Exhaust manifold valve

**gunnie** · 05-26-2007, 02:51 AM

Hi guy's,

I drive a Riviera sedan super series 50,model 52 from 1951.
And have change the exhaust manifold on the car, because it was cracked, i had a spare.
But in the exhaust manifold you have a valve to control the heat below the carb, now that valve isn't working anymore, valve shaft is rusted and tried to set it free but its dead!!i have cut the valve with the shaft out of the manifold ( have seen that you can buy new manifolds without the valve in it).
So nows the questiong ; has anybody experience with riding without the valve in the exhaust manifold?and give that troubles?

Already many thanks
Greetz,
Gunnie

**theoldguy** · 05-26-2007, 06:47 AM

The valve was to heat the carb on cold days ,( winter) and is not really necessary for summer driving. I usually block off the heat anyway as it helps to keep down the vapor lock problems you can experience on really hot days

**39CENT** · 05-26-2007, 11:24 PM

cutting out the valve will allow full heat to the intake manifold. this will be too much heat,and will cause problems, [warping.cracking manifolds, vapor lock] especially on hot days. A plate, a piece of exhaust pipe, or even the old valve tack welded, will direct the heat out to the exhaust system. In extreme cold it will take longer to heat the intake, the exhaust and intake manifolds being bolted together will heat the intake enough. [some cars use engine coolant].