Air intake silencer for 4108

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pcatterall

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Anyone had success with this yet? I purchased the 'recommended' ( ford ranger?)box but it is a bit like a dustbin in size and I am struggling to find a good place to fit it.
If reports are good I will struggle on but may need something smaller.
 
coopec said:
I've installed a 4.108 in an "engine-room" and I was hoping I would get away with some good insulation.

Is that not sufficient?

Did you see this thread?
http://www.sailnet.com/forums/diesel/101667-perkins-4-108-air-cleaner-silencer.html
Click to expand...


Noise Insulation is fine/essential but a surprising amount of noise is generated where the air is sucked in. Fellow forumites report big reductions in noise and I have personal experience of big noise reductions when using an air intake silencer on eberspacher heaters.
No, not seen that thread but have seen many similar.
 
Back in the 80s I installed a Sailor Silent Set generator in the engine room of the company ketch. It had very effective exhaust mufflers ( Vetus) and a longish black plastic intake muffler that reduced the intake noise. Engine was a BMW ( Hatz) single and in it's insulated box one could talk right by it without raising one's voice. Not sure who made the intake muffler, but it might have been Vetus.
 
Yes coopec, I guess that drawing the air in from elsewhere ( and where there is plenty of clean air and noise is not an issue) would reduce the noise.
the hose that DownWest mentions sounds like the ones for the eberspachers ( which are effective) these seem to be the ( standard) 25mm diam corrugated plastic hose enclosed in a larger ( 50mm?)diameter corrugated plastic hose. I may take one to bits but guess that the inner hose will have holes in it so that some air circulates/is drawn through the outer 'jacket'. With luck We may get an 'expert' to explain all this!!
Fitting a larger version of that type of inlet silencer would appeal to me more than the large plastic dust bin thing I am considering!!
 
pcatterall said:
Anyone had success with this yet? I purchased the 'recommended' ( ford ranger?)box but it is a bit like a dustbin in size and I am struggling to find a good place to fit it.
If reports are good I will struggle on but may need something smaller.
Click to expand...

I used a remote air filter from a diesel car in a scrap yard, worked well and cheap also you can mount it where suits best.
 
pcatterall said:
Yes coopec, I guess that drawing the air in from elsewhere ( and where there is plenty of clean air and noise is not an issue) would reduce the noise.
the hose that DownWest mentions sounds like the ones for the eberspachers ( which are effective) these seem to be the ( standard) 25mm diam corrugated plastic hose enclosed in a larger ( 50mm?)diameter corrugated plastic hose. I may take one to bits but guess that the inner hose will have holes in it so that some air circulates/is drawn through the outer 'jacket'. With luck We may get an 'expert' to explain all this!!
Fitting a larger version of that type of inlet silencer would appeal to me more than the large plastic dust bin thing I am considering!!
Click to expand...

That is exactly what is in the Eberspacher silencer... along with some foam in the outer pipe..... They work surprisingly well for what they are....... perhaps its vodo???
 
The bit I was talking about was not a hose, it was a moulded plastic job that looked a bit like some of the Vetus mufflers for the last bit of an exhaust run.
 
My old 108 had a flame gauze fitted directly to the manifold with an automotive cleaner on top. I think that if you have to use the "Thermostart" which involves flames ! A flame trap might be good idea, or some metal duct before adding any plastic.
 
Thanks Ian, you have convinced me to persevere with the ford Ranger box and filter as per your system. I just took the top of the unit out with me last time so will take the rest of it plus an adapter and some hose on my return. I will just connect it up any old how to see what improvement it makes, if as good as your report then I will find someway/somehow to mount it properly.
I looked again at the walker system but at $450 for what looks like a standard filter and a very small sound box it is too expensive and their noise reduction figures were not great.
Yes I have a lead sandwich blanket from my old transit which I can take out and try.
Thanks again
 
ianj99 said:
My thread with measurement:
http://www.ybw.com/forums/showthrea...ith-a-Marine-Power-Chinese-46bhp-diesel/page4
Click to expand...

Old thread.
I came into it while looking for the measurement (diameter) of the metal part where the mushroom-shaped dome is fitted (Perkins 4108 air inlet), the one around which goes the clamp.
For some reason when I try and access the above link the site tells me I have not enough privileges (?), anyway has anyone the above measurement?
Toying with the idea of fitting a filter/air box too, I d need to see what I can source locally before going to the boat.

Somewhere I saw 2-1/4", somewhere else 2-1/2", which make either 57mm or 63.5mm, unconveniently around 6cm

regards
r
 
The 4108 in my garage has the standard mushroom fitting. The OD of the air intake on the engine is 2.31" 58.7mm.
I was never able to reduce the noise from the engine in the boat despite trying different air intake filters, now I have my 'spare' engine in the garage working I may experiment again! When I get something that works I can take it out to the boat.
 
pcatterall said:
The 4108 in my garage has the standard mushroom fitting. The OD of the air intake on the engine is 2.31" 58.7mm.
I was never able to reduce the noise from the engine in the boat despite trying different air intake filters, now I have my 'spare' engine in the garage working I may experiment again! When I get something that works I can take it out to the boat.
Click to expand...

thank you very much Pcatteral :)
 
Roberto said:
thank you very much Pcatteral :)
Click to expand...

PS !!
I note that lead sandwich 'blankets' can be considered and I may still try one but others point out that unlike in a car our engines tend not to have good air circulation around them so the blanket may trap in heat and affect some of the bolt ons like the alternator. Worth considering this aspect.
 
pcatterall said:
PS !!
I note that lead sandwich 'blankets' can be considered and I may still try one but others point out that unlike in a car our engines tend not to have good air circulation around them so the blanket may trap in heat and affect some of the bolt ons like the alternator. Worth considering this aspect.
Click to expand...

thank you.
I always follow with interest all your threads about this engine; despite having had two totalling 15k-ish hours, always something to learn. :)

regards
r
 
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