Topic: Top speed with 18hp Evinrude on 14′ aluminum – Page 10

This topic has 105 replies, 22 voices, and was last updated 7 years, 9 months ago by stephenspann27.

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February 20, 2017 at 11:29 am #53320
stephenspann27
Participant
I think this powerhead had fairly low hours on it, the cross hatching in the bores is still there. Something lead to ti’s desmise, overheating or lack of lubrication. The thermostat was missing when I got the motor. Might be a clue..
February 20, 2017 at 2:23 pm #53325
garry-in-michigan
Participant
Lifetime Member
When you remove the thermostat, the water follows the path of least resistance. This means most water bypasses the water jacket making the outlet feel very cool. The motor however, is usually getting less and running very hot.. . 🙄
February 20, 2017 at 2:29 pm #53326
stephenspann27
Participant
quote Garry in Tampa:

When you remove the thermostat, the water follows the path of least resistance. This means most water bypasses the water jacket making the outlet feel very cool. The motor however, is usually getting less and running very hot.. . 🙄

Agreed, and the water flow through too fast to really draw out much heat. I put a thermostat in it before I ran it.
February 20, 2017 at 4:24 pm #53334
Mumbles
Participant
Smaller motors such as a 6 and 9.9-15 are the opposite and will run too cold without a stat and start fouling spark plugs.
February 20, 2017 at 7:28 pm #53341
stephenspann27
Participant
I wish I had a good test tank where I could put a load on the motor and watch it with a infrared gun.
February 20, 2017 at 11:27 pm #53345
jeff-register
Participant
US Member - 2 Years
Garry,
Thank you so much for the tip on the stat, I own a 58 18hp Johnson & I like it very much!
Jeff
February 20, 2017 at 11:43 pm #53346
wiscoboater
Participant
One word of warning Stephan, do not try to run at speed in a barrel or garbage can. Idle only with a couple quick jabs of throttle. Get your motor to where it will stay running in the barrel but do your tuning on the lake under load. Adjust high speed first. Then go back and re tweak the idle. Good luck with the new powerhead.

Jeff
February 26, 2017 at 2:45 pm #53570
stephenspann27
Participant
I’m able to get 19mph now with a new to me powerhead from wannabee.
February 26, 2017 at 4:59 pm #53572
Mumbles
Participant
How steep is the prop on this motor? Numbers should be under the prop nut.
February 26, 2017 at 6:51 pm #53575
stephenspann27
Participant
quote Mumbles:

How steep is the prop on this motor? Numbers should be under the prop nut.

Prop is 9×10. I’m getting about 4,300RPM. Max HP is 4,500rpm according to the cowl, but operating range is up to 5k.
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