bob13bt

iTrader: (9)

I have an '87 TII. Its all stock with an open exhaust and a FCD. I don't want to blow the motor (105K) but I don't want to be too easy on it and build up excess carbon. The engine runs excellent, but has low compression. I am currently saving up for a J-spec and fuel mods. So how often should it be redlined? Once a week? Twice? What do you guys think?

amemiya

I like to do it each time before I shift.

bob13bt

iTrader: (9)

Yeah, well, its just that I don't want to pop this sucker just yet. My wastegate isn't ported, and its all stock besides gutted cats. The poor thing had a shitload of carbon in the ports of the intake manifold. The throttle body wasn't too bad. So I know there is a lot of carbon built up on the rotors and in the seal grooves. I plan to ATF it soon. More replies!!!

rxseven

If you have low compression don't redline it. It's a bit of a myth that redlining the motor burns all the carbon and is good for the motor. A spirited long drive is adequate.

amemiya

aqua mister cleans the motor out realy well. and keeps the air cooler and increases HP. it good stuff give it a try.

ponykiller

What is, and where do you get, aqua mister. Is it through an injection system, or just a one time treatment?

thanks,
Kris

Cory Simpson

Yeah I want to know were you get aqua mist to

RylAssassin

I never understood how redlining a car could be good for it since when your redlining the engine is turning at 7k or more i mean this is stress on the engine any way you look at it, but hey they are FC's i guess right? I redline everyonce in a while not too often. The maintence is what will save your car do very frequent oil changes, maybe change to premix. IS there any way to prove that redlining is good for our cars??

ajsuper7

redline once a day keeps the mechanic away...thats my belief anyways

Mark'sMazda

To get the carbon out, I took off my air filter, and with the car running, gave it a few 5 second shots of carb cleaner. You have to hold the RPMs at around 3k or the car will stall. I was amazed at how much smoother the car ran after word.

Try at your own risk, it worked worked great for me.

White_FC

Damm I feel like I abuse my car compared to what some of you dudes are talking, mine cops about 10 redlines a day. However, im not doing it to get the carbon out though

skyypilot

I take my car to redline at least once every time I drive it. Why do you think the redline is there? So you can look at the pretty red color? And as for the carb cleaner thing, straight water is the best thing to clean carbon out of any engine. A mist spray in the TB while holding the RPMS up works very well. Try it at your own risk, but I have seen the results in a piston engine so I know it works there............

Wankel7

Find the Aquamist system by searching the internet. They are an australian company.

James

rotary>piston

spraying directly into the TB is kinda hard without a MAP sensor. The engine won't run if you disconnect the MAF.

Crionics

It's njot a bad idea to redline once in a while since there are so many features that actuate above certain rpm's such as vdi, aux ports, secondary fuel injectors and such. It helps to keep things from getting gummed up or stuck. I redline about every start, but I have never been known to be nice on cars - but I keep maintenence up at least

rotary>piston

all of that strain is part of why the carbon is freed. If there's that much strain on the internals, then there is equivalent strain on the carbon.
I rarely redline, like once every two weeks, if even that. Mostly I drive easy, and occasionally take it to 5.5k.

allenbillings

In the old days, I had an RX4 that shook its rear stationary gear loose. I had a friend that was a Mazda service manager and he got the engine replaced for me under warranty. This guy knew everything. He told me that the red line on the tach was pretty much put there for the flywheel and trans. He took my engine clear off of the scale just to show me. Best rotary I ever had. He also told me that frequent oil changes were the ultimate answer to longevity.
He also showed me a neat trick for reviving a dead rotor. He had a customer's car that had a dead rear rotor. To say the least, the car had not been well maintained. Before pulling the motor, he started the engine and poured pure ethylene glycol down the secondaries (slowly with the engine running about 3500 RPM). It, of course, started putting out clouds of white smoke, but after three tries the rear rotor started firing and the engine idled well. He said that the ethylene glycol was the best way to remove carbon from the seal springs. I saw it work and couldn't believe it!
Just as a reminder......The old Rotaries used straight ethylene glycol injection so that the damned engines would turn over in cold climates. There was a tank and everything from the factory.
I use ethylene glycol every once in a while to clear out my engine. It has some lubricating value (unlike pure water) and does a good job of keeping the combustion chambers clean. The wife's '91 NA (stick) idles smoothly at 650 and it's got 94,000 miles on it. I've never read anything about this, but it works well for me. The wife always shifts at about 4K and I rarely drive the car.

