muffler

[dvrdwn]

I have a 79 55hp johnson and the muffler is gone. does it make a big differance on the noise?

 

[R.Johnson]

Re: muffler

What muffler?

 

[dvrdwn]

Re: muffler

I was woundering if that was the correct name for it. In retrospect It's an air filter or something. It's a "box" that goes on the carbs.

 

[bktheking]

Re: muffler

It an air box and yes it should be there.

 

[dvrdwn]

Re: muffler

Is it something I should be concerned about not having.

 

[kenmyfam]

Re: muffler

Is it something I should be concerned about not having.

In my opinion Yes, If it did not need one they would not fit them when they were new.

 

[bktheking]

Re: muffler

Boat motors run in a dust free environment so no filter required. I'm thinking they put the air box on to minimize the chance of sucking on object directly into the carb, other than that I can't see them serving any other pupose, they run fine without one.

 

[coolguy147]

Re: muffler

make the sucking of air noise less and the whistling at low idle

 

[R.Johnson]

Re: muffler

There are several engine's that you want that air box in place. You can lean the engine out to a serious degree with out it. The larger looper's are in this class.

 

[Faztbullet]

Re: muffler

A airbox does 3 things:
1) Keeps large debris from entering engine thru carbs
2) Reduces reed noise so engine tad less noisy to customer
3) Adds a slight restriction to airflow, without out it it runs a tad leaner on top end (quickest way to blow up a V-6 looper)

 

[F_R]

Re: muffler

A airbox does 4 things:
1) Keeps large debris from entering engine thru carbs
2) Reduces reed noise so engine tad less noisy to customer
3) Adds a slight restriction to airflow, without out it it runs a tad leaner on top end (quickest way to blow up a V-6 looper)

In addition, the motor is tuned for maximum performance by making use of sound waves, both at the exhaust and the intake. Even if all else were equal (it isn't), I don't know of anyone that isn't looking for that 5hp at the top end.

 

[peterskeeter]

Re: muffler

It is important! It is an air silencer but also deflects a potential backfire flame from catching fire to your engine and boat. I know it is a small chance, but there is still a chance and potential hazard without it.