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gorgedude

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Reply with quote  #1 
Maybe this is nothing new to the veterans Etec owners out there but hull design definitely affects water flow into the low water pickups.  I have a 20' North River and running at about 2000 RPM with the engine trimmed completely in, I was over heating.  Trimming it out about 20% solved the issued.  Runs at about 175 degrees which is a bit warmer than while at a full plane but still completely within range.
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2015 North River Seahawk 20
2014 Evinrude 135 HO
PhilH12

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Reply with quote  #2 
Good deal, and thanks for the info!  In 'some' cases there are also "high flow Intakes" you can screw onto the LU to resolve water not getting into the WP as it needs.

Surely not an expert, but saw it on here.  +/- $40 delivered for the ones that fit my motor.

Phil

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20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
GEB

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Reply with quote  #3 
Quote:
Originally Posted by gorgedude
Maybe this is nothing new to the veterans Etec owners out there but hull design definitely affects water flow into the low water pickups.  I have a 20' North River and running at about 2000 RPM with the engine trimmed completely in, I was over heating.  Trimming it out about 20% solved the issued.  Runs at about 175 degrees which is a bit warmer than while at a full plane but still completely within range.


Hi,
Agreed hull design is a big influence but IMO at 2000 rpm fully trimmed in is just where the engine would be working the hardest and at 2000 rpm and Trimmed in = low forward speed = low intake water pressure also bow down = pushing wall of water = engine working hard = getting hot.
Also at 2000 rpm right on the change over point from stratified to homogeneous fuel burn and about the point where the water pressure relief valve opens. Below about 1800 ~2000 rpm thermostats control temperature, above that the PRV opens to assist which is why the temp is higher at low rpm and lower at high rpm. By trimming up about 20 % (at the same rpm) you're lifting the bow a little, wall of water is less, so a little more forward speed and as a result of that motor isn't working as hard and higher intake water pressure so engine cools of.
As Phil mentioned high volume water intake screens may help but also consider you engine's mounting height. Is the AV plate visible on top of the water's surface when up on the plane, fully trimmed out for max WOT and carrying your normal load ? If not your engine may be mounted to low which at 2000 rpm would mean lots of LU drag which would also add to engine's load and therefore heat.
Here's an interesting and informative article covering E-TEC exhaust, water and water injection. Dates from 2006, 2 years after the first E-TECs but the technology is still current.
http://members.iinet.net.au/~pauldawson/iame48-06ETEC_low.pdf
Hope this helps
GEB

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olypopper

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Reply with quote  #4 
Depending on your manufacture date, you may need a lighter pressure relief valve spring.  Your engine shouldn't need to be trimmed up to avoid overheating. On slower boats, the early 135HO engines running a 21 lbs spring had a tendency to run warm to hot.  Installation of a 19 lbs spring allows sufficient water flow to achieve proper cooling at slower speeds. 
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JSRose21

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Reply with quote  #5 
Quote:
Originally Posted by gorgedude
Maybe this is nothing new to the veterans Etec owners out there but hull design definitely affects water flow into the low water pickups.  I have a 20' North River and running at about 2000 RPM with the engine trimmed completely in, I was over heating.  Trimming it out about 20% solved the issued.  Runs at about 175 degrees which is a bit warmer than while at a full plane but still completely within range.


What year is your motor?
gorgedude

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Posts: 17
Reply with quote  #6 
Thanks for the thorough responses on this thread.  Running at 2000 rpm doesn't quite put me on a plane and I'm only at this speed when running into good size swell (good size for a 20' boat).  Engine is 2014 with about 50 hours on it.  Here is some of data gained from my NMEA guage.  River water temperature was mid 50's and SOG is affected by current.

GPHRPMTempSOGMPG
0.510001628.016.00
1.71900186+11.76.88
5.0300015728.55.70
6.3350013624.03.81
8.5400013533.83.98

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2015 North River Seahawk 20
2014 Evinrude 135 HO
JSRose21

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Posts: 11
Reply with quote  #7 
Quote:
Originally Posted by olypopper
Depending on your manufacture date, you may need a lighter pressure relief valve spring.  Your engine shouldn't need to be trimmed up to avoid overheating. On slower boats, the early 135HO engines running a 21 lbs spring had a tendency to run warm to hot.  Installation of a 19 lbs spring allows sufficient water flow to achieve proper cooling at slower speeds. 


Olypopper, you are helping me on thread to but what is the manufacturer date? Is it a specific year? Our is listed as a 2015 but was part of the dealer's fall 2014 order out for the boat show. 
PhilH12

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Reply with quote  #8 
Should be on the Motor Plate?  At least it's on my 2007.

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
JSRose21

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Reply with quote  #9 
Sorry I meant what manufacture dates needed the lighter pressure spring valve?
olypopper

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Reply with quote  #10 
"but what is the manufacturer date? Is it a specific year?"

I'm not privy to that info but your dealer can call BRP and find out what weight valve  is installed.  

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