Vintage modern Kart Build

smoothimage

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Have been wanting to build an old school chassis with some parts I've had laying around.
 

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madprofessor

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That's a truly great looking shop, big fan of the kitchen cabinetry, above and below. Brake press, hydraulic press, all easy to see, but what kind of cutting plotter is that? Plasma table? Laser?
 

madprofessor

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it’s not his garage. It’s his kitchen!
Might as well be, he's cooking up a great start on what looks like it'll be a nice kart. The upper cabinet cutouts for a fridge and a stove hood are obvious, but so is the rollup garage door.
Smooth, how did you come to end up with all that kitchen cabinetry in a great big garage? I built some into my past garage, but nothing near as complete or nice as yours.
 

smoothimage

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Well Mad cabinets came from a manufactured home that was being remodeled and where I live use to be a retirement community with large lots and boat and RV garages.
 

smoothimage

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Got steering cut down, milled and tapped, made a quick jig for spindles to set arms 105%
 

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smoothimage

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Mock up of steering and motor
 

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madprofessor

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Really trying to understand what's in the pics, I promise. Oh, and that's fantastic that you can mill your own parts!
Guessing 105 degrees means the spindle arms are 15 degrees away from being a right angle, at least that's about what it looks like. However, while being leading arm spindles (forward of the kingpin bolt) they appear to be pointing inward instead of outward. At 15 degrees that would be extreme reverse ackermann angle.
Trying to wrap my head around the geometry, but no matter how my mind sees it there's still extreme scrubbing and pushing in a turn. Please don't take any of this as criticism.............Zero ackermann angle would (with the wheels pointed straight ahead) have a spindle arm's tierod connection and the spindle's kingpin bolt being in a straight line with the exact center of the rear axle (you stretch a string tight across it all). With leading arm spindles (like yours) the arms would be pointing outward. With trailing arm spindles (opposite of yours) the arms would be pointing inward.
Please tell me if this reverse setup would work, and I'm just unable to picture it. I'll believe you, since I can't trust my spatial grasp anymore.
 

smoothimage

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Yes this set up works great in the soft sand and dirt that around me. I find with the arms behind link pins it pushes,scrubs or slides more in the turns I guess what I'm trying to say the outer wheel feels like it bites more, that just what i found works for me. Its a great question
 

smoothimage

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Well explaining this in detail could take a bit, so I’ll give you my short version. First the simple karts that I’ve built for grand kids are driven on dirt and sandy roads, there is no camber or caster or suspension built in. second I like using the china 110cc motors which seems to make a little more torque and power, so in the dirt I seen the kart are sideways most of the time, its fun when you can drift corners anyway moved to parallel steering with slight toe out, made front wheel base wider you know the normal steps for this. so with anti ackermann the tire slip angle on outside wheel on my carts was greatly helping control the *** end come around in turns. There a lot of info on this subject and arguments to be made along with it. But its fun to experiment and learn new things I do a lot of reading and by no means an automotive engineer, anyway thanks love the feed back on the Kart.
 
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smoothimage

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Note: yes I know most off road cars ,karts, buggy's, use more standard or pro ackermann, but it works for my application.This video
shows some good points
 
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madprofessor

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Don't know about others, but the reverse ackermann question fascinates me. I'm going to research that geometry and get myself an answer, have no choice, it'll drive me nuts if I don't.
 

COB619

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It’s hard to tell from the pics but just wondering about the rack and pinion set up. Mine looks similar and the first time it was mounted it would turn the tires in the wrong direction so I had to flip it around. Sweet build wish I had a bender!
 

madprofessor

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mounted it would turn the tires in the wrong direction
I see that too COB. My eye is saying it's backwards in the pics with the steering shaft on top of the rack, but only needs to be rolled over 180 to put the steering shaft on the bottom and make it work correctly.
Is that right, smooth?
 

Denny

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Anti Ackerman is only good on soft dirt or mud. It is where the outside tire is the only front tire biting into the surface to steer the kart. Will not induce over steer to bring the but of the kart around.
 
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