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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 2006 Nissan Prop issue.		  New Topic  Topic Locked
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atgep
Master Marine Consultant

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1009 Posts
Initially Posted - 10/07/2005 :  23:18:52  Show Profile
I did a 35 mile break in run on the new engine and have come up with a small snag.

Above half throttle there is very little throttle response. The speed does not come up much either. I suspected the engine was over propped and the RPMS were below the reccommened 5000-6000. So... I went out and purchased a Tiny-tach. It is a self contained rpm gage and hour meter. Waterproof and battery powered, I zip tied it to the carry handle.


Now, I know the engine is under revving. At full power, I get 4600 rpm. I need a little less prop. I have a 8.5d x7.5p and am considering a 7p instead. Anyone done this to the Nissan 9.8?
The goal is not speed but rather to unload the engine slightly. Now that I know the rpm, I can plot fuel use Vs rpm . I also plan on doing a pull test on both props. I emailed Solas.com asking about the possibility of a 4 bladed prop that will fit the engine. Anyone who might me interested should do the same. They offer all sorts of specialty props and perhaps could make us a great sail-prop. Only 2 more hours to finish the breakin. I will let you know about the new prop.

Tom.
PO of 1988 Wing HN 5775
"Cote d'Azure"
Fleet 25
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frog0911
Master Marine Consultant

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USA
1349 Posts
Response Posted - 10/10/2005 :  10:12:52  Show Profile
Tom, were did you find Tiny Tach and how difficult is it to hook up? This would be a great addition on engine performance on our tiny outboards.
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 10/10/2005 :  10:48:58  Show Profile
I found it at southeast dist on Lane ave. It is available online and via ebay a little cheaper. It is self contained and self powered. There are 2 wires. The red wraps around a spark plug wire and the black goes to ground. I used a coil bolt as the ground. I ran the wireds through a rubber grommet on the port underside of the engine cowl. On mine it already had a slit.

There are several versions of this unit. I got the one that is unresettable and the one where the plug fires on every revolution.

#TT226NR-2C



Hope this helps.

Tom.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.