premix, what are the effects of the octane levels??

[richard cash]

Im just wondering about premixing, im not intending to do it but more of an interest.

what happens to the fuel when you "dilute" it with oil. Surely say optimax wouldnt remain at 98 ron and so it would reduce meaning it couldnt be tuned to as much power. And with the same thought, if youve had a car mapped on a certain fuel then you shouldnt add 2stroke because it will create more det.

[maximtaylor]

The amount of oil is so little, it does not affect the tune.

[Grizzly]

They say Synthetic 2 stroke oil is also designed not to effect the octain level so even though its small quantites it may be worth using good stuff.

[Mr_7]

why are you wanting to mix mix your petrol?

i take it this is for your fd- what bennefits are you expecting from that?

[richard cash]

personally im not doing it but aparently 2stroke oil can be mixed with the petrol to give lubrication to the seals. This way all the oil pump and metering system can be thrown out and it means theres always lubrication. Assuming you never forget of course. Ive also been told that you can keep your oil system and just add 2stroke in 200:1 ratio. this way if your oil system does go then youve still got lubrication until you get the problem fixed.

[Grizzly]

I woud\'nt bin the stock Omp unless its not working or your using an EMS that does\'nt have a Omp Driver.

BUT!! as alot of people will tell you pre mix is a more efective way of oiling the Internal parts (apex\'s etc) and for a motor that is getting alot of abuse or running big hp you want to make sure its as well lubed as possable at all times so if you use synthetic that does\'nt drop your octane levels at all why not??

[Mr_7]

i see makes sense you can loose the pumps etc but the hassle of filling up and getting the right ratio would be a nightmare alot easier just to leave it.

i can only think like grizzly said it would be used in extreme conditions. the two stroke principle works well and is (correct me if im wrong) more eficent than four stroke however its hard to regulate and fit in with eu laws hence them dissapearing

[Grizzly]

however its hard to regulate and fit in with eu laws hence them dissapearing

Sorry this confuses me? Pre mix is\'nt a stock feature on the engines? The 2 stroke oil is designed to burn cleanly and not leave and deposits, the std 10/40\'s is not designed to burn and so leaves deposits arount the hot area\'s of the engine (apex grooves, Rotor housings etc) if anything the Cleaning agents in the 2 storoke oil helps brake down the Oily deposits left but the oil. But whats even worse is the deposits left by Syntetic 10/40\'s type motor oil which is also not designed to burn (well 90% of them Royal Purple excluded) they tend to block up the oiler holes in the housings causing lube problems.

[Mr_7]

i see yes but thats in the case of a premix fuel system in the case of two strokes its hard to regulate as there are only two strokes per cycle so to get eveything in and out is hard where as a four stroke os more accurate no?

[Grizzly]

Sorry your over Complicating it, every time a bath passes the oiler (the small hole drilled in the rotor housing above the inlet) there is oil droped onto the Housing and the apex\'s scrape it up thus oiling, the Pre mix basicly does the same but it is sprayed in with the fuel as a vapor so it covers more of the Rotor/Apex\'s etc quicker. its not like a Boinger where there is two strokes an inlet and an Exhaust the rotary is one action the whole Intake exhaust etc is one rotation of one bath (if you gt where i\'m coing from?? basicly one rev of the Rotor does it all)

[Mr_7]

yes that makes loads of sense now thinking bout it, lubing the whole revolution. is there many people that have done this conversion then i see it as a ag but with hughe benifits

[monkey-fd3s]

I\'ve just removed the OMP on my street driven car and am running pre-mix.

I had a frank discussion with the tuner who built my engine and they were more for it than against it.  As long as you have a good memory you will be fine.

I am using a 1/120 ratio of oil to fuel and just using the same oil I use in the engine; this was the reccomendation from the engine builder so I\'m more than happy to follow these instructions.  Essentially for 70 Litres of fuel (think that\'s what the tank holds) would mean 600ml of oil.

Got a nice 1L oil safe container to make the petrol station/fill ups clean and easy and I can measure how much i\'ve put it.  

I just pop the oil in first then fill up the tank

[Grizzly]

O course you know not to remove the OMP with a stock ECU don\'t you

[Red and Single]

I can\'t imagine any tuner telling you anything other than premix is a far superior solution to apex seal lubrication. It just has to be better.

Not only that but as I understand it if you bin the OMP then you can run super high grade synthetic oils in the engine too offering more protection all round !!

[Headmaster]

This is a very interesting thread...