FORUM RULES UPDATED - The forum rules have been updated to continue to provide a friendly and safe environment for our member community. Please take a moment to review the updated rules and our terms of use and privacy policy. Click here for Forum Rules which has links to the 'terms of use' and 'privacy policy'.
In Other News . . .
You will notice a few enchancements to the forums to make your experience better. These include: Email Notifications, Thread Previews, Thread Starter Notation, and Emoji Options on the 'Like' icon. . .
Additionally, the merchant portions of the website have been updated and are now operational. . . . Check out iBoats for all your boating gear.
I would like to switch my 13x15 prop on 1980 140hp johnson to a 19 pitch. What kind of performance effect should i see, will it make the old girl work too hard?
If the 15 is presently the proper pitch, allowing the engine to run at the upper end of the WOT range, adding 4 inches of pitch will lower the rpm by about 800 rpm, resulting in poor holeshot and probably lower top speed. If the 15 is allowing the engine to exceed the recommend RPM then adding the 4 inches will still lower the top rpm, which might or might not bring into the recommended range. Top speed might or might not increase
