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eaglelodgemaine

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PostPosted: 21 Oct 2016, 12:45 
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Joined: 02 Jun 2015, 09:56
Posts: 390
Location: southern indiana
MrTotty wrote:
The year of the motor should not matter however, did you ever take the impeller out? If you did you would clearly notice the top end of had some shiny grind marks where metal was ground off. It's something you would not be able to miss. Here are pics of each. the shiny one is the right one for four stroke.

IMG_3767.JPG


IMG_3766.JPG



MrTotty I'd be glad to take that uncut impeller off your hands if you still have it


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PostPosted: 21 Oct 2016, 14:22 
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Joined: 08 Apr 2014, 07:59
Posts: 153
Location: SouthWest Virginia
MrTotty wrote:
The year of the motor should not matter however, did you ever take the impeller out? If you did you would clearly notice the top end of had some shiny grind marks where metal was ground off. It's something you would not be able to miss. Here are pics of each. the shiny one is the right one for four stroke.


Took the impeller off and checked it out. It has been cut back, although it is not as obvious as the one shown in your photos. The first photo below is the 4 stroke impeller alongside the 2 stroke impeller. The part numbers are identical. The second photo is a closeup of the 4 stroke impeller. I'm tempted to put the 2 stroke impeller in the new motor and find out just how much difference it would actually make.

Impellers_1.JPG


CutBack Impeller.JPG



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2011 Lowe Roughneck 1655CC - 2008 Mercury 2 Stroke 90/65 (Converted from prop 90)
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PostPosted: 21 Oct 2016, 15:32 
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Joined: 02 Jun 2015, 09:56
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Location: southern indiana
The two stroke one won't work as well in the four stroke. Your rpm will decrease at wide open throttle with the old style two stroke one in the four stroke. I wish they changed the part number and still made the old style two stroke ones.


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PostPosted: 21 Oct 2016, 19:58 

Joined: 14 Mar 2010, 21:30
Posts: 25
You have to buy a new 4 Stoke to get one since apparently they didn't know they were doing it. The one I have has to go back to the dealer. It was a warranty part and require it back.


The Cut impeller looks just like mine but instead of being ground it looks like they casted a new mold.

Ever heard any performance numbers on a 1655 with a prop?



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PostPosted: 21 Oct 2016, 22:57 
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Joined: 08 Apr 2014, 07:59
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Location: SouthWest Virginia
handyandy wrote:
The two stroke one won't work as well in the four stroke. Your rpm will decrease at wide open throttle with the old style two stroke one in the four stroke. I wish they changed the part number and still made the old style two stroke ones.


I know you're right and I probably won't go to the trouble to do it, but it would be an interesting experiment.



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PostPosted: 23 Oct 2016, 18:06 

Joined: 26 Oct 2013, 14:56
Posts: 538
Location: Ewing, NJ
Just for reference, I have a Lowe 1652 jet tunnel and with my mid 90's 60/45 Mercury 2 stroke I was getting around 28 mph upstream. I'm not sure what the rpm was or if my linkage/timing is correct at WOT because the linkage was broken when I got the motor. I don't normally run close to WOT but I found a small GPS so I did a test. The batteries died before I could get a downstream speed check.



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2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke
1993 Jetcraft 13' sprint boat with Chevy ZZ3 350 engine and Hamilton 772 jet drive
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PostPosted: 23 Oct 2016, 22:34 
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Joined: 08 Apr 2014, 07:59
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Location: SouthWest Virginia
Sounds about right. I was getting about the same speed with my 2005 Merc 60/40 2 stroke. With the 4 stroke 60/40 I'm lucky to get 26 mph upstream, usually it's around 25.



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PostPosted: 26 Oct 2016, 09:28 
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Joined: 02 Jun 2015, 09:56
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Location: southern indiana
MrTotty I'll get you a new impeller to send back to them to make merc happy if you'll hold on to that old style for me.


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PostPosted: 06 Dec 2016, 21:41 

Joined: 20 Aug 2012, 22:01
Posts: 445
Location: martinsburg, wv
LarryMc wrote:
Sounds about right. I was getting about the same speed with my 2005 Merc 60/40 2 stroke. With the 4 stroke 60/40 I'm lucky to get 26 mph upstream, usually it's around 25.


what is the weight difference between the 2 stroke and 4 stroke? that may be some of your speed missing.


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PostPosted: 07 Dec 2016, 17:44 
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Joined: 08 Apr 2014, 07:59
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Location: SouthWest Virginia
According to Mercury, the 4 stroke dry weight is 267 lbs. The 2 stroke weighs 233 lbs. Not enough weight difference to make that much difference in the speed. The 4 stroke motor is just not strong enough to run the standard 6 7/8" impeller at 5200 rpm which is what I got with the 2 stroke. Mercury had to cut the trailing edge of the impeller back in order to get the motor to rev up to 5200 rpm. I tried running my old impeller in the 4 stroke and it would only get 4900 rpm. The hole shot was a little better, but max speed was only around 24 mph in still water.



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