intake induction noise from the engine

[ianqv]

Hi All,

I have a S/O 37 with a 40hp 3 cylinder 2040 Volvo Penta engine.
In my first year of ownership I have always been surprised just how noisey the engine is.
The noise which I think is loud is the induction / air intake for the engine.
Anything over 2000rpm it sounds like a Ford Cortina with a pancake air filter fitted!!!!!!! (i.e noisey and raspy!!!).
There is nothing else wrong with the engine - just the intake noise.
This is purely down to the RUBBISH foam filter which is fitted as standard (see attached pic).

So, I have ordered today a Conicle K&N filter which will be fitted on a piece of flexible pipe.

Once fitted I will report back... and post some pics.

Best Regards

Ian

[sailbleu]

Please keep us posted Ian.
The less noise the better indeed.

Regards

[Full Circle]

Surprised you aren't fitting a Helmholtz Resonator Ian!!!:-))

[ianqv]

I did consider this - if I remember correctly early Mavericks use to have these fitted!! I had a word with the induction guys but when I mentioned it was for a boat their interest declined!!! lol
The much larger cone filter "should" cut the noise down due to it's larger surfice area and of course its shape.

But the real proof of the pudding..............

I'll keep you posted!! (either way D:) )

Ian

[ianqv]

Hi All,

As promised here's the update....

The cone K&N filter is now fitted (see attached pic).
It was mounted on to some induction flexible rubber pipe (see following posts).

The induction noise has now been reduced by about 80% < 90% - so a HUGE improvement!!

However, I may play with some Acoustic sound deadening in the pipe which runs up to the stern.

Total cost of mod 14 pounds!! (GBP) I already had the pipe.

Hope this helps

regards

Ian

[ianqv]

installation pic - apologies for quality, but was taken with my phone.

[ianqv]

Installation pic 2

If anyone would like some hi def pics - just shout!

BTW - I got the filter from Ebay.

[ianqv]

Just thought I should add the following...

By mounting the filter in this way I have lowered the induction point by 6 ish inches.
So, if I was to ever spring a big leak down below, the engine would suck up water earlier!
But to be honest, if I have water over the top of the gear box she's prob heading for Davey jones locker anyway!!

Just thought I should mention this should anyone wish to do the same mod.

Regards

Ian

[marmalade11]

Hi i have been following your article and i would like to try the same i have an md 2020 3 cylinder engine very similar just a little smaller please can you confirm the intake diameter of the k&N filter.

[ianqv]

Hi Marmalade,

On my engine, the engine intake size is approx 60mm (with a 65mm lip on the end).

The air filter had approx a 70mm INTERNAL dia hole to place the rubber pipe in to.

Have a measure of your intake pipe to see what it is.
Then have a look on Ebay at air filters.... they vary in sizes so you can choose what is best for you (and fits in the space that you have!!)

Once you know you intake diameter on your engine, and the diameter of the air cleaner you can then get your induction pipe.

More than likely your induction inlet on the engine will NOT be the same size as the filter.
This is not a problem - as step down / step up rings are available, or if your choose your air filter wisely it WILL come with these rings.

Example:

This is the link to the filter I purchased - and you can see it comes with step down rings (which luckily I didn't need!!).

www.ebay.co.uk/itm/3-INCH-New-UNIVERSAL-HIGH-POWER-CONE-AIR-FILTER-BLUE-/230657786295?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35b44681b7

Reducer rings:

If your filter does not come with these rings (if you need them) you can pick them up separately - you would slide the ring over the induction pipe, so it then fits nicely into your air filter.

www.ebay.co.uk/itm/Rubber-Induction-Air-Filter-Neck-Reducer-Ring-90-60mm-/160604846827?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2564cb7aeb

Induction pipe:

Just type "induction pipe" in to ebay, you will be spoilt for choice!!
So if your induction inlet on the engine is 60mm - type in 60mm induction pipe.

Its best to get the correct size pipe that fits on to your engine, and then use a step up / step down ring to get it to fit your filter.

The good thing about these filters is that they are washable / cleanable... prob a job for every other year depending on your enviroment.

Let me know how you get on or if you need any other help / pics.

Regards

Ian

P.S I have just ordered a roll of some acoustic pyramid sound deadening foam, this will be placed in the air tube that runs to the stern.
I'm hoping this will then eliminate ANY remaining noise - I will of course update this thread when I fitted the sound deadening.