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lyraboat
lyraboat

Posted: Wed Mar 02, 2011 4:05pm

Post Subject: altenator

I have Vetus M4.17. In an effort to improve the charge rate from the alternator I have fitted a Sterling controller. While this does work after a fashion the problem is that a canal speeds, 1000 - 1100 RPM the alternator doesn't do much and must be revved to about 1500 to get a good charge. I hope to increase the size of the engine pulley to improve the speed of the alternator but I understand that the rev counter is driven from the alternator which will make it read high. Is this correct and is there a solution? Looking forward to your help, Regards Bob Hawkins

Tony-B
Tony-B

Posted: Wed Mar 02, 2011 6:08pm

Post Subject: altenator

The rev-counter problem is easy to fix providing you have or can get a set of instructions but before you jump in I would suggest that you check the maximum speed you can drive the engine water pump because a larger engine pulley may well drive the pump beyond its design speed when running hard on rivers and such like. I would advise that you contact a number of autoelectrical specialists with a view to seeing of a smaller alternator pulley is available. However you would need to use a notched (toothed) belt to get it to wrap on a smaller pulley. You may already be using a notched belt. Most modern revcounters have some form of adjustment on the back. It may be a set of miniature switches, a push button or screw. This adjusts the display to show the correct speed for the number of pulses it is getting. So note the speed on warm idle. Fit the new pulley and then adjust the speed to show the previous warm idle speed. Tony Brooks

lyraboat
lyraboat

Posted: Thu Mar 03, 2011 3:10pm

Post Subject: altenator

Thanks Tony I haven't looked at the rev counter yet but that sounds a good way to go. I do know about the water pump problem, but assume because the engine is capable of 4000 RPM in its normal daily use on land that the pump will stand a few more RPM. Bob

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