7mech

Seen how this topic is still going I will add another question to the mix. I've been adding premix for a couple of weeks now and have been wondering about this 100:1 ratio. Can someone please break this down into an ounce oil to 1 gallon of fuel ratio? I've been told to just add 16oz per fill up. Well this doesn't do it for me. I would like to have a little more flexiblity when adding fuel to my car cause whan I go to the track I like to have only 1/2 of a tank of gas when I get there, so that the car doesn't wiegh so much. also this would better help me get an acurate amount of premix oil added to my fuel. Thanks.

'79rx7

Off the top of my head .75 onces to the gallon, that's probably not right but close

needa86NAat

I have heard all kinds of ratios myself(from 16 oz per fill up, or 16.6 gal, to 4 oz per fill up). I am curious to so hard facts.

7mech

Well I did some research on some other sites and here's what I came up with. They say you should have anywhere from a 100:1 ratio to a 150:1 ratio and the optimal ratio is 128:1 which is basically in the middle. They said the 128:1 ratio equals out to be 1oz per gallon of fuel or 12oz to 14oz per fillup. You end up with 12oz to14oz because when you fillup there are still a couple of gallons of fuel left in the tank. Can anyone verify this with some hard facts from a raliable source?

7mech

Ok guys i called Rotary Performance today and talked with Chris Ott about this premix stuff. After all the different amounts that I was told to put in the gas I got confused and wanted some info from a source that I could trust. He told me that I should be running a 150:1 ratio. He did specifically say that this was for my year model 7, so I'm not sure if this will be a good ratio for someone who owns a different year model. The cool thing though is that he is sending me a copy of his spread sheet that breaks down all the different ratios. Hopefully this will contain all the info for all the year models. Mind you he is sending it snail mail, but when I get it I will be sure to post it for everyone to use. Anyways here is the breakdown of the 150:1 ratio. It equals out to .852oz per gallon. Which is equal to 11.928oz(rounded to 12oz for simplicity) per 14 gallons(average fillup amount). On my year model TII according to my FSM I have an 18.5 gallon gas tank. If you divide this into quaters it comes out to 4.625 gallons per quater. This means that you'll need 3.9405oz per quater tank. Yes I know this doesn't equal 11.928oz when you multiply it by 4, but you must remember that you're not filling up with 18.5 gallons of fuel most of the time. Usually you only put in about 14 gallons of fuel per fillup. Hope this helps some people. Hope I get that spread sheet soon so that I can make everybody better informed about premix.

7mech

Hey Revvin can you pin this topic in the FAQ section? I think this one has turned out to be alot better than the other Oil/premix topic that we have. Thanks.

methanol

Just a couple of questions I'd like to add to the fire, I've noticed that TC-W3 comes in semi-synthetic and mineral form, which one should I use? Also, wouldn't using premix lower the octance in your fuel? If, so how badly would it increase the chances of detonation? Any help would be much appreciated

pengaru

The reason a 2 cycle engine smokes is not exactly related to rotary engines.



the oil:gas ratio is much more oil rich on a 2 cycle and a 2 cycle blows a significant amount of unburned fuel right out the exhaust port throughout the RPM range, it's the nature of the beast. A peripherally ported exhaust on a rotary engine will blow some fuel right out at low rpm, but this isnt even true on the renesis but will always be true on a 2 cycle engine.



Not all premixed cars smoke, street driven ones generally don't but the racers put alot more oil in and try to get smoke, on a street driven 7 with premix of a sane quantity you shouldnt get soot or smoke. It shouldnt be much different from the stock oil injection in quantity of oil, and it should burn cleaner than the engine oil it was burning in stock form. I wouldnt be too worried about emissions WRT premix.

7mech

merthonal: I would suggest using the mineral oil and not the semi synthetic. The reason i suggest this is because mineral oil burns easier and doesn't leave as many deposits. Yes the premix will lower your octane rating but not enough to cause any sort of detenation. The reason that I know this is because I was adding about 2oz. more than I should have when I first started out and my car did not detonate at all. Hope this helps.

onboost

Unlike the 4 stroke oil, the semi-synthetic, or fully synthetic 2 stroke will will not leave deposite because its synthetic base. 2 stroke oil are designed to be burnt in the combustion chamber. So I wouldn't worry about that too much.



As for increasing chance of detonation, the 2 stroke oil burns better characteristic than 4 stroke oil, whose charateristic is slight exposion, thus decreases the octane point by a little bit.