What prop for 13' with '92 Mercury Classic 40 HP

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Author Topic:   What prop for 13' with '92 Mercury Classic 40 HP

dhormann posted 09-11-2000 04:53 PM ET (US)
I recently put a deposit on a 1992 Mercury 40 HP classic. (4 cylinder) I'm going to be putting it on my 1970 13' Sport. Does anyone run that setup, or have an idea on what prop to install?
lhg posted 09-11-2000 05:17 PM ET (US)
The Mercury prop chart indicates a 17" pitch prop, which should give you 37-43mph (probably closer to 43!) with a max total load of 1100 lbs. Try to find one in SS if possible, for best all around performance. Mercury's own brand may only be available in aluminium at 17" pitch, part # 48-73144A40.
That's a great engine you're getting. In the "old days" it was called a 50.
dhormann posted 09-11-2000 10:01 PM ET (US)
Thanks! I'm looking forward to trying it out. I'm still in the process of refinishing the brightwork, but after a long search for a motor, and finding a lot of junk, I couldn't let this one go.
Clark Roberts posted 09-12-2000 07:28 AM ET (US)
Sheriff, congratulations on the 4 cyl 40 Merc. You will love it!! I'm running a 1994 40hp on a 15 Whaler with stand-up center console and it's a dream... it goes so slow at idle speed that it's hardly moving! Who else brags about having a slow b oat???? It is so smoothe ... I'm running a 14 inch pitch Yamaha stainless prop and performance is good with two people.. now, I have had several 13's with 40 mercs and all were smoothe and fast... around 40 as I recall.. Larry is right on with his prop advice... I think the last 13 with 40 that I had was swinging a 16 " pitch stainless quicksilver (standard) prop... I hope your engine has power trim and tilt as this is necessary to fully realize the performance potential.... also with T&T you will be able to swing a higher pitch prop and topn speed will be higher (provided you can keep her in the water.. heh, heh)... Happy Whalin'.... Clark... Spruce Creek Navy
jimh posted 09-12-2000 09:22 PM ET (US)
I have the Merc500 (1976), which lhg suggests is the progenitor of your engine.
It's on the transom of my Sport-15, and I have found the Black Max 14-inch prop works well.
I have a 15-inch Black Max prop, but that seemed to be a little tall for me.
On the 13-foot hull it should be about right.
--jimh

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Author	Topic: What prop for 13' with '92 Mercury Classic 40 HP
dhormann	posted 09-11-2000 04:53 PM ET (US) I recently put a deposit on a 1992 Mercury 40 HP classic. (4 cylinder) I'm going to be putting it on my 1970 13' Sport. Does anyone run that setup, or have an idea on what prop to install?
lhg	posted 09-11-2000 05:17 PM ET (US) The Mercury prop chart indicates a 17" pitch prop, which should give you 37-43mph (probably closer to 43!) with a max total load of 1100 lbs. Try to find one in SS if possible, for best all around performance. Mercury's own brand may only be available in aluminium at 17" pitch, part # 48-73144A40. That's a great engine you're getting. In the "old days" it was called a 50.
dhormann	posted 09-11-2000 10:01 PM ET (US) Thanks! I'm looking forward to trying it out. I'm still in the process of refinishing the brightwork, but after a long search for a motor, and finding a lot of junk, I couldn't let this one go.
Clark Roberts	posted 09-12-2000 07:28 AM ET (US) Sheriff, congratulations on the 4 cyl 40 Merc. You will love it!! I'm running a 1994 40hp on a 15 Whaler with stand-up center console and it's a dream... it goes so slow at idle speed that it's hardly moving! Who else brags about having a slow b oat???? It is so smoothe ... I'm running a 14 inch pitch Yamaha stainless prop and performance is good with two people.. now, I have had several 13's with 40 mercs and all were smoothe and fast... around 40 as I recall.. Larry is right on with his prop advice... I think the last 13 with 40 that I had was swinging a 16 " pitch stainless quicksilver (standard) prop... I hope your engine has power trim and tilt as this is necessary to fully realize the performance potential.... also with T&T you will be able to swing a higher pitch prop and topn speed will be higher (provided you can keep her in the water.. heh, heh)... Happy Whalin'.... Clark... Spruce Creek Navy
jimh	posted 09-12-2000 09:22 PM ET (US) I have the Merc500 (1976), which lhg suggests is the progenitor of your engine. It's on the transom of my Sport-15, and I have found the Black Max 14-inch prop works well. I have a 15-inch Black Max prop, but that seemed to be a little tall for me. On the 13-foot hull it should be about right. --jimh