Holset Oil Drain - The Right Way in HD
Watch It In HD!!!
This is my first HD video. I hope that you enjoy it.
Since I built the car, I was told to watch the drain since I used a rubber
hose. I normally check the car weekly if not more often and on this
particular day I found that my drain was a bit larger than usual.
When I started the build, I knew that I was going to run a Holset turbo. The company has release all the info on
oiling requirements, so I decided to use them. They called for a drain that
was no smaller than 19mm which is bigger than -10AN yet smaller than -12AN.
To ensure that I had the minimum size covered, I went with a -12AN drain.
This is not easy and no one currently sales a bolt-on -12AN drain. One
reason is that the return hole in the oil pan is too small and must be
enlarged to have a true -12AN drain. It would be senseless to install all
those expensive fittings and have it bottle neck at the oil pan. This just
takes a little effort and thought.
I had a -12an bung welded into the oil pan. I then purchased an adapter
that would bolt to the bottom of the Holset with 3/4in NPT threads. I then
used a 3/4in NPT to - 12AN adapter off of the CHRA. The front motor mount
also has to be slightly altered to allow clearance of the drain (You can
see this when I am installing the new fittings). All of this was done
during the build, so I do not have footage of it but it is all easily seen
in the video.
When I first tried to assemble the drain, I was trying to use a different
style of fitting with stainless steel hose and they were entirely too
large. They would not line up without hitting each other and there was no
way to trim them. This was the only thing stopping me from starting the car
so I went to the local auto parts store and found a hose that would fit. IF
YOU ARE IN THIS SITUATION BUY THE RIGHT FITTINGS TO AVOID THE DISASTER I
ALMOST RAN INTO. This hose only had 1900 miles on it when this occurred. On
the bright side you have a video to shed some light on the problem.
I ordered my fittings from a company called Race Parts Solutions. They were
very helpful with the return issue and their customer service was great.
The rest of the fit and modification can be seen in the video. I cannot say
that the same fittings will work for your application because the manifold,
turbine housing, and where you weld your oil pan bung play a large role in
where your drain will need to be.
I choose to use a fiber braided push lock hose instead of just the flexible
push lock hose. I went this route because the oil drain is exposed to the
roadway and the fiber braided hose is better protected against debris. I
also used boot band clamps to secure the hose but they make clamps
specifically for that.
All in all it is not a hard job; it just takes a little time, thought, and
ingenuity. If you find a set of fittings that work for you, please let us
know what they are and your setup in the comments. I hope that this helped
you get Boosting and I really hope
that you enjoyed the HD footage.
Below are the links to the CHRA adapter that fits the Holset and the
website I purchased my fittings from.
Last adapter on this page : https://turbodaves.com/Flanges_Accessories.html
Just one source where you can find AN fittings :
Worlds Fastest Toyota Auto Supra / 1320 Motorsports / Real Street Performance / BoostLogic
Coverage from Import FaceOff on April 21st 2013 in Columbus, OH at National
New Record for Factory Automatic Supra, 8.81@151mph, on BoostLogic Built Toyota Transmission! NO Nitrous, NO TRANSBRAKE, 1.33 60ft!
Justice Racing Engines built 3.0L 2jz bottom end with parts from Real
Street Performance and Gates Racing, OEM parts provided by Elmhurst Toyota,
custom Wiseco pistons
Fuel system using Fuel Injector Clinic 2150cc injectors and Goodridge
teflon hoses and fittings
Headgames Head with Kelford Cams T202D camshafts and Ferrea valvetrain
BoostLogic Built Toyota Trans
FTI Converters custom spec torque converter
Precision turbo 7275 turbo (72mm)
HFR Fabrication custom built roll cage
Mickey Thompson 28x10.5x15 ET Drags
Additional parts from Freed Engineering
Vehicle wrap by Wrap King // A1A SignWave