Ducati Pistons - Detonation Failure Analysis

[@chorleycake7942]

Expect a shit sandwich e mail from the misses of Ducatis CEO 🤣

[@Addy29plus5]

Wee jock poo pong McPlop 😂😂👍

[@schnecks2180]

H- ntake and M-xhaust. Got It! :-)

[@Canuckcrisis]

Technology only found in Ducati.

[@ooohry]

think the h was installed sideways though

[@gutserker]

You had the right idea. EDM has such high pressure waves it can erode ears

[@bryankirk3567]

Detonation is where the fuel/air mixture turns from a low explosive (burning), into a high explosive, which detonates, mostly due to an overpressure situation. An easy way to do this is by installing a turbo without dropping the compression ratio.

[@robertsmall1715]

Blew a piston on an engine while giving it the beans, looked like someone took a gas axe to the side of the piston and melted a clean hole down and around the rings, ran it a bit lean, lol, lesson learnt.

[@croyce7699]

Great music selection. Had to comment before i even watched the video

[@WJRobbins125]

Excellent video! It's this kind of detailed information in a digestible format that shows your deep understanding.

[@TheHavoc09]

So, if both pistons look like the good one, would you re-use them if the engine was low compression and you fixed the knock?

[@clintwheeler1424]

Great video but I have a question. If you have sligth "eroding" above the first ring, all the rings move freely, and no roughness on the top of the piston could you reuse this piston? If you can reuse the piston would you take a peice of fine sand paper and clean the "eroding" up?

[@dirtygarageguy]

No. The piston itself is age hardened. Getting that hot removes this age hardening and the piston is prone to crack at the pin bosses

[@clintwheeler1424]

@@dirtygarageguy thanks for getting back to me and sharing your wealth of knowledge!

[@martins7194]

Great video. Very informative. :) I think this was a case of "whichever piston goes first". Do you know what other damaged this caused? Guessing the cylinder walls didn't like this very much. What is that weird pattern on the "leading edge" of the skirt on the worst piston?

[@dirtygarageguy]

The piston skirt we'll get to in the next video. As for other damage the cylinder head would take some of the damage - but I don't have pictures of that

[@jamesdougan8789]

great video i really like your failure analysis videos very well explained very interesting ...... you should teach mechanics at technical college/ university /tafe whatever you call it in your country you have a talent for it ....... any update on that R3 failure from the other mob yet other than the ferengi wife bitchin at ya...... lol priceless cheers james D

[@dirtygarageguy]

Not yet - but the next video is kind of linked

[@Humongous_Pig_Benis]

- Knock knock! - Who's there? - Detonation!

[@samehsouissi6986]

Hi, i want to take your opinion on somth. it's not related to this vid, but i am sure you can help. My bike sometimes acts funny. some days it will be running very well, n i can ride for 100s of KM with no issue, and sometimes i feel it loses power! I keep oil change on time, filters, spark plugs n maintain it very well. What do you think is the issue? is it weather? is it the wind slowing the bike? Fyi, my bike never died on me or left me in middle of the road. Any thoughts

[@beachboardfan9544]

Damn what kind of compression are those running and how heavy are they?

[@tonyhansom3160]

Have you had chance to inspect the barrels because this looks like the problem the old two strokes had when the compression was too high and the petrol - oil mixture was too weak. The initial problem was detonation and then the piston started to leave deposits of alloy on the barrel which started a partial seizure, not detonation traveling down to the top ring. Just a thought.

[@dirtygarageguy]

There is no build up just material removed - you can see where the already damaged piston has scuffed the cylinder. I've seen hundreds of pistons like this for both 2 and 4T. Like a said in the video you can see that the top surface of the ring groove is also eroded away.

[@jamescuartero]

Question for camshafts are concerned for high compression Motors what is the best camshaft for a high-compression motor to produce the most power out of it from the factory?

[@dirtygarageguy]

We'll get to that - one thing at a time.

[@jamescuartero]

Oh okay well if this is not too much to ask if you can incorporate this into your next video the specs of my engine is 231 intake 231 exhaust 354 exhaust and 334 intake is the cam specs with 11.5 to 1 compression ratio what will be the best for that particular compression ratio is the cam that's in there now good for all motor or is that more of a turbo cam?

[@allesklarklaus147]

This damaged piston along the side looks a little bit like the damaged piston I posted a few months ago with a hole burned into it at the side. Though that was from a diesel. And there the flame burned the piston's aluminium away around the rings but the rings themselves were just fine.

[@Matt-we7si]

Is that an E or an M matt please respond

[@kwahoo5746]

I'm curious if the pistons failed on the timing belts side or the other side?

[@dirtygarageguy]

I don't know

[@Motoinc]

It's a HEMI.... or is it?

