Thanks, Sean. You've raised the bar for teaching this topic! Interesting.

Very well done comparison of pressure sensors and explanation of absolute versus gauge pressure. Excellent information on calibration for the PicoScope! I've subscribed!

Thank you sir.. keep them coming we are learning ✍️...

Excellent comparison test. Thanks!

Thanks for the review will pick up that ssi sensor.

This is an excellent video. Thank you very much.

Great video Sean! BELOW ARE PRICES IN CANADIAN ROUBLES AS OF MAR/2022 Fluke PV350 (old design) - $800-$1300 Ebay/Amazon sensor - $28 Honeywell 300psi (px2an1xx300paaax) - $188 Honeywell 500psi (px2af1xx500paaax) - $160 SSI Technologies (p52-500-a-b-i36-4.50vp) - $205 The clear winner here for me is the SSI Technologies sensor based on it's both its clarity and relative price between both Honeywell sensors and the Fluke PV350 . I believe the SSI Tehcnologies sensor provides the best overall value as I don't have a school budget at my disposal. =] VIDEO IDEA?: Would be great to see a video on the comparison of commonly available 'Low Amp Probes' using the Picoscope, and maybe even comparing some larger scale Amp Probes to re-enforce some of the reasons a '600AMP Clamp' might not cover all of the required uses in the automotive field. And comparison between budget options vs more expensive options.

Really good stuff here. Thanks for the video

Good video thanks

Good video ! Thank you !

Thanks

Well done thanks

The "blue box" is a 10 turn trimmer potentiometer.

Stumbled on a gold mine

Hi do you have a step by step tutorial on how to make the ssl 500psi including wiring it up.Thanks

Thank you Sean, what a cool video! Hope to see you at ATRA again this year!

Very well done. Pls my question is if I don't have vacuum machine how can I use the transducer?

Can i use this kind of pressure transducers to measurement vaccum in intake mainfold ?

You should have filtering capacitors on the input and output pins for noise and transients.

So the real running compression is only about 60PSI on this engine?

@siuautomotive

3 жыл бұрын

Yes, when an engine is idling and pulling strong vacuum, not much air enters the combustion chamber, so there’s not as much to compress. Cranking vacuum is very low, like 1-3 in hg because the engine is rotating relatively slow. So during cranking, the engine is able to take big draws of air and that allows for a higher compression measurement. If I were to snap throttle with it running, you would see the running compression jump near cranking compression values.

Where did you foud the ssi 300 psi at 125 bucks? I found it at over 200 bucks on various sites

@siuautomotive

3 жыл бұрын

The ssi was a 500 psi sensor. www.digikey.com/en/products/detail/amphenol-ssi-technologies/P51-500-A-B-I36-4-5OVP-000-000/1665820?s=N4IgTCBcDaIAoFYCMBaBAGdKCCKBCKAkgMwBsKALGgPIBqcIAugL5A

For a running test do you have to disconnect the fuel injector for the cylinder with the transducer in it? Is the secondary ignition wire that's being monitored at 13:10 just going to ground?

@siuautomotive

11 ай бұрын

You don’t have to disconnect the injector. Usually the pcm cuts fuel once it detects a misfire anyway. I don’t run the engine for a long period, so it’s really not an issue. Yes, on that secondary, you can just ground it through a test plug. You can also see the ign timing by tapping into the coil signal wire as well.

The discrepancy with the expected time between spark and peak compression is about the time for the pressure wave to travel from the cylinder to the transducer at Mach 1.

@John-rw9bv

Жыл бұрын

The electronic circuits have quite a bit of delay too, but i suppose Mach 1 is a good point to make

I can't find the P52-500-a-b-I36-4.50vp sensor. Every time I type it in it goes to p51 not p52. Is there a difference between the 2? Any help would be greatly appreciated. I'm trying to build a decent incylinder pressure transducer.

@siuautomotive

Жыл бұрын

I think I typed it in wrong. That p51 should be good!

@lovetolearn5253

Жыл бұрын

@@siuautomotive 👌 i already ordered it. Your video really helped me alot. I ordered a nice clean adjustable volt regulator for my 5 volt out put. I was very impressed how clean that p51 sensor came out.

