Air intake 1975 20 hp

OldCoyote

Cadet
Joined
Aug 13, 2020
Messages
13
I have been working on an older evinrude and I’m curious about something. There’s no opening anywhere on the cover for air intake. How does this engine get air when running?
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,819
Take a very good look at the lower cowling.-----The motor is nearly 50 years old.-----I am sure there is a way for air to get in.-----Otherwise it would have been modified many years ago.
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
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28,224
Yep, I have often wondered the same thing. Just rest assured that it does get plenty of air, and there is no problem. They made many thousands of those and similar models.
 

racerone

Supreme Mariner
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Dec 28, 2013
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37,819
Just looked at some similar lower cowlings.----Plenty of places for air to get in.-----What is the motor doing / not doing that leads you to believe there is an air restriction ???
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Often a hole in the bottom front of the lower cowling. I've always thought that was for air, but could be wrong -- suppose it could also be a drain, but the possibilities there seem a little worrisome.
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,224
There is a foam seal between the lower cowl and exhaust housing. That probably is open cell foam allowing air to pass through. (??)
 
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