" I have a 1989 Tiara 3100 wit
" I have a 1989 Tiara 3100 with twinCrusader 454's, 725 hrs. My port enigne has consistently burned 25 percent more fuel than the starboard. I have owned the boat for 4 years. I do not have synchrnizers, nor fuel consumption gages. I have twin fuel tanks, each feeds a separate engine. The by-pass hose is closed.
I have had the following done in an effort to find the problem.
Compression checked (with 10 psi on all cylinders)
Timing checked
New Rochester Quadra-Jets installed
New Fuel Pumps
Props have been tuned
New plugs, new ignition wires.
I have breakerless ignition, so there are no points to change or set.
Props are 18x23. They are typically 18x21 for this set-up. The starboard engine reaches 4100 rpm wide open. The port only makes it to 3850 rpm.
There does not appear to be a problem with the running gear. When in nuetral, I can turn the prop shaft by hand more easily on the port engine than than the starboard.
There are no signs of fuel leaking.
The port engine does seem to show more exhaust than the starboard.
Although I would expect some slight difference in fuel consumption, this seems to be more than reasonable.
does anyone have any experience with this, or have a suggestion. The local marine mechanic has virtually given up. "
" I have a 1989 Tiara 3100 with twinCrusader 454's, 725 hrs. My port enigne has consistently burned 25 percent more fuel than the starboard. I have owned the boat for 4 years. I do not have synchrnizers, nor fuel consumption gages. I have twin fuel tanks, each feeds a separate engine. The by-pass hose is closed.
I have had the following done in an effort to find the problem.
Compression checked (with 10 psi on all cylinders)
Timing checked
New Rochester Quadra-Jets installed
New Fuel Pumps
Props have been tuned
New plugs, new ignition wires.
I have breakerless ignition, so there are no points to change or set.
Props are 18x23. They are typically 18x21 for this set-up. The starboard engine reaches 4100 rpm wide open. The port only makes it to 3850 rpm.
There does not appear to be a problem with the running gear. When in nuetral, I can turn the prop shaft by hand more easily on the port engine than than the starboard.
There are no signs of fuel leaking.
The port engine does seem to show more exhaust than the starboard.
Although I would expect some slight difference in fuel consumption, this seems to be more than reasonable.
does anyone have any experience with this, or have a suggestion. The local marine mechanic has virtually given up. "