Diesel heater silencers daisy chained and a genuine Webasto silencer // test

[@theonlywoody2shoes]

We asked, you delivered. Many thanks, most interesting result.

[@allenshepard7992]

Thank you for doing the test so we do not have to. This is good information not found elsewhere.

[@JG-kv4oi]

I manufacture fiber glass packed (sound absorbing) mufflers for cars from 12-40" long. I've found that silencing gains are minimal after 40" in length. There are 3 ways to silence an engine or in your case of a heater, sound absorption, sound reflection, or restriction. Or any combination of the three. Of course you don't want to restrict a heater. I've also machined 4140 dies to bend, reduce, and swedge tubing to make exhaust pipes out of quality material for these heaters so two pipes can be joined by slip fit and clamp. Thanks for the video. Jerry in Montana

[@DavidMcLuckie]

I like the sound of your silencer joiners. If you've got a link to share I'd be happy to share it on here.

[@footloose6382]

I made my own silencer with an old stainless vac flask. I drilled 12mm right through the bottom two layers and silver brazed a patch on the outside hole. I then drilled about a dozen 4mm holes at random in the outer skin and made a connector which I silver brazed in the top. It’s very quiet and the price was just right

[@harrickvharrick3957]

For a layman it is hard to understand what you are describing. Can you record what you did?

[@footloose6382]

@@harrickvharrick3957 The vac flask is essentially two chambers , one inside the other, sealed at the neck. The exhaust gases from the heater goes into the inner chamber. The 12mm hole through both chambers is to allow the gases to pass into the space between the chambers.the outermost hole was sealed by soldering a patch over it. To let the gases escape from the space between the chambers the dozen random 4mm holes were drilled into the outer chamber wall.

[@harrickvharrick3957]

@@footloose6382 I see. Sounds rather neat, actually!

[@rbrtcrowther]

That's the silencers covered. .....now on to the loudeners. ....

[@DavidMcLuckie]

Campsites of the world rejoice, we're going to make diesel heaters louder. :)

[@888johnmac]

yeah , with LED lights & some halfords ' titanium' heat protection round the exhaust outlet .. aah max power days

[@l0013]

Just find any motorcycle sport exhaust. You could get a droning "broap" all day from a generator!

[@Paxmax]

We need to crowd fund a tuned Akrapovic system

[@forevercomputing]

That's a trumpet then...

[@andersbergmanbontouch]

Thanks!

[@aronbraswell1589]

cheap silencer: take a metal paint can drill hole in lid for exhaust in. Take can drill small holes in bottom so area of small holes equal exhaust size. Fill can with corse stainless pot scrubbers. Install lid and install on exhaust. Added benifit, you can easily replace or clean silencer medium

[@21millionreasons]

I come for the "hellooooo" and stay for the interesting content. Thank you sir 👍

[@ChrisLesmerises]

Sounds like the small resonators let the low fq pass, the giant unit lets the high fq pass. Put them in series?

[@DavidMcLuckie]

As requested in the new video.

[@ChrisLesmerises]

@@DavidMcLuckie And I totally won the observation game... lol! Thanks David, keep experimenting!

[@Fekillix]

You can tell someone was given an original Webasto exhaust in China and were told to "make this, but cheap"

[@GrumpSkull]

You can tell the Webasto was also made in China because the brand name is stamped upside down.

[@RCModelling4U]

My way of thinking is that a silencer needs two things. Gas expansion and slower airflow. I reckon a steel box lined with wadding and an internal baffle plate would deaden the sound and reduce the venturi effect at the outlet. The gas is creating the noise at the outlet on all of them as airflow in = airflow out. A box that allowed gas expansion and therefore a slower exit speed (bigger hole out than in) would do the trick. A car exhaust needs back pressure so a straight through exhaust can reduce performance without fuelling mods, whereas the heater just needs somewhere for unrestricted burnt gas to go.

[@crazy-diamond7683]

I bought a cheapo ebay pit bike exhaust 12/13 quid. Has done an amazing job, surprised me just how good it was.

[@simonparkinson1053]

What about restriction introduced by each? Maybe tee in a manometer and see the pressure difference where the exhaust exits the shed? Then it can be determined if you may need to tweak fuelling

[@DavidMcLuckie]

I'd always tune the fuel after making a change like this. Even changing between clone silencers the restriction may be different.

