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671 ti laws of rpm

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swalker

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I have a 86 46’ post with twin

I have a 86 46’ post with twin 6-71 ti 450 hp they run well a little black smoke at cruse.
Top rpm 2050 . clean bottom clean airsep intake new filters fresh fuel .what is the next step to rpm increase
 
This boat is new to me and has

This boat is new to me and has never made full rpm. The port engine shows a little black smoke and a bit weaker. 2050 rpm the starboard is nice and clear stronger.2175 rpm both run well.

I haven’t tried max rpm in neutral. What should I read ????
 
"671 TI SHOULD SPOOL UP 2500 R

"671 TI SHOULD SPOOL UP 2500 RPM UNDER LOAD...BLACK SMOKE PROPABLY MEAN MUCH HOTTER EXHAUST...YOUR ENGINES WORKING TOO HARD AND TOO MUCH HEAT ON THE HEAD ISNT A GOOD THING....U NEED TO CHECK COMPRESSION, INJECTORS, AND PROPS TO GET HER TO SPOOL UP 2500RPM....TOUGH ENGINES BUT TOO MUCH HEAT ON THAT HEAD IS BAD...."
 
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