Basically my mind won’t stop building A-MOD cars and it’s been keeping me awake at night. How much of that is related to last week’s adventure in DIY home-wrecking and how much is just frustration at not being able to build anything (or even able to type anything as I will explain later)?
I have been thinking about taking the driveline out of one of those AWD quadbikes and stretching it out to the required wheelbase and track for an A-MOD car. Basically that would require making one new drive shaft and 2 new axles to put everything on one side of the car so the driver could sit beside the engine instead of over it, and get everything as close to the center as possible. Quadbikes are literally available all over the place out here because nobody can find parts to fix them so when they break they get thrown away, and because nobody does routine maintenance on them they break with appalling frequency. So they are literally available for towing fees or “How much you wanna pay me to haul that off?” If you get one that has good parts support they are somewhat fixable but those are not the kind that get thrown away, otherwise you try to find a bunch so you fix one and use the rest for parts. So the build process is basically find a quad, cut off the front end and build new pickup points for the front suspension that moves the wheelbase out to 72″ and the track to 42″ and widen the rear to match the front. Then move the controls to the side and down so that the CG is close to centered on the new layout with the driver and because the driver is on the same plane as the rest of the vehicle the vertical CG is lowered a bunch. Swap out race slicks for the all-terrain tires of the quad and semi-instant A-MOD car!
The other idea that has been prancing through my mind is a variation of the sidewinder build trailing A-arm rear suspension that puts the pivot point of the suspension next to the output shaft of the transmission so that chain tension wouldn’t change much as the rear suspension traveled through its range. Basically the design change was a single structural member from the pivot point of the A-arm to the rear axle bearing support next to the chainline, to prevent flex from the chain pulling the axle forward, and one diagonal that runs from the pivot behind the engine to the far support bearing while another runs from the chainline support to the support on the driver’s side of the axle, with another running in front of the rear axle sprocket to the engine side bearing support on the axle to prevent flex when cornering. The best way I can describe this is it will look like a flattened A with one leg missing and a line up the middle and another leg to the center on the side away from the driver from overhead. Because I plan on running the same size tire on both ends it will have only one spring and shock absorber on that center bearing support, as close to the axle as possible to get what is technically a “zero roll stiffness” suspension so that all the roll stiffness is in the front and the car will corner on the outside front and both rear tires to prevent massive oversteer under power. Having the full length and width support only on the side away from the driver allows the driver to sit further back in the car while still allowing for suspension travel.
Now, about that typing issue mentioned earlier. Basically what it comes down to is stuff from the cuts on my hands got all stiff and I couldn’t hit the keys with my fingers. Long story is some of the cuts opened up and started bleeding so I had to put bigger bandaids on them with more antiseptic, leaving me with two fingers that couldn’t bend, the index and third fingers, and typing became a single-handed operation of hunt and peck. And slowly because sympathetic pain every time I moved the fingers of the other hand because I use both hands to type and I kept trying to use the injured hand. So no new posts until the hand healed enough that I could type. But now I’m better (or as the saying goes “good enough”) I’m doing another post.