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Adamdavid

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Posts: 25
Reply with quote  #1 
Hey fellas, proud to say I own a brand new Evinrude! 60 high output tiller 2019 Lund pro guide 1675 vhull-1080 lbs dry weight plus (outboard weight in dry weight?)- 3 27 batteries, 1 bow mt trolling motor, 20 gallons fuel, and me I'm 200 lbs.
Currently I am running Michigan Apollo 13 1/4 by 17. Wot trimmed out possibly more than I should be, 36-37 mph 5500 rpm. I am 2nd hole from top. What I don't like is the propeller will ventilate pretty badly trimmed out wide open, and also going into turns unless I trim in. Other than that the set up is excellent.
I don't feel the motor is too high, I can see the cavitation plate above the splash, and I measured it is approximately 1.5 to 2 inches above the bottom. I was thinking a viper 17 pitch 763930 would be the ticket, I also thought possibly a 19 pitch 763931 ?
Any help would be greatly appreciated
PhilH12

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Reply with quote  #2 
You're just trying to get rid of the ventilation?  Are you still gaining speed as you trim up, or does the motor speed up with no more speed gain?

Just wondering, to provide more detail to the experts.

Phil

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Adamdavid

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Reply with quote  #3 
It will continue to speed up minor .1 at a time, but it starts to feel so very squirrley at that trim angle, and I find myself worrying if it is still picking up water, as I can hear the sound of what I believe is the prop breaking the surface gurgling. Also at that high of a trim angle the boat can't really turn at all and I feel is excessive trim at that point. Yes I want to get rid of the ventilation if possible and also if there is a better prop that will give me better performance that would be ideal as well. I have a ton of hole shot top speed at this point would be the desire. This prop also has a bit of trouble staying on playing with a good bow position at slow speed's, not sure if that would be the opposite of a higher top speed?
steelhead

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Reply with quote  #4 

Too much bow lift from the Viper for a tiller boat.  Causes the "squirrelyness" handling at high speeds trimmed out.

Try a BRP SSP 3 blade or a BRP Rogue 4 blade, large blade size in both with lots of cupping for stern lift and less slip in turns and waves.  Both handle at slow troll speeds in winds better than the Viper
Stern lifters, reduces drag in water

763951 SSP 3 13 1/4” 17”

763965 Rogue™ 4 13 1/4” 15”

Adamdavid

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Posts: 25
Reply with quote  #5 
Quote:
Originally Posted by steelhead

Too much bow lift from the Viper for a tiller boat.  Causes the "squirrelyness" handling at high speeds trimmed out.

Try a BRP SSP 3 blade or a BRP Rogue 4 blade, large blade size in both with lots of cupping for stern lift and less slip in turns and waves.  Both handle at slow troll speeds in winds better than the Viper
Stern lifters, reduces drag in water

763951 SSP 3 13 1/4” 17”

763965 Rogue™ 4 13 1/4” 15”



If I go from a 17 pitch to a 19 pitch 2 inches of pitch how much RPM change should I expect in the same prop
Glenlivet

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Reply with quote  #6 
Roughly 400 rpm. Depending on various other factors like cupping of the blades etc.
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Adamdavid

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Posts: 25
Reply with quote  #7 
Also if anyone knows shouldn't I be aiming for 5200 not 5500 and if I am hitting 5600 isn't that excessive possibly damage the motor?
Please and thank you
If I am hitting 5500 to 5600 wot with a 17 pitch, shouldn't I move to a 19 pitch, and try to get it to 5200 RPM?
steelhead

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Reply with quote  #8 
Max HP on the 60HO doesn't happen until 5500 rpms.
WOT Optimum rpm range is 5500>5800 rpms.
Reline cutoff by the EMM is 6100 rpms 

Both the SSP and Rogue props have larger blades than the Viper series, thus more HP load down rpm decrease.

