T
Tom Baglini
Guest
"I have a 1989 454/350 with ~8
"I have a 1989 454/350 with ~800 hrs, that runs perfectly from starting through the RPM range until you reach about 3000-3100 RPM. At this speed, the engine 'surges' and will go no faster. No backfiring, popping, stuttering...just surging. You can watch the tach stay stable at 3k, but just a little faster and can see the tach jump up about 100 or so rpm, then back to the 3k.
Let me explain my 'meaning' of surging. By this I mean that the engine stays strong at all speeds up to about 3000 rpm, and 'wants' to go faster. The engine does not go to 3000 rpm and 'want' to die off, then speed up.
Ok, to me it seems like fuel. I find it strange that at this particular speed an issue arises. There are no noises in the engine, it is tight, strong, no leaks, etc. I guess I am leaning toward a carburater/linkage issue? Perhaps this is just about the time when the two larger barrels are begining to open?
I intend on checking the fuel delivery system from filters, pump and finally carb. Maybe swap carb with other engine and see if the problem follows carb....I also plan on checking the plugs/wires/distributer-advance. Beyond this, does anyone have any other suggestions? I won't have another chance to get to the boat until next weekend so I thought I'd put out this post. Any help/suggestions will be much appreciated/welcomed!
I have not done compressions on this engine, but have no real reason (in my mind) to think this would be necessary at this point. Just put the boat in the water, so bottom is clean, shafts/props are clean so no lines/barnacles..etc...also fuel is from common tank, and other engine is fine.
Thanks in advance!"
"I have a 1989 454/350 with ~800 hrs, that runs perfectly from starting through the RPM range until you reach about 3000-3100 RPM. At this speed, the engine 'surges' and will go no faster. No backfiring, popping, stuttering...just surging. You can watch the tach stay stable at 3k, but just a little faster and can see the tach jump up about 100 or so rpm, then back to the 3k.
Let me explain my 'meaning' of surging. By this I mean that the engine stays strong at all speeds up to about 3000 rpm, and 'wants' to go faster. The engine does not go to 3000 rpm and 'want' to die off, then speed up.
Ok, to me it seems like fuel. I find it strange that at this particular speed an issue arises. There are no noises in the engine, it is tight, strong, no leaks, etc. I guess I am leaning toward a carburater/linkage issue? Perhaps this is just about the time when the two larger barrels are begining to open?
I intend on checking the fuel delivery system from filters, pump and finally carb. Maybe swap carb with other engine and see if the problem follows carb....I also plan on checking the plugs/wires/distributer-advance. Beyond this, does anyone have any other suggestions? I won't have another chance to get to the boat until next weekend so I thought I'd put out this post. Any help/suggestions will be much appreciated/welcomed!
I have not done compressions on this engine, but have no real reason (in my mind) to think this would be necessary at this point. Just put the boat in the water, so bottom is clean, shafts/props are clean so no lines/barnacles..etc...also fuel is from common tank, and other engine is fine.
Thanks in advance!"