EnduroDude
Member
- Jan 21, 2003
- 100
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Originally posted by EricGorr
Theres a raging debate about that.
You may have run across it already, but this guy's site is
one of the best I've found http://www.eric-gorr.com/
I talked with him on the phone once, he couldn't be a nicer guy, and he really knows his stuff.
Some tuners believe in placing oxygen sensors in the convergence cone of the pipe, others claim it won't work because there is so much raw fuel traveling through a pipe because of short circuiting.
Karters use temperature sensors to monitor exhaust gas temperature to shut the engine down before a seizure occurs. I use an OPTAK, a now defunct company that made a combo EGT/RPM gauge designed for the harsh off-road motorcycle environment.
Its very difficult to get a dirt bike up to temperature, and the 1100F target can only be achieved at wide open throttle. When riding enduros through the woods the average EGT is 400-600F measured 6 inches from the exhaust face of the piston.
I advocate the Ride and Feel jetting method, because throttle response is subjective to rider skill.
Originally posted by Rich Rohrich
Here's a thread that had some interesting info on the subject:
http://dirtrider.net/forums3/showthread.php?s=&threadid=37556
Originally posted by EricGorr
The link worked fine for me. Theres a good post by Sean Hilbert that explains the O2 question.
Thanks for the link Rich, as usual you know where all the goodies are hiding!
Originally posted by Rich Rohrich
You can find the above thread in the Advanced Technology Forum the Subject is "Injected two strokes"
An alternative that you might want to consider is http://www.jandssafeguard.com/monitors.html . This device is designed to work with the Bosch LSM 11 sensor . More info on this is available from Dr. Dave Redszus at Precision Automotive Research, at (630) 766-4402
Originally posted by EricGorr
Theres a raging debate about that. Some tuners believe in placing oxygen sensors in the convergence cone of the pipe, others claim it won't work because there is so much raw fuel traveling through a pipe because of short circuiting.
Karters use temperature sensors to monitor exhaust gas temperature to shut the engine down before a seizure occurs. I use an OPTAK, a now defunct company that made a combo EGT/RPM gauge designed for the harsh off-road motorcycle environment. Its very difficult to get a dirt bike up to temperature, and the 1100F target can only be achieved at wide open throttle. When riding enduros through the woods the average EGT is 400-600F measured 6 inches from the exhaust face of the piston.
I advocate the Ride and Feel jetting method, because throttle response is subjective to rider skill.
Originally posted by RustyS
How did you arrive at the 6" form the face of the piston (that is what I use) since I installed mine at 6" I have read that the probe needs to be installed before the "wet line" in the head pipe so the fresh air/fuel that is drawn into the pipe does not cool the probe and give false readings.
After reading about the 'wet line' I pulled my pipe looking for the wet
line but only found a dry head pipe, then pulled the head and looked into the exhaust port and could see the wet line before the exhaust manifold.
I know each engine will be different and even the same engine will vary when it has been modified, carb, porting, pipe etc.
How important is the location of the probe to get a accurate reading?
From what I have heard the oxygen sensors don't last long because of the oil and rich mixture when the jetting is off or the engine is cold, too bad there was not a way to shield the sensor until the engine was close to operating temperature....
Originally posted by EricGorr
Theres a raging debate about that. Some tuners believe in placing oxygen sensors in the convergence cone of the pipe, others claim it won't work because there is so much raw fuel traveling through a pipe because of short circuiting.
Originally posted by tzracer46
What you need to do is install the gauge, and run the bike on the dyno and jet the bike until it makes the best power, and then look at the number on the display. Then when you go to the track watch the display and jet for the number you found on the dyno that gave the best power. Hope my insight helps
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