Looking to build a light farm N/A diesel 5500 to 7500 lbs. Only real rules is tractor has to be under 75 hp stock and have the same number of cylinders as stock .
Kicking around the idea of 8.3 cummins 88 Oliver Dt 466 in 560 .Thanks for any help and ideas
It's my understanding that it's called a blower because it forces the exhaust out instead of building boost. There are no intake valves in those, just holes along the bottom part of the liner. Once the piston passes those holes, air is allowed in the cylinder. Since there is a very short window for the air to enter, a blower is needed to get enough air into the engine for it to run. Instead of a full stroke to suck in air like a tradtional 4 stroke, engine, the 3-71 and 4-53 engines only have as much time as the piston is below those intake holes.
They definitely require a different driving style, since they have a very narrow torque curve. Once they drop 100-300 RPM, they fall clear to the basement.
2 stroke detroits need a blower to scavenge exhaust. In an effort to help with torque GM put a turbo on top of some of the blowers. GM coined the term "Supercharged" system which was a combination of turbo pushing blower. Not sure about rule interpretation but a Blower forces air into an engine plain and simple.
If the rule was left open, someone could theoretically overdrive a 14-71 blower on a 4-71 engine and increase airflow drastically. Or use a more efficient Whipple charger, etc.
They fall right off because blowers are mechanically operated and when engine rpms decrease as will blower speed therefore boost, with turbo heat from exhaust is a factor so when in a lugging situation the engine making more heat/pressure still spinning turbo.
From GM:
The Roots blower is commonly used on the two stroke diesel engine, which requires some form of forced induction. In this application, the blower does not provide significant boost and these engines are considered naturally aspirated with the blower providing just slightly more than positive pressure as the device is acting as a positive displacement pump; turbochargers are generally used when significant boost is needed. In small engines, a conventional turbo will be followed by the blower.
All in all, seems like blower on 2 strokes is an advantages N/A would not be able to take advantage of.
