to do to the port windows, as ANYTHING further, and you're messing with the port timing (keep in mind, we're out to build a little two-stroke screamer. 2 Stroke Engine Porting: if it is to be done right, is a very complicated task. Careful care must be taken to assure that engine will not end up making LESS. Time area: Two-stroke port duration is often expressed as a function of time/area. This integrates the continually changing open port area with the duration. Gordon Jennings' Two-Stroke Tuner's Handbook was written in the early heyday of two-stroke, motorcycle road-racing, drag-racing and motocross. A little bit of background information on Scott Schneider: Scott has been working with and tuning 2-stroke engines for 25 years; has held the NAMBA 6 lap - 1. If one just increases the port size but the air turns into a turbulent mess at the bowl and valve guide etc., it won't help increase flow much. Detailed Description. The stroke properties specify the appearance of the stroke of a path, including the width, miter limit, line cap style and line join style.
Porting a Chainsaw: 5 Steps · Step #1: Widen the Exhaust · Step #2: Remove the Exhaust Holes · Step #3: Attach the Muffler Top · Step #4: Drill on the Muffler · Step. Geoff Battick's Notes on 2 Stroke Engine Modification. © Geoff Battick. Article No. 2 Cylinder Porting. This is the real magic to most people. guide to basic moped engine crank case cylinder port matching. applies equally to Minarelli/ Aerox etc. or any other 2-stroke scooter or moped engine.
It enters via the intake port (as the piston rises) into the crankcase and then is transferred to the combustion area via the transfer ports (as the piston. Porting is a metal finishing process performed to the passageways of a two-stroke cylinder and crankcases, that serves to match the surface texture. The same principle applies to the intake and transfer ports. Thus, if there was a universal rule for the two-stroke engine's port timings, it would have to be.
These two links are a great guide, and will help you and your understanding of porting and polishing. This first link will discuss terms and the 2 stroke. Cylinder porting takes time, patience, special tools and more than a basic knowledge of air flow and velocity. Late model cylinder castings are extremely. Rule #3: Widening the exhaust port or making it more square at the top will shorten the lifespan of your rings but will usually benefit top RPM power. Rule #4.
get 'twostroke tuners handbook.' by Gordon Jennings. Its pretty much % talks about piston port engines the same as the victa. edit: on my friends victa. No matter if it's a vintage motor or one of today's highly developed two stroke engines, you need experience to improve performance. Modifying the ports to. It should be clear to anyone working on the ports of a 2 stroke cylinder that as the speed of the crankshaft increases, the time a port is open becomes. Two Stroke Engine Tuner's Handbook. A rare technical guide to the fundamentals of the Crank Train, Cylinder heads, Expansion chambers, Port timing.