who here premixes?
 

ive been reading about premixing and am considering doing it myself. before i did though i just wanted to see how many people premix and what they think about it. ive done my homework i just want some personal opinion. thanks.

cant hurt and its not very expensive.... all to help the motor. Thats my take

im rebuilding my motor and highly considering premix


i rarely checked my oil between oil changes and the oil metering pump used about a qt every 1000 miles. But this was a 120k mile old turbo motor, and the s4 turbo OMPs dump lotsa oil in.

So I am NOT going to use the stock OMP setup.

My only options are

1) Rotary aviation makes a part that bolts onto the OMP and feeds it oil from a seperate tank so you can fill it with whatever type of oil you choose, regular engine oil, 2 stroke premix, etc. This way your OMP injects from a seperate container and doesnt lower the level of your engine oil which does a decent chunk of the internal engine cooling along w/ lubrication.

2) Block it all off and just run pre-mix



Option 1) goes along w/ my everything upgraded to some new fangled gizzmo approach, but I don't know about that.


The stock OMP injectors don't coat the entire rotor, they coat the center area leaving the sides less lubricated.
People have posted up pictures of the internals after tearing a high mileage motor apart and this is very common.

pre-mixing w/ your fuel seems to do a better job at lubricating evenly




I'm definately considering just pre-mixing all the time.
You keep the premix in your hatch, do it everytime you fuel up. Becomes like second nature to you.
Never have to open your hood except to change your oil every 3k miles or so. Oil level doesn't change.


Then again, rotary engine w/o lubrication in the combustion chambers will turn to utter shit in about 15 minutes or less.

I don't see anyone fueling up my car but me, so I don't feel this would be a issue about forgetting to premix.




So, I didn't answer your thread, just blabbed on about what im planning for my car.

good luck w/ your thread :)
-Ben Martin



P.S. My engine builder told me to keep my OMP or do the Rotary Aviation piece, but also add a sprinkle of premix in the gas as well. Too much effort for me.

one thing i like about premixing is when i take my intake manifolds off there not covered inside with black oil.

I premix..

Rat

i premix also

I plan to premix next summer

I've been premixing lately because my metering oil pump cable was having issues (I have already made new brackets to be installed in the spring).

Overall I'd say that it's a raging pain in the ass. It adds an extra step to an already annoying process (filling up), costs more (two stroke oil is about $4 a quart here), is messy (you WILL get oil on you, and you WILL smell like fuel), and in my opinion is wholly unnecessary if you have a working metering oil system.

And there's the stupid questions asked by onlookers.

I like the stupid questions by onlookers

Dave

well my lines are all broke on my s4 and there like 30 bucks a line, is there a place you can just buy the lines and cut them to length and attach them yourself?

I premix and plan on going back to the OMP whenever I have time to do so.

https://www.rx7club.com/2nd-gen-archive-72/rebuilding-omp-oil-injection-lines-348068/

Any hydraulic shop can make you new lines. You can also make your own. Search "rebuild metering oil pump lines". I think the topic is also in the archives.

thats why I started premixing, broke a line - too expensive & im too lazy to fix it :)

I am going to pre-mix with my next/current motor as well. After reading that the OMP nozzles don't spray, per-say, and only drip oil onto the rotors, and ONLY into the middle of them, I decided to give it a try.

Read about some people tearing down OMP used engines, and also tearing down engines that were pre-mixed, and the difference was night and day (with premix being cleaner, at least). I have blocked off the OMP, removed the lines and nozzles, and will be putting bolts in their place.

James

fuck premixing, it is the biggest pain in the ass ever. i use penzoil 2-stroke oil, and it stinks. my whole damn car smells like the shit, cuz i dont have a/c, and the windows are always down. It also makes it smoke worse at certain times, cuz its puttin more oil than is needed in the gas. cuz the stock omp, injects different amounts at different rpms. with premixing, its the same amount all the time. Id say good for racing. but shitty for daily driving. i get like 16 mpg. and i fill up alot. and having to pour the damn oil in the gas is nasty. its sticky and obviously oily. when ur on a date, u dont want to have oily damn hands and smell like fuken oil all the time. im goin back to oil-injection asap. soon as i get new oil lines. its goin back on. It sucks. but if anybody is dumb and wants to do it, i have the block off plate, and will sell it if somebody wants it. but seriously for daily it is dumb. just check ur oil every day or two, and u wont fuck shit up. also an op guage is a good investment. trust me.

also, premixing, it gets oil everywhere. it clogs ur fuel pump faster and makes it work harder. i had my walbro go out in a little over 1 year. all the shit inside the motor is covered in oil. manifolds, everything. sticky, nasty shit. get rid of it.

Your car isnt running right. I premix and my car smells fine...

Uhh.. My car doesnt smoke either. In fact, I have passed emissions with pre-mix in the tank.

Oh, btw, the OMP injects oil based on THROTTLE POSITION, not RPM.

Again, your car isnt running right...

LMAO!!

Then my 3 year old Walbro that just made 490 horse must be some form of fluke!! How much damn oil were you PUTTING in that tank?!?!

im getting 18 city in my 1oz/gal premixed S4 n/a

i hope so!

premixing has become second nature to me its not hard or out of place at all.

i also premix, i dont want to risk the chance of the pump failing, an injector getting clogged or a line breaking

fuck it, my car runs fine, i run 1 oz. to the gallon. thought it would be helpful. premixin is a pain, but if thats the way u wanna go, fuck it. L8r asses

i run 1 oz to the gallon. no issues, and passed emissions with little to no emissions.

Been premixing for a few months now, starting after my turbo swap. Its a pain in the ass to begin, but its totally second nature now. I started to pre-fill a half-dozen pop bottles, and throw 'em behind the seat... takes 20 secords (if that) to premix at the pump. its not that hard to empty bottle of oil into the tank, without spilling. And I've yet to find a service station without paper towel racks within 15 feet of the pump

It might be still early, but I love the strange and stupid questions of on-lookers. Gives me a chance to brag and showoff the 7 :)

ok so do u premix before u ad or just add the oil then fill the tank?

Dave