Supercharger vs turbocharger

is there a website for this? i would like to know more.

also, here's what 2 turbo's and 6 cylinder's can do on my race car!


http://www.youtube.com/watch?v=kwqJOcRjM_4
http://www.youtube.com/watch?v=eZid2a_ZNtI

 

detroit used the mechanicaly driven supercharger on there 2 strokes because they had to the blower provides pressurized air to the cylinder to clear the spent combustion gases and then fill the cylinder for the compression stroke , no intake valves , 2 stroke engines must be pressurized by some thing to run. early cummins ran a few blowers but power was limited by the fixed nature of the blower 1800 rpm = a fixed number of cfm no matter what the load . turbo chargers on the other hand are heat recovery compressors , capturing the expansion of exhaust heat and transfering that energy into the compressor turbine creating boost. within a set of limits a turbo will produce boost according to load , the more excess air the cleaner and more efficient the engine should be . in the later detroits that had turbos the blower was bypassed after a certain amount of boost because it limited flow capacity.

 

I started at US 30 in 1963 when I was 14.. My neighbor owned a Dodge Dealership in Harvey Illinois and ran a 63 Dodge Ramcharger (Running Ram)each week. This was in the days of heavy factory sponsors. I was there when Art Arfons blew the timing shack back with the Green Monster, saw Karmazines (The Greek) break the 200 MPH record...A friend owned / raced the Chi Town Hustler for a couple seasons. I raced over the years a 62 dodge, 64 Dodge, 66 GTO, all stock, just for fun.Got drafted in 69 and when I came back US 30 was gone..Great memories and times.. BTW, the radio announcer who did that Sunday Sunday schtick died about 3 months ago I read.
Are you from that area? Me south side Chicago !!!

 

Detroit Diesel ran a Rootes supercharger that was originally designed for pumping air into underground mines.

If I remember correctly, for racing applications, their rotating lobes had to be high-speed balanced and cut for teflon inserts to increase their volumetric efficiency. The end support plates were drilled for better oiling and/or bigger bushings. I do remember seeing custom plates made for cage type roller bearings to replace the stock bushings altogether. The "modern" superchargers all use the same basic design.

As was said, DD used the volume per cyl plus the number of cylinders (8v-71 = 568 cu in) but the common name was the HP level (DD318 had 318 HP). These engines were nice and simple and you could (and many have) rebuilt em in your back yard or even roadside. They leaked oil from everywhere from the first day you fired em up.... because you always had positive pressure in the base. You just lived with it. Old joke was to tune up a DD you changed the oil on the outside of the block.

Man, the sound of a Deeetroit all wound out with straight pipes was something else. You could always tell a DD driver (you couldn't tell him much tho). He was the guy in the truckstop saying "Huh? What? What??"

 

Still some guys runnin' em too.

It's great when they add the turbo to the supercharger as well.

 

I think that was mainly in John Deere's. They were replacing Deere motors with Cummins motors...then Deere started putting Cummins in their big tractors not long after that...so goes the need.

 

ever heard of backpressure? turbos add a lot of it. when the engine is forcing the exhaust out of the cylinders, the turbo is restricting that process. Come on. do you really think anything is free?

Turbos are cheaper, anyhow. No belt or gears to break, nothing to break except a couple of bearings and the torpedo