pre mix

Pete_89T2 · 09-07-2012, 06:47 AM

FWIW, when I first installed the RA OMP adapter on my S5T2, I was adding the same premix lube to the gas at the typical rate Ted mentioned of 16oz per tank, which comes out to a ratio of about 128:1, fuel to oil. Did that mainly as an insurance policy, in the event my adapter install was all jacked up.

That first tank of gas rewarded me with a rather smoky exhaust, as the adapter was clearly working, so I was dumping more than double the necessary amount of premix into the engine. I continued to add some premix to the gas in the next few tanks of gas, but at much leaner ratios. Started at 8oz/tank, and eventually down to 2 oz/tank, while I tracked fuel consumption & premix consumption in the adapter tank so I could characterize it. The premix smoke/stink stopped being noticeable at about 4oz/tank.

After doing the math over about a dozen tanks of gas, it turns out the adapter (with my stock electronic OMP) delivers premix to the engine at an average rate of about 100:1. Given these results, I no longer bother to add any premix to the gas, I just top off my premix tank when needed.

09-07-2012, 06:47 AM	#15
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	FWIW, when I first installed the RA OMP adapter on my S5T2, I was adding the same premix lube to the gas at the typical rate Ted mentioned of 16oz per tank, which comes out to a ratio of about 128:1, fuel to oil. Did that mainly as an insurance policy, in the event my adapter install was all jacked up. That first tank of gas rewarded me with a rather smoky exhaust, as the adapter was clearly working, so I was dumping more than double the necessary amount of premix into the engine. I continued to add some premix to the gas in the next few tanks of gas, but at much leaner ratios. Started at 8oz/tank, and eventually down to 2 oz/tank, while I tracked fuel consumption & premix consumption in the adapter tank so I could characterize it. The premix smoke/stink stopped being noticeable at about 4oz/tank. After doing the math over about a dozen tanks of gas, it turns out the adapter (with my stock electronic OMP) delivers premix to the engine at an average rate of about 100:1. Given these results, I no longer bother to add any premix to the gas, I just top off my premix tank when needed.