More stuff...

[rocketboy]

http://www.youtube.com/watch?v=0a6njEceHPA

and...running!

http://www.youtube.com/watch?v=YGmfeNMqYVk

[compig]

Cool !!

[contaucreek]

Nice portable set-up. i would be concerned having the cylinder head as the high point in the cooling system. Is your pump able to supply continual flow of coolant?

[MacGyver]

Neat go cart!  Can we see you ride it? How fast will it go?   

But seriously... 4400 watts with "clear exhaust" from a 6/1?   I'm impressed!

[mobile_bob]

4400 watts out of a 6/1 and an st5?
with clear exhaust?

wow!

most folks are doing good to get a bit over 3000 watts, with clear exhaust
maybe as much as 3400 with some black smoke.

how did you measure the wattage? with what?

you are getting about 40-50% more than most folks get from their 6/1
and i am trying to get my head around how you get there. 

bob g

[hotater]

You must be measuring output going downhill !   

[wrightkiller]

Hey !   Hotater: How is the work on your dream place going?  We thought you got lost .   long time on hear.......

[rocketboy]

Yep,the power output is hotly debated with CUJET, but heck, he was manning the volt/ammeter while I threw on loads. In the previous config I made 3500 watts and barely 3800 watts.

We figure three effects.

1. The freon R-22 can muffler is the perfect size for expansion tuning and contibutes well to scavanging. Lucky???
2. The smaller flywheels from the electric starter system cause the engine to run faster to make 60 Hz. I figure about 710 rpm but havent'  measured it.
3. Engine broke in. Evidenced by NO blowby smoke, and better compression cranking. Also dumped the COV. Maybe better compression ratio?

As you know, running them at the correct temperature helps greatly with  power, efficiency, and smoke.

The measurements taken were at 210 deg F coolant discharge and 180 deg F entering the jacket. Air temp 88 deg F.



The Grundfos pump works VERY well as previously determined, hence the smallish 30 degree coolant delta. I see 50 degree spread using thermosyphon. Still trying to figure out how a solder a radiator cap to the high point so I can use a proper coolant recovery bottle and eliminate the spot boiling bubbles visible at high loads/temps.

4690 watts at 55-56 hz, 106 volts rack wide open smokin like a pig roaster.
4400 watts at 58 hz, 110 volts min smoke
4000 watts at 59.7 hz, 113 volts cruzin along....

The watt readings came from 240 volt loads to avoid imbalance in windings to a reasonable extent. It was steadily running a 2 ton A/C system, 1.5 HP well pump, plus I was in the house turning on electric burners in the kitchen to vary loads. CUJET was at the generator with the clamp on ammeter. I was in the house watching volts and freqs on the killawatt.  Watts were figured simply by Volts X 2 X amps. Comm was via cell phone. We repeated it to get confirmed results. Fuel was 50/50 Jet A/WMO.

Bob

[rocketboy]

High power revealed!!

After measuring the dia of the flywheels, I calc my new setup spins at 780 rpm to make 60 hz.

Everything now makes sense as the proportional increase in power fits perfectly.

Plus the gov holds much closer now... about 3 hz spread from idle to full tilt.

Bob

[oliver90owner]

Watts were figured simply by Volts X 2 X amps.



ERRR! My physics tell me Volts times Amps equals Watts.

Why the 2?  Maybe American power is different to the rest of the world?

Regards, RAB

[assiduous1]

They were probably measuring 16 amps off of one of the legs of the 220V.  That would show about 2000W off of each side, giving a total of about 4000W (x2).  That's still pretty good by what I've seen posted here.   Looks like the increase in RPM makes a 7/1 out of a 6/1.

[rocketboy]

The killowatt was plugged into a 110 volt wall outlet and thus could only read 110 not 220 so

I DOUBLED IT. Third grade math is a beautiful thing.

Amazing what happens when you actually try to get valid data by doing silly things like using only 220 volts loads.

YMMV, mine worked amazingly well. I never expected it could start much less run the 2 ton A/C AND the well pump plus other loads.

Bob

[Jim Mc]

Not a huge error here, but since two of your big loads (A/C and well pump) are motors, there's the power factor to contend with.  When you multiply V x A, you get volt amps.  Multiplying that by the power factor (I'd guess around 0.9) gives watts.

So, no doubt your actual load was a tad less than calculated with the 3rd grade math approach.  Should'a gone on to 4th grade 

[mobile_bob]

Rocketboy:

don't get wadded up over being questioned

when you report results that are more than 5-10% outside the norm you have to expect some
hard questions.

so for clarity

you loaded it with a 220 load?
and then measured with the kwatt one leg?
and then doubled the amperage (even across both legs)?


you are using 50/50 mix of jetA and wmo? (for the test)

what size is your flywheel and driven pulley?

you state ~60hz, so trying to determine your actual engine rpm.

what is needed is an agree'd upon testing protocol in my opinion

its just hard to imagine how you got the numbers you report

the st head is likely not much better than 80% at that load, certainly not over 85% efficient

the serp drive eats a percent or two, the taco pump, radiator fan as well

so you got to figure no more than 80% efficient

so 4400/.85 = 5176 watts

therefore your engine has to produce about 5200watts mechanical
that is a full 25% more than it is rated for.

don't get me wrong, i am not calling you anything
but we need to determine how you got the results  you have
and see if it can be duplicated.

btw, did you happen to note the power factor at 4400watts?

just trying to learn here

bob g

[rocketboy]

Rocketboy:

don't get wadded up over being questioned

when you report results that are more than 5-10% outside the norm you have to expect some
hard questions.

so for clarity

you loaded it with a 220 load?
and then measured with the kwatt one leg?
and then doubled the amperage (even across both legs)?


you are using 50/50 mix of jetA and wmo? (for the test)

what size is your flywheel and driven pulley?

you state ~60hz, so trying to determine your actual engine rpm.

what is needed is an agree'd upon testing protocol in my opinion

its just hard to imagine how you got the numbers you report

the st head is likely not much better than 80% at that load, certainly not over 85% efficient

the serp drive eats a percent or two, the taco pump, radiator fan as well

so you got to figure no more than 80% efficient

so 4400/.85 = 5176 watts

therefore your engine has to produce about 5200watts mechanical
that is a full 25% more than it is rated for.

don't get me wrong, i am not calling you anything
but we need to determine how you got the results  you have
and see if it can be duplicated.

btw, did you happen to note the power factor at 4400watts?

just trying to learn here

bob g

Whew....

Well, there's always correolis effect, and i think CUJET may have had beans for lunch and that introduces the dreaded  methane injection effect, my kilowatt was likley way off, as was my Fluke ammeter and everyone knows jet A has 4.4% less BTUs, so I retract all claims and retire back into my hole for another six months. Now if I can just figure out to delete those darn youtube videos.

OK..OK I can't control myself and will make a final brazen listeroid genset perofrmance claim now...

"My listeroid will make a clicketly clack sound and it will make the little red light on the ST gen glow".

Later.

RB 73's  -.. . -.- -.. ....- .-.. --. .--  ...-.-