rx7 fc what can i use to premix
This question at hand may be ane of the nearly hotly contested for all rotarians. Not being shy at Rotary Operation to requite an opinion, we'll respond an unequivocal yep. Depending on the circumstances, both are absolutely correct. Allow's explore…
WHY PREMIX
Start, why is premixing, or for that thing oil injection required on a rotary engine? E'er since the primeval days of rotary engines, controlling wear of the noon seals has been a challenge. Noon seals have a unique place in the world of internal combustion engines. Rotaries operate similar a ii stroke engine. Every time a face approaches the spark plugs, combustion occurs. Dissimilarity this with a conventional 4-bike engine where the exhaust/intake stroke is cooler and lowers the estrus load on the parts. Heat builds and remains in the parts easier in a rotary engine. To add to this challenge, the apex seal travels the longest distance of all the engine parts. This whipping and wiping activity causes vesture bug and a propensity to chatter. Metallurgy and design helps to minimize the issue, but in the end lubrication of the surface is required. Having a thin boundary layer of oil assists the seals in remaining feasible for many years. From day one, Mazda has employed oil metering to automate the oil injection process. A small amount of oil is drawn from the oil sump and metered into the fuel and air stream to provide the sacrificial lubrication required. As years take progressed, Mazda has faced a standing challenge of providing the needed lubrication while however meeting the Us and globe emission regulations. By altering the injection location, injector numbers, etc. they have kept barely ahead of the standards. There are some years of rotary cars that the injection contour was so stingy, that information technology hands becomes a clothing event for the engine. Unless the car is operated in a all-time practices method, the engine will wear itself out prematurely. In addition to this, there are operating scenarios that crave more than than what oil injection alone can provide. Welcome to the world of premixing.
Let's continue with defining premixing. Premixing is the addition of sacrificial lubricant to the fuel for the engine. Well that sure sounds antiseptic. What it is to the layman is calculation oil to the gas to reduce vesture. What nosotros need to explore is defining who needs to premix, how much to add together, and what type oil.
WHO SHOULD PREMIX
Who needs to premix falls into three categories. One is totally obvious, but requires mention: The person who has deleted the oil metering system. There are those amongst us that desire a simpler nether hood look, operate the car in strictly motorsports scenarios or have a system that had failed and deletion of the system was the approach taken. In these cases, premixing is absolutely vital. Permanent and irreparable damage volition occur if it is not adhered to with every tank total. For this reason lone, we exercise not recommend ever removing the oil metering system. It is nice to take a fallback for non-sporting operation of the automobile.
Our adjacent category is those that employ their cars for occasional sporting uses. These are otherwise street driven cars. Frequently RX-7 and RX-8'south are used in weekend drivers training road form events (Drivers Border, Ferrari Club, PCA, BMW Club, etc.). These events commonly characteristic twenty minute continuous route racing. The boosted loads and heat cause wear to occur at a greater rate. In cases like these, it is ideal to add a pocket-size amount of premix to the fuel to supplement the already existing metering system. Other take a chance groups include occasional drag racers, drifters, street grudge matchers (shame on you), and cone bashing Machine Crossers. A little premix will go a long ways to getting every mile possible.
Our terminal category is the high take a chance cars where Mazda was peculiarly stingy on their oil metering. These cars are as follows:
- 1989-91 RX-7'south. This was Mazda'due south commencement electronically metered oil injection cars. The volume of oil injection dropped to about 25% of the preceding 1986-88 models. The results were shorter engine life, specially the automatic transmission models.
- 2004-11 RX-8's. Mazda worked hard to balance the requirements of the times. Emissions collection them to develop the first side exhaust port. Running the thinnest oil, smallest apex seals and a very modest injection rate made for a self fulfilling prophecy. The automatic cars from 2004-06 were highest risk. Premixing along with a couple additional changes effectively doubles the engine life of every RX-8 engine.
HOW MUCH TO PREMIX
If the determination is that you have to premix, the obvious question is how much to add? Let'due south go over a few factors. Turbo and non-turbo applications have different rates. Supplemental lubrication requires less than full premixing. Fuel types like gasoline require less than alcohol burners. Now let'southward look at specifics. Under ideal conditions, a typical street operated RX-vii or RX-8 will swallow a quart of oil between 1,500 and 2,000 miles. Past examining this rate of platonic consumption, nosotros can discern a recommended ratio of oil to gasoline. Let's calculate it out. Nosotros take the miles per quart of oil and divide past an average fuel economic system. For fuel consumption, 21 miles per gallon is a good average of different years and metropolis vs. highway mileage. With the variables at present known, we tin can bring it together. Split the miles per quart difference at 1,750 miles. Have this number and split up past 21 MPG. Nosotros now have 83 gallons of fuel consumed per quart of oil injected. Put another way, that's 32oz of oil per 83 gallons or 0.38oz per gallon or a ratio of 330:1. That means approximately 4oz per 10 gallons is the ideal consumption rate for a street car. For the high risk groups (1989-91 RX-7'south and the 2004-11 RX-viii'southward), 4oz of premix per x gallons of gas is exactly what nosotros recommend. Their manufacturing plant injection rate is so low that you well-nigh notice no oil consumption whatsoever.
