If you are looking to rebuild your 1.8L BP engine and put a little more power in it while you are doing it, look no further! The Maruha Original design 85mm crankshaft is your solution.
Utilizing high precision casting and a lightened weight of 1kg compared to stock, this crankshaft is what you need to refresh your engine and add a significant rev-happiness to your NA or NB 1.8L Miata.
This 85mm is a direct replacement of any old worn out or damaged crankshaft for 94-2005 BP engine models.
For extensive information on how this crankshaft works, please visit our tech article regarding this crankshaft here -> Maruha New BP 85mm and 87mm Crank Shaft Explained
This item ships within USA and Canada via UPS or FedEx ground. For international shipping, please contact us!
Price is only for the crankshaft. Other required and related parts not included such as crankshaft bearings, seals, headgaskets.
**Please note. The current in-stock 85mm crankshafts has a factory sized nose, not the extended nose. These factory nose 85mm crankshafts will be sold at a discounted price until depleted. New version 85mm crankshafts will not arrive until late 2026-early 2027.
