Rotary Engine Illustrated

3mm apex seal "upgrade"?

Apex Seals -- 2mm vs. 3mm

First of all, 2mm seals are perfectly fine for extremely high boost levels. Many people sucessfully run 20+ psi on stock 2mm seals with no reported problems. However, 3mm seals are much more durable and not all of us have (1) great tuning skills and (2) the financial resources to shrug off a small tuning mistake that requires a full rebuild. One hard ping and a 2mm seal will likely break. 3mm seals generally take much more tuning abuse (multiple, hard pings), which is oftenenough margin to back off and save the motor. Also, Pineapple Racing uses a special 2-piece 3mm seal that, when it does fail, tends not to cause subsequent damage to rotors and housings. While getting the rotors machined out for 3mm seals and purchasing the seals themselves costs a bit more, it does not begin to compare to that of a second rebuild. For this reason, Pineapple Racing recommends 3mm seals to customers who plan to exceed stock power levels and/or go with aftermarket fuel injection systems. Again, it's not mandatory if you have advanced tuning skills or are willing to risk a second rebuild, but 3mm seals are relatively cheap insurance

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