Posted November 10, 2007 - 06:38 PM
Posted November 11, 2007 - 07:58 PM
I'm a jetting freak, i love having my bikes jetted right on the money
Then you should just go and buy a wideband.
Posted November 13, 2007 - 12:56 PM
Posted November 13, 2007 - 08:29 PM
Posted November 13, 2007 - 09:00 PM
Posted November 14, 2007 - 12:44 AM
Posted November 14, 2007 - 06:16 AM
Nitrous, I know wide band is being used on 2stroke, but I don't understand how it can provide consistent results considering the charge short circuit throwing off the O2 sniffer???
Quite a while back I had the same question and I received this answer from a very knowledgeable and trustworthy source:
The pressure waves used for an advantage in a two-stroke expansion chamber are finite amplitude waves, and they work pretty much independently of the actual gas flow in the exhaust. In other words, the gas particles flow out while the finite wave pass back and forth. Once you get far enough away from the exhaust port (say the dwell section of the chamber) an O2 sensor will respond correctly and send accurate information.
It makes sense when you sit back and think about it.
Posted November 14, 2007 - 07:43 AM
For those that dont know what charge short circuit is, it is the charge that is lost directly out the exhaust port between the primary (the transfer port closest to the exhaust port) and the exhaust port without making the intended loop around the cylinder. In a perfect scenario all the charge is pointed toward the rear of the cylinder and the boost port circulates it around the head then down and out the exhaust port, that is what has been described as loop charged.
So my thinking is that the lost fresh air would show incorrect readings from a O2 sensor, and that compensating for it would be difficult as the lost charge is varies according to load and rpm. I dont have anything to back it up, just thinking........
on edit: and oh, keeping it with the piston was subject, you can see the short circuit "trail" of wash from the primary to the exhaust port.
Posted November 14, 2007 - 08:28 AM
Now back to the original topic! Sorry for the unintentional side tracking, hehehe.
Posted November 16, 2007 - 06:58 AM
Posted November 16, 2007 - 06:59 AM
Posted November 16, 2007 - 12:19 PM
Innovate LM-1 wideband kit:
Works well for me.
Posted November 16, 2007 - 02:32 PM
Posted November 16, 2007 - 05:20 PM
If anything, readings might be skewed by a tenth or two of an afr point when using the sniffer on a car.
Trying to play CSI forensics by reading plugs, piston tops or whatever is going to cover a MUCH MUCH MUCH wider AFR range (as in several AFR points).
Posted November 17, 2007 - 01:42 AM
I did a top end a few months back and the top of the piston was nearly perfectly clean, which was the first time I ever saw this on any of our bikes. If the bike were running rich I would expect to have seen excessive smoke and been fouling plugs, but this never happened. In fact the bike smoked less then most 2 strokes and if anything the plugs were a little lean and others have agreed.
The bike is stock with the exception of a V Force reed & Procircuit pipe. I forget the numbers but the main jet is one size larger then stock, the pilot is stock and the needle clip is in the center.
We are running 40:1, 100 octane gas, yamalube oil.
Posted November 17, 2007 - 06:32 AM
Posted November 17, 2007 - 04:53 PM
I am thinking of trying a Phathead and flat top piston in a few weeks so I will see what the current piston looks like when I take the head off.