ram air on an outboard?

[87blf125]

i just had a thought, my brother has an evinrude 115. i think it is from the late 70's. i was wondering if you could build a ram air set up on that for more power like on a car? this was just an idea that poped in my head and i wanted to know if anyone had any thoughts on it?

 

[levi_tsk]

Re: ram air on an outboard?

sounds like you want to hydro lock your motor to me...... if you put a scoop on your cowl youll only be begging to suck water into your engine on the first good wave to splash over your boat. besides the increase in air pressure would be so minscule that you would never know that you did it AND AND AND youd create more drag than you would power because below 200mph ram air does nothing and while cool air MIGHT help you make another half a HP cold water will only make your marine mechanic very happy and you VERY sad

 

[G DANE]

Re: ram air on an outboard?

Inovation is always good. However I think the expected gain will never occur here. Carbed motors pull fuel in by the vacuum that is created in the intake, bu the motors suction. If you produce a positive pressure in intake, motor will have a hard time getting fuel. On Injected engines, however it is true, that any extra loading of air/fuel misture, will ad to performance. Used on many motorbikes thru the times. Good thought.

 

[boobie]

Re: ram air on an outboard?

"Sleeping dogs should be left to lie"

 

[5150abf]

Re: ram air on an outboard?

Don;t know that it woudl ever go fast enogh to ram the air in the engine and with more air you need more fuel so you run into fuel problems when you aren't ramming air.

It could maybe be done but not easy and probably not likely to work either.

 

[watergecko]

Re: ram air on an outboard?

Maybe a turbo charger that runs off the exhaust side??? It would require substantial fabrication and machining steps but might be neat pet project if ya got 5 yrs or so....Although the lowerend would take a pounding, propping it right would be a nightmare and you would cavitate so badly u might not go anywhere snapped driveshaft waiting to happen. Nevermind, only in fantasyland.

 

[F_R]

Re: ram air on an outboard?

That motor already has tuned exhaust, which works along with the tuned intake. You would have to be a very talented engineer to get much more power out of it than it already makes. Your efforts would be better spent on boat setup and props. With careful work, you might get another couple of miles per hour out of it.

 

[DJ]

Re: ram air on an outboard?

That motor already has tuned exhaust, which works along with the tuned intake. You would have to be a very talented engineer to get much more power out of it than it already makes. Your efforts would be better spent on boat setup and props. With careful work, you might get another couple of miles per hour out of it.

Ditto!

 

[Faztbullet]

Re: ram air on an outboard?

We had one of these we ran on our weekend race boat and worked pretty good except for blowing exhaust gaskets. Ran 114 mph on radar gun and it was a STOCK motor!!!!

 

[87blf125]

Re: ram air on an outboard?

thanks for imput on my idea, it was just a thought and wanting to know any idea's

 

[FichtFan]

Re: ram air on an outboard?

I agree with most people here. You'd be sucking in water in no time.
On a side note, as an mechanical engineer, tuned intakes and exhausts only work at one specific RPM. The factory determines what RPM the engine will most commonly be running at and tunes the ports to that.

 

[stupiddog]

Re: ram air on an outboard?

We had one of these we ran on our weekend race boat and worked pretty good except for blowing exhaust gaskets. Ran 114 mph on radar gun and it was a STOCK motor!!!!
View attachment 79873

THAT is very cool! Would love to see more pics / video of some runs!
Scott

 

[watergecko]

Re: ram air on an outboard?

Ditto!

 

[TN-25]

Re: ram air on an outboard?

I would think that adding ram air to your outboard would also produce an annoying drone (pardon me, it's a 2-stroke V4, an annoying shriek!) You would tire of the sound very quickly.

It was a fair question though.