1980 115 johnson prop

[jeremy_nash]

I was wondering what the stock size prop is? I have looked at the prop, and didnt find it stamped onto it. I havent tried removing it to look inside the hub, and would rather not if possible. I put the question in here as it is more of a oem prop question as opposed to a what prop should I run question. thank you in advance

 

[kmarine]

Re: 1980 115 johnson prop

You will have to remove prop to see what size you have. I personally have mine scaned at a prop shop.(my local shop does not charge me for this) I have expierienced where the pitch punched into the hub was 3 inches less than what it scaned at. The scan found the prop was twisted (possibly ran in mud) not detectable from visual inspection. Your prop size and pitch is related to boat size, weight, and hull type. Whenever possible bring info about make and model of boat Max rpm of existing prop. A prop specialist can usially recomend what prop style, pitch,cup and venting options are available. Many shops allow demos to try before you buy.

 

[emdsapmgr]

Re: 1980 115 johnson prop

Up through the mid to late 70's OMC used to supply props with any new (V4) engine. In the case of a 115, a 19 pitch aluminum prop was supplied. That was thought to be a prop which, on average, would be proper for the engine and the boats that were made at the time. It was provided with the assumption that if it was not the correct prop, the dealer would swap it for the correct one in the first few days of new engine ownership. By the early 80's OMC realized that it was impossible to provide an "average" prop with the engine due to the wide combination of available props, boat lengths and weights. Any engine which was sold by that time was done so without a prop included-it was an extra charge based on boat size and customer preference (aluminum or stainless steel.)

 

[jeremy_nash]

Re: 1980 115 johnson prop

You will have to remove prop to see what size you have. I personally have mine scaned at a prop shop.(my local shop does not charge me for this) I have expierienced where the pitch punched into the hub was 3 inches less than what it scaned at. The scan found the prop was twisted (possibly ran in mud) not detectable from visual inspection. Your prop size and pitch is related to boat size, weight, and hull type. Whenever possible bring info about make and model of boat Max rpm of existing prop. A prop specialist can usially recomend what prop style, pitch,cup and venting options are available. Many shops allow demos to try before you buy.

I'm repowering a boat, but gotta get new shifter cables and stuff first, so no rpm readings or anything yet

Up through the mid to late 70's OMC used to supply props with any new (V4) engine. In the case of a 115, a 19 pitch aluminum prop was supplied. That was thought to be a prop which, on average, would be proper for the engine and the boats that were made at the time. It was provided with the assumption that if it was not the correct prop, the dealer would swap it for the correct one in the first few days of new engine ownership. By the early 80's OMC realized that it was impossible to provide an "average" prop with the engine due to the wide combination of available props, boat lengths and weights. Any engine which was sold by that time was done so without a prop included-it was an extra charge based on boat size and customer preference (aluminum or stainless steel.)

thank you, that is what I was looking for