Ceramic apex seals are the ultimate seals for racing engines. Now, not every racing engine is going to need these, they are expensive, and for the most part, they are worth it. They don’t break, they can handle high heat and the best part is how light and resilient they are.
What is an apex seal made of?
There are three (3) common types of apex seals for 1974-95 engines: Cast iron (stock), aluminum-filled carbon, and ceramic. Your selection will depend on many factors, including: RPM range, normally aspirated or supercharged, acceptable wear rates, and cost.
How much is an apex seal?
Apex seals are like piston rings. Replacing them is akin to rebuilding the motor. A rebuild will usually cost a minimum of $1,500 – 2k on parts alone.
How long can RX-8 engine last?
The Wankel rotary engine carries a lot of power. It’s not certain exactly how long it runs, but suffice it to say that if properly maintained, it’ll last around 150,000 miles on average.
How long do apex seals last?
Those apex seals don’t tend to last long before they need replacing, either. Rebuilding a Wankel at 80,000-100,000 miles is typical, and earlier than most piston engine need such exhaustive work.
Why are rotary engines unreliable?
Due to the long and uniquely-shaped combustion chamber, thermal efficiency of the engine was relatively lower compared to piston-cylinder counterparts. This also often led to unburnt fuel leaving the exhaust (hence the tendency of rotary engines to backfire, which is obviously as awesome as it is inefficient).
Are rotary engines reliable?
Rotary engines are known for being typically unreliable, but the issues are somewhat easy to resolve.
How often do you change apex seals?
The Apex Seals are an integral part of the combustion process, and therefore shouldn’t need to be replaced any more than you need an engine rebuild, for regular driving that is. Somewhere between 100-200k miles maybe less.
What engine is in RX-7?
As you’d expect from Mazda, the RX-7 was the oddball of the bunch, courtesy of its twin-turbo 13B-REW Wankel engine. With twin rotor chambers (each displacing 654cc) and turbo equivalency applied, the RX-7 was deemed to have a 2.6-litre motor.
Why do rotaries burn oil?
Do Rotary Engines Burn A Lot Of Oil? As part of the normal operation of the engine, the rotary engine burns a small amount of sump oil. Oil from the sump is injected directly into the combustion chambers to lubricate the apex seals, which also helps to increase compression.
How much does a rx8 engine swap cost?
The cost will differ depending on how you plan to approach this project, but it should be achieved with around $10,000.
How much does it cost to replace apex seals in rx8?
It costs around $2K in parts per attempt on average, more if you replace all the stuff you really should replace.
How much does it cost to repair apex seals?
Replacing apex seals requires disassembling the entire engine. They won’t necessarily help if the surface they mate up to (housings) is in bad shape. A rebuild kit is $1k-$1.5k for gaskets, seals, etc. Housings are another $850 each (there are two).
