As mentioned in the progress report on Russell Sutton’s 9 cylinder radial engine, he’s already begun work on his next project. This one’s going to be a real beauty, a 14 cylinder radial in two rows of 7 cylinders each. The top ends for each cylinder will be from a Yamaha XV1700 Warrior. The complete engine will displace 11.7 liters, 835cc per cylinder.
We’ve seen some other engine projects that began as nothing more than an idea, Aniket’s Musket V-Twin and Allen Millyard’s big 5 liter “Flying Millyard,” and both required new engine cases to be designed and cast at the start. This engine starts in the same place and Russell, working with Ian Drysdale, drew up the cases in CAD and patterns were made which have been sent off to the foundry.
There are two patterns and three castings. The case OD is 500 mm’s at deck height and the weight will be 90 kgs when cast. It will be done in A357, a 6000 series aluminum which will be tempered to T6. This will be strong with reasonable machining properties.
The engine will be supercharged with a Vortech centrifugal V3 SCi which is designed to have the throttle body upstream of the supercharger intake rather than inline before the plenum.
Compression will be reduced from 8.3:1 to 7:1 and 10 lbs of boost will be applied to keep the compression pressures no higher than 12:1.This will ensure that standard auto pump fuel can be used.
This boost should put the engine into the 500 plus HP range at 2500 Rpm with stomping amounts of torque. Careful design of the cam ring profiles will help to achieve this using Chevy roller lifters.
Both cylinders will be used from the XV Yamaha engine with the front cylinder being the front row and the rear cylinder being turned around to face the back of the engine. This allows the header pipes the come out of the cylinders in the same direction (i.e. to the left as viewed from the rear of the engine) and then be curled up and over the heads to join a single ring pipe over the center of the engine. This will keep the header pipes the same length.
The supercharging is necessary to make good power given the very low state of tune the XV twins have and to balance up air flow into the engine with the intake pipes being very different lengths and shapes front row to rear row.
The engine will have an ECU for fuel and spark. Not sure if an ECU even exists to do this.
Is this sinking in? Russell is building a supercharged, 2 row, 14 cylinder radial engine using 14 top ends from a Yamaha V-Twin, casting the cases, fabricating an enormous number of custom parts and expecting to make 500 horsepower or so, and doing this all in his less than luxurious garage.
Russell has promised to keep us updated, so take a good look at theses photos and remember how it all started. It will be a great reference when 14 cylinders are all firing and making those glorious radial sounds.