all that to rebuild those overdrive planet gears. Nobody is making any more new ones. I'm not going to do it, I don't have a need for a rebuilt one. When my folks' Nash overdrive did that we happened to have a Nash transmission someone had attempted to rebuild (probably back in the 60's) but couldn't get put back together. In the box of parts was a brand new planet gear assembly. Swapped that into the 52 and it was a new overdrive. That failed transmission rebuild yielded up another useful part when I was fixing a transmission in a 1984 Ford 1/2 ton pickup. It needed a brass syncro ring and the old 1950's syncro rings were the exact same part. Instead of a week waiting on a new part, I had it done in a couple of days. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
