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lil hot rod
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zzebby
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PostPosted: Wed, Feb 25 2015, 12:21 am    Post subject: lil hot rod Reply with quote

Frank can tell me if this should be posted elsewhere, but it is a hot rod..I think. A retired Tucson circle track guy made one for his grandkids and word got out, he made more and so I got the last one, the 12th. I call it a scaled down sprint car but he says it was called a roadster ??? What you would see at Manzanita in the early 70's.
Anyway the kids wore out the tiny toy car electric motors in a few days so I need to re motor it. Thinking of a car starter and a pulse modulated motor controller and a small gel cell 12V battery. Grandkids are 5 down to 2 so it doesn't need to be fast. Motor and battery need to be behind the seat so not a lot of room.
Suggestions ?



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phat46
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PostPosted: Wed, Feb 25 2015, 8:39 am    Post subject: Reply with quote

Your plan sounds good to me, but I know nothing about that sort of thing. I just posted to tell you that is a very cool car, no matter what you want to call it. The builder is seriously talented!
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idrivejunk
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PostPosted: Wed, Feb 25 2015, 11:42 am    Post subject: Reply with quote

Thats a mighty cool toy! I'd go 2 stroke personally, maybe one of these popular 50cc jobs that seem to be in all the little rods like that. I gotta wonder if a starter wouldn't be too abrupt and torquey for kids that young. Whatever you do, just try to consider all the safety scenarios that could arise and make it kid-proof.
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kb426
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PostPosted: Wed, Feb 25 2015, 7:10 pm    Post subject: Reply with quote

Would a golf cart setup be good?
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chimp koose
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PostPosted: Wed, Feb 25 2015, 10:57 pm    Post subject: Reply with quote

I would look for the gear from an old electric wheelchair or a mobility scooter. Compact and long use also variable speed.
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zzebby
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PostPosted: Thu, Feb 26 2015, 1:27 am    Post subject: Reply with quote

want to keep it electric and 12 volt, so the wheelchair or scooter is where I'll be looking. Not familiar with golf carts but I'd expect that to be a big motor. Need advice on the speed control.
Or if a starter, what is the easiest to mount and without a solenoid and simple to add a belt type pulley?
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unklian
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PostPosted: Thu, Feb 26 2015, 2:03 am    Post subject: Reply with quote

Something like this would work: http://www.bodine-electric.com/ProductAnnouncements/abl-3906c.asp

Basically, the motor is switched on/off to adjust the rpm.
They call it Pulse Width Modulation, or PWM for short.

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PostPosted: Thu, Feb 26 2015, 2:31 pm    Post subject: Reply with quote

I don't know how far battery technology has come in the last 10 or twelve years but I built a Jeep out of a golf cart for my grandson and it had 6 batteries at about 80 lbs. each but the motor is only a little larger than a starter.
I agree that a wheelchair or scooter might be the way to go.

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idrivejunk
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PostPosted: Thu, Feb 26 2015, 4:13 pm    Post subject: Reply with quote

It just dawned on me theres a way to keep it real simple. I know you're wanting 12V and I don't know what the standard is on them but why not just find a modern second-hand PowerWheels (or similar) toy and gut that or do a body swap? I'm thinkin bang for the buck and simplicity, not to mention having most of the engineering done for you. Maybe thats a cop out, but why take chances with kids so small? The metal body is already more dangerous than say, the neighbor kids fake plastic Barbie thing. Just throwin it out there.
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enjenjo
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PostPosted: Thu, Feb 26 2015, 4:41 pm    Post subject: Reply with quote

You might look here http://www.monsterscooterparts.com/mobilitymotor.html

or here http://www.monsterscooterparts.com/18voltmotor.html

or here http://www.surpluscenter.com/Electric-Motors/DC-Motors/

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zzebby
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PostPosted: Fri, Feb 27 2015, 3:04 am    Post subject: Reply with quote

Thanks, lots of good info. Am looking at the pulse width modulator for speed control but still need a potentiometer to tie to the throttle pedal.
The motors that were on it were from the power wheels and the plastic gears are now toothless. Crying or Very sad Thus the search for improvement. The chassis and body (hand laid fiberglass) are very well built and cool so will use them as is.
Golf cart is way too much power / torque and heavy.
Wheelchair stuff is pricey.
Need a short, small 12V car starter ??? And add the pulse controller to it.
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58 Yeoman
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PostPosted: Fri, Feb 27 2015, 6:14 am    Post subject: Reply with quote

I see the scooters at garage/estate sales all the time; some are less than a $100.
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GPster
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PostPosted: Fri, Feb 27 2015, 8:53 am    Post subject: Reply with quote

How about the starter from a lawn tractor? My Sears tractor tractor is probably almost 15 years old and it starts all the time (even after sitting through the winter in a cold shed) with no problem and only 2 batteries (the original battery only lasted on season).Now my tractor has a Kohler 15hp engine and the somewhat automatic transmission (forget the name) so the battery has a higher rating. If you have the speed control figured out you might check these sources for a small starter. The number of grand kids will dictate how long you'll have to keep this thing running but you'll have to start building a car for the oldest soon. GPster
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enjenjo
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PostPosted: Fri, Feb 27 2015, 9:53 am    Post subject: Reply with quote

Quote:
The motors that were on it were from the power wheels and the plastic gears are now toothless.


How about water jetting some new gears?

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zzebby
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PostPosted: Fri, Feb 27 2015, 11:51 am    Post subject: Reply with quote

Have enough projects already, trying to make this one quick and those gears made a speed of "less then walking". Even the two year old thought it was too slow.
What starter ?
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unklian
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PostPosted: Fri, Feb 27 2015, 12:14 pm    Post subject: Reply with quote

Potentiometers are dirt cheap, the value depends on the motor controller.
Some manufacturers use 5K, others use 10K.

Potentiometers come in 2 basic types, linear and logarithmic.
You want linear.

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unklian
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PostPosted: Fri, Feb 27 2015, 5:20 pm    Post subject: Reply with quote

The industrial DC motor controllers, usually allow you to adjust
the acceleration rate, plus max and min rpm.

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unklian
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PostPosted: Fri, Feb 27 2015, 5:58 pm    Post subject: Reply with quote

When choosing a controller, check the input and output voltages.
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PostPosted: Sat, Feb 28 2015, 7:52 am    Post subject: Reply with quote

Hello;
My 2 cents. Go to Walmart and look at the electric scooters they have. You get everything you might need (except a way to put it in your car) for about $100.00 or so. And those scooters really do scoot!
Other than that I couldn't be any help.

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zzebby
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PostPosted: Tue, Mar 03 2015, 1:19 am    Post subject: Reply with quote

Scooters at Walmart for $100 ??? I will check that although I never normally go there.
And uncle Ian, yes will get that controller. Plan on a small 12 battery (lead acid or gel) and a 12V starter, probably Ford type as it has no solenoid. Will need to mill a keyway in the starter shaft.
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