Our next grouping is the weekend hot rod warrior. If you're planning to participate in a road class event, auto cantankerous, etc. It is recommended to supplement an already properly operation oil metering arrangement. Difficult operation of the engine puts more than stress than usually is experienced. To counteract this, a bit of premix makes for inexpensive insurance. This recommendation is actually focused toward the 3rd Gen 1993-95 RX7 oversupply. Their system is excellent, particularly when most cars take a PowerFC for engine management. This system allows for enhancing the injection rate through reckoner programming. Less premix is required for this situation and then 2oz per ten gallons is but fine. If you are participating with an RX-8 or 89-91 RX-vii, so you'll exist already premixing at 4oz per x gallons.
Our concluding group is the pure race car. On these, at that place is no metering system. Also, they often run an alternative fuel like Ethanol, Methanol or E85. On these cars, premixing is a bit of a science experiment. Every application is a bit different. Every bit a minimum, wait to mix 6oz per x gallons. On alcohol fueled cars, run an additional 2ozper ten gallons to counteract the drying consequence of the fuel. Of notation, it is not uncommon for many racers to run 1oz of premix per gallon of fuel. This is a lot of oil and can foul spark plugs easily. Many begin premixing rich and dorsum off slowly by reading the spark plug deposits. Excessive oily deposits on the plugs are a expressionless giveaway that the mix is likewise rich. Be careful to not reduce beneath 6oz for gas or 8oz for alcohol. Also little is far harder to recover from than too much.
WHAT TYPE OIL
Gasoline
There are 3 things to recall about premix oil. One is to use a premix oil specifically. "Sometime School" guys will remember using straight 30 weight motor oil as a premix. Delight do not do this. Standard engine oil has a tendency to non mix well in the gas tank. It will stratify itself with high concentrations at the lesser of the tank. What nosotros want to use is a production intended for the purpose. In reality, any premix will piece of work. In exercise, our favorite is synthetic premix. Idemitsu makes a wonderful production that is articulate, consistent and relatively smoke-free. Being a constructed, it has very consistent quality. Nosotros adopt the fact that it is clear and does not have dye. Premix that you buy at Abode Depot or Lowes is fabricated for the line trimmer and leaf blower world. It works fine, but is optimized for their world. They have a dye added to the oil to arrive easier for the lawn guy to know if the fuel has been premixed. For us, the long term effect of the dye is to discolor parts (like the plastic fuel pump associates of an RX-8). It also has a trend to discolor articulate or opaque fuel jugs. Beyond that, the oil works just fine.
Booze
When we are talking about booze, we are making recommendations for when the fuel is over fifty% alcohol. Below that and the gasoline is even so the majority and premix rules are still to base it on gasoline. Alcohol truly does use a different blazon oil. Why wouldn't it, since it'south different for everything else as well? The lubricity of alcohol is much lower than gasoline. Even 4-wheel piston engine folks apply a little top cylinder lubrication on high output booze applications. The standard premix of the alcohol earth is castor oil. Heed you, we did non say Castrol. Castrol is a brand and castor oil is a type of oil. Brush oil is a vegetable oil from the castor edible bean. It has characteristics that brand it the platonic oil for alcohol utilise. The nearly pop product is Klotz BeNol. It's well recognized and not unreasonably priced. It's sold in various quantities from half pints to quarts to gallons. Spoiler alarm: This oil has a funky aroma. If you've messed with nitro burning RC cars and airplanes, then you lot'll recognize it immediately. Proceed in mind, this oil is difficult to find in brick and mortar stores. If you're running alcohol consistently, you'll need a hefty quantity of this effectually so you never run out.
Determination
Nosotros hope this helps to clear the air (pun intended). Premixing is not necessary for anybody, but of import enough for many that a good explanation was needed. A couple of pearls of wisdom will follow to help.
- Don't forget to premix when the engine is replaced or has a major service. The oil metering lines are usually dry out until the system purges the air out. Mix it a little rich for this period, then eliminate or reduce the premix quantity to normal levels.
- Mechanical oil metering cars typically Practice NOT need to premix (1988 cars and older). Their system is reliable and adjustable to optimize the rate for the engine. Continue in heed, the systems are 25+ years old and are common to exist leaking then they may need to be serviced. Beyond that, they are effective.
- Many people volition use a iv ounce weed eater oil bottle to decant premix into to conduct with them. In fact, they often have several prepared in a Ziploc handbag. 4oz is the common book needed for 10 gallons of gasoline. Makes information technology easy to add Part A and Part B.
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Source: https://rotaryperformance.com/blogs/news/84479876-to-premix-or-not-to-premix