Forgot to mention, I bypassed the in-line fuel filter prior to the previous tests. I replaced it this spring but wanted to eliminate it a source of fuel starvation.
Over propped?
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Originally posted by rickinnj View PostUnder load:
Forward full throttle is 980rpm and steady 2 inHg .
Astern full throttle is 1125 rpm and a steady 2inHg.
At 2" I would get over 2,000 RPM unless the prop is badly fouled.
Also, you may want a snubber for the vacuum gauge so it doesn't jump around.Joe Della Barba
Coquina
C&C 35 MK I
Maryland USA
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Confirmed firing order. Changed cap and rotor…cap terminals were burnt and pitted.
In idle vacuum smoothed out considerably at 15”Hg.
Full throttle in forward still 980 but vacuum improved to 3”Hg.
Vacuum drops to 13”Hg at 2500rpm
Progress!Last edited by rickinnj; 10-09-2021, 01:49 PM.Rick Bushie
s/v Anchovy, 1971 C&C 30-1, Hull #1
Tolchester, MD
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!!!!!!!!!!!!!!!!!!!BRAND NEW DEVELOPMENT!!!!!!!!!!!!!!!!!!!!!
After I put the ignition system back together I started the motor and ran her in gear at full throttle. Same top shaft speed of 980rpm.
All of a sudden, she sped up so much that I thought it popped out of gear (I didn’t have time to get a shaft speed but I was moving water out from under the back of the boat…the prop was spinning). About 5 seconds later it bogged down again. I checked shaft speed and she was turning 1000-1150rpm.
Something is definitely binding. What’s next?Rick Bushie
s/v Anchovy, 1971 C&C 30-1, Hull #1
Tolchester, MD
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Originally posted by rickinnj View Post!!!!!!!!!!!!!!!!!!!BRAND NEW DEVELOPMENT!!!!!!!!!!!!!!!!!!!!!
All of a sudden, she sped up so much that I thought it popped out of gear (I didn’t have time to get a shaft speed but I was moving water out from under the back of the boat…the prop was spinning). About 5 seconds later it bogged down again. I checked shaft speed and she was turning 1000-1150rpm.
Something is definitely binding. What’s next?
ex TRUE GRIT
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Rick, when she revved up and was moving water was there a difference in sound?
Sooty plugs can be caused by an over rich load situation or back pressure in the exhaust. First how old is the exhaust? And the last time it was replaced was the exhaust hose replaced? The hose can collapse on the inside causing a restriction and pop open occasionally with an increase in performance while open. Did you run the engine with the exhaust unhooked under load?
I doubt it is the carb as you changed the jet and should of noticed any debris in the bowl.
Dave Neptune
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Last week during troubleshooting I pulled the exhaust off of the manifold and ran it. No change in performance.
I took the boat for a spin this afternoon I achieved 4.7 kts SOG both directions along the fairway in the marina. 1250rpm.
Then I went for a sail 15-20out of the NE with 25 gusts.Rick Bushie
s/v Anchovy, 1971 C&C 30-1, Hull #1
Tolchester, MD
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