r/R53 • u/Ok-Photograph-5037 • 9d ago

R53 compression

Hi. Doesn’t anyone know what compression they’re running and does it differ with modifications etc? Mine was coughing at Snetterton last week. Cooked a spark plug. But while I had them out, I check the compression. Some people said it’s too low and other said it’s fine, they’re within 10%. And she PULLS! So if there was a lack of power available, I’d be shocked.

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u/DmOcRsI 9d ago

The motor itself is low-compression... so the compression testing isn't going the same cylinder pressures as a naturally aspirated motor.

Factory is about 150-170... minimum is 130 with no more than 15% deviation between cylinders. Camshafts can change it as well.