Re: Replacement Heat Riser Springs

The "springs" are not plain spring steel; they are bi-metallic. They are made of strips of two different metals pressed together. The two metals have different coefficients of thermal expansion (CTE), so that when the temperature increases the spring tries to coil or uncoil. To make one, you'd need a bimetallic material and you'd need to know which side expands more and wind it in the right direction (otherwise it would try to close the butterfly as it heats up instead of opening it). In my opinion, it's worth $40 to not have to figure all that out again. You're talking about the price of a tank of gas.

Dave Casey

PS - bi-metallic strips are also used for the choke rod on the intake manifold, the electric gauges in your instrument cluster, the voltage limiter for your cluster, and the original "mechanical" voltage regulator.

On Tue, Sep 19, 2017 at 7:41 PM, ddavids <ddavids@xxxxxxxxxx> wrote:

Does anyone know a source for heat riser springs?
Specifically, the spiral wound ones on most sixties Mopars.

There's a fellow on eBay who sells a repro spring (original p/n 2843685) which he says is for hemi exhaust manifolds.
He wants $39.95 plus shipping. Wouldn't this be the same p/n for A, LA, B, RB engines?

Absent a cheaper source, couldn't one wind their own spring? My calipers say the springs are 1/4 inch wide and .020 thick.
What sort of spring steel were these made of?

My immediate application is the exhaust manifold on a 1964-5 Dodge 273 V8.

Dan Davids
Seattle

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