How to Modify a Transom and Outboard Motorwell to Accept Twin Engines.

This change applies to all our plans for outboard boats that use engines between 75 and 250 HP.

Our motorwell dimensions are based on the ABYC standards and can accommodate all outboard engines manufactured after 1980. They show sufficient room for rigging and complete tilting. To adapt our plans for the installation of twin outboard engines instead of a single engine, only one dimension changes: the width of the motorwell. For a single engine, the standard width is 30" (75 cm), for twin engines it is 60" (150 cm). All other dimensions are identical. Beware of the engine bolts location: check for interference with stringers.