I bought a gt35r kit for my 93 fd since i believed my twins were bad (again) and i am almost finished with the single turbo install. The problem is that after I started it, i'm still getting blue smoke out of the tail pipe. And i think its worse! billows of blue smoke The engine is rebuilt (14k mi on rebuilt) and have all the necessary fuel mods. At first I thought it was the inadequate crankcase ventilation, but after i opened the oil cap, it still smoked. The kit came with an oil restrictor, which is installed. After i ran it for a few minutes, i looked at the turbo and the where the dp connects to the turbo i saw some evidence of fresh oil leaking! I went under the car and there was also some evidence of oil leaking from the turbine side of the turbo. There is no evidence of leakage from the oil feed line. Now the only thing I suspect is that the oil drain hose was kinked far enough for no oil to pass through, thus building pressure in the turbo and blowing through the exhaust side of the turbo. But when I removed the oil drain hose and bent (almost 90 degrees) like it was installed...it seemed like oil could still pass through the hose. I did cut the flange on the motor side and just slid the hose over it with a clamp.

I'm going to install a silicone hi temp heater hose (temporary) that is more flexible and less prone to kinking to see if that will fix the problem. But could this be the problem to my billows of blue smoke? Also, is the oil drain clocked in position correctly?

 

ahh...sorry for the huge pic files

 

chra orientation would not cause that. Return line doesn't look like it would be enough to cause that. Hard to say really, too bad you don't have enough turbo to just swap on and try...

 

OK first replace or remove your lines, you will burn through that drain you will also burn through the coolant line lying on top the T/H. CHRA position doesn't look too bad it should be within 15* of vertical. However my guess is you haven't put any boost through this turbo yet. Read the sticky up top( https://www.rx7club.com/single-turbo-rx-7s-23/turbocharger-oil-seal-leakage-explained-727476/ ) about oil seals on these turbo's when new at times the seals haven't set yet. You need to put some positive pressure through there. Get the seals to set. Also if you had a very bad smoking issue before it may still smoke for awhile depending on how much oil was actually put into the exhaust system it may take some time to burn it off out of the actual exhaust, especially if you have a cat of some type on there. Go through all that then see where you're at.

 

it could also be the oil seals in the engine. i know its a newer motor, but crazier things have happend. also the fact that it did it before and after...

 

Is the motor ported? If so, who was it ported by? I bought a ported motor for my buddies FC and it smoked the same way, turned out to not be the turbo, but the ports were into the oil passages in the motor causing it to smoke.

 

ok, i'll try this tonight or tomorrow and see how that works...thanks. But I just pulled the spark plugs right now and found some oil residue.

 

The motor is not ported. It has stock ports.

since i've seen that there is oil on the spark plugs its getting really close for it to be the motor instead of the turbo. But how can this be if the motor was rebuilt just a while ago? Hmm..or could the oil in the plugs be normal? I'll post pics of the plugs in a little bit.

 

Sooo....i'm assuming this much oil is bad in the spark plugs? Damn, this is getting close for the problem being the engine...which i hope its not since it was just rebuilt a while ago. But if its....then i guess it was a bad rebuild. anyway, here are the pics of the plugs...bad rebuild? or is this normal?

 

wow that looks way worst then mine and mine had a bit of burnt oil on the tip also.. do you have the OMP still? runnign premix? i think my omp sometimes malfunction so that is why i have oil, i would check yours if you do still have it.

 

no, i'm not running premix. I'm still working with the OMP. But could a bad OMP be a cause of this? Its a crap load of smoke...i mean it fills my neighborhood block with smoke!

 

Whoa, plugs look nasty....and worn.

I'd be looking at the side plates/oil control rings and seals. Its quite possible the rebuild used irons with border line wear and or used control rings with border line wear and its now startign to blow out.

 

Thats my guess too. But don't over look a possible stuck OMP.

 

How would you check if its a stuck OMP?

 

Plugs definitely look bad. I would start looking at the other things motor related.

 

Jeeses how long have those plugs been in the engine? I have never seen souch fould out plugs before. Get som new stock plugs and put them in. And then start the car up. Rev it abit for a while and see if the smoke clears. It might be the OMP yes. What u could is disconnect it. And run without the OMP. On idle it's not a problem just to see if the oil goes away. Im guessing u got oil leakage from the stock twins and u still have alot of oil inside the combustion chamber that is not burnd up. Esp due to those realy fould out plugs. What kind of engine oil are u running?

JT

 

Hmm...i'll put in new plugs, disconnect the OMP and run it for a little bit and see if that clears the smoke.

 

Looks just like my problem. Any chance that the plugs could get fould badly like that and then not be able to burn the gas mixed with oil from the OMP (or premix in my case)?

 

Has anything more come of this? Mine still smokes

 

I sort of gave up since I couldn't figure it out and I started school last week. so I had no time to work on it. But Rick from Ricks Rotary Performance has it right now...he's gonna give me a second opinion. But when I talked to him, we both think it could be an internal motor problem (oil control rings). I'm really hoping it's not and maybe its the OMP...but then again, it shoots out waaaay too much smoke. He's gonna give me the diagnosis later on in the week...

 

Just curious but what did your oil pressure look like while it was running? Maybe you have a problem with oil pressure regulation?

 

I wasn't too sure because my stupid oil pressure gauge was fluctuating up and down like every other FD...lol. But I'm assuming it was normal because it would usually read normal when it did work

 

UPDATE 9/11/08: Rick from Ricks Rotary Performance did take it apart the engine over the weekend and found out the the oil seals from the sides of the rotor were black, shrunken and hardened!!! I went to go check it out and he showed me a used o-ring from a 30k mi motor and compared it to mine. WOW...what a difference! The other one looked like it was in healthy condition. It was a lot bigger, greenish and still very flexible.

Rick contacted one of his guys in Canada who also does a ton of rebuilding and asked about the rebuilt kit I used (RA Rotary Aviation) and he told me that they were also having problems with those same oil seals AND their apex seals. Wow...looks like I won't be buying the kit from RA anymore. But i'm still gonna try to contact them about the oil seals...hopefully they'll do something about it. I'll post pics when I get the car back.