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Old 04-26-2013, 05:10 AM
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Join Date: Feb 2007
Posts: 81
1971 250C Exhaust Dampers?

The above car runs well around town with its original twin zenith carbs, but boggs down at highway speed. Rather than mess with further carb adjustments, rebuilds, etc, I bit the bullet & bought JAM Engineering's Weber carb kit.

Upon removing the Zeniths, I noticed two "dampers" on each of the ports in the exhaust manifold. It appears the dampers are supposed to be opened by bi-metalic coils as the engine warms.

Both coils are broken & it appears the forward damper is seized in the open position, while the aft one moves freely & may have been open and/or closed as I drove.

Dos anyone have experience with these things & how they affect performance?

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1971 250C Exhaust Dampers?-exhaust-dampers.jpg  
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Old 04-26-2013, 08:03 AM
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Join Date: Jun 2005
Location: Chicagoland
Posts: 1,248
That's a common problem on these cars. Check out this link.

On mine, I ended up getting a piece of steel to close off the heat risers.
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Old 04-26-2013, 08:17 AM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 4,786
Alternatively, post #6.
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
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Old 04-26-2013, 09:40 AM
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Join Date: Feb 2007
Posts: 81

Thanks, fellas. I'll leave the forward heat riser sealed shut (San Francisco) & secure the aft in the same position.
Regards, C

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