We installed (ourselves) a 37.5 HP Phasor
engine with the ZF/Hurth 150A downangle
transmission several years ago in our 1975
Alberg 37 Yawl. The
engine is 4 cyl and is relatively quiet and very smooth (compared with the original 25HP
Volvo MD-2B). Beta sells the same engine - not sure what trans they use. The only problem we had was with the
transmission which after about 300 hours was very reluctant to go into forward
gear.
Hurth gave us a new trans and it seems to be OK. Only limit on the engine is that Phasor provides a crankshaft pulley with only a 3/8" groove which limits the size of the
alternator (we have the 'optional'
Balmar 70-80 (80 amp)
alternator which is about the largest size you can use with the small belt. Phasor says that's the limit due to the
water pump cannot take much more tension. We always have some black dust around the front of the engine even though we've ensured proper alignment, and we keep the belt REALLY tight.
Beta marine engines are equipped with a multigroove (microgroove - like the serpentine belt on your car) pulley system for the crank and
water pump (Balmar has the same groove option for their alternators) which might allow better belt traction. The Phasor makes a neat and compact
installation for those with small engine compartments. Engine
parts are available at Kubota dealers - The only thing Phasor supplies is the
heat exchanger system. Our engine has the
salt water pump (Oberdorfer) installed on the accessory drive underneath and to the rear of the
injector pump, although Phasor now provides the
pump on an accessory drive on the front of the engine. To make a long story short, we are satisfied with the
installation.