[@cwf8d270]

my silncer is 2 6x12 aluminum boxes welded together with heat syncs and a fan with then a 7/8 tube running out the wall. really quite and gets extra heat off the exhaust to use as extra heating for the garage. now ideally i would have some copper tube and water to get more heat out of it.( to maximize the heat you can use the exhaust temp going outside should be room temp but good luck with that)

[@MACK13]

Excellent video. Thanks for taking the time to film and share. Here's an idea for you to try? Big issue with CamperVan wive's. 💡idea alert... for people with hair: Scenario: Not enough battery power in the camper for wife's hair dryer - How do YOU cope? We have a CDH which blows warm air out of a 100mm vent. If I got a vacuum hose with a crevice attachment at one end, and a 100mm funnel reduced to fit the other end of the hose - then temporarily secure it over the heater vent - in theory, this should blow concentrated warm air out of my crevice enough to blow dry my wife's hair? MACK and Maggie, Huddersfield

[@maximilianjankowski]

i think this was the nices hello an the best greeting ive ever heard , i sub for this

[@maxrockatansky1271]

healoouuu

[@Max-dr6yr]

Adding an additional silencer on the burner INTAKE air connection will make the BIGGEST improvement on a campervan installation. Sound waves from the combustion noise travel upstream too!

[@raczyk]

What silencer can you use on the air intake?

[@shakesit]

Webasto make a marine silencer and we HAVE TO use them in narrowboats. They are NOT like the one you have that has a drip hole on the bottom for water to drip out. This also lets out exhaust gases so could kill you if you were on a boat. You can crimp and weld the hole shut but a boat safety inspection may pick this up and fail you. Back pressure can be a problem with lots of boxes fitted I have found. it also depends how close or far you fit the box on the pipe work. Love the video clips would be good to see more trouble shooting on Webasto heaters....

[@mondavou9408]

Loved the video thank you. As of January 2022 in USA, Ebay Webasto muffler $50 usd = gbp $38

[@jstep4146]

Generally speaking, they are barely going to help chaining the same style. Your best bet it to chain 3 DIFFERENT silencers, as they work on different frequencies of noise, depending on the internal configuration.

[@JonnyMudMower]

I run my 5000watt Colman power mate through a muffler of an old dodge Dakota 👍🏻🇨🇦

[@velianlodestone1249]

It would be interesting if you could figure out how much back pressure each of these silencers create, the Webasto one probably creates quite a bit of it due to the zigzag in the tube. The scooter one may therefore be superior (if you have the space) as it looks like it is a straight tube.

[@stijnvandamme76]

why would they create back pressure?? 1 the heater has a blower, so its pressured exhaust.. it blows out.(hence the noise) 2 they are not restrictive in design, if you put 10 on a connection one after the other, you can still shoot a bullet through the hole and not hit anything on the way out.. 3 the hot air if anything will cool and becomes less dense the further down the line... (the exhaust isn't even all that hot relatively speaking)

[@blk77sunshn]

@@stijnvandamme76 When air cools down it becomes MORE DENSE .......

[@whisthpo]

Great, 'Real World' demonstration! Subbed !

[@JimLahey21]

You should do a review on 12v ovens?

[@bobjohnson2570]

three silencers....I love this guy. There are some garden tools that could do with a proper silencing :-)

[@simonmarshall3869]

Ohh my god I bought a second to do this and never got round to it!. Thanks for the vid!

[@harrickvharrick3957]

Good fun to watch you, much appreciated!

[@robwallace3670]

Great comparison. Thanks from New Zealand

[@krimke881]

I run with two original webasto silencers. it excellent.

[@DavidMcLuckie]

Two Webastos, that costs almost as much as my heater! :)

[@chriskautz3245]

Just came across your vid . have to say the Vehicle muffler is the quietest . What would a larger bore exaust pipe do ? ( short 25mm from the heater to a 2-3 inch diameter pipe then fitted with a muffler .

[@danielauen7790]

I have no idea how I ended up here, but I'm gonna go have a poke around, sounds like I might fine something interesting on this channel.

[@Ralph2]

I'd guess the big silencer would be even more effective when heard from a distance, it better attenuates the low frequencies. Interesting.

[@verbantermainia1937]

Is it possible to make the silencer into a heat exchange for hot water? Would be great to use all that wasted heat.

[@Dave5843-d9m]

Feed the exhaust through a steel radiator. Make sure outlet slopes down so that condensed moisture can drain out. HOWEVER there will be flow restrictions so you'll need to test the exhaust for unburnt fuel.

[@ireland_love_life]

Good video😂 personally on camera it sounded like the 3 multi was more quiet?

[@UKrissy]

Cheers mate. Can't wait to unbox my chinese heater to see how loud it is... no muffler was provided...

[@BeyondWrittenWords]

The silencer is reducing the noice but it's getting rid of the condenced water vapor too? The silencer produces some drops of water from the bottom?

