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So my father n I have been into racing lawnmower for a few months not. WE cvant affort to keep racing offroad buggys so we thought we would give it a go.
Anyone else race ??
We have a 18hp "Rover Rancher" that started at 11kmh and not does 33kmh.
we are currently doing a husquarna vtwin 15hp
Aswell as a ground up build with a kawasaki 250 ninja motor.
Many, many moons ago, as a bit of fun, I built one for the local fairs first races. It was a 12hp B&S rear engine Greenfields, with the biggest primary pulley I could fit under the body. It got around 40kph.
The next year I got into it a bit more and bought a Honda four cylinder CB 400 in bits for $100. After rebuilding it, I crammed that under the Greenfields with a suicide gear shift (hand shift with lever clutch). A mate's son drove it, but its centre of gravity was way too high to be competitive.
Third year I got the foot pedals (clutch and gearshift) working on another old Greenfields with the 400 rammed into it. The rear end used the stub axles and drum brakes from the front end of an old suzuki swift. The front wheels were pressed steel halves ones that were bolted together. I had to weld them up to comply with the regs.
I built it with four Holden 12v ignition coils. Combined with its four carbies, that thing could get from zero to 90ks and back to zero in just over 140metres. Never got it out of 4th gear and it had two more to go!
After its first test run, it had bent the steel 20 x 50 RHS chassis. I welded another rail to each side and used that as the exhausts. It never ran long enough to get red hot so it worked fine.
Last edited by mudnut; 8th October 2020 at 10:22 AM.
I have seen the steering fail, with disastrous results. I over-engineered the steering on mine. The drag link/tie rod was 3/4" bar with some short lengths of 3/4" welded at the ends. I had already drilled 1/2" holes through the axis of those pieces. So as not to weld hardened steel, which makes it very brittle. I obtained some hardened bolts with the same thread as some small tie rod ends I had in shed. After forcing the bolts through the holes I welded a stop behind the head of the bolt. If I had the cash at the time, I would have used 12 mm swivel head rod ends.
Last edited by mudnut; 8th October 2020 at 10:23 AM.
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