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1959 283 Tachometer off by 30%

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donald.stahl
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1959 283 Tachometer off by 30%

Post by donald.stahl » Mon Sep 07, 2020 11:15 pm

I recently bought a 1959 Ski Boat with the flywheel forward 283. Carburetor needed a complete rebuild and tune and I took care of that- but the boat did not seem to be moving as fast as I would have expected for the RPM I was seeing.

In order to fine tune the carburetor I brought out my digital timing light with tach readout only to realize that the tach in the instrument cluster is reading over by 30%. When the dash shows 1000 RPM the digital tach shows 700. When the dash shows 4000 RPM the digital tach shows just 3000.

Any idea what I should be checking to locate the source of this error? I would suspect a problem with the instrument itself but the error is identical across the boat- almost as if the wrong drive gear was installed.

Any suggestions would be appreciated.

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drrot
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Re: 1959 283 Tachometer off by 30%

Post by drrot » Tue Sep 08, 2020 7:09 am

There is an angle adapter on top of the engine. Check that. They come in different ratios. If not 1-1 it is usually marked.
Jim Staib
www.finewoodboats.com


1947 Penn Yan 12' Cartopper WXH474611
1950 Chris-Craft 22' Sportsman U-22-1532
1957 Chris-Craft 26' Sea Skiff SK-26-515
1968 Century 17' Resorter FG-68-174

donald.stahl
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Joined: Tue Sep 01, 2020 11:25 pm
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Re: 1959 283 Tachometer off by 30%

Post by donald.stahl » Tue Sep 08, 2020 8:36 pm

Yep - I'm familiar with the adapter but did not know what ratio I should find or that it would be marked. I'll check it out tomorrow.

Does anyone know what the ratio should be for this engine?

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