DIY Digital Compression Tester
#1
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DIY Digital Compression Tester
...found and interesting thread on another forum..
DIY Digital Compression Tester
http://www.illstreet.com/forums/show...9552#post39552
sometimes the server is really slow...
DIY Digital Compression Tester
http://www.illstreet.com/forums/show...9552#post39552
sometimes the server is really slow...
#2
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I've thought about this many times before...
Making a DIY compression gauge would be pretty danged simple. All it takes is a sensor, a fitting/adapter, a DAQ card, and a laptop. I already have a DAQ card and laptop (pretty nice and flexible USB DAQ cards could be had for ~$100). Digikey has adequate sensors for pretty cheap (much less than the $103 one this guy was looking at). A little time at the lathe would give me a plug-to-sensor adapter. Voila!
Hasta,
Shad
Making a DIY compression gauge would be pretty danged simple. All it takes is a sensor, a fitting/adapter, a DAQ card, and a laptop. I already have a DAQ card and laptop (pretty nice and flexible USB DAQ cards could be had for ~$100). Digikey has adequate sensors for pretty cheap (much less than the $103 one this guy was looking at). A little time at the lathe would give me a plug-to-sensor adapter. Voila!
Hasta,
Shad
#4
RX-7 Bad Ass
iTrader: (55)
Kick ***! I'm all up in that!!! I've been wanting a Mazda compression tester for a while, and this is much cheaper .
Thanks!
Dale
Thanks!
Dale
#6
RX-7 Bad Ass
iTrader: (55)
I believe the data acquisition unit comes with the software. Could be mistaken.
BTW, the pressure transducer is an Ametek P207. It's in stock at various other places, but for $190 or more. Ack! I might have to see if our local Grainger stocks that part.
Dale
BTW, the pressure transducer is an Ametek P207. It's in stock at various other places, but for $190 or more. Ack! I might have to see if our local Grainger stocks that part.
Dale
#7
Racing Rotary Since 1983
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i currently run something similar to a digital compression tester and there may be some crossover....
i log exhaust manifold pressure EMP (backpressure). that'd be between the engine and the turbine.
i use a Honeywell Pressure Sensor Monolithic Signal Conditioned. 4000PC Series
catalog number 4040PC150G4D w Packard connector or G5D w leadwires.
i bought and use 2 of them (fuel pressure logger) on Ebay for $40 total.
as to logging/recording pressures digitally.............
they key is to have lots of samples per second as the compression is dynamically always changing and your sample only reads for a very small time period. i see this as i review my EMP readings.
granted the engine will be cranking at only approx 250 rpm which helps a bit.
the sensor runs off 5 volts so you can get a feed from, your MAP sensor if you wish.
probably an easy thing to make.
howard coleman
i log exhaust manifold pressure EMP (backpressure). that'd be between the engine and the turbine.
i use a Honeywell Pressure Sensor Monolithic Signal Conditioned. 4000PC Series
catalog number 4040PC150G4D w Packard connector or G5D w leadwires.
i bought and use 2 of them (fuel pressure logger) on Ebay for $40 total.
as to logging/recording pressures digitally.............
they key is to have lots of samples per second as the compression is dynamically always changing and your sample only reads for a very small time period. i see this as i review my EMP readings.
granted the engine will be cranking at only approx 250 rpm which helps a bit.
the sensor runs off 5 volts so you can get a feed from, your MAP sensor if you wish.
probably an easy thing to make.
howard coleman
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#8
Warming the planet.
I recently built one and it works well.
I got the inspiration from Fdjunkie’s thread;
https://www.rx7club.com/showthread.p...1&page=1&pp=15
The wave pattern shows a small “wiggle” at the valley, is this from the ports opening and closing or from the shape of the chamber?
I got the inspiration from Fdjunkie’s thread;
https://www.rx7club.com/showthread.p...1&page=1&pp=15
The wave pattern shows a small “wiggle” at the valley, is this from the ports opening and closing or from the shape of the chamber?
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