johnson 110 rpms

[cpr]

hello fellow boaters.i have johnson 110 vro model#J110TLCCA its new to me about a month old.just wondering what type of rpms i should have?at wide open throttle i have 5300,and i usually back it down to 4500 or so just trying to make it easier on the old gal.motor is on an aquasport170 76 model.thanks for any help and suggestions.

 

[ob]

Re: johnson 110 rpms

cpr,Just for your info the engine is a 1988 model.Engine should be capable of 5500-5800 rpms at WOT.What pitch prop are you currently running and is it an OMC sst or other?This info will assist us in determining whether the engine is slightly overpropped for its application or if carburetion or other factors are limiting the engine rpms.

 

[cpr]

Re: johnson 110 rpms

thanks ob, ill look for numbers on prop tommorow boat is at my fathers.i know it is stainless but thats all i know.i just bought this rig june 7th. thanks again.

 

[cpr]

Re: johnson 110 rpms

ob i looked at prop today.i found 19 P stamped on it.when i measure across blade to blade its 11 1/4 inches.when i look in my cabelas book for my 110hp v-4 it list some at 13inch dia. and 19 on the pitch.could mine be this worn?thanks again for the help and advice.

 

[Solittle]

Re: johnson 110 rpms

You could take the prop to a prop shop. Stainless props can be tweaked a bit but not a lot. I wouldn't bother for 200 rpm.

 

[ob]

Re: johnson 110 rpms

If it's a 3 blade prop measure from center of hub to tip of one blade and multiply by 2.This will give you a more accurate diameter.A 110 on a 17 ft aquasport spinning a 19" pitch is sort of like being in between clubs on a golf shot.I'm thinking a 17" will get you a better hole shot and with the added rpm ,less load on engine and comparable top end.If you decide to go prop hunting it has been my experience that the OMC props are designed to best meet the torque curve needs of your engine.