How hot do end cans (Silencers) get?

[JonW]

Ive been considering powdercoating a set of silencers I have, but I worry that as the powder im thinking of using sets at 200 DegC that it would 'gel' at considerably lower temps and stuff flying off the rear wheel might stick to them, ruiing the finish.

I know that exhausts tend to be very hot at the cylinder end, cool a bit in the belly of the pipe then heat up as the gasses fight to leave rthough the stinger, but how does that translate in Deg C to the silencer... hmm...

So, has anyone ever tested the temp at the end can? during and after a run?

[Norbo]

They do not get very hot compaired to the pipes or down pipes .

[JonW]

Cool.... but I wonder what temp it is.. I know you cant touch them... The industry standard for pipes in buildings etc, says this:

"The industry standard is 60 °C or 140 °C, which will not generally cause damage if held in contact for 5 seconds. This is therefore the maximum temperature of any pipe or other surface which might be accidentally touched. Above this, insulation must be applied."

So its above 60... are we saying 100 do you think? or more.... once we hit about 120 I think its too hot for normal powder :/

[veg]

Go into your kitchen into the utensils draw and take out the meat probe ride the bike put the probe onto the silencers and waalaha temperatures.
Disclaimer ‘ this only works if you have a meat probe, any damage done to the meat probe is purely down to user error, no responsibility is given by the poster if damage is caused to the meat probe , no responsibility is held by the poster if your Sunday roast ends up tasting of two stroke oil, if however it causes a certain smokiness that adds to the taste and consequently the idea is then sold into Heston Von blumenthall as a smoked chicken ala zee zwei stroken profits will be shared

[Tobyjugs]

Hi Jonw don't forget to take into account the ambient temperature of your sunny weather compared to the British weather.

[steve h]

Apr 6, 2018 10:49:04 GMT 1 Tobyjugs said:

Hi Jonw don't forget to take into account the ambient temperature of your sunny weather compared to the British weather.

If in your in Aus, surely you can fry an egg on them if the bikes been standing in the sun? Or warm a pie up if you are an expat.....

[steve h]

Apr 6, 2018 10:42:17 GMT 1 veg said:

Go into your kitchen into the utensils draw and take out the meat probe ride the bike put the probe onto the silencers and waalaha temperatures.
Disclaimer ‘ this only works if you have a meat probe, any damage done to the meat probe is purely down to user error, no responsibility is given by the poster if damage is caused to the meat probe , no responsibility is held by the poster if your Sunday roast ends up tasting of two stroke oil, if however it causes a certain smokiness that adds to the taste and consequently the idea is then sold into Heston Von blumenthall as a smoked chicken ala zee zwei stroken profits will be shared

Add a twist to the flavour by using the strawberry smelling 2T oil.

[paulincayman]

Cheap laser gun.... under $15.00 . very useful elsewhere too

[JonW]

All useful (maybe) responses... and yes I have a probe and a laser heat gun... but the reason I asked is that I dont have a bike I can ride...

I figured someone would have tested this already, but seems not...

[veg]

Sorry Jon can't help at the moment my bike is still with NK racing.

[JonW]

No worries Veg, I really thought someone (maybe who was having their bike Dyno'd) would have tested the temps of various parts with a laser gun... I know when I got mine I tested anything I could find, nailed down or not lol

One thought I did have. I quite happily powder my engine covers, they get hot, but perhaps not as hot as a silencer... and are not in the firing line of the rear wheel... tho the front does kick up dust of course.

Im sure half the people reading this think 'why not just do it and see?', but the issue is that I was going to chrome powder these, that would be a bunch of work as thats a two stage process with different powders brands in my mates setup that I borrow, and not simple to do and therefore easy to screw up. I really dont want to waste hours and hours doing it if simple satin black paint is the better choice...

[arrow]

Hi John, have you thought about using a ceramic coating? That would stand a much hotter temperature than powder coating.

[shaunthe2nd]

I've had a few sets of standard 4L0 pipes powder coated with no problems. The downpipes are treated with a VHT paint though, and not powder.

[steve h]

www.interpon.co.uk/expertise_topics/innovations/interpon-ht/

[JonW]

Thanks for the other ideas but the powder I wanted to use is the one I already have, ie not high temp. And I cant use ceramic for various reasons, not least as im doing it myself.

So, I guess no one has ever run a laser heat gun over their cans. I didnt expect that. Aldi has been selling these units for a few years and I assumed I wasnt the only one to buy one and then not quite know what to do with my new toy lol.

[Deleted]

Apr 6, 2018 22:44:23 GMT 1 JonW said:

Thanks for the other ideas but the powder I wanted to use is the one I already have, ie not high temp. And I cant use ceramic for various reasons, not least as im doing it myself.

So, I guess no one has ever run a laser heat gun over their cans. I didnt expect that. Aldi has been selling these units for a few years and I assumed I wasnt the only one to buy one and then not quite know what to do with my new toy lol.

