farmer boy
Well-known Member
I get the idea behind a turbo and how they work, but, what makes a turbo spool up as the load on the engine increases?
- Thread starter farmer boy
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2cylpartsinfo
Member
A turbo is simply two "fans" mounted on opposite ends of a common shaft. One is driven by exhaust gasses coming from the engine. The other "fan" (commonly known as the compressor wheel) is on the intake side compressing intake air in the engine cylinger allowing more air and subsequently more fuel to be injected, as a result more power is produced.
In other words, you get more power out of the same size engine by adding a turbocharger.
In other words, you get more power out of the same size engine by adding a turbocharger.
Janicholson
Well-known Member
A turbo is driven by either exhaust gasses, or by gears from the crankshaft.
THe exhaust driven type (by far most common) increases speed due to increased flow of the volume and temperature of the exhaust gasses. The more speed, (or open throttle) the faster the turbo operates.
a gear driven type (often used on WW2 piston engine airplanes) speeds up only when the engine RPM increases. The advantage of the gear drive is more instant power because it is operating independently of throttle setting, and may be up to speed already.
THe advantage of the exhaust driven setup is using waste heat and energy to cram more fuel and air into the engine.
Both can reduce a standard engine to molten globs in a few seconds if not controlled by pressure limitatio (waste gates). low compression design of the Turboed engine can allow it to be crammed even more full of combustable mix due to the larger combustion chamber.
Best practices require: Heavier main and block design, stronger bearings, forged cranks, high alloy rods, forged pistons, Oring head sealing systems, and far better cooling. Jim
THe exhaust driven type (by far most common) increases speed due to increased flow of the volume and temperature of the exhaust gasses. The more speed, (or open throttle) the faster the turbo operates.
a gear driven type (often used on WW2 piston engine airplanes) speeds up only when the engine RPM increases. The advantage of the gear drive is more instant power because it is operating independently of throttle setting, and may be up to speed already.
THe advantage of the exhaust driven setup is using waste heat and energy to cram more fuel and air into the engine.
Both can reduce a standard engine to molten globs in a few seconds if not controlled by pressure limitatio (waste gates). low compression design of the Turboed engine can allow it to be crammed even more full of combustable mix due to the larger combustion chamber.
Best practices require: Heavier main and block design, stronger bearings, forged cranks, high alloy rods, forged pistons, Oring head sealing systems, and far better cooling. Jim
Im trying to reword his post in the best way I can. I think hes asking, Why when you rev the engine does the turbo not spool but when you apply a load to an engine does the turbo spool.
I know what you are talking about exactly, On my modified turbo VW the turbo will not spool by just reving the engine, you need to be in gear with some sort of load on the engine to have it make boost.
I know what you are talking about exactly, On my modified turbo VW the turbo will not spool by just reving the engine, you need to be in gear with some sort of load on the engine to have it make boost.
As you load the engine, more fuel is being injected, and the combustion of fuel is simply a chemical reaction turning those molecules in the fuel into gasses. Thus, more fuel equals more gas, which then means you have faster flow/more exhaust pressure driving the turbo exhaust turbine, which increases the flow of air further into the combustion chamber to support the added fuel. There's also wastegates and variable geometry turbo chargers that have mechanical parts that vary boost, but for a fixed turbo, like the ones seen on older tractors, it's simply controlled by the fuel being burned and the boost pressure that is being built by the turbo (so in a way, it is somewhat self feedback). Hope that makes some sense.
Hurst
Hurst
Kent Petersen
Well-known Member
Let me see if i can explain a little better frist off a gear drinen unit is not a turbo it is commenly called a blower many on found the old detroit diesels they were call a roots type blower in the case of the turbo lets look at a commonblower that does not have any elec controls or other type it does spool up when the engine speed is inceased but not very much the hot ex gas expand as they leave the engine this spins the turbo faster as more load is applyed the turbo spins even faster they can rich speeds of 70000to 90000 RPM on a lot of diferant engines
farmer boy
Well-known Member
That's exactly what I'm trying to ask. Noticed it when hauling beans from the field. (extra time to think) As you begin up a hill, you can hear the turbo spool up. How does the turbo( or the engine) know that it has more load and what about it makes the turbo spool up.
Indiana Ken
Well-known Member
To simply "rev up" an engine without load requires very little throttle opening (gasoline engine) or in the case of a diesel very little increase in fuel flow over idle conditions. The turbocharger exhaust turbine is driven by hot exhaust gases and simply reving an engine without load does not significantly increase the temperature or volume of the exhaust gas stream.
Conversely placing an engine under load requires greatly increased fuel flow to maintain engine RPM. This increased fuel flow increases the exhaust gas temperature and volume causing the turbo to spool up.
Anonymous-0
Well-known Member
The governor in the injection pump senses a drop in rpm and makes the pump deliver more fuel to maintain the desired rpm setting, the turbo knows nothing more than the flow coming into it
Go with hauling beans up the hill and YOU HEAR THE TURBO SPOOL UP, going up the hill the tractor wanted to slow down the governer opened the engine throttle trying to keep engine speed (RPMs) the same, More throttle= more fuel and or air going into the engine. More(air & fuel) in means more out right? The increased volume and temperature of the exhaust gasses spin the turbo faster, forcing more air into the intake. With no load the engine rpms max out with very little ait/fuel input.
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