It has been a long time since i have put anything on this site, and for this i am sorry, but i have been very busy. On the other hand, good psost man. Great history on the SC’s that are commonly used on the terminator, but im gonna be honest In saying that roots type SC such as the Eaton M112, which can be found on 03-04 in often called a blower as opposed to a compressor. This is because the blowers force the air (at a high velocity) around the supercharger case or housing, thus compressing the air. A twin screw is considered a compressor because it compresses the air at in between the male and female supercharger blades, which were specifically designed to have the correct amount of mass air flow and PSI through the outlet area of the compressor. Both have are reffered to differently because of the diffrent compression process that occurs.
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ORIGINAL: KnotBand
my only comment is about terminoligy.....the title says positive displacement and yet, you talk about rotary type compressors....
positive displacement usually refers to something of the piston type.....like your engine, or your shop compressor, or your home AC compressor......they rotary technology (screw and scroll type compressors) is more efficient, more reliable, and more versitile than positive displacement equipment and usually more expensive. Screw compressors are used a lot on large chillers for unloading and on large industrial air compressors for efficiency since compressed air is the most expensive utility...
just thought I would point that out....but as a disclaimer, I don't know anything about superchargers and this might be an industry standard term eventhough it would not be consistant with normal industrial terminology.
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NO it is wrong to correct him. Both an engine performing the perfect otto cycle, and the supercharger are indeed both positive displacement. Yes it is more common to refer to the rotary style pump (twin screw and roots superchargers) than the reciprocating pumps as positive displacement, but they are both indeed positive displacement pumps, and yes the superchargers are more efficient, more reliable, and more versitle than than most common air compressors, and even most gas motors (if you dont take into account the ignition of the A/F mixture), thus the price of these supercargers. Chillers often do indeed use screw compressors, which are still of positive displacement and yes i do agree that they are expensive, but the main power sorce of air and electric is coal.