Projecto8' - Oil 2T

[aspec_fc]

hey guys....premixing is almost an art as far as i'm concern. it may have good results and at certain cases, it may result in wearing off your apex seal, oil seal, coolant seal sooner than it should be. i can't say which is right or wrong but debates about premixing for RE has been going on for years and yet one has got a perfect formula to it. i suppose it's highly dependent on how the car is being driven. Whether is a daily driven or a weekend car, hard driving or grandma style driving. it all takes account.
one thing i know for sure, carbon kills rotary. carbon lock is the last thing you wanna have. premixing prevents or reduces carbon and gives a smoother ride depending on what you are premixing. too much premix or sometimes, too strong of a formula may eat up yer components. maybe by a hare? not sure. Just a scenario:

for example you got your RX7 and u're happy about it. engine sounds ok but could have been a little bit smoother. so you settle for premix solution. carbon has been in yer RE for some time now since the previous owner got too careful with the engine and never revved it up often enough. and one of yer apex seal is cracked. but what holds it from breaking was the sticky carbon. you put the premix in it and figured it would help the engine taking off some nasty gum. that's true. but once those nasty gums are off, WAHLLA....you've got a crack apex seal. and your engine's blown.

this is a scenario of a FC few years back. and some has seen cracked apex seal being wrapped by a layer of carbon. some does premix in their engine religiously every routine service for years and still have good results.

i personally tried ATF in my engine. 2 spoons of ATF in the engine from the trailing spark plug hole in each chamber. put the spark plugs back. took off the EFI fuse to crank the engine. had the ATF in there for 24 hrs. Start the engine up and take the car out for a drive. Redline the engine for at least 5-7 times if i remember correctly. white smokes all over. that's cool.....got back and change the engine oil to brand new golden engine oil. GOLDEN! if the car got smoother after i did that....ermm.....i guess it was just by a tad. i couldn't really tell the difference.
besides, what i did hardly pass off as a proper premix. is more like an advance use of seafoam. hehehehe.....

 

[quixeric]

i think 1quarter to a full tank is quite alot, as like u guys said, u can smell tat awfull smell pretty strong. the engine comes wit the omp as u guys said as well, so it already adding in the lube plus the 2t is kinda alot i guess. mayb 1/6 or 1/8 for a full tank. use it when go trek or long distance drive le, not daily usage.
im sure adding 2t will create more carbon, esp if u didnt drive it few days in a row then the carbon dries up n harden. the 2t is design to lubs and thus not going to burn or evaporate easily during combustion.

 

[- D i a b l o -]

i dont think its that much (a quarter of a 2T small bottle) for my car.Since i dont put it on every refuel. (allready 3 times refuel since the last addition) the smell is very faint now but it is still ultra smooth.

 

[Alchemis]

if engine is a little screwed... and detonation can happen easier with lower octane petrols.

therefore people invent octane booster ... and also high octane petrol... i think :)

higher octane is easier to burn... faster... cleaner... and more power

 

[- D i a b l o -]

i know that man
thats not it,im asking if we can use RON100 race fuel?

some users use 2t to step the octane down,please elaborate

 

[aspec_fc]

for all i know, higher octane gas will create more backfiring for our type of engine, RE. it can be annoying at times. and some has said that it doesn't really increase hp. so why go for it. FC engine was made at that era where 87 octane was the highest. so if we use anything higher than that, we're fine. RON100 burns better but too much backfiring for street driving.
correct me if i'm wrong.

 

[Alchemis]

hmmm what i heard about back firing is that when the main Cat is not there, back firing is very easy...

i've even tried before when i drag from 7K rpm down to 2K rpm...
the ass of my car is like ... very loud... bang... bang.. bang.. bang...

instead of those RB26 boom boom boom booom...

 

[- D i a b l o -]

allaa semangat what

bang *rb going* bang *down hard* bang bang *hidup rotary*

but no one answer me question yet here,any good answers?

 

[- D i a b l o -]

for all i know, higher octane gas will create more backfiring for our type of engine, RE. it can be annoying at times. and some has said that it doesn't really increase hp. so why go for it. FC engine was made at that era where 87 octane was the highest. so if we use anything higher than that, we're fine. RON100 burns better but too much backfiring for street driving.
correct me if i'm wrong.

ah sorry didnt see this lolz..hmm
weird then in races,what fuel those RX's using?
eg - Mazda 787B..hehehehehe

 

[saru-kun]

Octane rating of gasoline don't increase power.

http://www.answers.com/topic/petrol
http://en.wikipedia.org/wiki/Gasoline

The amount of power that can be produced from a fixed amount of fuel depends on the energy content inherent in the fuel itself and the efficiency of the engine that is running the said fuel.

