I see these on Oil coolers and Fuel lines as well as braided hoses......what do these connectors look like are they screw on's?

 

AN is a standard of measurement. the dash number is the size of the fitting and the number before the dash tells you what the part is, weather it is a union or an elbow ect. Most of the fittings you will find in fuel, oil and hydraulic systems use this system of measurement. yes the are threaded

 

and the AN stands for Army-Navy

 

-3 and -4 lines are usually used for oil lines....
they are small
the -8 are quite bigger...

 

The -4, -6 line or whatever is the numerator in a fraction over 16. So a -4 line size is 4/16= .25" in size and the -8 is 8/16= .5" etc.

 

Thnx guys, going to get silly and over cool the fuids in the car.....oil cooler, tranny cooler, and what do you guys think about a Fuel cooler....? After all it is only 30 bucks.....then I would have to hose it up......is it logical in any way to install a fuel cooler? Future plans for the Chasis is a Non VTEC Turbo....

Building the D16 isn't worth it.

 

Fuel cooler only needed on old V8's with mechanical fuel pumps.
They tend to vapor lock rather easy.

 

kewl....thanx

 

That helps a whole hell of alot....Now, what about -4 NPT. WTF does NPT mean?

 

National pipe thread. Comes in 1/8 inch, 1/4 inch, 3/8 inch etc. etc.It's a tapered fit thread. No o-rings or bevels necessary.

 

Wow! I always thought the AN stood for American National (pipe thread that is).

Learn something new every day.