Rotating Sphere 4 Stroke Engine


Donating Member
Here’s a 4 stroke engine concept you have to see to understand, the Peraves Superballmotor uses a multipart sphere to replace the usual crankshaft, rods and pistons of a normal internal combustion engine.

The moving parts of the sphere have ceramic balls on their exterior which travel in grooves in the case surrounding the sphere. The rotating motion of the sphere causes the moving parts, which serve as pistons, to go through the 4 stroke cycle in 2 working chambers, which would be comparable to a 2 cylinder engine. Air and fuel are introduced at the sides near the rotating axis, are supercharged through the use of prechambers, flow into the gaps in the sphere created by the motion of the sphere, followed by compression, power and exhaust as you would expect. You have to watch the animation on their site to see the whole process because a description doesn’t work very well.

"Start Video" is at the bottom of the page, LINK:


Jay Willie

Donating Member
Server for video must be overseas? Takes a looonnnnggg time to load.

WOW John! Very interesting, I'd like to see this up close and personal. Any output/fuel consumption numbers? After seeing the little Arielatom roadster, makes me wonder about putting one of these at each wheel of an exoskeletal package like the Ariel....???

Cool technology! :thumbsup: :beerchug:


Donating Member
downloaded the wmv file and watched. very cool concept. i would like to actually hear what it sounds like.

hmm... wonder what the tolerances are and how it actually seals the "chamber"...


Sounds like a variation of the rotary that sits in my car right now......

Now that it's finally downloaded and I have watched it...I guess I don't really understand how the strokes actually exert force and turn the motor over....Seems like an overthought rotary with more things to go wrong...but who knows?


looks pretty sweet to me. Youd achieve rotation by the chambers expanding, which would force the ball to rotate, because the ceramic balls have channels that they're forced to follow. as they separate, they're also forced forward.

I bet you could get RIDICULOUS RPM out of that, too.
Thread starter Similar threads Forum Replies Date
N How Much Can Gas Can A Stock Rotating Assembly Hold Nitrous 22
RideLikeTheWind High Intensity Red Rotating 1157 Bulb Electrical Mods 4
RideLikeTheWind Rotating / Pulsating 1157 LED Brake/Running Light Troubleshoot Electrical Mods 0
S Rotating Bulbs Busa Mods 4
P Saved a few grams on rotating mass pics General Bike Related Topics 49
Guclu How many riders can you fit in a sphere ? General Bike Related Topics 12
pashnit Had a stroke while riding my motorcycle. General Bike Related Topics 44
Jose J Ortega Brad Penn V2 4-stroke motorcycle oil Maintenance and Do-It-Yourself 3
T Ronax 500 – Street Legal Two-Stroke GP Replica General Bike Related Topics 11
heavybusa Victorinox had a stroke Monday night Random Thoughts 24
C Super-Short stroke crank Engine and Performance mods 8
S just another 4 stroke to 2 stroke conversion thread Random Thoughts 8
NIGHTFLIGHT When a 4 stroke becomes a 3 cylinder 1/4 Mile 1
S Old two stroke engines. General Bike Related Topics 15
slatroni Crank, long stroke or short? General Bike Related Topics 1
Mr Bogus 4 stroke power leaf blower/string trimmer Random Thoughts 12
Robot Run your two-stroke in reverse? Random Thoughts 7
TruWrecks My Mom's stroke: Update Random Thoughts 13
TruWrecks Mom had a mild stroke last weekend Random Thoughts 26
goodluck anyone a boat mechanic 2 stroke Random Thoughts 1
chozen1 Stroke kit or not Engine and Performance mods 4
K Isreal Sharon suffers stroke Random Thoughts 4
Commuta_Busa +Stroke dual torque peak Busa Mods 4
Revlis Found a badass 2-Stroke motor... Random Thoughts 26
IG. Converting 4 stroke into 2 stroke plus turbo Turbo 5
IG. 2 stroke turbo engine (FI only) General Bike Related Topics 6

Latest Bikes

  • A blue bike
    2017 blue & black
    • Hayabusa Wannabe
    • Updated:
  • 2011 busa
    2011 limited edition candy sonoma red busa
    • Hetheus
    • Updated:
  • New guy here
    Hey what’s up everybody! My names Matt from Southern California. I just...
    • Los.great.beard
    • Updated:
  • My 2014 Hayabusa
    2014 Hayabusa 50th Anniversary
    • Dljat2
    • Updated:
  • Hi Everyone
    • BirolBora
    • Updated:

Forum statistics

Latest member