I am almost posotive my feed is -4an but the drain could either be -8 or -10. How can I tell?

 

AN is sized by the outer diameter of a metal tube. Theoretically a -8 is 1/2" and -10 is 5/8". With braided hose, its a little tougher. Best way is probably to measure the threads on the fitting. -8 is 3/4, -10 is 7/8"

 

So does 1/2" <U>NPT</U> mean the same thing as -8an?

 

no it doesnt. 2 different standards of measurment.
NPT = national pipe thread
AN = Army Navy

 

Ok so if I were to get the function 7 1/2" NPT drain flange i would need the earls 1/2npt ---&gt; -8an fitting. What fitting will I need to feed my turbo oil? I have straights but they are restrictors that were used on my 35r, I've since switched to journal bearing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boilermaker1 &raquo;</TD></TR><TR><TD CLASS="quote">AN is sized by the outer diameter of a metal tube. Theoretically a -8 is 1/2" and -10 is 5/8". With braided hose, its a little tougher. Best way is probably to measure the threads on the fitting. -8 is 3/4, -10 is 7/8"</TD></TR></TABLE>


Braided -10 has an INSIDE diameter of 5/8.

 

well I know my drain is -8 now but what is the inlet thread size on the turbo? Is is 1/8 or 1/4 npt?

 

usually they are 1/8 npt...

Usually the bearing case (not always) is threaded for 1/8"NPT. Put a 1/8"NPT x -3AN and you should be good to go. There is no reason to run a -4 line and your drain sounds a little small... -10 or -12, or 1/2 is perfect. (-10 for the BB turbochargers)

 

My feed is -4 while my drain is -8 on GT40. Anyone see any problems with this, please speak up


Modified by LSEGHATCH at 5:01 PM 9/18/2007

 

http://www.holley.com/index.asp?division=Earls

they should have a diagram of AN sizes etc that you can hold up to gauge it.