[@seeul8rwaynekerr]

So here's a question for you Matt. With two sparkling plugs that the pistons are designed for, does this mean 2 flame fronts and no "burn to detonation" I.e with one surely there is the space and time for the flame to exceed the speed of sound? Or is this just compression too far anyway? Best regards Paul

[@dirtygarageguy]

This is a good question and we need to cover a lot more on detonation, combustion etc

[@ErrtuZarathos]

How come detonation pushes downwards against piston? Shouldn't detonation product pressure every direction? Or is it because piston is still comming up when detonation hapoends so two forces meet up?

[@dirtygarageguy]

Ignition has usually occured or is occuring. Below the piston is low pressure, rememebering that rings don't perfectly seal. So the combustion gases and hence pressure of that gases has 2 ways to go - towards the spark plug ignition event - which is does - and down against the rings. We can't see the gas interaction because it gone - what we're left with is the piston - in bits LOL

[@joonya4427]

Very interesting.

[@nobbytrussin]

Did you see any pictures of the bores?

[@dirtygarageguy]

No, unfortunately this happened a couple of years ago.

[@anthonyevans9718]

The world is fucking insane mate

[@funcounting]

Ducati's take on spark-assisted HCCI, lul.

[@spankeyfish]

Patent lawsuit from Mazda incoming, lol

[@spankeyfish]

16:36 In the microscope pic, the 'cliff' edge from the erosion looks a bit like basalt columns- is.geoview.info/great_basalt_structures_at_gerduberg_september_2008,14651264p

[@defaultdriftco00]

1:20 It’ll buff! 🤫

[@RAchvela94]

lugging engine in high gear at very low speed is it detonation ?

[@dirtygarageguy]

LOL no, and how?

[@funcounting]

What's that black stuff on the skirts?

[@rationalmartian]

I think it may be some kind of anti friction coating to help with piston slapping.

[@dirtygarageguy]

Teflon - that's in the next video

[@funcounting]

If teflon can take rubbing on the skirts why aren't they making rings out of it or at least coated with it?

[@dirtygarageguy]

The rings get hot, and wouldn't be able to hold on. As you can see the hot combustion gases bear down directly on the rings. The other problem is coverage. One thing with PTFE is it doesn't like to stick to much, and a thin cross-section ring doesn't have much meat to hold onto.

[@funcounting]

Bummer.

[@majormassenspektrometer]

Dugayti.

[@mcrande]

I guess we get your " guess what this is" answer from Facebook

[@pablorodriguez9281]

Do you think it is possible that a motor with permanent magnets of so-called free energy can work?

[@chrisdavidson911]

have you got a link to a picture or similar?

[@dirtygarageguy]

"Do you think it is possible that a motor with permanent magnets of so-called free energy can work?" - No. Its impossible. Energy has to come from somewhere. Magnets no not have an infinate source of energy, no matter how hard you rub them. LOL

[@pablorodriguez9281]

thank for the answer.

[@Gassit]

If Ducati engines are an L and not a V wouldn't one cylinder need to be a shorter stroke than the other ?

[@dirtygarageguy]

LOL no. why?

[@Surestick88]

I'm guessing the less damaged piston is from the front cylinder since it would get better cooling not having all the intake plumbing to block the flow of the cooling air?

[@dirtygarageguy]

I didn't find out which is which because the donator couldn't remember, how ever the rear cylinder is run rich because of this. More on this in the next video

[@craigmatthews5887]

Is this engine water cooled?

[@dirtygarageguy]

No, air cooled.

[@dirtygarageguy]

Its from a Ducati 1100 Monster Evo

[@chrisredfield3240]

The rear cylinder on a air cooled v- twin has a bad deal.

[@Motoinc]

Matt, do you ever sleep?

[@dirtygarageguy]

Sometimes

[@chrisredfield3240]

He sleeps with one eye open encase Delboy comes for him .

[@Motoinc]

@jesus jones you men like this vibrating kinda machine? Haha

[@Motoinc]

@@chrisredfield3240 Spot on!

[@fader1109]

them pistons are from a sv1000 the duke ones looks look flatter

[@dirtygarageguy]

"them pistons are from a sv1000" - LOL no there not....

[@jonnya6107]

First!

[@iFixThings]

Gee, Ducati don't leave much meat under those oil rings by the look of it.

[@Matt-we7si]

ive heard your boyfriend gets plenty of meat in his ring though

[@federruchi6147]

hier kommt die sonne! pr at least that's how i recall the lyrics lol

[@spankeyfish]

That's the chorus: 'Here comes the Sun'

[@carlosandleon]

hlo

[@Djokkinss]

"since its a forged piston you will have to drill a hole in the back for cooling and lubrication, which is not nessasary on a cast piston" kzbin.info/www/bejne/oZS3fo2GnbuhZs0m59s is that a thing?

[@dirtygarageguy]

More bullshit - Seems that Vertex themselves make cast pistons will ports in the piston skirt...... Fuck me, Vertex must be idiots! LMAO - www.ridersdiscount.com/vertex-cast-replica-piston-kit-6634mm-for-yamaha-yz250-1999-2016-22584a-1070159