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Horsepower question. 48 special on a 16
Anemone	#1  Posted on 04/13/11 - 9:26 AM
Member Posts: 73 Comments: 0 Joined: 02/28/11	I know this is going to sound like a stupid question but I was wondering if anyone knows how a 48 hp will push a 16. It came on the back of the boat and I know that it is rated for up to 100hp. My debate is that I am nearing completion of the hull project and I am trying to decide whether to go ahead and put the 48 back on it because it runs well and it would save me from having to sell this one and wait around til the right 75-100 hp comes along. Then again if I go to the trouble of installing it and I can barely plane off thats gonna suck too. Anyone have any thoughts?
blacksmithdog	#2  Posted on 04/13/11 - 10:08 AM
Member Personal Page Posts: 417 Comments: 0 Joined: 06/26/06	It really depends on what you plan on doing with it. I've had a 55 on a montauk before. For cruising and fishing it did just fine. If you want to pull your 240 pound son who's a linebacker, up on a slalom ski, go for the bigger motor.
Tom W Clark	#3  Posted on 04/13/11 - 10:10 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Mounted and propped correctly, it should be good for 30-32 MPH. Be sure to fill those lower bolt holes in the transom and drill new ones higher up.
Anemone	#4  Posted on 04/13/11 - 10:38 AM
Member Posts: 73 Comments: 0 Joined: 02/28/11	Thanks guys. That is very good news. Eventually I will upgrade power but for now it is always gonna just be me, the wife, and a 4 year old heading out or fishing with a buddy. If I can cruise at 30, that is plenty enough for me. Can you elaborate on mounting it higher? It has a lip that sits on top of the transom so I just assumed that would be the proper placement. Also, how do I determine which prop pitch to go with? I have no idea what pitch is on it now.
Joe Kriz	#5  Posted on 04/13/11 - 11:24 AM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	See this article for mounting height and hole placement. http://www.whalercentral.com/articles...icle_id=82
Anemone	#6  Posted on 04/13/11 - 11:58 AM
Member Posts: 73 Comments: 0 Joined: 02/28/11	I know that when removing the engine, I removed 4 that were 4 through bolted. That would suggest that it was mounted correctly right? Can you comment on the prop pitch?
Joe Kriz	#7  Posted on 04/13/11 - 12:03 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Anemone wrote: I know that when removing the engine, I removed 4 that were 4 through bolted. That would suggest that it was mounted correctly right? No not necessarily. Your engine could be using the Blind holes and would need drilling new lower holes before raising the engine to the proper height. Did the 4 bolts all have nuts? You might measure distance between the holes you have now and compare them to the drawing. Let us know what holes you have drilled on the drawing. Engine height comes first before prop pitch choice.
Tom W Clark	#8  Posted on 04/13/11 - 12:07 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	I can almost guarantee you that the Johnson 48 was mounted using the blind holes, all the way down on the transom, and as such, it was way to low. This is why I recommend you fill those two lower holes and drill two new ones according to the article Joe has linked to. This will put four bolt holes in your transom that you can use with this motor or any other motor in the future without every again fooling with filling and drilling new bolt holes.
Tom W Clark	#9  Posted on 04/13/11 - 12:11 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	The current propeller will have its size and/or part number cast into it. You may have to remove it from the motor to read the numbers but they are there.
Anemone	#10  Posted on 04/13/11 - 12:25 PM
Member Posts: 73 Comments: 0 Joined: 02/28/11	Thanks for the great information. I will measure using the drawing this evening and report back.
Tom W Clark	#11  Posted on 04/13/11 - 12:36 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	What is the gear ratio and WOT range of your motor?
Anemone	#12  Posted on 04/13/11 - 12:43 PM
Member Posts: 73 Comments: 0 Joined: 02/28/11	I am gonna show my ignorance here and admit that I don't even know what "WOT" means. Where would I find the gear ratio? I am sure the local Johnson dealer could tell me.
Joe Kriz	#13  Posted on 04/13/11 - 12:46 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	WOT = Wide Open Throttle This is in the operators manual and is recommended not to be exceeded.
DKroger	#14  Posted on 04/13/11 - 5:33 PM
Member Personal Page Posts: 79 Comments: 1 Joined: 11/01/10	If it is a 48 spl it would have WOT of 4500-5500 rpm's and a gear ratio of 2.42:1 which is the same as the 50 hp of the same years 1987-1995 in the 2 cly. 2 strokes. 1980 13 Custom w/ 48 Evinrude DK
Tom W Clark	#15  Posted on 04/13/11 - 6:17 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	So, in other words, the same gearcase as the three cylinder 70's? Anemone -- What year is your Johnson 48 Special?
DKroger	#16  Posted on 04/13/11 - 6:28 PM
Member Personal Page Posts: 79 Comments: 1 Joined: 11/01/10	Mine is a 1987 and runs great. I don't know what year Anemone's is. 1980 13 Custom w/ 48 Evinrude DK
Anemone	#17  Posted on 04/14/11 - 6:34 AM
Member Posts: 73 Comments: 0 Joined: 02/28/11	The 48 special is a 1989. I have inadvertently intertwined the same conversation in two different areas so I apolagize if this is redundent but does anyone know if a 48 of this year has a thermostat? Edited by Anemone on 04/14/11 - 6:41 AM
djacksonrn	#18  Posted on 04/14/11 - 6:48 AM
Member Personal Page Posts: 39 Comments: 0 Joined: 01/12/11	Evinrude.com USA Online Store Parts I entered 1987 for year 48 showed this cylinder and crankcase diagram which has part #12 in the diagram listed as thermostat OMC part number 0393659 looks like it is at the base of the cylinder head.
Tom W Clark	#19  Posted on 04/14/11 - 7:13 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Well, according the parts diagrams of the 1989 48 Special, the gearcase is the 3-1/2" size, not the intermediate 4-1/4" size like the 70 HP model. It does not indicate what the gear ratio of the lower unit is. Again, if we knew what the current propeller size or part number was, we could probably figure it out from that.
Anemone	#20  Posted on 04/14/11 - 8:25 AM
Member Posts: 73 Comments: 0 Joined: 02/28/11	I will pull the prop and get the number off of it tonight. Thanks for the help!