Posted by clare at snyder.on.ca on May 11, 2007, 10:09 pm
On Fri, 11 May 2007 10:33:51 -0500, david.williams@bayman.org (David
Williams) wrote:
>It should be easy to take power from the rollers to drive a generator,
>or whatever.
That's what the dyno is - an "eddy current" load cell. (basically a
shorted out generator)
>
>The people who use these machines always take great care to make sure
>that the car can't accidentally come off the rollers and drive away.
>Big chocks are put under the non-driving wheels, and heavy straps are
>attached to the car and some fixed mountings. If you build something
>similar, I suggest you take similar precautions.
>
> dow
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Posted by Unlisted handle on May 11, 2007, 10:23 pm
> Around here, cars have to be tested every couple of years to make sure
> they aren't emitting too much pollution. Some of the testing has to be
> done under driving conditions, with the engine, transmission, etc.,
> running as they would when the car is being driven on the road. This is
> done by putting the car on a machine where the driving wheels (front,
> back, or all four) are on rollers. Some sort of braking system is
> linked to the rollers, so the load on the engine can be adjusted.
That's called a Dynamometer. One Hot Rod shop for Motorcycles in the USA has
a dyno for motorcycles. It applies load to determine maximum brake
horsepower. The higher your BHP, the more work it will do. I'd like
something like that, but I think that's the expensive way to go for what I
want. I just want to be able to power some appliances and charge my
batteries in case of an extended power outage. I already have a motorcycle
with a 25+ horsepower motor to spare. I can dismount the engine, fabricate
some cowling around it and power a fan (or electrically) to air cool the
engine. Or I can mount the entire motorcycle, minus the back wheel onto a
skid, and hook up a generator. The generator spline can have a sprocket just
as easy as a pulley. Using the motorcycle frame as a base means I wouldn't
have to fabricate mounts for the engine. I just think this way would be
easier.
Posted by CrazyDayz on May 12, 2007, 10:11 am
> Hum . . . Wonder how much work it'd take to connect that to the PTO of my
> tractor?
There's components specifically for PTOs:
http://preview.tinyurl.com/ywgfsx
It will take you to this:
http://www.northerntool.com/webapp/wcs/stores/servlet/NTESearch?D=pto%20generator&Dx=mode+matchallpartial&Nty=1&Ntx=mode+matchallpartial&Ntt=pto%20generator&N=0&Ns=P_Price&storeIdi70&Ntk=All
Posted by CrazyDayz on May 12, 2007, 10:16 am
>> Or maybe this one, for less than half the price.
>> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?ItemnumberE416
>>
> This is good. I already have a 25 horsepower motorcycle engine to run
> this.
At how many RPM? Motorcycle engines aren't very fuel efficient when run at
near max hp.
Posted by Ignoramus6369 on May 12, 2007, 12:00 pm
My own opinion: without even considering the opportunity cost of
wasted time, increased hazard, noise, life expectancy and relative
inefficiency, based on cost of parts alone, it would be far cheaper to
simply buy a decent used generator. The cost of little parts here and
there will surprise you. All those brackets, terminals, doodads,
safety gizmos, etc etc, all add up to a lot.
i
XML site map
>or whatever.