[@korsu1234]

Inrested of opening those silencers and look what inside?

[@tinnedanger]

Obviously the black muffler is the best ... What is it and where do I get one ?

[@assassinlexx1993]

If you a product called safe and sound insulation Batts. Made you own baffled box. With multiple exhaust holes the sound will be incredibly low. This insulation is fire proof and water proof to a point.

[@Woodlandbill]

I've found the most noise comes from the air intake, I've adapted mine and it certainly quiter now

[@davidcramphorn543]

how did you adapt it Bill? Currently looking into this and wondering if an airbox would make it quieter......

[@chrisharrell2449]

I read using spiral pipe rather than the ribed pipe provided is quieter without a silencer, than a ribed with a silencer

[@stephenmason5682]

Did you consider the back pressure the muffler causes the pump?

[@kan815k]

Is it better to have muffler at the end OR middle of the exhaust pipe?

[@jamesmason7124]

Hellooooo from America , thank you for doing this test anyway you can test the marine mufflers

[@forevercomputing]

SILENCERRR here ...... ;)

[@dougferguson5581]

I noticed air bubbles pumping into the heater. It burps and farts some days from the muffler . Any way to fix that? It's a Russian Planar 8DM mode. Thanks

[@richrickyc107]

can you try silencing the hot air out as i find the fan noise the loudest

[@lin018]

Always have fun watching creativity.

[@melbournesubtropicfruits9474]

Theres literally no restriction in the clones - is the Webasto similar? I would pack some stainless pot scrubber inside but not too tightly but more in centre so exhaust gets pushed around then out other side? Give that a test?

[@jeoffer]

How did I get here watching videos about diesel silencers? Thumbs up though.

[@johnnydrac]

you do know you can install a DB Meter on your smartphone right .. :) Love your videos.. you are the best

[@DavidMcLuckie]

I thought about the dB meters. But here is the data I pulled from Audition while editing - Big silencer = -43.63LUFS / No silencer = -27.83 LUFS / Scooter = 32.77LUFS / Webasto = -33.91LUFS / Clone = -32.99LUFS / 2xClone = -34.50LUFS / 3xClone = -35.68LUFS

[@scottl7644]

Thanks once again for your time and effort David. 💪💪💪 Keep at it mate. ✌️🙏✌️

[@UQRXD]

You do not want to inhibit the exhaust gases beyond the original design. If any thing get an old car muffler a small one or cycle muffler go larger don't restrict the exhaust. I think a heat exchanger would be a nice addition and capture the waste heat of around 3 to 4 hundred degrees F.

[@aFREELONEWOLF]

QUESTION ? Can i tap into my main vech. exhaust ( before the muffler ) and run it that way ??? I would drill the hole on a angle so it shoots the exhaust into the direction of the muffler :) Peace and thanks for any advice on this idea :)

[@juanitafinn-1460]

Well done mate ! 🙂👍🦘

[@Lunas2525]

What about the wabasto and the the 3 clones then the scooter one

[@dughuff8825]

Loving the experiments! I might have missed it in the earlier videos, but did you mention where you got the generator silencer from? Thanks.

[@DavidMcLuckie]

It's just one I picked off eBay, literally the cheapest one I could find. :)

[@simonsimpson4695]

@@DavidMcLuckie Me too actually. Would you say that putting the Webasto and the big silencer together will cause any problems for the heater re soot etc. looking on ebay I didn’t find the big silencer so having a link or something might be useful if possible. Thanks David, if you see this comment. New to your channel. Very interesting stuff.

[@darkstar200011]

Hello Mr McLuckie do you know roughly how long the exhaust pipe from a diesel heater can be before it starts causing problems with combustion, as the exhausts that come with the heaters seem a bit short, i see ones for sale at 1.2 meters even 2 meters long but am unsure if these would be suitable or to long. Also really enjoy your videos they are Awesome 😁😎

[@DavidMcLuckie]

Perhaps I can add that to this years test list.

[@kan815k]

I have seen on Weaste and Eberspacher user manual that exhaust pipe can be max 2 meters.

[@sprinterdiscovery]

Interesting video! Is the Espar (Eberspaecher) exhaust similar in quality to the Webasto exhaust?

[@DavidMcLuckie]

I'd expect the Eberspacher to be the same level of quality as a Webasto.

[@lilseezy8123]

Is that exhaust pipe ran on a 25mm copper pipe?

[@DavidMcLuckie]

It's some size of copper pipe.

[@CitizenJane-]

Does lagging the exhaust pipe make any difference to the noise level (or perceived level) ?

[@Luckyfeller]

@2:30 did anyone else point at the screen saying "there it is" when he said that he couldn't find the copper bit? Or was it just me?

