I'm going to take the intake manifold off my son's 81 242T and replace the vacuum lines that hide under there. I plan to use silicone lines because I've been told they take the heat well and last. Does anyone know what size line is best for the stuff under the manifold??
--
Thanks everyone for all the help, Doug C. 81 242 Brick Off Blocks, turbo bars and wheels, M46; 86 244, B230, 150k , auto.

The common vacuum size is 4.2mm. There's reference in the FAQ to 134" needed for the entire engine (B230FT) of 4.2mm; 26" of 6.6mm (this runs from the intake manifold to the fuel carbon canister) and 12" of 3/8" hose for the brake booster. I believe there's also a short section of 3/8" for the check valve which connects at the top of intake manifold.

You can check the vacuum hoses on your car to confirm. Following the part number, there should be a diameter symbol (0 with a diagonal line through it) followed by 4.2 (for example, for 4.2mm).

--
dnvolvo '89 765T 200K - '91 245 100K

ipd sells 2 different sizes, and iirc, thats all you'll find, minus the brakebooster hose. it is metric though.

check it out,

http://ipdusa.com/ProductsCat.aspx?CategoryID=1422&NodeID=4532&RootID=629

smith