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Thread: Rotary Engine Compression Tester
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admin
Administrator
Posts: 446
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posted March 01, 2005 01:03 PM |
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Rotary Engine Compression Tester
I got this idea off of a thread on the rx7forum.com, I've ordered the parts, and will let you know how it works...
Basically you get a pressure transducer, a serial A to D Data Acquisition unit, a sparkplug adapter to 1/4 ntp, and a laptop... For under $300 I think you can basically build a digital rotary engine compression tester!
Here are some links to get you started:
Setra 209 http://www.setra.com/tra/new/new_fc_209.htm#
Chart Recorder Starter Kit http://www.dataq.com/194.htm#
I ordered the 0-500 psi transducer from a supplier in Souther Cali, (see the sales offices for a place to buy one close to you. 500 psi should is a little overkill, but you never know what you could test in the future... They have a 250psi unit as well.
I'll report back when I get all the parts in and test my truck with it...
BTW, I had a very bad ping, think the front rotor is gone... the truck was never tuned correctly for colder weather, plus I just got done putting a front mount interecooler on, that dropped temps down, to where I don't think the ecu was tuned at all :(
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admin
Administrator
Posts: 446
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posted March 01, 2005 01:08 PM |
 Edited By: admin on 1 Mar 2005 16:09 |
Here's the thread as well
http://www.rx7club.com/showthread.php?t=389061
Looks like my buddy Blake is working on a complete unit as well.. If his comes out to be less than the DIY then go with that.. just have to wait until his is done
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klaus42
Rotorhead
Posts: 1877
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posted March 02, 2005 09:08 AM |
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Keeping my fingers crossed
...for you that all is not lost on your front rotor!
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admin
Administrator
Posts: 446
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posted May 26, 2005 04:55 PM |
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Works, bad engine
Just an update to this thread, I got the system to work about a month ago, and *front* rotor was gone.
I ordered a rebuid T2 from an 88 (rather than from a 91) and am in the process of putting it in.
If you're interested in getting a compression test via this method, just get the parts above and a laptop, and you'll be able to see the compression of each rotor :)
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bliffle
Revvin Up
Posts: 95
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posted May 26, 2005 07:04 PM |
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That pressure transducer is about $260 (gasp!) but I found one on ebay for about $50 (what the heck, all it is is a strain gauge thingee) but the chart recorder looks great for $25. the rest is just a 9v. battery (maybe a Zener to regulate it) and an A/D converter, all cheap from radio Shack.
All you gotta do is calibrate the gauge, but you figure a bicycle tire holds about 100psi so all you gotta do is jury-rig a shraeder or presta connector and calibrate against an accurate tire pressure gauge.
You can butcher an old spark plug for a fitting and braze on a suitable fitting (don't need an acetylene torch, MAPP will do, heck epoxy will probably do), probably for a swivel to spare dangling wires from the transducer.
B
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BadAssRX-7
1st Gear
Posts: 49
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posted January 06, 2007 05:30 AM |
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or you can buy 2 old school paper testers off ebay along with 3 comp. hoses and 6 wiring sets all for under 250$ then i went and bought 12 paks of testing paper. I charged 50$ a comp test and made money in no time :)
____________
83 limited edition rx7...T2 SWAP ON HOLD, 89 vert d.d., 74 rusted repu with 6port & Dellorto, 05 ZZR600
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