| Author |
Message |
    
B-Man
Member
Username: belliswood
Post Number: 14
Registered: 06-2009
| | Posted on Friday, October 23, 2009 - 09:00 am: | 
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Got new rebuilt engines in boat and the port engine runs great but the starboard acks like it has a govener on it. 2900 rpm and no higher even with more throttle. carbs are opening up full, plenty of fuel and no ignition problems. mechanic is scratching his head. any thoughts !!!!!!!!!!!! |
diver dave
Advanced Member
Username: diver_dave
Post Number: 472
Registered: 08-2008
| | Posted on Friday, October 23, 2009 - 09:30 am: |
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Verify 28 deg BTDC spark at WOT. DId you gauge the fuel line at carb to measure pressure at WOT as well? Prop clean? |
makomark
Senior Member
Username: makomark
Post Number: 1740
Registered: 09-2008
| | Posted on Friday, October 23, 2009 - 11:55 am: |
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All I can add is to verify the throttle blades open fully with engine off. If the Q-jet is still on, remove the flame arrester and poke the air valve open so you can see the secondaries. |
B-Man
Member
Username: belliswood
Post Number: 15
Registered: 06-2009
| | Posted on Friday, October 23, 2009 - 12:07 pm: |
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what kind of fuel pressure should there be at WOT? |
diver dave
Advanced Member
Username: diver_dave
Post Number: 474
Registered: 08-2008
| | Posted on Friday, October 23, 2009 - 04:05 pm: |
|
4 to 6 psi, i'd say. Are all cylinders firing? Test by removing a single plug wire at a time at idle. A digital tach or good ear makes it a bit easier. |
makomark
Senior Member
Username: makomark
Post Number: 1753
Registered: 09-2008
| | Posted on Friday, October 23, 2009 - 10:09 pm: |
|
my references spec the pump at 1800 rpm with the pressures Dave cited. if it can maintain 4psi at WOT, I'd say it is in real good shape. |
