Scale Model Running Challenger Flathead V8 By Ron Colonna
Bore: 1 in.
Stroke: 1 in.
Displacement: 100 cc
Max RPM: 6,000
This engine was built early in my gasoline engine building career. I received the castings and drawings as a Christmas gift from my wife. I had it running about five months later. This is the engine that creates the most interest at the shows. So much so that I've had to rebuild it twice because of wear. As designed, it had some major shortcomings. The conrods were bronze castings which promptly wore grooves in the crank. These were replaced with rods machined from 2024 aluminum. Pistons were remade and the engine fitted with rings made from the George Trimble method. Oil control rings are a necessity as the engine smokes badly without them. An electric start system was added and the engine now runs with the push of a button.
"Junior" Model Chevy V8 Phillip
Free style, 1/4 scale, chevy V8
250 cc , Weight 17 Kg , Cylinder head length 200 mm
No rotational weight added to aid idle quality
Bore, Conrod length and Stroke based on chevy 308
Fully water cooled cylinder heads and piston sleeves
Scaled down starter motor with bendix and solenoid
Scaled down clutch assembly and flywheel
Oil pan (Sump) manufactured using 1mm sheet steel
Engine block machined from billet aluminum
Bore 36.5mm Stroke 30mm ( EN9 billet Crank shaft, Internal balanced)
270 degree sport camshafts
8.6 : 1 compression ratio
Idle RPM ~980 Max RPM 6000
20W 50 motor oil (Crank , Rods and Cams 4 bar pressure fed )
95 octane unleaded fuel
Modified diaphragm carburetor ( To achieve Holly look alike)
Optical triggered Electronic ignition
3D printed plastic distributer cap
All parts manually machined, no CNC used.
This was a 4 year project (Jan 2009 - Mar 2014)
Special thanks to Jan & Jurie Naude for cylinder head and intake manifold
Supercharged home made Straight Eight by Desperate Dan Vid 2
Built in a shed, it fired up first go. I was hoping it would sound real
lumpy like a drag engine, but it runs too smooth, and it's too quiet even
with unsilenced 9" pipes! The timing was a pain to sort out the Rover
distributor runs backwards, I had to take the heads off to work out the
firing order!!! See the shed it was built in on Vid 1.
Added May 2012: OK, my nails are dirty, maybe because I'm an engineer &
build stuff? Maybe your nails are clean because you can't build eff-all &
just sit behind your computer? C'mon folk, get a life.