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Author Topic:   Finding Gear Ratio
DillonBW posted 05-17-2004 10:35 PM ET (US)   Profile for DillonBW   Send Email to DillonBW  
I have a 1989 Johnson 60-HP TLC--[huh?]. I know what its [crankshaft speed in RPM is], how much it weighs, prop size, fuel consumption, plug gap. etc.But I am stumped to know what its gear ratio is.
It still runs like a trai [huh?]. Loud, a little smokey, VRO disconected, twitches at idle, but she gets us where we want to go!

Any help on the gear issue [codeword] will be wondeful.
Thanks guys and ladies

Moe posted 05-17-2004 11:52 PM ET (US)     Profile for Moe  Send Email to Moe     
Make sure the key isn't in the ignition. Put the motor in gear. Remove the engine cowling. Remove any cover over the flywheel. Put a wrench on the flywheel and turn it slowly, counting the number and portion of turns it takes to rotate the prop one revolution. For example, mine is 2 full turns and 120 degrees or 1/3 of a turn, 2.33:1. If you know the possible gear ratios, or if you have a degree wheel, you can find the exact ratio.


DillonBW posted 05-18-2004 08:46 AM ET (US)     Profile for DillonBW  Send Email to DillonBW     
Thanks Moe, will try that when I get home.
I have a feeling it is a similar number, or some where around that number. I can try out the Prop Calculator with a bit more confidence and accuracy then.
Lil Whaler Lover posted 05-18-2004 04:20 PM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
The engine in question should have 12/29 gears, or a reduction of 2.42.

jimh posted 05-18-2004 10:56 PM ET (US)     Profile for jimh  Send Email to jimh     
If you want to look up the gear ratio, see the owner's manual.

If you want to deduce the gear ratio, try the technique suggested. To get greater accuracy use several rotations and average out any error.

What is a "trai"?


DillonBW posted 05-19-2004 11:06 AM ET (US)     Profile for DillonBW  Send Email to DillonBW     
Sorry Jimh, my fingers work faster than my brain some days.
Should read, " ..runs like a train, loud and smokey."
My handbook tells me everything else, such as it being a 60hp Johnson 3 cylinder TLC (as appossed to an ELC),in English an Spanish, but not the gear ratio.
But who needs manuals when we have this incredible and spectacular web site.
Great job sir.
Thanks to all.
DillonBW posted 05-19-2004 11:09 AM ET (US)     Profile for DillonBW  Send Email to DillonBW     
See, I hit submit before I proof read... again!
To continue, I have no idea what TLC or ELC means. It is in the engine serial number and also the model name.
If anyone has any ideas.....?

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