Primitive Power Consumption

What would the power consumption of a primitive 6v motorcycle, say a
Dnepr MT9, be running constant loss ignition?

How long would a good, fully charged 11Ah battery last?

What would be the power consumption rates for such a machine? With
lights on? The generator is rated at 6v 65Watt if that helps.

 

Have you considered a bicycle dynamo?

 

No but if I had one to hand then yes. Unfortunately I don't.

The plan is to have two charged batteries for the ~200 mile trip, which I
reckon will be about 5 hours. Just in time for sunset.

I have no idea what the charging fault is; may be the battery on the
machine is weak or it may be that curse of Warsaw pact machinery: the
fuse box.

If there is an appreciable voltage drop between battery and coil I'll go
for the old standby of a bit of wire between battery and coil.

Reminds me Platy, I need some wire and crimp terminals (I can't get to
the workshop again today) to make said bypass and some hairy string.
Hairy string is *essential*

 

fairly cheap

http://www.bicycleworkshop.co.uk/products.php?plid=m2b0s133p1

romantic.

 

Coil will prolly use about 20 Watts - about 3amps @ 6V

Without lights - probably about 2 to 3 hours although the voltage may
drop enough for the sparks to be a bit weedy before that.

Lights are prolly 25 watt headlamp - (about 4 amps or just over) and 5
watt tail light (about an amp)...

 

I reckon you're about right there. With a bit of luck...

I think I'd try to source a third battery - a big old six volt car
battery (as used on old Beetles or MGB's) in the chair would be handy
ballast as well as allowing a bit more leeway on the travelling.

 

sweller wrote

**** nose but leaving the lights on would halve it, at least.

Assuming the generator is powerful enough to keep all the electrics
running and have enough left over to charge the battery then you can be
certain the system is drawing less than 10A.

Prolly about 6-8 in reality.

Which is about an hour and a half to two hours running from the looks of
it, 4 at most.

 

It was somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "sweller"

Generally, an old points sytem on a 12v car would take 4A at tickover,
dropping to 1A at normal running speeds.

I'd expect your heapofsh... your finely crafted piece of workers'
engineering to take double that, being 6V, iow 8A down to 2A but having
only two pots might change things. If it's a lost spark system, you're
still running the equivalent of 4pots.

So,,, 8A max, 2A min.

An 11Ah battery might last you 5hours, but then again, it might not...
best take two or three fully charged ones.

Why 11Ah anyway? Just take a 40Ah car battery. It's got a chair after
all.

 

I'm sure TOG would have a spare 6V battery lying about the place, if you
needed something for the last stretch.

I'll bring the meter with me - we can check the output voltage before you
set off.

Yup, I'll organise that.

Indubitably. I'll knit some up from my pubes this evening.

 

It's 6v. I don't have a 6v 40Ah car battery but I do have a 6v 11Ah bike
battery.

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, sweller

Are you really sure of that? Have you checked the nether regions of your
garage?

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
ZZR1100, Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"

 

Yes. Useful stock I have a good idea of.

Mystery British bikes is anyone's guess.

 

It was somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "sweller"

Doh!. <smacks self on side of head>

Have a look around and see if you can find / borrow a 12V battery with
open cell connectors. S/t screw into the middle connectors and use one
half then t'other on the way down.

 

I've tidied it.

It does now have a bloody outfit in the way.