I have read confusing info on the Internet as to the function of the coolant lines that run from/through the EA81/82 intake manifold. Some statements say the lines are to cool the intake from engine heat, others say they are to warm the intake (for emmissions?).

 

What is the general consensus of those on this Board with knowledge of these engines?

 

Have been thinking of capping those small water lines. I imagine that the volume of flow thru those small lines has nothing to do with moving coolant from one head to the other (aren't the internal passages for that?). If they are to heat the intake then capping them should make the incoming air cooler. If they are to cool the intake, how effective can they be?

 

I have already changed my thermo from 195 to 180 to lower temps and removed the splash shield from in front of the disty to increase air flow around the carb so that there isn't a dead spot where higher air temps could be trapped.

 

So what do you all think?

 

Aldoat

Thanks Tim but that doesn't answer whether it heats or cools? Would that air bleed still work if you just ran a hose direct from the pipe nipple/thermo switch to the thermo housing nipple without connecting the carb mounting flange nipples? Or am I missing something here (like maybe a screw in my brain pan)?

which lines are you talking about?

The little 3/16 or 1/4 inch coolant lines that run under the carb from the heaterhose/waterpump pipe to the carb mount and then from the carb mount to thermostat housing end.

on mine with the weber set-up, I have the one on the passenger side hooked up, but have the other side blocked off I think.