Inside a messenger 2KW (2) drving 16 pills

[-=PEAKABOO=-]

Car audio guys and there 400 amp alternators.

 

[jaybird]

perhaps there amp meter is a loose as some folks wattmeters...:closedeyes:they sure look like 160 amp leeces..

nice pics cotton mouth..interesting piece it is..first time i have ever laid eyes upon one

 

[Shockwave]

Well come on tell us a little more than that, quit teasing like that. Shit that there is above and beyond me. Do you think that I could maybe run my 2K from that sub station and get my name called? Hell with my 2K you could shut down 14 out of 16 Alternators and save all the headache and coin it would cost to run all those.

I would like to see pictures of the motor that powers all those when you go to drop the Hammer. Maybe a 4.25 Cat Engine might be able to do it with out killing the engine and burning up the Turbo. I can't see any Gas Burner going to be much help. That would be like running my 2K off that system, not cool.

I will say this though that is a sweet set up and someone was pretty creative in the design of it all, now I would like to see the rest of it all so I can be able to tell if all those Alternators are gutted and hollow out and all show and no go.


Cotton Mouth.

Cotton Mouth is right. Not even a big block is going to develop the torque required to turn 16 of them alternators under any significant load. I've seen a built 454 snap it's harmonic balancer right off the front of the crankshaft from spinning 7 of them at full load. To give you some idea of the torque needed, the 454 made over 500 foot pounds and 500 horsepower. The motor struggled to build up 3400 RPM in park with the throttle floored! Then the balancer snapped off. How do you think that 1 inch shaft spinning 8 in the pic is going to compare to the big block crank?

If you didn't mention this was for car audio I was leaning towards thinking someone spent a lot of time in PhotoShop. It could work for an audio amp since there is no carrier. The load audio amps draw is more like a SSB transmitter. It only comes on hard when there are audio peaks or bass reproduction. Even then the load is only for a short period of time. Giving the electrical system time to recover. This is why they can use things like big capacitors to store energy effectively.

The load required to produce something beyond a 10 KW carrier is quite different. The large carrier alone presents a heavy current draw even before modulation conditions. In a DC system the alternators are set to charge at a higher voltage then the batteries. This makes the alternators do most of the work under load if they are big enough to hold the voltage. In an AC system the capacitors can do little more then filter out AC hum. They will not be able to store significant energy beyond filtering and that again means the alternators are doing all the work.

 

[mackmobile43]

Cotton Mouth is right. Not even a big block is going to develop the torque required to turn 16 of them alternators under any significant load. I've seen a built 454 snap it's harmonic balancer right off the front of the crankshaft from spinning 7 of them at full load. To give you some idea of the torque needed, the 454 made over 500 foot pounds and 500 horsepower. The motor struggled to build up 3400 RPM in park with the throttle floored! Then the balancer snapped off. How do you think that 1 inch shaft spinning 8 in the pic is going to compare to the big block crank?

If you didn't mention this was for car audio I was leaning towards thinking someone spent a lot of time in PhotoShop. It could work for an audio amp since there is no carrier. The load audio amps draw is more like a SSB transmitter. It only comes on hard when there are audio peaks or bass reproduction. Even then the load is only for a short period of time. Giving the electrical system time to recover. This is why they can use things like big capacitors to store energy effectively.

The load required to produce something beyond a 10 KW carrier is quite different. The large carrier alone presents a heavy current draw even before modulation conditions. In a DC system the alternators are set to charge at a higher voltage then the batteries. This makes the alternators do most of the work under load if they are big enough to hold the voltage. In an AC system the capacitors can do little more then filter out AC hum. They will not be able to store significant energy beyond filtering and that again means the alternators are doing all the work.

Most of the bone heads I've seen that mount alternators on an engine have them all mounted at the top thus putting a hell of an upward load on the crack shaft and that's what snaps them off.

 

[linearone]

Most "boneheads" with snapped cranks I feel are the result of the shock of the alternators being fielded. Its a combination of HUGE driveline like shock being applied to the wrong end of the crank and perhaps a harmonic that is exploiting defects in a casting that would normally never arise. The rear of the crank where its is really thick is where the load is meant to be placed. Imagine neutral dropping a car dragging an anchor behind it. If I had more money Id do a van like some guys but even that has its own issues with cooling, fire prevention and controlling it.

In an ac mobile the shock is incredible when you key up because of how we are fielding the alternators. the faster we spin them the higher the voltage the greater demand for current and the more load is placed so we spin them higher to compensate etc etc. its like a tractor pull.

In my truck with my pulley diameter, belt tension and fielding system I have full output at 2200-2500 rpm. thats it. then the alts go flat.

Ive never seen or heard of a DC truck snapping its crank. they just dont need the rpm.

When/if my crank ever snaps Ill have to decide weather its better to buy another truck or buy a cast steel crank engine and pray for the best.

oh well, nothing is cheap.

 

[jesse10x]

Heres pics of inside a ultra rare messenger 2KW. All this amp needs is a radio to drive it. It has an internal driver (2) 2879's driving (16) 2879's. Check out the filtering. Any one have the info on who built this amp? Where can I get Schmatics? White papers? Operating manual? Enjoy the pics! Clickie
Note: This is a mixture of before and after pics. This amp was rebuilt by a ham operator. He claimed to improve IMD products by changing a few things inside the amp. He also claimed that this amp would perform better IMD wise than a henry SS750 on 11 meters.
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can you make these in slide show?very nice though

 

[-=PEAKABOO=-]

can you make these in slide show?very nice though

Just click on them and take your time. It is enough work just uploading all the pictures.