Double_J

iTrader: (28)

I know rx7's burn a bit of oil. I also read that its inportant that the oil lubrucates the apex seal. I also read some people mix gas and oil to give further protection.

So here are my questions...

Can the amount of oil be controlled? If so is that a feature in the pfc?
How much oil is normal or healthy for an FD to consume? 1 litre per 1000km? 1L per 5000km?

'80 GS OO

On my 1980 12A, the amount of oil injected into the engine is controlled by a fairly simple mechanism. The position of the throttle pulls a metal arm to increase the flow of oil into the carburetor from the metering oil pump.

Run the engine at 2000 rpm's for 6 minutes and check the amount of oil discharged into a graduated container. The amount of oil discharged should between 2.0 and 2.5 cc.

To adjust the volume of oil from the metering oil pump, you can add or subtract a washer and move the cotter pin up or down on the linkage as needed.

Your FD may have different specs.

dj55b

iTrader: (2)

it will vary depending on driving style mostly. the amount injected increases as rpm increases. So if you're normally driving your car (~3krpm) as oppose to always pushing it (~7krpm) you might see very low consumption.

thewird

iTrader: (8)

There is a setting in the powerfc that controls the oil metering pumps voltage correction. As the water temps go up, the voltage is increased. I increase this setting by a tad for the higher temperatures in all the cars I tune.

I burn close to 1 liter of oil per full track day (ex. Mosport 30 minutes x 7 sessions) as I'm in the "hot zone" and high RPM much longer. That includes the drive there and back and some testing I usually do the day before.

I change my oil less often then people would expect as I'm constantly adding fresh oil into the pan. I only change my filter occasionally.

thewird

Double_J

iTrader: (28)

Thanks for clarifying guys. Have come from a piston world usually burning oil is a bad thing. Then when I read "oil metering and lubricate the apex seal" I was a little confused.

Obviously the amount of oil burned is minimal at any given time but is it possible that the oil is PARTLY responsible for the smell in the exhaust or why these cars can have a harder time passing E tests? Like I said I know its a small amount of oil but these tests read in the parts per million, and that is a pretty small value.

rx7racerca

iTrader: (1)

It's a given that the metered oil is part of why these cars have problems with e-tests, and why the exhaust smells - combined with how rich they are tuned stock and on most turbos with standalones. When I start my cat-free 7 on a cool morning, the exhaust is literally a mist of fine oil and gas - if I don't back it out of the garage quickly, and drive away, the garage will smell of oil and gas all day - as will my clothes, if I get out of the car while it's still idling cold in the garage. With working cats, the cars should pass e-tests, but will still be "smoky" off a cold start until the cat(s) warm enough to do their job.