I cannot figure out the thread for the oil feed on the top of the turbo.

Anyone?

I thought I had it figured out but as soon as it got hot it leaked.


Thanks in advance.

 

i think its 1/8 npt...but thats a I THINK. I cant remember, its been awhile

 

Its not a 1/8 or 1/4 NPT we came up with what we thought was a -3 fitting but that is not right either.

 

Call rx7store and call them then

 

I am on the phone with them now. They are saying -4 and that is what I thought ( I was incorrect with the -3 above I meant -4) but we are getting leaking around a -4 when heat is in the turbo.

Puls when you look at the threads on the fitting they are pulled like they are not matching up correctly, not crossthreading, more like they fitting is too small.

 

Have you tried putting some teflon tape on it then installing it on the turbo... should help with that leak. Maybe try some loctite if you plan on never removing the fitting.

 

If it is the aluminum restrictor fitting they can pull the threads, I noticed they don't fit well consistently, if it is a brass fitting your having another issue. It should be -4 I also wouldn't run the .035 I would look at a .065 or .070

 

OK I have the solution and thought I would pass it on in case someone else has this problem.

It was the bottom of the fitting, we were using a -4 adapter with a inverted flange, we needed a brake line inverted fitting for it to seal up correctly.

A little run to Napa and then some modifications on a lathe and I have a good tight fit with no leaks at all.

The guys as Cheap Turbo (phoenix turbo) were a huge help. They also said I should have had an o-ring in there and there was not. Those 2 things together sealed her up perfectly.

 

Not sure why you were having issues. We have used the same line and fitting many times with no problems. You dont need an O ring.

 

The o-ring is admittedly overkill, but, so is everything else on the car.


Its not the thread of the fitting it was the angle of the inverted flange. We were using a AN inverted flange (read Aircraft which is at a 45° angle) and we needed an Automotive inverted flange 37° degree angle. We were not getting a good seat.

Once we purchased a Automotive (brake system) inverted flange and machined it to adapt to our line we had no more leaks. The leak was substantial, enough that the car could not be run and this being the 1st startup on the new engine I was a bit of a spaz trying to get this sorted out ASAFP.