I can't figure out what I'm doing wrong, but I'm getting around 34 psi at the top of my waveform (the TDC traces). From the bottom trace to the top, I'm only getting 48.45 total psi. I've double checked I've got my cheap transducer set up like the settings in the video. This is on a 2007 4 cylinder Toyota Camry. Shouldn't my total psi be much more than I'm getting? Thanks for any help.

@siuautomotive

Жыл бұрын

I would need more details. What sensor do you have? What scope? Did you set a custom range? What’s the pressure range for the sensor? On my “gauge” 500 psi sensors, 350mv is -15 psi, 500mv is 0 psi, and 4500mv is 500 psi. Where your readings while cranking or running?

@Z14kt12timandjes1

Жыл бұрын

​@@siuautomotive Thanks so much for the reply. I have the same cheap 500 ebay transducer that looks like the one in the video. I set up the range as 380mv is -15 psi, 500mv is 0 psi, and 4500mv is 500 psi, and my scope is a Pico 4424. I took the waveform capture running only. Thanks for your video and helping me with this.

That looks more like Tallahassee FL. Great vid though.

Great video! I learned an awful lot. I was hoping to use in-cylinder pressure to control injection timing in a diesel, but since these use spark plug holes (obviously replacing the sparkplug) i suppose they're not capable of reading pressure in a working cylinder. What techniques/hardware is needed to essentially put the MAP sensor into the cylinder where, haha, it really ought to be :~)

@cardiaglexia995

Жыл бұрын

Warum schraubst du nicht einfach die glühkerze raus ? Du bekommst ein tolles bild deiner zylinderarbeit.lg & viel gesundheit für dich & deine familie.

@John-rw9bv

Жыл бұрын

@@cardiaglexia995 Sorry i can't speak German, but i translated with deepl. You can replace glowplug with pressure sensor, in fact Kistler sell a glowplug/pressure sensor combo for any diesel. They are very expensive though, and only used in research. Having said that, it is quite surprising all diesels don't have this sensor, as it can detect engine wear before it becomes a problem, and can increase fuel economy (particularly as the car ages). I suppose both of these things are good, not bad, if you are selling cars.

@cardiaglexia995

Жыл бұрын

@@John-rw9bv hello and sorry for my wrong language.i only if we screw in the pressure sensor instead of the glow plug , we get the same good values as with the benziner.lg and health. All good for you.

Nice video! whats the lowest psi the SSI 500 psi sensor can measure?

Why is the new pv350 not usable?

@siuautomotive

2 жыл бұрын

I don’t know what fluke did to the internals, but it doesn’t update the signal fast enough for in cylinder testing

Do you at all mention how is the sensor hooked up to the vehicle mechanically? I assume you did not drill the head.

@siuautomotive

2 жыл бұрын

I use a compression tester hose and go through the spark plug hole. Make sure you remove the schrader valve in the compression tester hose. Also, make sure you disconnect the coil or ground the plug wire.

@Rusefi

2 жыл бұрын

@@siuautomotive Oh the cylinder is deactivated :( Gotcha. I am looking to hack into a cylinder while it's alive.

@siuautomotive

2 жыл бұрын

Ah, the diesel instructor here does that, but he goes through the glow plug hole. He uses a different pressure sensor that’s much more expensive.

@Rusefi

2 жыл бұрын

@@siuautomotive fun fact: VAG and Opel have cylinder pressure sensors build into some glow plugs! stuff like PSG007

@John-rw9bv

Жыл бұрын

​@@Rusefi woooooooooaaaaaaaah, that sensor is only 80€ here in germany. I guess it would work the same way the sensors in this video work, albeit for a running engine. Also if you're from rusefi, thank you for taking an interest in diesel ;-)

Had me till you said in the upper atmosphere we'll float away because no pressure 😒😒🤣🤣🤣🤣

How to spot pv350 befor buy?

@siuautomotive

3 жыл бұрын

That’s the crazy thing! I don’t know if you can tell without pulling the cover and looking for that blue box. Honestly, if you have a pico or autel scope, I’d just get the ssi technology sensor

@happikon

3 жыл бұрын

@@siuautomotive thanks

@derrickdaly296

2 жыл бұрын

I cannot figure out what year it changed

This is really not your first rodeo. Really impressed with your knowledge you have in this field. GR8T gray matter food Thanks so much. Cheers from So.CA.USA 3rd House On the Right

The Fluke is way to dirty of a signal. Definite need to work with Filter. The Pico is a way better sensor.