exahust bellow ??

[LEROYDOZOIS]

what is the difference beteween having an exahust bellow and a straight piece on hose???

im talking about the bellow leading off of the exahuse manifold riser....

LeRoy

 

[NHGuy]

Re: exahust bellow ??

What engine & drive do you have?
I am by no means the expert some on here are, but I can infer a possible answer to your question.
Just beyond the exhaust riser on my Mercruiser are rubber exhaust tubes and elbows to take the exhaust down to the transom outlet.
On this I/O there is an exhaust bellows between the transom & the outdrive. It carries exhaust gasses to the lower unit where they exit through the propeller hub.
I guess I am splitting hairs but to me a bellows has folds so it can bend and flex.

 

[captmello]

Re: exahust bellow ??

The exhaust bellows needs to flex when you turn and it streches when you raise the drive.

 

[fishinpa]

Re: exahust bellow ??

what is the difference beteween having an exahust bellow and a straight piece on hose???

im talking about the bellow leading off of the exahuse manifold riser....

LeRoy

Question still not very clear!
You are talking in the engine compartment ?


fish

 

[mkast]

Re: exahust bellow ??

No difference between the two.
Bellows located between the transom and the sterndrive.

 

[CharlieB]

Re: exahust bellow ??

what is the difference beteween having an exahust bellow and a straight piece on hose???

im talking about the bellow leading off of the exahuse manifold riser....

LeRoy

The exhaust 'bellows' (hose) between the exhaust manifold riser and the exhaust down pipe has more 'flex' capability than straight 'hose' to allow for the vibration of the engine motor mounts and the alignment differences to the transom plate.

 

[TilliamWe]

Re: exahust bellow ??

what is the difference beteween having an exahust bellow and a straight piece on hose???

im talking about the bellow leading off of the exahuse manifold riser....

LeRoy

As the responses you are getting are telling, you are using incorrect terminology. The ONLY exhaust bellows you should have on your boat is betweent he transom plate and the outdrive, outside the boat. Everything else is an exhaust hose.

Still I have NO IDEA what you mean in regards to the exhaust hose coming off the riser. It's either a hose that leads straight to the back of the boat for thru hull exhaust, or it connects to an elbow that turns down to connect for through drive exhaust. What are you talking about? Got any pictures?

 

[a70eliminator]

Re: exahust bellow ??

It clear to me he's talking about the hose off the riser, it's not a bellows at all rather just a piece of high temp. rubber hose.

 

[TilliamWe]

Re: exahust bellow ??

It clear to me he's talking about the hose off the riser, it's not a bellows at all rather just a piece of high temp. rubber hose.

So it's clear to you that he doesn't know what the word "bellows" means?!

 

[CharlieB]

Re: exahust bellow ??

To clarify a little.

Straight walled exhaust hose is NOT what is used from the exhaust riser to the down pipe, it may be called an exhaust hose in the parts manuals but it most definitely is NOT the straight walled exhaust hose commonly used to connect straight exhaust paths as in ski boats.

The short hose commonly used by Merc, OMC, Volvo ARE actually a 'bellows' in that the belled center section is designed to allow 'flex' in the hose to allow for any mis-alignment of the exhaust manifold/riser to the down pipe AND the vibrational differences between the motor and the transom.

Some I/O models did use short straight hoses between the exhaust riser and down pipe MAY be straight and in those applications a section of the straight walled hose may be substituted.

 

[LEROYDOZOIS]

Re: exahust bellow ??

whether any of the comments above were used to be negitive or not im simply asking because in a video i watched the guy cut the outdrive (bellow) *what i saw was a bumpy hose that was rather thin and had a wire structure * ( i know what they look like)

now what im asking is does this hose have a special name or a special purpose being it has a large bulb in it ?!?!?!?!?!?!

it leads to a large tube heading out of the boat (so it doesnt need to flex any)


i guess im sorry for the beginner lingo but i thought this site was for helping eachother out (kinda like someone in my shoes ).....

the picture i took of the pipe the hose leads to wasnt in the kb range to post (i would have had to buture the picture to death )

LeRoy...

 

[TilliamWe]

Re: exahust bellow ??

Well, that may be a flexible hose, but it certainly is not a "bellows". Not by the one for a fireplace definition, nor the one outside the boat connecting the transom to the drive.
I can only guess that that hose is shaped like that to allow it to flex a little during installation. Getting the hoses on the exhaust manifolds, elbows, and y-pipe after a removal can be a bear. maybe that helps?

 

[LEROYDOZOIS]

Re: exahust bellow ??

Well, that may be a flexible hose, but it certainly is not a "bellows". Not by the one for a fireplace definition, nor the one outside the boat connecting the transom to the drive.
I can only guess that that hose is shaped like that to allow it to flex a little during installation. Getting the hoses on the exhaust manifolds, elbows, and y-pipe after a removal can be a bear. maybe that helps?

alrighty

kinda thought it was to allow give in either installation (like you said) or maybe it was something like to absorb some "umph" being its an exahust hose

thanks for the help pal

 

[tbear1964]

Re: exahust bellow ??

That is commonly called and exhaust hose, and is located in the engine compartment. It attaches to the end of the riser off the manifold to the exhaust pipe (Y pipe if it's a V-6 or V-8) The reason it's flexible and has that large molded bulb in it is for engine vibration. The exhaust pipe doesn't move and the engine does. A straight piece of hose might work, but there's a good chance it'll tear off. Not worth it, IMO.

You'll probably have to remove the riser to install, unless you have alot of clearance.

 

["G"]

Re: exahust bellow ??

Call that section of rubber what you want... If you don't have a exhaust flapper in the exhaust somewhere you will end up sucking water into the engine on a "hiccup". That's an almost certain lock up or engine destruction.
Then your "section of rubber" (be it the bellows or exhaust hose) won't make a hill of beans what you call it.

Usually an exhaust hose is used inside the boat to connect the elbow to the exhaust tube that leads to the drive... I have seen the old 140-165's with that "bellows" look. The V8's had the straight hose as I recall.

The exhaust bellows on Mercruiser is that external hose/part from the exhaust outlet to the drive. It's the one just below the U-joint bellows. They used to be connected on both ends (Gimbel housing and sterndrive) now it's just attached to the gimbel housing.

The term "Bellows" is indicative of a flexible hose per se'.
The exact name of the hoses/bellows aside... make sure that you have a flapper in the exhaust somewhere. THAT is what counts.

Hope that helps.

 

[Don S]

Re: exahust bellow ??

 

[TilliamWe]

Re: exahust bellow ??

So even Mercruiser doesn't know the true definition of a bellows? Brilliant!

 

[LEROYDOZOIS]

Re: exahust bellow ??

So even Mercruiser doesn't know the true definition of a bellows? Brilliant!

im glad to see someone knows why i posted this

http://bpi.ebasicpower.com/pc/MER45...s,+Mercruiser+120,+160+HP+Inline+Engines:eek:

 

[fishrdan]

Re: exahust bellow ??

Hey Leroy, check your PM's (private message)

 

[Don S]

Re: exahust bellow ??

Your question was answered early in this thread by CharlieB.

The exhaust 'bellows' (hose) between the exhaust manifold riser and the exhaust down pipe has more 'flex' capability than straight 'hose' to allow for the vibration of the engine motor mounts and the alignment differences to the transom plate.