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What RPM to run 120 at

  • Thread starter Michael Trawler
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Michael Trawler

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I own a 1978 34ft Marine Trade

I own a 1978 34ft Marine Trade Trawler DC with a single 120 Ford Leman I've been running at 1700rpm getting 7.5-8 kts.
what RPM should I be running at?
thanks
 
"Michael
Run it at 75% of its


"Michael
Run it at 75% of its total rpm. To find it run it at WOT for a short time 1-2 mins then figure 75% 1700 is good for fuel saving but to low to be 75%, and can hurt the engine not help it."
 
Anyone have fuel consumption f

Anyone have fuel consumption figures(gph) for rpm settings on ford lehman 120hp engines. Considering buying a trawler with the lehamn engine. Thx.
 
I'm running the same boat;

I'm running the same boat; 1979 Marine Trader Europa with a 120 Lehman. I have been running @ 1750 rpms while only cruising at about 6 kts. The prop is a 4 blade 24 X 16. I have a spare 3 blade 23 X 16. Which prop should I use? I need another knot!
Thanks - Loyd
 
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