Engine Pressure Waveform Analysis When Rockers Fall Off

In this video I go about showing what engine pressure waveforms look like when you have a unique situation in the valvetrain with only one intake valve opening and one exhaust valve opening.

[@mike-yp1uk]

The level of understanding is awesome because I can't seem to see it until it's explained but this guy is a natural. The explanation is awesome

[@reyrodpow]

Great load of info.

[@DTEAuto]

Glad to hear so, and thank you for watching

[@djosbun]

I'm astonished that the engine ran well enough under normal load that it was able to hide such a major valve train failure. I guess it shows how efficient the engine breathes with only one intake and one exhaust valve in operation on the bad cylinder. This was definitely a bizarre case study, Sadel. Thanks for taking the time to grab all of the Pico captures!

[@DTEAuto]

Dave, the customer had no idea, and unfortunately he had just purchased the vehicle when he brought it to me, the only thing he mentioned after I brought this issue up to him was that he thought it felt a little underpowered under heavy load. Pretty crazy situation for sure but glad to have experienced it. Thank you for watching

[@DJ-tn7vj]

Solid work

[@JoelAutomotiveInaction]

Thanks 😊 great diagnostic and explanation breaking down the waveform

[@mike-yp1uk]

This was an excellent case study and the explanation definitely makes it a watch more than once video. Deep dive.

[@DTEAuto]

Much appreciated!

[@clueless6559]

I have just found your channel and i am very impressed with your case studies , you should have more followers for sure, there are some presentation things but great content ,

[@DTEAuto]

I am glad to hear you coming across my channel, I hope to get it to grow but more importantly for me, is to get the good content out for people to learn from, I thank you for the support and for watching and you can always share with others to help it grow.👌

[@PaulysAuto]

Well done, looking forward to seeing more of your videos!

[@DTEAuto]

Thank you, there's plenty of good information on the other videos I have posted as well, and there's definitely more to come. Thank you for watching

[@PaulysAuto]

@@DTEAuto it's awesome to have someone who does an amazing job of teaching this stuff out there. Your style is very unique and I rather enjoy it. Keep it coming man!

[@chrisi1909]

Very good Video !! Big learning time !

[@gregjones8501]

Great video! I’m trying to get more into the European side of things and scopes as well! I appreciate your effort in creating this helpful content for us!

[@DTEAuto]

Thanks Greg, and I do get a lot of euro's in here, but I will work on pretty much any make and model. And a lot of the vehicles I post videos are sometimes unique scenarios, so feel free to check out the other videos I have posted in the past because have a lot of scope usage in regular ways and some unconventional methods for pin pointing diags. Glad you enjoyed and thank you for watching.

[@gregjones8501]

@@DTEAuto yes sir no problem! You have a new subscriber here and I’ll be on the lookout for more exciting diags from you!

[@arafo62]

Excelente video, recién lo conozco y voy a ver todos sus videos, se nota que van a ser muy interesantes, gracias

[@DTEAuto]

Gracias Marvin!

[@arafo62]

Algunos en español no quedarían mal jaja

[@DTEAuto]

@@arafo62 Talves un dia aqui en el futuro

[@northpostman]

Awesome case study Sadel, great analysis of the waveforms. I'm wondering if the higher peak for cylinder 3 was due to an increase in crankshaft speed because of the lower compression in cylinder 1. Very hard to see in the waveform for sure.

[@tombeam]

At idle, you wouldn't see a lot of need for a second valve, at higher rpm you would see it. 10:50

[@gavinfeng6568]

Hi, this is very great video, thanks for sharing. Do you think this car also exhaust side timing out? Because I saw the the exhaust valve close, pressure still going up. I think this is uncommon. Do you think so?

[@DTEAuto]

I don't believe that it was, from what I can remember, but I can't guarantee that since I never compared to a known good. But what I do know is that it is not uncommon to see that rise at that point in many euro's. I have seen it in other captures and when the cam gear is phased you can see that rise go away. Hope that helps , thank you for watching

[@glowvid]

You can hear clearly it while cranking its got uneven compression between cylinders

[@DTEAuto]

👍

[@mayowaodus6310]

Did you use a pressure pulse sensor here

[@DTEAuto]

Used a vacuum transducer on intake and inches of water on exhaust and regular absolute transducer in cylinder