Tohatsu 18 HP Prop Pitch

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Tech issue :

The standard factory prop for this model is 9 pitch with 9-1/4" diameter, there's also pitch 8 & 10 with same 9-1/4" diameters. Wich one will have higher rpm's compared to standard 9 pitch, 8 or 10 pitch ? Advise please.

Happy Boating
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: Tohatsu 18 HP Prop Pitch

This is really a question for the prop section. The 8" will have higher rpm.than the 9.
Is there a problem you are trying to solve?If you post in the prop section after reading the stickies at the top of the prop forum we can surely help you.
 

Sea Rider

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Sep 20, 2008
Messages
12,345
Re: Tohatsu 18 HP Prop Pitch

Sorry for posting wrongly, just wanted to know adjacent number prop rpm's differences from 9 factory delivered, anyway, a tacho must be placed to test and get the best performance of each boat/engine configuration, thanks.

Happy Boating
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: Tohatsu 18 HP Prop Pitch

Sorry for posting wrongly, just wanted to know adjacent number prop rpm's differences from 9 factory delivered, anyway, a tacho must be placed to test and get the best performance of each boat/engine configuration, thanks.

Happy Boating

No appology needed you would just get a quicker more detailed result in the prop section.
If you want to add a tach; check into the TinyTach.Reasonable and easy to install.And will fit any similar motor regardless of stator poles.
Usually a 1" pitch change will make "about" a 200 rpm change.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Re: Tohatsu 18 HP Prop Pitch

No appology needed you would just get a quicker more detailed result in the prop section.
If you want to add a tach; check into the TinyTach.Reasonable and easy to install.And will fit any similar motor regardless of stator poles.
Usually a 1" pitch change will make "about" a 200 rpm change.

Have a Tiny Tach installed somo months ago, the issue is that the model delivered is for another type of engine shows almost double rpm than normal, kept used hours works ok, will get the right one for 2 strokes. About the prop inquiry just wanted to be sure which pitch number has less/more rpm in case heading for the max wot rpm. Thanks!

Happy Boating
 
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