Our trawler has developed a surge. First occurring on the first day of our vacation it happened after running six or seven hours. Running at 2150 RPM, our normal cruising speed, the Perkins 4-107 sped up to about 2600 RPM and then immediately went back to 2150. 30 minutes later the same thing. This continued happening but on a more frequent basis and then mysteriously went away. That days journey totaled 14 and 1/2 hours underway. The surge returned almost every day. One day we cruised 6 and half hours pushing into a 4 to 6 foot head sea and the surge showed up after the first 3 hours and lasted most of remaining 3 and 1/2 hours. Once it starts it seems to come each time more frequently. Subsequently any journey of an hour or less produces the surge with increasing regularity. What is this annoying added power? I'm guessing it's fuel related but I would have thought it would die if fuel starved or ingesting air not surge ahead. Once started it also surges at lower crusing speeds (ie 1800 RMP) but not at the lower manuvering speeds. Mark & Diane Stypinski M/V Elsea 1974 Willard 30 Vega Voyager www.geocities.com/yosemite/rapids/7196 -------------------------------------------------------------------------------- ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com