pre mix
 

just curious, what kind of pre mix is everyone using?

Idemitsu.

Whatever is cheapest of the name brands minus the generic crap like the WalMart house brand...
Right now that's Pennzoil from KMart @ $22 / gallon.
With the prices all over $5 / quart, it's getting expensive!
I used to love the good 'ole days when this stuff was under $3 / quart. :(


-Ted

is it any different from others?

alright i was leaning towards penzoil, ive heard valvoline/castrol were watered down a bunch?

and how much does everyone add per gallon of gas?

I was using Valvoline Multi-Use exclusively, until it started to climb over $6 / quart.
We've used Castro too with good results.
As long as it has the TC-W3 rating, it's good to go.
Yeah, the viscosity is a little different between the brands, but our teardowns show good wear.
We've run race motors (NA) with mostly Valvoline Multi-Use upping the ratio to 50:1 - 75:1 with good teardowns.

I normally just add half a quart (16 oz.) to a fill-up - 1987 Turbo II - which normally comes out to about 12 - 13 gallons, and the ratio comes out to right about 100:1.
For S5's with the bigger fuel tanks, if you do this, the ratio comes to just about 120:1 - 130:1.


-Ted

ok cool and sounds good, last question, since my oil metering pump is deleted, can i use start using synthetic?

I mix cheapo Wal Mart TCW3 oil in my non injected motor, I also use synthetic motor oil.

what weight?

Castrol SYNTEC 10W-40

Of course.


-Ted

Klotz Benol Castor Oil

I've been using what ever is available at wallmart, mostly penzoil 16oz bottles. Those are easy to carry around (while they are sealed), and I normally do a full penzoil bottle to a full tank which like Ted said its comething like 125:1 (I just avg the numbers)

alright cool thank you everyone for your input, really appreciated!!

Klotz here as well. Use it for anything that requires pre-mix.

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.

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 :banghead: lol

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.

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

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.

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

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?

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