pre mix

[Pete_89T2]

Originally Posted by Raksj04

What about using an adapter on the omp, what type of oil would you recommend?

Same stuff - you would still use a TCW3 rated lube, but with the OMP adapter installed, you no longer need to mess with mixing it with the gasoline at every fuel fill up. Just dump it in your OMP adapter's oil tank that you fabricated, and top off the tank when needed.

[knonfs]

Originally Posted by Pete_89T2

Same stuff - you would still use a TCW3 rated lube, but with the OMP adapter installed, you no longer need to mess with mixing it with the gasoline at every fuel fill up. Just dump it in your OMP adapter's oil tank that you fabricated, and top off the tank when needed.

I sometimes wonder if pre mixing in the tank lubricates better than the OMP adapter. Not sure if its a myth, or not. I am kind of tired of pre mixing every time I fill the tank up lol

[Raksj04]

I heard it maybe harder on the fuel injectors when you premix they aren't designed to use premix. also when you engine brake there is no fuel going to the motor, and if you premix there is also no oil going to the motor.

[RETed]

As long as it carries the TC-W3 certification, you should be fine.
The TC-W3 certification has standards for performance, and flowing through fuel injectors should not be a problem.
The details:
http://www.nmma.org/certification/ce...oil/tc-w3.aspx

As for no lubrication on decel...
There are some tidbit in the above link.
Internal lubrication is a combustion by-product of the pre-mix burning.
Unless you're doing some really extended decel periods, it's not a concern.
Remember, the winning 4-rotor 787B @ LeMans ran pre-mix with decel fuel-cut off (this is primarily for fuel economy); internal engine wear was not a problem.
This has all been documented in tech papers - i.e. SAE papers, etc.
If it really matters, it was running Idemitsu pre-mix.


-Ted

[Pete_89T2]

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.

[low compression]

I trade in my bg chips and get bg premix free and it seems clean burning according to
Last teardown at 10000

[therex]

sorry to bring this back but im using Pennzoil and doing about a 100:1 ratio, if i put too much will i get worse gas mileage? and is that the best ratio to be using?

[RETed]

If you use too much, the immediate effect is that you'd get significant smoking out the exhaust.

Keep doing it and it'll foul the spark plugs, so all effects with fouled spark plugs are in effect.
Short answer - yes, this can affect gas mileage.
If you're worried about fouling, check your spark plugs every few hundred miles.


-Ted