Originally Posted by MILD THUNDER

I wasn't talking about the hot air for the choke. I was talking about the heat risers they used to put in the exhaust manifold. It was plumbed directly into the air cleaner assembly, and fed warm air back into the carburetor. Some actually had ''heat riser'' valves, that went between the exhaust manifold outlet, and the exhaust pipe. When the engine was cold, the valve would shut, forcing warm air from the exhaust into the air cleaner. Once the engine warmed up, valve opened, things went back to normal. The valves became problematic themselves, and most got welded open, or removed. They then went with just a tube that collected heat from the manifold, with a thermostatic flapper on the air cleaner. When the engine was cold, flapper door shut, focusing on sucking heat from the hot air tube, which mounted to the manifold.

High power airflow wasn't a concern. Because with the old quadrajets, when the choke was engaged(cold Engine), the secondaries would not open.

But thank you for attempting to correct me.

Originally Posted by tunertech

Not correcting just elobrating
+1 absolutely... good call

Originally Posted by ICDEDPPL

GM, Ford etc. They Run coolant thru the throttle body for idle quality when cold, that may tell ya something...

Originally Posted by ezstriper

I was running a prosystems blow thru carb built for my 509, did not idle bad at all most of the time....every now and then acted up...not sure what to blame that on...now I do run timing locked @ 28 and a digital 7 MSD ignition with start retard. I do run water thru mine all the time..but at idle flow is not much...am currently working on my own port EFI so let you know in the spring how that works out....

Originally Posted by keith2500hd

i used to work on large high speed diesels, we would run intercooler water full bore, run fast then return to idle. problem that occured, humid air on the water around boat running across intercooler would lead to water droplets bouncing in intake ports. these would lead to damaged valves and piston crown - thermal shock.