Re: 55 Packard Transmission Cooler Mockup ?
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Randy old friend, I enjoyed your dissertation but what you fail to realize is that, logic, common sense, and facts are, to some, not relevant when forming a position.
Also, what seems missing in this discussion is appreciation for the fact that hydraulically actuated apparatus like a transmission are regulated by pressure which is a function of viscosity, which is a function of temperature. Now no one wants an overheated transmission, but the Packard factory unit was (presumeably) designed to keep the fluid within a certain temperature range which provided the viscosity which then established spring pressures, orifices, etc. So you could speculate that a radiator-mounted cooler, driving across Dave Kenney's country in February into a freezing wind, would result in viscosities and hence pressures outside of the engineering design parameters. Also I wonder how well a radiator-mounted cooler does crawling along in a July 4th parade on a 110 degree day when there is little to no air flow across it? I'm beginning to think that, if you must have an radiator-mounted air cooler, perhaps having it in series with the original as you have done may be the best answer.
Posted on: 2009/12/13 13:40
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Re: 55 Packard Transmission Cooler Mockup ?
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Randy And O-D, Those are both very good postings. The way I understand the purpose of the OE fluid to fluid heat transfer coolers is that they are intended to keep the transmission oil in an ideal temperature range and not simply to cool the oil otherwise cars would have been designed that way. It is possible and even likely that an auxiliary cooler will overcool transmission oil if the ambient temperature is low. The tranmission shop technicians I deal with recommend that an auxiliary cooler be covered or disconnected in winter to allow the transmission oil to warm up along with the engine. As has already been noted the ideal method to install an auxiliary cooler if one is needed is to place it in series with the rad cooler/warmer.
Posted on: 2009/12/13 14:13
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Dave |
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Re: 55 Packard Transmission Cooler Mockup ?
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Thanks Dave, Randy and I both appreciate your comment and thoughts. Another issue to think about along the lines you mention is that excessively cooled fluid will resist flow more which could have a detrmental affect on lubrication efficiency, so in the end it's all a balancing act. I think you hit it right on the head, the OE can maintain a range, heating when (and if?) necessary, which an air cooler cannot. How relevant that is has yet to be determined, at least to me.
I have a thermocouple which I'm thinking about feeding thru the fresh air vent and down the trans dip stick tube into the pan, and setting up a recorder on the front seat to get some actual data. I'm running just a radiator-mounted cooler on the basis of a recommendation of my TU rebuilder, but there are many other 56s running around the neighborhood with the original cooler so that it should be easy to get some hard comparative data, though it will take some time to collect the data from both cars under similar operating conditions.
Posted on: 2009/12/13 14:27
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Re: 55 Packard Transmission Cooler Mockup ?
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Forum Ambassador
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Dave, You are welcome. I am sure we would all be very interested in the results of your study. Would one of those laser thermometers be of assistance by simply measuring temperatures on the bottom of the trans oil pan and comparing the readings to a OE equipped Packard without the auxiliary cooler? I have one and it is quite accurate and you might get your readings without jacking up the car.
Posted on: 2009/12/13 14:42
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Dave |
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Re: 55 Packard Transmission Cooler Mockup ?
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Brian,
To answer your question about the transcooler construction, the two halves are stamped steel, and appear to be crimped, and then sweated together. Internally the cooler has a metal hardline tubbing that is coiled in a elongated oval to give as much transfer surface as possible. In '54 in there were at least 2 versions of this cooler. One for the normal passengers cars, and then a "Heavy" duty version which I imagine was for the Commercial Chassis. The difference is the diameter of the tubing and larger trans line fittings. When I replaced mine with a NOS unit, I also replace all the trans lines. But I put in a small 5 inch long spliced-in section in one line towards the front. So in the future I could easily remove the spliced section and attach a aux cooler in line without have to cut into the hard line. As stated by others, the OEM cooler tended to rust at the water hose connections. Sweating brass ends on would be an improvement. On the NOS unit I acquired, I repainted it in the Eastwood Chassis black, and also painted the inside of the hose connectors to hopefully ward off rust a little longer.
Posted on: 2009/12/13 14:52
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: 55 Packard Transmission Cooler Mockup ?
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Also I agree the fluid transfer design is not unique. Almost every car produced in the last 40 years with an automatic transmission has had the transcooler in the bottom of the radiator. I haven't seen anything in the news recently about a massive recalls do to chronic coolant/trans fluid leakage.
I think if a part starts to fail after 50 years, then it was a pretty well designed part. I cant think of many things on a new car that would last 50 years without replacement. Just my $.02
Posted on: 2009/12/13 14:57
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: 55 Packard Transmission Cooler Mockup ?
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Home away from home
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I have a bourdon tube type water temp gauge. Anyone see any reason why i couldn't just drop the end of the bourdon tube down the 56 dip stick tube to get some readings????
I usualy don't like electric gauges. But maybe the electric gauge sending unit could be adapted to the T'Ultra drain plug????
Posted on: 2009/12/13 15:19
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: 55 Packard Transmission Cooler Mockup ?
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Forum Ambassador
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I installed a VDO oil temperature gauge on the oil pan of my 83 Volvo. I drilled and tapped the oil drain plug for the sender unit and it works fine. I imagine that a similar gauge would work on an auto trans such as a T/U.
Posted on: 2009/12/13 15:29
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Dave |
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Re: 55 Packard Transmission Cooler Mockup ?
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Wouldn't you want to measure the trans fluid temp before it gets to the cooler and the not the colder pan temp? They don't measure engine temp at the bottom of the radiator for example.
Posted on: 2009/12/13 15:32
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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