JP and Associates is proud to offer pistons for the 912, 912s, and 914 engines. When it comes to pistons, nothing beats the dependability, longevity, and strength of a forged piston. So why do Rotax engines come with cast pistons?? Simply, forged pistons cost more than double to manufacture. It takes a lot of time to engineer a forged piston for an aircraft application.

A forged piston is a piston which is placed in a set of dies and smacked with a huge 9000 lb hammer. This hammering on the piston makes the piston denser, and also strengthens the surface thru a process of strain strengthening.

One draw back of a forged piston is that it has a much higher coefficient of expansion then a cast piston, so if the piston is not engineered correctly, it can lead to serious engine damage. Rotax engine rely on air to cool the cylinders, so when a Rotax engine is at high altitude, and throttles back, the cylinder shrinks. If the piston was not engineered with enough room to shrink, the piston can break. If the piston has too much room, it will result in piston slap even when the engine is warm. All JP ASSOCIATE pistons have been fully engineered up to 25,000 feet. The process of engineering a piston for altitude is called engineering for thermal shock. One other critical aspect of a cast piston or forged piston is the alloy content of the forging. The amount of silicone content is critical for a well engineered aircraft piston. Finally, the rings on our pistons are fully compatible with Nickel bore engines. With our pistons on a stock engine, overhauls should go beyond the stock overhaul schedule of 1500 hours. All pistons are weight matched, and machined to the highest precision.

We have made it my goal to manufacture and engineer every part necessary to overhaul a Rotax engine. We will serve the aircraft community by engineering every component as if we were going to fly every kit produced.

We will not unfairly price our product and gouge the public.

Reasons why our pistons are the best

Forged pistons are many times stronger than cast pistons. Take the punishment of higher horse power and moderate detonation if it occur Stronger ring lands mean a longer piston life. Rotax charges 1100 for a set of cast pistons, 550 for rings and 200 for wrist pins.

Forged Pistons for the Rotax 912ul and 914

Pistons rings wristpins 650 shipped US

Both the 912ul and 914 use the exact same pistons. Our drop in replacement does not change the compression ratio. It is absolutely necessary to have forged pistons if you have a 914, or a high compression engine.

Forged pistons for the 912S

Our drop in replacement for the 912s retains the stock compression ratio to within 1/10 of a compression point. These pistons are forged, unlike the cheap stock cast pistons. If you have heard about engine pulling too much pitch and damaging pistons, you might want to consider buying forged pistons.

Super Extra Pistons

This is what got me to start manufacturing my own pistons. Originally we were going to just purchase pistons from the company the sells the xtra kit, but I didn’t like that I had to use Rotax rings with the pistons. Our pistons use the best rings on the market, and cost 1/4 the Rotax ring price. Next time for an overhaul it will cost 1/4 the price! Our Super Extra kit is priced way below the extra kit, and comes with a lot more engineering for thermal shock. FYI, Extra kits cost 900 without rings, or pins.