Mercruiser 8.1 370 HP WOT RPM

[Caseclosed]

2008 34 Sundancer what is the acceptable minimum WOT RPMS for the 8.1 370 HP. I believe the range is 4200 - 4400 Thanks

 

[CliffA]

2008 34 Sundancer what is the acceptable minimum WOT RPMS for the 8.1 370 HP. I believe the range is 4200 - 4400 Thanks

is this a trick question?......if Mercruiser states the range should be 4,200 - 4,400 rpms at WOT then the minimum acceptable rpm at WOT is 4,200.....

cliff

 

[saopm]

The PDF manual I have states 4,200 a 4,600 RPM for 8.1S Horizon.

 

[Caseclosed]

Sorry I should have stated that I am getting 4140 and 4160 is his acceptable

 

[saopm]

Sorry I should have stated that I am getting 4140 and 4160 is his acceptable

Its not with in range. If it's not a mechanical issue, then could be over propped, dirty bottom, or way to much stuff on board. Good luck.

 

[juggernaut1]

My manual also states 4200 to 4600. Personally, I wouldn't want to see much less than 4500 wot rpm as the merc literature I've read states to get as close to the max wot rpm as possible when propping. The rpm you are seeing is not acceptable and is not conducive to long engine life.

 

[mnm99]

My manual says 4400-4600. States it right on the engine also.

 

[juggernaut1]

Interesting mnm, the 2006 8.1 owners manual I have is 4200 to 4600 for the 8.1s and 4400 to 4800 for the 8.1sho......you must have an 8.1ssho :grin:

 

[Hick]

How often do you guys run at wot and for how long?

 

[CliffA]

How often do you guys run at wot and for how long?

for me it is just long enough to confirm the engines can reach the specified WOT rpm range then I back down to either a good cruing speed or a slow cocktail speed....this also helps clean growth off the hull bottom....I do this every couple months....

cliff

 

[sbw1]

How often do you guys run at wot and for how long?

Twice year. In mid April when it comes out of storage, and in mid October before it goes into storage. Run it for about a minute each time and watch water temp and oil pressure.

 

[mnm99]

My manual also states 4200 to 4600. Personally, I wouldn't want to see much less than 4500 wot rpm as the merc literature I've read states to get as close to the max wot rpm as possible when propping. The rpm you are seeing is not acceptable and is not conducive to long engine life.

Yup your right, Re-read and it is 4200-4600. My WOT is right at 4600.