zachman

will redlining really help and how long should i redline.

nillahcaz

iTrader: (2)

if you fell the need to ask this is the wrong car for you j/k there is no NEED to go past 5500 rpm to keep stuff working, but the way i see it. why bother doing extra to keep stuff working if you don't drive in a way that needs it? if your want to get rid of carbon put some Marvel oil in your tank.

GTIguy

Just a thought... does ethylene glycol work like Automatic transmission fluid treatment? If not what are the differences and where can ethylene glycol be purchased? Interesting topic BTW

Amur_

Uh, wait a minute. Are we talking ethylene glycol as in the main ingredient in anti-freeze?

If so, that stuff dissolves rubber. Want an example of how fast? Next time you do a coolant change/flush, pour a little blurp of it on the ground and step in it (assuming you're wearing running shoes.) Now put that foot on dry pavement or cement and push it away from you. It slid like you put it on ice, didn't it? That's how quickly it attacks the rubber.

I'm not challenging that it works for you. I've taken enough crap myself over supporting other 'controversial' maintenance techniques. I want to point out that IF we're talking about the same thing (ethylene glycol/antifreeze) then those who do this are pouring a potentially damaging liquid into their motors. The apex seals and rotors aren't rubber, but the oil side seals are. I don't know enough about how things work in there to speculate on whether or not the ethylene glycol would reach them. I'd guess not from reading about the longevity of your motors, but the whole thing still makes me wonder...

wankel drwankel

coolant disolves rubber????? what about all the rubber hoses seals and o rings that are in every coolant system since the begining of time. coolant does not disolve rubber any more than oil. the whole slipery shoe thing would be the same with oil also, but because of the lubracating properties not because your shoe is melting.

adidashatesnike

iTrader: (1)

Yea do you guys seriously only take your cars to redline once or twice a week? Because whast the fun in that? We have these extremely high reving cars that well atleast for me dont get real power till I hit about 5k and the engines well there not gonna last long and the longer you make them last by not driving them spirited the less fun you have and to me its not worth that just so I can keep the same engine for a few years more. Dont get me wrong I change the oil every 1500 miles and I constantly check over the car but I also except the fact that even tho I just dropped a new streetported engine in it I will have to replace it within a few years. Well just my thoughts on the matter.

Amur_

Another story about coolant.

The company that I work for has a shop to maintain their heavy equipment in. It's a family-run business and they try to service everything themselves.
Short version - one day the son was topping up the windshield washer fluid in all of the dump trucks. Well, sometime earlier he had used an empty WWF container to store coolant. He used this same container to top-up all the WWF reservoirs.
The next day it rains. Everyone drives out to the job site and then spends the next hour trying to scrape the remains of the wipers off of their windshields because the coolant ate the wiper blades, leaving one hell of a mess.

Also, last fall scathcart was looking for recommendations for goo to put on his tires to get the most smoke out them. Guess who recommended coolant? He later reported back that it was the coolant that produced the best results.

https://www.rx7club.com/forum/showth...hreadid=121008

Coolant is a lubricant? That's new (to me.)

As for corroding the innards of the cooling sys, the components are designed to carry coolant. Just like you wouldn't use ordinary rubber hose to carry gasoline, so too would you use a particular hose type, etc to carry coolant.
I don't know whether or not the oil rings would tolerate exposure to coolant (if they even would come into contact with coolant doing the suggested cleaning...?)

GTIguy

Coolant is not acid, it will not eat through your shoe that quickly. If you got some bleach on the other hand it might do something of that sort. Coolant does have chemicals that probably will break down rubber but not in that short period of time. The rubber on your shoes is not that much softer than the hoses used in your car.