17P SSP and 15P Rogue will give you weight carry buffer for more than 1 person on boat.
GEB

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Reply with quote  #9 
Hi,
You’d do well to heed steelhead’s advice.
Propping the motor to ensure that at WOT it’s running within it’s Optimum Rev Range will give you best performance, fuel economy and motor longevity.
Propping the motor, with your normal load, towards the high end of the Optimum Rev Range will allow you some reserve for the occasional heavier than normal loads.
Under propped motors work hard, run hot, use more fuel, carbon up and don’t live as long as they could (when propped correctly). Under propping can cause additional problems with the motor. eg in a recent post here the OP was “spinning” prop hubs and the cause of which turned out to be over heated exhaust gases as a result of the motor being over propped.
Cheers
GEB

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Adamdavid

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Posts: 25
Reply with quote  #10 
Quote:
Originally Posted by steelhead
Max HP on the 60HO doesn't happen until 5500 rpms.
WOT Optimum rpm range is 5500>5800 rpms.
Reline cutoff by the EMM is 6100 rpms 

Both the SSP and Rogue props have larger blades than the Viper series, thus more HP load down rpm decrease.

17P SSP and 15P Rogue will give you weight carry buffer for more than 1 person on boat.

Thank you so much for this information sir, may I ask where did you get it? I have been looking for this everywhere. So I really want to be 5500 to 5800 rpm- this is very valuable. If that's the case 17 pitch is surely right. I am going to seek out the propeller you are recommending. Thank you so much for your time and energy I really appreciate it fellas.
I love this outboard, and I have noticed that it really sings at 5500, this makes sense now. The acceleration is unreal with this hull/motor !! It's hard to believe how well this combination does on a very rough sea, even going against the tide with the wind, or with the tide and against the wind-unreal. Evinrude E tec forever !
Tiller_man_I_am

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Posts: 8
Reply with quote  #11 
I may have same issue. I have a lund 1775 with 75hp tiller running a 13 7/8×17 viper. I feel boat doesnt pop out of the water as it should I have a ton of bow lift until I accelerate to almost 3/4 throttle. I do top out around 36mph loaded 38 alone and 5500-5600 rpm. Any suggestions? Motor I had was an 08 which I just repowered to a new 75hp but assume it will perform the same.
Huey

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Reply with quote  #12 
The 60HP HO is the I-3 platform like the 75HP/90HP and max RPM is 5500RPM with its sweet spot being 5200RPM at WOT with normal load. Any tiller handle boat should have a Rogue prop over a Viper every day of the week and you need to make sure you are not too low, hole no.3 is where I rig most I-3 and confirm accurate RPM.
Adamdavid

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Posts: 25
Reply with quote  #13 
Quote:
Originally Posted by Huey
The 60HP HO is the I-3 platform like the 75HP/90HP and max RPM is 5500RPM with its sweet spot being 5200RPM at WOT with normal load. Any tiller handle boat should have a Rogue prop over a Viper every day of the week and you need to make sure you are not too low, hole no.3 is where I rig most I-3 and confirm accurate RPM.

This information conflicts with 5500-5800 listed in comments above.
I am in the 2nd hole from top is that hole 3? Maybe since tiller I'm farther back so it's more stern heavy?
If I trim up I can hear gurgling, and have to trim down a lot to turn, almost all the way down.
If I go up anymore not sure if I will be hooked up at all in a turn?
So you feel I should go up from 17 to 19 to get from 5500-5600 to 5100-5200?
Or rogue with same pitch will have less rpm?
Is 5600 too high-bad for my motor?
Huey

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Reply with quote  #14 
Yes it does, believe who you like. A Rogue prop is the best prop from stern heavy boats like a tiller model and second from top would be hole no.2 and your call if you want to see about raising it. If you are certain it is accurate WOT RPM and can not comment on Apollo props or if it is even a SST prop. If you want top speed go with the 19 inch Rogue and the revs would drop a little to be around the sweet spot or stay with 17 inch if you want out of hole performance and carry big loads. If the current prop is an alloy prop, a Rogue can handle higher transom mounting heights.
steelhead

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Reply with quote  #15 
CORRECTION:
The 60HO is the lowest HP 3 cylinder model, not the water valve 60hp 2 cylinder.  The 3 cyl. class is not capable of the higher rpms of the 2 cyl and V motors.
The 3 cylinders are rare here.

Prop as Huey said.

Don't want any handling problems with a tiller boat, too easy to get ejected.  Happens all the time here with the welded low V aluminum river sleds.
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