Supercharger vs turbocharger

the intake for a weedeater is internal, it uses the vacum from the piston to draw air. It does have a valve, reed style.

sad panda: they do not require one but do need one. We run them in crains tugs and genorators. If the supercharger fails they will run, just not worth a crap.

phroziac: The only ones I know of that are proportioned to a motor are the new ones on the newer cars. Mostly boost is adapted to the build of the motor.

 

Are you drunk? the weed eater is crank case scavenged , it does use piston vacuum to fill the crank case then during the power/exhaust stroke it is compressed and fills the cylinder at the bottom of the stroke.
A 2 cycle detroit will not fill it's cylinder with air without some sort or supercharge. And turbochargers are sized according to the size type and power range of a motor . yes you can find little bits of information to support your arguements but those are based on questionable information.
If you would like to check your 2 stroke buy an old 671n and disconnect the blower and see if you can get it to run with out some sort of outside air pressure.

 

I have to comment on this Phroziac. The fact is that a turbo actually reduces back pressure when compared to standard exhaust system. A turbo can be run with vitually any style exhaust because of the fact that air is forced through the exhaust ports. Some back pressure is required for your motor to build torqe. The turbo does not take any power from the motor to turn the turbine. Exhaust has to go somewhere and the turbine is designed to take advantage of the FREE wind power. The exhaust system does not have to be tuned to scavenge the air from the cylinders as it does with other fuel/air sytems.


http://www.dragsource.com/logmani.jpg


If in fact your theory was correct then why would anyone run any exhaust at all on a race car with say nitrous? Why are headers TUNED?


You bit off more than you could chew with your comment as I have been building turbo motors longer than you have been alive. Sorry to burst your bubble.

As to your question of putting a twin turbo cat set-up on a car? Yes you could. Of course it won't be just a simple bolt-on operation you will have to determine correct AR for the inlet side and determine how much lagg time would be acceptable based on your needs. It could be a great set-up for say a salt flats racer but certainly not for a drag car. Feel free to pick my brain on turbo's any time.

 

And haven't learnt much about them.

 

Nope, not drunk, and I did not say the weedeater was not scavenged. If you disconect the supercharger it will not run. It has to be removed or blown to peices. That is the about the time it fills the hull of a dreadge full of oil.

 

It's called a blower not a supercharger..... I have a DD 8V71

 

I had a retired gentleman who restored an old GM school bus tell me the 6v71 meant 6 cylinders V shaped block and the 71 was the cubic inches displacement of each cylinder. Meaning that was 426 ci V6 engine. Can anyone confirm this?

 

That would be correct and waterman1000's 8V71 has 8 cylinders # 71 cubes
I have detroits larger brother a 12V92 with 2 blowers and 2 turbochargers how that for fun

 

WOW thats huge! What was that monster used in?

 

Hard to Believe but for OTR trucks. Same thing as the old KTA600 from Cummins the old 3408 Cat could be ordered in a truck. If you wanted the HP you could get it.