So I bought a used jdm s7 engine with low mileage and good compression but once i started it it start blowing out white/grey smokes. I immediately assume the water seal is bad. I decided to pull it out and rebuild it the engine internal looks good it has no rust. It does have carbon build up more on one of the rotor vs the other. I replaced all of the o rings and seals with RA stuff. I also reused the oil control rings casing i just replace the o rings with viton (I did not install it backward). The engine makes 90- 100 psi but it still smokes!!!! I let it idle for an hour no bubbles in the coolant, it doesnt smell sweet, i also bypass the turbo oil feed so it cant be the turbo. It gets worst if i rev the engine. Im using the factory omp with Pennzoil premix half of a quart to 10 gallons. This is my first rotary I have own this car for about 1.5 months so im really new but I hate car that smokes! ANY IDEAL WILL GREATLY HELP!

 

That's a lot of premix. But more then likely not your problem. You my have bad oil control rings or maybe pitched a insert during installation. Also I know you say that that you installed the oil control rings facing the right ways but the most common mistake is that people install the oil control ring springs backwards. What was all replaced during your rebuild?

 

I replaced all the o ring with ra o ring kit. Side seals corner seals and oil control ring casing I reused. Ra classic apex seals and spring is new. I also shimmed the front cover relief valve so I'm getting 60 psi at 1500 Rpm will this put more pressure on the omp and makes it spray more oil? I really don't think it's oil that I'm burning the smoke is more of a grey then it is blue.

 

You premixed heavy AND have the omp hooked up AND just rebuilt it, how long did you run it? Long enough to burn off all the assembly lube? That stuff can take a bit to burn off

 

Is that really heavy? 16 once is half of a quart and I have about 10-11 gallons in the tank at the time. Plus the omp... I guess it is on the heavy size but will the premix produce white smoke ? The exhaust smell like straight up raw fuel. I haven't registered the car so I can't drive it yet but I let it idle for 2.5 hours so far

 

Usually you premix 1/2 oz per gallon of gas if you remove the OMP, so yes, you have it heavy, BUT in the long run it helps with engine break in and building compression to help it start, but the drawback is it will take longer to break in

If your not losing coolant or oil, i wouldn't worry about the smoke until you actually drive it and get it hotter

 

Well i only had it idling for about 2.5 hours or so havnt driven it yet. So I hope it will clear up once I put some heat in it.

 

Idleing it that long it good, helps start everything to seat in before its put under stress, just make sure you have everything buttoned up before you go on the first drive

 

Yes the car is getting 60 psi at 1500 rpm because I shimmed the front relief. Everything looks fine no leak at all. I'll take her for a drive Monday and I'll report back.

 

Why did you shim the front relief ??did you modify the oil pressure regulator???? And like iduley said that's alot of premix I normally run .5oz/gal with the omp attached and 1oz/gal-1.25/gal without . Do you have any contamination in the exhaust?? You may just be burning off what ever got in there.

 

It might be because of the amount of premix your using maybe? Or you might have used a lot of Vaseline and oil when assembling the engine?

 

So I just noticed some coolant lost about 8 onces or so for a period of 12 hours the car is not running. I have to look around to see if I have a leak some where nothing looks obvious so far. Please don't let it be the water seal again I'm going to burn the thing to the ground lol

 

drop the exhaust and run it, i semi recall you already having a thread about a smoking engine which means your exhaust may be coated with oil from the previous issue. not a fan of RA coolant seals either, poor design.

 

Yea good suggestion! I'll drop the exhaust and see if it still smoke. While at it I'll drain the fuel tank too. But i still can't find where the coolant disappearing to tho. It missing about 7-10 onces (guessing) in a 12-14 hours period just sitting there engine not running. But I have to say you rotary owner are very helpful the best yet by far!

 

Check your oil.. Your missing about 10oz and you say theirs no spill on the floor and no obvious sweet smell it might be seeping into the oil pan.

 

Could be air entrapment. Use a Lisle funnel and make sure it's burped real good

 

Agreed. If it's not in your overflow tank my guess would be air in the system. Lisle funnels really help burp the system. Also, check both coolant caps (pressurized and non pressurized fill) to make sure they are fresh and the rubber seals well. This time of year with colder temps, caps with older compressed rubber seals tend to not seal as well. I replace mine on an annual basis just to make sure that I have great sealing.

 

I did used the funnel and burp the system really well. I'm sure there isn't any air bubbles in the system I even Jack the front up. I did not put the cap on the filler neck just left it open. I don't think it would evaporate that quick! This is the third time I fill it up and it leaks the same amount eveytime. I work a 12 hours shift so every time I come home from work I look at it.

 

Next time you get home and see it low on freeze turn the motor over by hand a few times and take the plugs out and see if they are wet

 

Have you checked your overflow to make sure it's not filling up?

 

pinch a seal?

 

If your metal oil control rings were worn beyond spec that'll cause the issue you're seeing.

Stock ported engine?