[@DavidMcLuckie]

I did it while I was editing as well. I almost put an arrow in. :)

[@davidellis1355]

I use two of the "clones" cheap and cheerful and makes enough of a difference.... Does anyone know if there is some kind of lagging that would effect the volume ?

[@Lauriemine]

What about exhaust tape/ heat wrap? Might be what youre after, or something like rockwool can handle very high temps.

[@davidellis1355]

I have got the heater in a rockwool lined box, reduces the roar, I've been thinking about directing the exhaust into some kind of chimney / flue to vent exhaust up and away from other campers

[@ianharvey868]

I hear the small scooter changes the pitch to a lower octave but the generator can either don't cut the high octave sound or its resonating inside, can you use try the scooter exhaust and then the generator can? Just wondering if its the can that's resonating.. If its not then you have a high cut silencer and then a low cut sound silencer :)

[@danh8302]

I changed the exhaust on one of my trucks and just used the muffler and pipe section of one side. It’s a 2.25” diameter pipe, about 5’ of length plus a generic muffler, the exhaust is much quieter than the fan and see no reason to change it.

[@4thelolz1]

Can you do 2 tests for me please ? 1. Can you run two controllers connected at the same time ? 2. Can you extend the exhaust and see if anything happens as I’ve heard you must not extend it due to back pressure

[@DavidMcLuckie]

Number 2 I am doing right now. My exhaust is an easy 2m long. I just tuned the fueling accordingly.

[@4thelolz1]

@@DavidMcLuckie good stuff, I await your video sir! 👍🏻

[@oBseSsIoNPC]

Hmm, I would suspect that adding silencers will start to really restrict the exhaust flow. Interesting experiment :)

[@evognayr]

Glasspacks

[@oBseSsIoNPC]

@@evognayr strawberries

[@DavidMcLuckie]

Restrict yes, but not by much with the cheap silencers. There's not a lot in them to restrict. :)

[@velianlodestone1249]

@@DavidMcLuckie I've seen a surprising test on the cheap silencers that the straight-through cheapo silencer exceeded the performance of the cheapo curved silencers. Anyway these tests _NEED_ a DB meter or even a audio analyser with spectogram.

[@stevenlewis260]

Hi David great videos. I’ve heard that you shouldn’t exceed a 270 degree angle on the exhaust outlet and doing research those cheep muffler have a v in side with two of them plus the 90 degree coming out of the bottom of the unit you might mess the performance of the diesel heater up there are two sorts of cheaper muffler one like yours and one that is a straight through one also the straight through one is a lot quieter then the v shape hope this helps

[@DavidMcLuckie]

You just need to tune the CO output for the configuration you make. I noticed that if I add a slight restriction I can reduce the fueling slightly as the hot gas stays longer in the burn chamber.

[@Mistabushi]

I mean it's not really a muffler, two slices of steel with spring inside. I run heat exchanger instead and that not only eliminates noise but actually helps recover ar least 50% of exhaust heat.

[@jesshowe4591]

fantastic demonstration thank you.

[@Lordlindef]

Clogger faster whit more dempers ???

[@RedRupert64]

Thanks. Is it recommend or allowed to use copper pipe for exhausts?

[@DavidMcLuckie]

Well. Yes and no. Technically you shouldn't as there can be a reaction and gas given off. But we're already venting a toxic gas to somewhere else, so as long as you know what you're doing. I'm also only using it for the end of the exhaust which is a lot cooler than the heater end.

[@KrishnaKrishna-bj7nf]

excellent demonstration Thanks Ya

[@888johnmac]

don't know why but the 3 clone silencers daisy chained looked so funny .. i wonder about 1 clone at the heater & a 2nd one at the end of the exhaust pipe ( i'm thinking of the 2 stroke bike resonator chamber then silencer set-up )

[@davidellis1355]

That's similar to how I have mine set up (mainly due to laziness) I have the exhaust that came with the heater, then a second exhaust kit after that, made a big difference

[@888johnmac]

@@davidellis1355 .. good to know , thanks

[@scottl7644]

Meant to ask David. Is these connections 25mm copper pipe??? ✌️🙏✌️

[@bondubasher]

Yeah I played it back a couple of times and have to agree with your conclusion, as far as I can tell via mic your end and speakers my end 😉

[@whitefreeman5798]

from what i could hear of it i could say the biggest difference was having a muffler on it or not having a muffler on it.. but the generator muffler did seem it may have made a bit off difference over the others

[@DavidMcLuckie]

I agree, any muffler is a big improvement over no muffler.

