Beta 20 3 Cylinders – 719cc – 20bhp max at 3,600 rev/min – 104Kg Standard Specification Beta Marine – Beta20- 3 cylinder, naturally aspirated, diesel propulsion engine developing 20 bhp at 3,600 rpm with a swept volume of 719 cc’s (Recreational Craft Directive emission compliant).. Beta 20. Beta 20hp – 3 Cylinder. Naturally aspirated, diesel propulsion engine developing 20 hp at 3,600 rpm with a swept volume of 719 cc.. We work out the trending price by crunching the data on the product’s sale price over the last 90 days. New refers to a brand-new, unused, unopened, undamaged item, while Used refers to an item that has been used previously.. Beta 20 BD722 This is a listing of items that are suitable for fitting to Beta Marine 20 BD722 engines, subject to application. We hope this page will help you; if you don't see what you are looking for, please contact us .. . .