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HELP! No top-end power once loaded....
tylermarshall posted a topic in Centurion Boat Maintenance, Performance, Troubleshooting
Hi Gang, Symptom: Once loaded for surfing (anywhere past about 1000lbs ballast) I have no top-end speed. Engine won't run much faster then 2100 rpm (about 10.5 mph). We've been trying to diagnose this issue for a while so here is where I'm at: 2005 Enzo SV230 Merc 350 MAG MPI 270 hours, Acme 1579 prop, Fresh Air Exhaust installed. Just got boat back from shop, hooked up computer and tested everything - 100% good. Fuel good, filters both changed, full tank of fresh gas and a can of Sea Foam yesterday. All plug wires checked and in the right spot. Cap and rotor had a little corrosion inside but nothing major (cleaned it our engine still purrs like a kitty with the exception of minor belt whining). Idling at dock I can run it up past 5000 rpm no prob. No load, me alone in boat it runs about 30+ mph across the water and seems fine. Have run with perfect pass active, not active, and completely disconnected (no change). It would be really nice to have more power to hit 11+ mph while surfing. If we load both sacs (2500 lbs) and have 4 heavy in-laws on board then its hopeless.... maybe 9.0 if we're lucky. Items I have not tried: 1) putting the stock Acme 515 back on the boat 2) inspecting / changing plugs 3) replacing rotor & cap 4) ??? other suggestions I am new to the Centurion family and this is our first inboard so I'm learning here. Any suggestions are greatly appreciated... but if the reality is I just have a weak engine and too much weight I'm prepared to accept that.... as far as I'm concerned 330 hp should spin that prop right out of the water load or no load????