[@arkangelgiardiniere]

*hooah* Grazie ! Sei un *Genio!* hooah

[@pjetenere1]

I've just bought one of these. I have used it for 6 consecutive nights. Do I have to tune or set these up to optimize running?

[@DavidMcLuckie]

Ideally yes. A cheap CO gauge and adjust the fueling for low CO. The lower the CO reading the less unburnt and wasted fuel your heater will be using.

[@jaysonlima9271]

@@DavidMcLuckie I've been running one of those cheap Chinesium diesel heaters aboard for the past few years and have never done an exhaust CO2 test on it, I installed it, it made the cabin nice and warm and I "tuned" it to keep the smoke down, it literally never occurred to me to test co2

[@kleetus92]

I'm confused on what the source is? 5000watt generator? Like reciprocating engine generator or a kerosene burning heater of some kind?

[@DavidMcLuckie]

Diesel burning heater.

[@kleetus92]

@@DavidMcLuckie Ah, that explains it... Thanks!

[@davidmilledge221]

Cooper fittings make sound louder back in the hay days we fitted copper sleeve pieces into our exhaust pipes on our car exhaust it when got hot the heat made the copper crackle and the tune out off exuast pipe was louder

[@casemodder89]

You could shove everything up there and she was getting louder. 😄 You're just blocking the fiberglass or steelwool.

[@patrickbodine1300]

*My* cheap Chinese heater is run without any muffler and I can honestly say that it is quiet. So, why even have more than one when none works quite well?

[@Deltro61]

Do you actually hear anything from inside the van?

[@DavidMcLuckie]

That depends how you build the van and where you put the heater. On mine the heater was the opposite end of the van from the bed, so you didn't hear anything.

[@Deltro61]

Yeah, I just finished my installed today, and I'm not hearing anything inside the van. Take a walk outside and sure you can hear it, but when it's cooler outside I'm not going to be outside anyway. I just put mine in without any muffler at all. Works for me. What is far more annoying is the, tick tick tick of the fuel pump. I have a rubber mount that everybody recommended, but really surprised how loud that thing is.

[@DavidMcLuckie]

@@Deltro61 Did you mount the pump inside or outside? I put it outside as well and don't hear it inside.

[@Deltro61]

Yes, mine is outside, but zero insulation in the van right now. Just getting started on conversion. It should quiet down in time (I hope!)

[@girafmad]

I got no idea what that exhaust? He silenced was from or to what purpose it serves, but more so I'm baffled why this is in my recommendations...

[@jamesbaker2006]

I like your vids, god you make me laugh

[@andreas3507]

Could you please test a chinese WATER-heater similar to those from webasto/eberspaecher🙏

[@DavidMcLuckie]

I've done a 16KW version. I've got one to test soon, just need time and space to set it up. :)

[@solstar4778]

Are these for a lawnmower?

[@bakedveal2624]

You're lost huh

[@norm5785]

Thank you for sharing

[@egn83b]

good to know when winter comes

[@TheFlybyman]

Thankge great info

[@ЯрославШевченко-х7й]

I'm always sleep with ears plugs and don't hear any noise 😊

[@nickking1510]

I would get a new universal car muffler / tractor /car/truck 2inch diameter much larger than tiny ones in video and use it for heat recovery inside . Also would paint all mufflers and pipe hi heat black . Lot of wasted heat going out side .Just like building hi performance car exhaust . If you look lots of discontinued mufflers around cheap

[@urmintrude1969]

If you want quiet fit the sealed eberspacher marine system

[@artursmihelsons415]

Thanks, this is what I want to hear.. 👍

[@Namdor2012]

What you do is run a long pipe over the fence to the neighbour's house...

[@slicktmi]

Does anyone know what the Chinese ones are packed with?

[@DavidMcLuckie]

I don't want to say asbestos, but it's probably asbestos. :)

[@slicktmi]

@@DavidMcLuckie that's what i heard no idea what asbestos looks like but on mine it looks like fiber glass hairs

[@danielson101]

is it restricting?

[@DavidMcLuckie]

Any exhaust like these will add some restriction. Hence the need for retuning if you make changes.

[@4xprops457]

Won’t this cause restriction? And burn a valve?????

[@casemodder89]

Thats a diesel burner. Not a combustion engine. It is for heat - not for the mechanical work.

[@chrisdekock8864]

I don't have any valves on my chamber

[@tailsupcharlie4273]

Thank you

[@nagyandras8857]

Daisy chaining the same kinda silencers is not the best idea. Can you make a test with your original silencer chained to the small regular silencer chained to the Chinese drum silencer?

[@adrianarmer2585]

Can you try websdo with one of the cheap ones daisy chained