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Looking over the spec. sheet from a corvette restoration establishment I had go though my car prior to having my 66 string ray restored, I noticed on the list of corrections he had written down that he had found the heat riser frozen. Would this lead to a overheating situation?
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Re: heat riser frozen
If it's stuck closed if will force all the exhaust gas from the right bank through the heat riser package in the inlet manifold to the left bank exhaust, which will cause fuel percolation and could damage the manifold and/or carburetor. It will also cause water vapor condensation in the RH muffler that will rot it out quickly and poor performance due to excessive exhaust back pressure.
The heat riser should be closed when cold, but open as exhaust gas heats the thermostatic spring.
It's best to wire it open if the car is not driven in very cold weather, and they can sometimes be unstuck with a penetrating spray. IIRC GM sells a product specifically for that task
Duke -
Re: heat riser frozen
Duke,
In this warm-up state (closed heat riser), what pecentage of exhaust gases are re-routed from the right bank to the left? If 100%, this would mean that the car is temporarily functioning as a single car exhaust...
Also in this warm-up state (closed heat riser), if there is condensation in both banks of the exhaust system, can we assume that the left side will appear to blow more white smoke out of the tail-pipe upon start-up?
Thanks.
LouisComment
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Re: heat riser frozen
When cold the heat riser is closed so all right bank exhaust crosses over to the left bank. Exhaust heat begins to open the valve soon after startup.
If you feel the exhaust immediately after startup there is no flow on the RH side, and you will only see condensed water vapor of the left.
DukeComment
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