Quote:
Originally Posted by keeperreaper
200 HPDI engine has been historically one of the best built engines. Light, strong, good on the go juice. They have an almost cult following on certain boating sites. I would not hesistate to throw one on a boat. Just make sure your fuel filter is 10 micron or better.
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Have you owned one?
Your comment about the 10 micron filter is laughable.
There are 5 other levels of filters in that engine, and they will (not "may") clog with time. When they do, the engine fails.
The HPDI engines were designed to run on the "ragged edge of lean" using pure gasoline. The introduction of ethanol to gas introduces dissolved contaminants (particularly from tanks with any age on them) that the filters in the engine can not handle without clogging. As they clog, the engine runs even leaner. Since the engine is already running at peak performance as lean as it can, restricting fuel and lubrication flow leads to disaster.
They are elegant engines designed for a different era. Yamaha has tried to keep them active by ramping up their maintenance schedule and filter changes........but those filters were not designed to be accessible and are not easy or inexpensive to change or clean.
You may have friends with new HPDI's on new boats and be thrilled with the performance they get........but a $17,000 engine ought to last a decade, and the HPDI isn't likely to do it for you without a lot of expense and downtime along the way.
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