WOT for SBC Yamaha YEMS sterndrive

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Celeb92

Seaman Apprentice
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Oct 7, 2007
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I'm not sure if this is the best forum to post this question but the contributors to the Prop Questions always refer to WOT specs so I though it best to start here. I have a 1992 vintage 5.0 chevy powering a Yamaha sterndrive. The engine is equipped with the Yamaha YEMS system. Can anyone tell me what the WOT rpm range should be? I have prop questions but I can't ask for your advice until I know if the boat is currently operating in the proper ranges. I have searched the posts using various keywords and combinations but have not come across the WOT info. Any help would be appreciated.
 
Silvertip

Silvertip

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Sep 22, 2003
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28,762
Re: WOT for SBC Yamaha YEMS sterndrive

Probably 4400 - 4800 RPM with what you consider an average load. Call a Yamaha dealer to confirm the RPM range but these close.
 
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Celeb92

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Re: WOT for SBC Yamaha YEMS sterndrive

Thanks Silvertip. That is the range that I though would be reasonable for a marine 5.0 but I do realize that different drive manufacturers offered different engine configurations -- some "hotter" than others. Any likelihood that top-end is less than the 4800 rpm? Best of my recollection, my 21 ft Celebrity deep-V was turning about 4600 rpm WOT with a 14x19 3-blade aluminum prop. It will be late spring before I can put the boat in the water again to check this out but I'm gathering info in anticipation of that wonderful event.
 
Silvertip

Silvertip

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Re: WOT for SBC Yamaha YEMS sterndrive

Post your question over on the Mercruiser I/O forum. You'll get an answer quicker and with more accuracy.
 
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Celeb92

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Re: WOT for SBC Yamaha YEMS sterndrive

OK -- I started in Props because of the always needed WOT rpm's to address questions but I wonder if my question shouldn't go to the I/O forum. I'll post a new thread there. Again, thanks for the help.
 
Bondo

Bondo

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70,513
Re: WOT for SBC Yamaha YEMS sterndrive

was turning about 4600 rpm WOT with a 14x19 3-blade aluminum prop.
Click to expand...

Ayuh,.....

Regardless of whether Yamaha rates that 5.0l Chevy differently than Merc. or Volvo,.....

4600rpms at WOT is Still a Good place to be......
 
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