Remember that lil' science experiment back in sec school where you play with this setup:
- a small jar of fuel is setup to heat a fixed volume of distilled water to its boiling point. The weight of the fuel before and after burning is recorded and the data is run through the formula Q = mco, where m is the differece in the mass of fuel before and after experiment, c being the specific heat capacity of water (4200 J kg-1 degC-1) and o, being the temperature change of water (boiling point - room temperature).

Your result would be in the unit Joules.

Pardon me for the chem tutorial. Just what I know ^^

Lets hope I don't get shot down in all flaming glory.

Cheers

Edit: a fuel with higher octane rating allows higher compression to be achieved without predetonation (?), thus the extra power...

The question mark, I have heard that "predetonation", "ping", "knock" and "preignition" are different...or am I wrong?

 

[phat7]

just chuck in 200ml for 1 full tank and you should be ok. for days where you know your car is going to see high temps and high speeds, adding some oil is definitely good.

 

[- D i a b l o -]

ah settles it .thanks

now 2nd q,that RON100..issit true aspec?
then what fuel they use for racing?

 

[- D i a b l o -]

Octane rating of gasoline don't increase power.

http://www.answers.com/topic/petrol
http://en.wikipedia.org/wiki/Gasoline

The amount of power that can be produced from a fixed amount of fuel depends on the energy content inherent in the fuel itself and the efficiency of the engine that is running the said fuel.

Remember that lil' science experiment back in sec school where you play with this setup:
- a small jar of fuel is setup to heat a fixed volume of distilled water to its boiling point. The weight of the fuel before and after burning is recorded and the data is run through the formula Q = mco, where m is the differece in the mass of fuel before and after experiment, c being the specific heat capacity of water (4200 J kg-1 degC-1) and o, being the temperature change of water (boiling point - room temperature).

Your result would be in the unit Joules.

Pardon me for the chem tutorial. Just what I know ^^

Lets hope I don't get shot down in all flaming glory.

Cheers

Edit: a fuel with higher octane rating allows higher compression to be achieved without predetonation (?), thus the extra power...

The question mark, I have heard that "predetonation", "ping", "knock" and "preignition" are different...or am I wrong?

I dont know what predetonation are,but ping and knock is the same thing isnt it?.
(Knock Sensor) .

Anyhow,thanks for explaining Alex.

So,higher octane reduce predetonation thus more power.Got it.

 

[Alchemis]

let's see what will happen to the engine if i put 2 bottles of octane booster into one tank of petrol :)

bwahahahahahahha anyone try that before ?

later 2 can ended up a rebuild.

 

[- D i a b l o -]

hehehehe,go la try try
i also try la one day.

 

[aspec_fc]

what i know for sure is that octane rating is more like anti-knock rating. knocking is a problem face by many turbo cars and the higher the octane is; the more resistance it has for knocking. NA has no problem with this at all. therefore, whatever the owner's manual states, that's the octane i'm going with which is 87. but i get 92 in malaysia. you will use higher octane gas when u find the engine having knock. else there shouldn't be any difference between lower and higher octane. race fuel have different compound of course in higher octane.
the last time i read about this, if u use a higher octane fuel, u need to advance your timing to get the power out of it. else, it doesn't help at all.

edit: WARNING: mess with your timing at your own risk.

 

[- D i a b l o -]

really? hmm.. interesting.

 

[aspec_fc]

ah sorry didnt see this lolz..hmm
weird then in races,what fuel those RX's using?
eg - Mazda 787B..hehehehehe

if i'm not wrong. the 4rotor was going at 86 octane. :shades_smile:

 

[- D i a b l o -]

but that aint racegas..86 octane je? thats leaded petrol right?

 

[aspec_fc]

race gas comes in leaded and unleaded. i don't know the details for sure but if the 26B is without turbo then it make sense why the engine is not in need for high octane gas. honestly, i still don't think there is any difference in terms of hp between the lower and higher octane gas.