Starboard wont go over 2000rpm under load.

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Leviathon
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Starboard wont go over 2000rpm under load.

Post by Leviathon »

Racking my brain here. What are some things to check? Just one engine giving me grief. If I push past 2000rpm on throttle doesnt bog, just wont go any faster. Swapped carb, newer DUI ignition on SBC. Checked to make sure secondary air doors were opening on carb - mechanical secondaries in base (rochester). Wondering if I have a fuel restriction? Timing seem correct at 10 BTDC. Thinking it should perform same as the Port engine - but does not!
Steve and Mary Levi
1973 32' Marinette Fisherman
SBC Crusaders
El Ohssa
St. Joseph, Michigan
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Busia
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Re: Starboard wont go over 2000rpm under load.

Post by Busia »

Check that the spark advance works and the fuel filter screen at the carb inlet is clean.
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
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BlueSkye
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Re: Starboard wont go over 2000rpm under load.

Post by BlueSkye »

I was wondering if your timing was advancing properly. Mine is mechanical advance and sometimes the weights and springs get some rust.
1971 32ft Express 2x318
Seneca Lake, Erie Canal, Lake Ontario, Rideau
Fastjeff
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Re: Starboard wont go over 2000rpm under load.

Post by Fastjeff »

You can verify that yu are getting full advance with one of those new lights that allows you to dial in the advance.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
Leviathon
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Re: Starboard wont go over 2000rpm under load.

Post by Leviathon »

I need to do that with a timing light. Not sure
Steve and Mary Levi
1973 32' Marinette Fisherman
SBC Crusaders
El Ohssa
St. Joseph, Michigan
jralbert
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Re: Starboard wont go over 2000rpm under load.

Post by jralbert »

One item I always suggest checking/replacing when engine "won't go over..." is the CG 11` filter found at the mouth of the carbs. If that little bugger clogs a little, the engines won't get enough fuel. Typically, though, it manifests itself as a coughing, chugging, stalling - not as you describe "just won't go". But this is food for thought
-joel-
former owner 1988 '32 FB Sedan
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twin 318 / 240 hp
Potomac MD
Fastjeff
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Re: Starboard wont go over 2000rpm under load.

Post by Fastjeff »

The way these indicting timing lights work is that you dial in the max advance (around 26 degrees) then rev the engine to about 4 grand. The mark should then appear to be at the zero advance point. If not, the advance isn't advancing.

Not unusual for the advance mechanism to stick in marine distributors;; and when it does, you one tends to incorrectly time the motor (at idle) with the advance partly out

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
barkleydave
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Re: Starboard wont go over 2000rpm under load.

Post by barkleydave »

Had same issue corroded cap/rotor Lzo replaced fuel filters
1987 Marinette 29 FB Sedan
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TinLizzy
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Re: Starboard wont go over 2000rpm under load.

Post by TinLizzy »

A sticky anti siphon valve on the fuel tank is another possibility. Or there could be debris clogging up the dip tube.
Rodney
1975 28 Express-Twin 350 Chevy's, SOLD
1990 32 Express-Twin 360's
Portage Canal Waterway-Upper Peninsula,Lake Superior
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