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| 120hp Lehman Performance Questions |
| Author |
Message |
    
John P
Member
Username: johny74
Post Number: 6
Registered: 09-2006
| | Posted on Tuesday, March 18, 2008 - 10:16 pm: | 
|
Hey Guys,
I recently bought a 25'1970 Luhrs with a custom pilot house. She has the 120hp Lehmans in there. Prop needs to be replaced because of all the dings in there. After reading the posts I realize the cruise for this engine is 1750 rpms. What cruise speed should I expect with the right prop? Is 12 knots aiming high? Does anyone know of a good prop guy on the east coast? New York if possible? The engine runs great, oil gauge stays at 40lbs and temp doesn't go over 160. I am assuming this is all good? Any tips on this engine for peak performance? Thank You all in advance!!! |
greg lilienthal
Member
Username: glilienthal
Post Number: 14
Registered: 08-2006
| | Posted on Wednesday, March 19, 2008 - 11:18 am: |
|
Hello, 1800 rpm cruising speed is 6 to 7 knots due to the length of the boat. 12 is aiming high.
Regards,
Greg
www.bomacmarine.com |
John P
Member
Username: johny74
Post Number: 10
Registered: 09-2006
| | Posted on Wednesday, March 19, 2008 - 06:04 pm: |
|
Thanks Greg, for both answers!!! |
greg lilienthal
Member
Username: glilienthal
Post Number: 15
Registered: 08-2006
| | Posted on Wednesday, March 19, 2008 - 06:09 pm: |
|
YOU ARE WELCOMED, ANY TIME. |
Peter F
Visitor
| | Posted on Tuesday, May 27, 2008 - 09:26 am: |
|
I,m thinking of purchasing a 36' Island Gypsy with 2 x Ford Lehman 120HP engines. Does anyone have an idea what sort of fuel consumption I can expect? |
greg lilienthal
Member
Username: glilienthal
Post Number: 21
Registered: 08-2006
| | Posted on Tuesday, May 27, 2008 - 11:39 am: |
|
Yes, 3 to 3.5 gals per hr at 1800 rpms.
Regards,
Greg
www.bomacmarine.com |
Fred Frog
Member
Username: lilypad
Post Number: 23
Registered: 01-2008
| | Posted on Tuesday, May 27, 2008 - 01:48 pm: |
|
My 40' TT with a single 120 Lehman, burns 2.1 GPH @ 1750 RPM. This is per the FloScan meter and approx. 1000 gallons of fuel. The boat makes 7.0 knots at this RPM.
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