vacuum hose or copper tubing?

[Dennis Detweiler]

 On my 39 Plymouth there is currently copper tubing from the carb to the vacuum advance in an ugly "bent up" configuration. Is it ok to switch to rubber vacuum tubing?

[desoto1939]

The original would have been the metal line and the reason for the bends and or curvature is for engine movement and twisting. The line can flex since there is a curve to the metal line. If it was rigid then it would bend and then break and then cause a vacuum leak.

Also with a rubber hose the hose would be  crossing over the head and also the manifold and there would be a good posibility of the hose getting hot and burning a hole inthe hose.

 

Get the new nicad metal lines and bend a new line with the fittings.

 

Rich Hartung

desoto1939@aol.com

[Don Coatney]

Use of a short rubber hose allows flexibility required to adjust the timing. 

 

 

[Hickory]

I like how that looks don, do you have a larger pic. Did you run around the front of the head or still went over it

[Don Coatney]

2 hours ago, Hickory said:

I like how that looks don, do you have a larger pic. Did you run around the front of the head or still went over it

 

 

 

 

 

[TodFitch]

In general mild steel tubing would be better than copper as copper work hardens with vibration and may fail quicker. The setup Don shows seems like a good solution, steel tubing most of the way, especially around the hot parts of the engine, and then rubber to allow flex near the distributor.

[Dennis Detweiler]

I like Don's idea. I'll go that way.

[thebeebe5]

Recently did mine in 3/16” NiCop brake line. Ran it around the back of the head and left some slack for timing adjustments. It will be anchored to the block in front of the temp gauge bulb with an edel clip.