Blowers
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Here's a neat animation showing a straight-on view of the rotors in a 3-lobe Roots. Air entering is in blue and air exiting is in red................................................................... | Here's a neat animation showing a straight-on view of the rotors in a 3-lobe Roots. Air entering is in blue and air exiting is in red................................................................... | ||
http://www.mekanizmalar.com/roots3.html............................................................. | http://www.mekanizmalar.com/roots3.html............................................................. | ||
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The Roots types we are most familiar with came as original equipment on GMC two-stroke diesel engines. The number of cylinders and the cubic inches per cylinder is the way the engines were designated, so the blowers just naturally were called by the same designation. For instance, a 4-71 blower would have come off a 4 cylinder inline motor with 71 cubic inches per cylinder for a total displacement of 284. This blower would be a good choice for a motor of around 300 cubic inches and could be overdriven (by juggling drive and driven pullies) to feed a larger motor or underdriven to feed a smaller motor. Here are some of the GMC motors I could find..... | The Roots types we are most familiar with came as original equipment on GMC two-stroke diesel engines. The number of cylinders and the cubic inches per cylinder is the way the engines were designated, so the blowers just naturally were called by the same designation. For instance, a 4-71 blower would have come off a 4 cylinder inline motor with 71 cubic inches per cylinder for a total displacement of 284. This blower would be a good choice for a motor of around 300 cubic inches and could be overdriven (by juggling drive and driven pullies) to feed a larger motor or underdriven to feed a smaller motor. Here are some of the GMC motors I could find..... | ||
2-53, 3-53, 4-53, 6V-53(V-configuration rather than inline), 8V-53, 12V-53, 2-71, 3-71, 4-71, 4Twin-71, 6-71, 6Twin-71, 6Quad-71, 8V-71, 12V-71, 12VTwin-71, 16V-71, 16VTwin-71, 6V-92, 8V-92, 12V-92, 16V-92, 6-110, 6Twin-110, 12V-149, 16V-149. Add to those....Turbo.....Turbo Intercooled.....Turbo Aftercooled.....Turbo Intercooled Aftercooled.....those are documented but may be a few others. Not certain if there was a 171, and there were some V71 Twins and Quads.. inline had High and Low blocks. There were also V-53 and 6-71 alloy block versions. | 2-53, 3-53, 4-53, 6V-53(V-configuration rather than inline), 8V-53, 12V-53, 2-71, 3-71, 4-71, 4Twin-71, 6-71, 6Twin-71, 6Quad-71, 8V-71, 12V-71, 12VTwin-71, 16V-71, 16VTwin-71, 6V-92, 8V-92, 12V-92, 16V-92, 6-110, 6Twin-110, 12V-149, 16V-149. Add to those....Turbo.....Turbo Intercooled.....Turbo Aftercooled.....Turbo Intercooled Aftercooled.....those are documented but may be a few others. Not certain if there was a 171, and there were some V71 Twins and Quads.. inline had High and Low blocks. There were also V-53 and 6-71 alloy block versions. | ||
| − | The most popular for hot rod use today would be the 4-71, 6-71 and 8V-71 (just called 8-71)units. There is some work to be done on a stock (fresh off the diesel)"Jimmy" blower that you maybe find at a swap meet or on ebay. The rear case cover bearing bosses need to be strengthened with steel collars and the rotors must be clearanced to the case interior. These and other mods will be addressed in Pat Ganahl's book. If you're considering a blower, it is well worth the investment to buy and read this book.....http://www.themotorbookstore.com/supercharging.html | + | The most popular for hot rod use today would be the 4-71, 6-71 and 8V-71 (just called 8-71) units. There is some work to be done on a stock (fresh off the diesel) "Jimmy" blower that you maybe find at a swap meet or on ebay. The rear case cover bearing bosses need to be strengthened with steel collars and the rotors must be clearanced to the case interior. These and other oiling mods or sealed bearings will be addressed in Pat Ganahl's book. If you're considering a blower, it is well worth the investment to buy and read this book.....http://www.themotorbookstore.com/supercharging.html |
I have no commercial arrangements with Pat and don't make a dime off him selling you his book, I just like the way he writes. By the way, speaking of swap meet or ebay, did you know there is a small bore and a large bore 6-71? Click here and let Brother Vern lead you to an explanation of the differences.....http://www.fordflathead.com/blowersize.html | I have no commercial arrangements with Pat and don't make a dime off him selling you his book, I just like the way he writes. By the way, speaking of swap meet or ebay, did you know there is a small bore and a large bore 6-71? Click here and let Brother Vern lead you to an explanation of the differences.....http://www.fordflathead.com/blowersize.html | ||
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