Packard Forum Index » Post-War (1946-54)

I don't know about the Packard and can't really remeber exactly about others. But seems to me that the bottom hole in the manifold for the choke tubes is a slightly smaller diameter than the upper hole. So need to check that.

If I remember correctly (which is getting more doubtful as years go by) the bottom of the V8 tubes is actually pinched partially closed, perhaps (or not) part of the swedging process.

One other question about the extra sleeve for the thermo people. Will the extra mass slow down heat transfer to the choke tube enough that the choke would maybe not work well--too slow on opening because of delayed heat or not closing fast enough because of residual when engine turned off for a period. Don't know how much extra it would take to mess things up. Might be a consideration because of bulletins that sometimes recommended a change of a notch richer or leaner on choke for some reason or another.

Shouldn't reduce thermal transfer rates by much. Iron is a pretty good conductor. Maybe 10 seconds delay for a thick tube, I would think.

Thermal conductivity for iron is going to be around 9.3 x 10e6 per 1/16 of an inch per second. A joule will heat a gram of air 1? C.

I think.

Tom