If apex seals become worn, punctured or cracked, this can lead to decompression and reduced performance in two of the three chambers. (Remember that due to the nature of a triangle, each seal is responsible for the integrity of two adjacent chambers.)
The apex seals are an integral part of the combustion process and should therefore not need to be replaced any more than an engine overhaul, ie. H. for normal driving. Somewhere between 100-200,000 miles maybe less.
Q: Then how many apex seals does a rotary engine have? A: Three per rotor.
As with any engine, if you take the time to look after it properly, it will last longer than usual, but that can mean 80,000 miles or less.
On average, it costs about $5,800 to hire a mechanic to rebuild your RX-8 engine and about $4,400 if you buy the parts and rebuild it yourself.
Rebuilding a rotary engine is actually quite easy, much easier than rebuilding a traditional piston engine, basically you build from the bottom up by layering parts on top of each other. Well, there’s a lot more to it than what I just said, but those are the basics. if you’re a little mechanically inclined you shouldn’t have a problem.
The average cost of a Mazda RX-8 engine compression test is between $88 and $111. Labor costs are estimated at $88 to $111. This range does not include taxes and fees and does not take into account your specific model year or unique location. Corresponding repairs may also be necessary.
Rotary engines are notorious for being typically unreliable, but the problems are pretty easy to fix.
Cast iron tip seals (stock item) are best for many applications. As long as you never exceed 8,500 rpm (RX-8 – 9500 rpm) and don’t run the engine heavily boosted (no more than 12psi boost pressure), the stock gaskets will “seal” better. last long.
Due to the long and uniquely shaped combustion chamber, the engine’s thermal efficiency was relatively lower compared to piston-cylinder counterparts. This also often resulted in unburned fuel leaking out of the tailpipe (hence the tendency of Wankel engines to misfire, which is obviously as awesome as it is inefficient).
It’s a 12-rotor Wankel, which, for reference, is three times as many rotors as in Mazda’s Le Mans-winning 787B. The engine consists of three banks of four rotors each.
The Mazda RX-8 is powered by a 1.3-liter RENESIS rotary twin-disc engine that produces 212 horsepower at 7,500 rpm and 159 pound-feet of torque at 5,500 rpm performs. However, when equipped with a manual gearbox, the RX-8 rotary engine produces 232 hp at 8,500 rpm.
Since the RX-8 hasn’t changed much over its seven year life, we recommend a 2010 or newer model due to the improvements to the engine that greatly reduce bumps and flooding, and most importantly oil consumption . If you are on a budget and looking at an older model, try to find a low mileage car first hand.