If you have a laser heat gun, and 'a bunch' of bikes, why not start one up and check the temperature! I assume your bikes start.

[JonW]

Why do people assume Im just lazy? Is that what my previous posts to this site make me look like? If so that worries me...

Yes... I already said I own a laser heat gun. So... I obviously have nothing I can run right now to test this or I'd have done this myself.

Ok, I can now see no one has ever pondered this so no one has tested it. I thought that perhaps they had, my mistake.

I'll find a local lad and agree a time/date to get round to testing his bike. it will take longer than locating someone who has already done it and that puts back my plans with these pipes. I dont feel that asking the question was out of place when plenty of people ask questions on the forums to save themselves time, We've all seen that some cant even be bothered to go into their own garage to check something so ask and lo-n-behold 9 times out of 10 they get an answer, and quick;y too. I have no problem with that really, and I even muck in and answer them.

Ahh well... Its back to me having to do the work, thats fine. I guess that's what happens when you ask questions no one else asks I guess.

[veg]

Jon don’t think anyone else thought that and you did clarify in earlier posts sometimes people wade in with a response without having read all the previous posts I know I have. Just a thought I assume the are single skin silencers? Also I know that I have used heat cured vht pj1 paint previously on both pipes and cases. I don’t know what the heat range was for this vht paint but it could be interesting to see how it relates to what you are looking at and if there is much difference between the 2. If not then that may answer your question, unless I have missed it in the above 👍

[Tobyjugs]

I will be out later today on a bike and i will give it a good ragging and try to burn my hand for you. It's also sunny so it's the same conditions as Ozz.

[muttsnuts]

I will check the temp for you when I run the next bike up on the dyno, what material ae they, steel or aluminium as that makes a big difference

[earthman]

I bought one of those laser guns from Lidl recently funny enough, will report back here with my results, I dunno how accurate they will be though.

[bazzer5115]

I think carbon cans run even cooler.
i.e. not very hot at all

[Tobyjugs]

After giving the bike a good thrashing plus plenty start stops it was just a little too hot to keep your hands on it. I would say around the 70 deg celcius

[iwantalc]

ask the powder coaters you are considering using they should be able to clarify what temperatures their work is resistant to..just read the top thread you are doing yourself but I would still ask the question to a reputable company..

[JonW]

Thanks for all your help guys, I do appreciate it.

Dave, Ahh, yes you're totally right of course, I should have said what theyre made of. The silencers are the ones from the RZ250R model. Ie they look like the later YPVS OEM pipes, but these are bolt ons. They are heavy units and seem to be quite thick steel and use a baffle much like the other YPVS models which looks like it would trap and hold gasses in there for quite some time. They are single skin Veg, pretty thick steel too.

Earthman, I also have the same (or close, it was form Aldi) laser heat gun, I reckon its not to far off being correct from the tests Ive done, and even if it was say 10DegC out it would be close enough for this test.

Ian, thats a fair point, I can call and ask the company I bought the powder from.

Toby, Thanks for sacrificing your hand mate. Its appreciated. Back in the day my sister got a nasty burn when she went for a ride with one of my mates (it was a date i think, looking back!) on his Suzi ZR50. She burnt her ankle on the exhaust enough to blister and leave a scar thats still there today. She put her ankle in the nearest canal to cool it down (not advisable!) as we lived in Amsterdam at the time.

[steve h]

My aldi infra red temp gun is only about 3 to 4 deg C out at boiling point of water They aint much use at temp reading on shiney surfaces like chrome. I had to spray a bit of paint on oem chrome pipes to get a reading.

[JonW]

Thats interesting, the shine must do things to the laser I guess.

3-4 Deg is about where Im comfortable with mine too. My aldi kettle tells me my water is at about 85 Deg when its got a rolling boil on... so thats way worse lol

[Tobyjugs]

Apr 8, 2018 2:04:07 GMT 1 JonW said:

Thats interesting, the shine must do things to the laser I guess.

3-4 Deg is about where Im comfortable with mine too. My aldi kettle tells me my water is at about 85 Deg when its got a rolling boil on... so thats way worse lol

Normally if it is a good make you can alter the settings for the surface your measuring, But i've never seen anyone do it.

[paulincayman]

Are you going to factor in some occasional over heats which put the temps outside the normal range? My 4lo came with f2 silencers. One can had a nice big blue spot on it ( and hole in that the piston to match ) an extreme example I know but it illustrates the point.

[steve h]

Apr 8, 2018 2:04:07 GMT 1 JonW said:

Thats interesting, the shine must do things to the laser I guess.

3-4 Deg is about where Im comfortable with mine too. My aldi kettle tells me my water is at about 85 Deg when its got a rolling boil on... so thats way worse lol

I reckon that's the steam affecting the readings.