Much of this material came from a file Ditex (makers of the Viso scope) sent me with a request to render it in better English, since Bulgarian is their native language. I should have given them credit in the video (and I'm giving them credit right now), but I built the Power Point only using that document as a framework. I created some of the graphics from scratch. I might also add that Ditex gave me permission to use their material in my class, but I can't publish the document - you might be able to get a copy from them - they're publishing it somewhere.
Hi McCuistian, nice job on the presentation. Just a quick point. At 8:32, Yes Point 1 is the time when you have maximum pressure in the cylinder but not always the point where the piston is closest to the cylinder head. Think about what would happen if there is large compression leak. It is possible to still have the piston climbing, and be close to the cylinder head, and have pressure dropping. The majority of the time highest pressure = TDC but cannot be taken for granted as being true all the time.
thanks very informing video.how can i use pressure transducer if there is no access to spark plug without removing the intake manifold.(dodge caravan bank2).
Wow this video is awesome. I think there is a guy bernie thompson who wrote a book on the subject and made software for this type of stuff. I really like your video because i can watch it for quick refreshing. If you dont use it you lose it.
6.7.2018 Long Beach, CA. www.automotivetestsolutions.com "Big Dogs Neighborhood" Even the Laptop Scanner software can Test you CATS by driving around the block.
Hi.., the grafic Same with my grafic on my computer in Real time accuisition data on Internal Combustion Engine 4 stroke in 1993 or abaout 30 years a go.
Great overview! Do you have copies of the material out there anywhere? One correction though. Nissan advanced electrical training includes scope use. The measuring interface garbage that works with the factory scan tool and now picos. I keep my scope out all the time and i know a few other deal techs who use them. I think it just comes down to the person and if they are really into accurate diag.
Much of this material came from a file Ditex (makers of the Viso scope) sent me with a request to render it in better English, since Bulgarian is their native language. I should have given them credit in the video (and I'm giving them credit right now), but I built the Power Point only using that document as a framework. I created some of the graphics from scratch. I might also add that Ditex gave me permission to use their material in my class. Here's the link to the material I "Americanized" online: autoditex.com/page/cylinder-pressure-sensor-64-1.html
juan rodriguez , I do not agree with you , I have a home made in cylinder pressure sensor , and the waveforms are exactly like the pico transducer sensor, may be somthing is not good with yours.
I don't understand how your statement regarding section 5 could be correct, that if the exhaust valve opens between 170* - 195* after TDC then exhaust timing can be assumed to be correct. I've read in Tim Gilles: Automotive Service that the exhaust valve must open before BDC, which I've heard in other places as well. Also, if a CAM sprocket has 36 teeth, then each took represents 10* of CAM rotation, meaning you could be off one or two teeth and still be within the range you specified. I have a similar question regarding the intake valve opening, which I thought was supposed to open before TDC, but 390* would put it after TDC.
Bob, the numbers you mention are not the valve opening events.These are the degree numbers for the midpoint of the exhaust and intake ramps, different things.
hi sir, my question is that how on the waveform on the power stroke if both valves are closed how would that line not be lower than the intake stroke because if you are going down on the power stroke it seems if cylinder is closed up you would pull a vacuum and that line would be lower than the intake stroke could you explain that so it makes sense
Joe Clark The power stroke is traveling downwards, after the compression stroke! The spike in pressure is what you see as the pressures in the cylinder rises! After the intake stroke, air is trapped in the cylinder to be compressed! At the end of the compression stroke, is the power stroke, and is the pressure of compression returning to (reducing, or going back down) normal as the piston travels down after the compression stroke! It seems as tho it should be a vacuum, but air is drawn in under the intake stroke, and then is compressed during the compression stroke, at which point on the pattern, the decompression of the power stroke, not power as if the cylinder is producing power, just decompression!
Is this is video form school ? If yes i quite suprised how modern it is.When i was student we learn mainly mechanical part of engines form 90's. Im from Poland
