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<x-charset iso-8859-1>Hello- > In their experiments they said that hydrocarbons carried and > mixed much better with oil so lubrication with standard dino based > was better. They also went on to say that the pump pressures could be > dropped 50 lbs to 75 lbs and cool down below freezing at the vent within > a few seconds. Well, maybe it will work, who knows. Just to play devil's advocate for a sec... the thing that bothers me is that if it really does work and it really is safe, why don't OEMs use it? > I can get my original Freon based R-12 for 3 dollars a can in Tijuana at my > local > NAPA or AUTOZONE, they are displayed in can pyramides on the > floor and is terribly illegal to pass it through the USA border, must be > filled on the Mexican side. :-) There's a shop in So. CA I've gotten some polishing and chrome plating done at. They polish in CA, but plate in Mexico. They're prices are unbeatable... > This intriged me so I decided to see if I can experiment too, You can say > I am an illegal type of guy that plays on the edge. Nah... > That forum did mention that the Sanden compressor 5 or 6 cylinder were > the best and did not suffer black death that is common with the cheaper > units especially the Ford units. These type of compressors like the > Sanden use teflon or some kind of plasitc or teflon seals and would break > down during overheating or slight lack of lub . If you install a low pressure switch, you shouldn't have a problem with lack of lubrication. The compressor should kick off before everything leaks out. > This would create a black > slidge > that would circulate inside the system, clog the filter and those problem > prone orifice tubes. This problem is more common to Fords than any > other system but a specialist will tell you that this is common in any > system > with the newer modern pumps, Sanden quality prevents this. I see... I always knew Sanden was the best, but didn't realize what not-the-best really does for you. <sigh> > I cannot install a Sanden on my bracket since it makes the pump mount low in > back of the fan shroud and out of the way. The bracket mounts on the > exhaust head bolts and the fan shroud. If I placed even the smallest > Sanden, I would have to place it too far out and cause me to modify > the air cond crank pully too, causing an additional side upper load to the > crank > because of the leverage. I don't think I'm picturing this correctly... I'm thinking of the VPC-style T3 brackets that mount the compressor on top of the fan shroud, necessitating the moving of the aircleaner a bit. Are these different? > If I modified the bracket to hold the Sanden > correctly then > I would have to remove the oil based air filter and put something of lesser > filtering quality. The Sanden would be nice though. I tried a > San Diego company that is dedicated on installing air conditioning to > Bugs and Karman Ghias to see if they can install an alternative pump > to my engine without modifying the filter, they could not. Do you know of > any > tiny 5 to 6 piston pumps out there ? The Sanden 507 has the same diameter but much shorter length than the 508... > The 5 piston probably uses the same energy to turn but it is much more > uniform using 5 smaller pistons in a rotary fashion, the one or two > banger (Techmesh or York ) place good pressure then let go, that is > why it is less efficient and less smooth. 5-pistons take less energy... hence the higher efficiency. 7-pistons are even better. Scrolls are even better still. I've seen the specs on each, and the single biggest jump in efficiency is from 2-piston to 5-piston. > Since I have a old fashion piston pump , I need to enhance the rest of the > system to comensate and even make it better to the higher pressure of > the R-134 system. It will kind of look stock when done. > > I will let you know how it goes. Cool! (sorry... bad pun... :-) Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.LNengineering.com ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe </x-charset>