Snap on pressure transducer

Darryl Technician Patchogue, New York Posted   Latest  

Has anyone had good results using snap on verus with there 500 psi transducer doing in cylinder wave forms i cant get clear vacume pocket or iv-ex pattern peaks or ok i tried diffrent time settings and psi settings i called snap on tech so far guys i have talked with aren’t familiar with in cyl anaylsis

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Chris Diagnostician
Lansdale, Pennsylvania
Chris
 

That's been my go to so far. I've had pretty good luck, though the resolution is not nearly as good as the WPS500 from Pico. Shop Stream waveform analysis capabilities is pretty lacking. Couple questions for you, but maybe you can upload a screen shot of one of your captures, that may help me better. These are my settings from the particular capture.

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Joel Diagnostician
Soquel, California
Joel
 

where did you get the hose ? I used one from regular comprecion tester of course without the shreded valve .

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Chris Diagnostician
Lansdale, Pennsylvania
Chris
 

Just a regular OTC compression tester hose with the Schrader valve removed.

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Joel Diagnostician
Soquel, California
Joel
 

I have used different with same result i got tire of that , bought 2 differnt brands working great . I wanted to sell it to some point but I do not want to sell some thing does not work not usable . thanks for your inputs.

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Darryl Technician
Patchogue, New York
Darryl
 

Thanks for the screenshot i have mine set to the same settings doesnt have the same clarity could it be the hose .iam usinng a top dead cylinder whistle tool hose with no schradder hose isn’t same diamter as a compression hose

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Chris Diagnostician
Lansdale, Pennsylvania
Chris
 

Darryl, See Chris Martino's reply at the bottom there. He is spot on. There is fluctuations in the rubber compression hose that can dampen, for lack of a better term, the air pulses.

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Darryl Technician
Patchogue, New York
Darryl
 

Thxs

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Joel Diagnostician
Soquel, California
Joel
 

I have been using the same hose on 3 transducer, pv350, one from russia (beautifully waveform) snap on is the only one makes the mess, mine is good wave form except my 0 psi, exaust stroke is on the scale of about -20 psi , can not measure actual 0 psi other than that is good for timing , before engine start is 0psi

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Daryll Diagnostician
Seymour, Tennessee
Daryll
 

The Snap-On 500 isn’t built to respond properly for in-cylinder. The sample and refresh rate is 10x slower than a Pico WPS. I’ve got both units, and there’s not many similarities in the 2. I’ve found that my SO 500 deviates from actual really quick, and have recordings to support it. Could just be the one I have tho

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Chris Diagnostician
Lansdale, Pennsylvania
Chris
   

I agree with the refresh rate. I dont own a WPS, though I have borrowed one. I guess I've been lucky with the deviations, if present on mine, not creating issues. Maybe I'm lucky? More likely, the failures have been drastic enough to not be masked by the response rate. I also use mine more on diesel than gassers so that's another variable. Above captures just happen to be a gas engine.

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Chris Technician
Bryans Road, Maryland
Chris
 

I have also had the same issue. I was also told and have heard that it cant handle the pressure changes of in-cylinder. So I just used it for other things till I got my WPS

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Chris Diagnostician
Commack, New York
Chris
 

to get a proper signal, you will need to use a solid pipe or hydraulic hose type adapter. You will also need to adjust your time base and pressure scaling to see the proper amount of detail. Some people have issues with their transducers not going below zero, this is not my experience. If used correctly, you will served nicely by this setup.

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Darryl Technician
Patchogue, New York
Darryl
 

Yes iam using a brass tee from fuel psi gauge .ive tried moving settings scree Quality is not the same as your getting i think it may be the hose or adapter thank you

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Jim Mobile Technician
Southampton, Pennsylvania
Jim
 

Chris, You are "Spot On", but I can tell you that way back when I started using the in-cylinder pressure procedure with my 1st generation Modis and my "Normal" compression hoses I was receiving very good quality waveforms. I started reading more and more about how the "Normal" compression hoses were not working right ???? It finally dawned on me that my compression gauge set was older then most

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Darryl Technician
Patchogue, New York
Darryl
 

Thanks for the input

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Walter Technician
Sarasota, Florida
Walter
 

I have one and have had no issues with it. I do get a better signal with the adaptor that plugs in to the back and powers off the scanner rather than the 9v adaptor. I even created a custom probe and use it with my Pico. Wps500 is on the wish list

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Darryl Technician
Patchogue, New York
Darryl
 

Thanks i have the adapter that plugs in

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Matthew Mobile Technician
Bartlett, Illinois
Matthew
   

As others said - it is part the transducer and part the hose. I would recommend buying the Pico hose and putting a Foster fitting on your transducer. Many people think that the main issue with traditional compression test hoses is the flex or dampening. While that may be an issue, the biggest problem with them is the amount of volume you are adding to the cylinder. Pico's hose has a Teflon hose

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Joel Diagnostician
Soquel, California
Joel
 

I bought the pico hose same crappy signal .is the teansducer, if snap on claim the hose be the issue I ask them why they do not sell the proper hose , I was on technical support at higher level at that time because I watedto return it.

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Bill Owner/Technician
Jackson, Michigan
Bill
 

I would NOT recommend the SO transducer for in cylinder... Doesn't hold zero line well and refresh is slow which results in poor test results Go with the Pico otherwise your just trying to do in cylinder

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John Owner
Medford, New York
John
 

Darryl, As others have stated hose setup can cause an issue. Time base and setup can cause issues as well. With that being said and since you are in my backyard I would be happy to stop by and give your setup a look to see if I can get you going. I have been asked by many Snap On dealers and TM's to assist in matters with tooling and usage. Email me at … and we can setup a

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Darryl Technician
Patchogue, New York
Darryl
 

Will do thanks

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Joel Diagnostician
Soquel, California
Joel
 

mine I could never make it work the first one I got it replaced and second same thing , I call support they said the hose is the issue has to be the same dimension than the transducers, I said sell me the hose they said they do not sell it. what I get is the vacuum pocket go to negative pressure about -25 on the pressure scales how ever I have used the same hose with 2 more transducer with out

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Darryl Technician
Patchogue, New York
Darryl
 

Are both screenshots snap on?

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Joel Diagnostician
Soquel, California
Joel
 

yes but the one where I have 3 cahnnel actually had and issues the cam phasers was stuck on advance how ever still the exhaust pocket is not actual pressure

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Dmitriy Analyst
Toronto, Ontario
Dmitriy
 

Joel, this is a severely offset signal, definitely not a hose. Is it correct that the pressure transducer gets its 5V power supply from the Snap-On Scope itself? Is it possible that something is wrong with that reference voltage (less than 5V or connector issue)? Very interested in knowing the real reason for failure.

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Joel Diagnostician
Soquel, California
Joel
 

Yes IT is getting the power from the verus. before I had my previous verus and it fail, I trade in for the verus pro, same result on scope waveforms. so at the the shop we have the verus pro same result , I got a replacement unit from snap on second same , I fight to return it but there is snap on for you they send me to 3 level of support with out revolving the issues I sent him captures of

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Chris Diagnostician
Lansdale, Pennsylvania
Chris
 

Dmitriy, Here is my set-up. My vantage meter accepts the pressure transducer directly and powers it. Due to the nature of the meter itself it's not great for in cylinder. For my verus and verus edge, I use this set up which is a splitter box with a 9V that powers the transducer. I've had decent luck though, as others have said, it is no substitute for a WPS

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Darryl Technician
Patchogue, New York
Darryl
 

Thxs

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