WOT RPM for 4.3lx mercruiser?

[fishingdan]

Hi,

I picked up a nice used boat and just spent a week on the water with it. It is a 19' Cobia bowrider. What is the recommended WOT rpm for the 4.3lx mercruiser? The boat is in great shape and came with two new props. They are AL 4-blade solas 14x21 props. Without knowing the recommended WOT rpms, I didn't want to push it. At 4500 rpm, there was still a good amount of throttle remaining and the boat averaged between 45 and 47 mph with our typical load per gps (60 per the fishfinder speedo!!! LOL).

Never had a 4 blade prop before. The boat gets out of the hole great. The previous owner installed a stingray hydrofoil which certainly helps get the boat out of the hole quickly. On the next outing, I plan to remove the hydrofoil and see how she runs. The previous owner installed it when the boat was new because he "always runs a boat with one".

Thanks

 

[Don S]

Re: WOT RPM for 4.3lx mercruiser?

What year is this 4.3LX

 

[fishingdan]

Re: WOT RPM for 4.3lx mercruiser?

I believe it is a 2000. I'd have to look at the paper work to know.

 

[Don S]

Re: WOT RPM for 4.3lx mercruiser?

Oh Great!!!!!! Merc didn't make any LX models after 97. Might want to get the Mercruiser SN off your engine.

 

[fishingdan]

Re: WOT RPM for 4.3lx mercruiser?

Maybe I will do that.

The boats a 1991, the engine was replaced in 2000. Don't know if it was a re-manufactured engine or other. I'll take a look at reply here.

Thanks

 

[dredd]

Re: WOT RPM for 4.3lx mercruiser?

What year is this 4.3LX

Can you tell me the answer for a '93, please?

Seems like everyone says 45-4800 for this size engine but mine gets up to 5500 and doesn't seem like it's about to throw a rod or anything.

 

[Don S]

Re: WOT RPM for 4.3lx mercruiser?

Can you tell me the answer for a '93, please?

Sure I can, but you have to start your own thread. It's not recommended to ask your question at the end of someone elses 2 year old thread. Most people answer the original quiestion and miss yours completely/