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Sarah's Personal Cruiser
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Date:  5-2-2019
Number of Hours:  1.00
Manual Reference:  N/A
Brief Description:  Fuel/Air Sensor System for Engine Exhaust

One of the more useful bits of wisdom found on the web relating to engine sensors is a bit that Mark Langford included on his KR-2 site. That jem covers his use of an Air/Fuel Ratio gauge driven off of O2 sensors in the engine exhaust manifolds. The downside to that design was that it uses very inexpensive automobile components that are susceptable to errors. A follow up piece on WW's blog pointed out the potential problems in that setup and illustrated the more accurate setup used on the engine test stand that so many Corvair Flight Engines have experienced their first runs on. Of course Better and More Accurate readings do not come cheap and that DLG-1 Dual Lambda system, including dual Bosch LSU 4.9 sensors, from Innovate cost $312 through Summit Racing, The alternate, also through Summit, was $37 for the gauge, $17 each for the two oxygen sensors and $9 each for the two bungs at a total of $89 (plus shipping and handling). I always stress best quality and reliability in my project so I spent the dollars for the better system so that I can work it into the overall design on the FWF mockup.

1) The schematic for the original system.

2) Components of the new system. Top center are two steel bungs for mounting the sensors to the exhaust manifolds, Middle Lt and Rt are the two senders with attached cabling, Bottom Lt and Rt are the two extension cables for the senders that also change the connectors to something smaller, Middle Center is theLC-2 interface module along with extension/adapter cable used for one of the two senders (relays the data, via serial data bus, to the indicator which can only connect to one sender, Bottom Center is the DLG-1 Indicator itself.

3) The system as installed on the Firewall Forward mockup.
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Original Sensor System

Original Sensor System

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New Sensor System Components

New Sensor System Components

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