[DeTomaso] Turkey Trays
Larry Weston
lplugw at hotmail.com
Wed Mar 28 08:55:18 EDT 2007
As I rememeber the exhaust crossover in an intake manifold was one piece of
a two part system to heat the incoming air charge for better low speed
drivability. The other piece was the "Heat Riser",
which was a flapper valve in the outlet end of a cast iron exhaust manifold,
controlled by a bimetallic spring.
When the exhaust manifold was cold the flapper would be in the closed
position, forcing exhaust gases up through the intake manifold crossover
passage and out the opposite side exhaust manifold.
The flow of the hot gases would warm the intake until the engine warmed up
and the bimetallic element opened the flapper and the exhaust flowed out
through the exhaust pipe. Flow through the intake manifold would essentially
cease because there is no more pressure differential pushing it through the
restrictive crossover passage.
With no heat riser valve I would say what liitle exhaust gas that travels
through the crossover passage is probably cooled by the incoming air and
evaporating gasoline and never retains enough heat to burn/bake oil on the
bottomside of the manifold.
I'm in the middle of changing my intake. Considering the comment that metal
turkey tray gaskets can actually dent an aluminum manifold, I'm prone to
going to the composite gaskets with no tray.
Any comments?
Thanks,
Larry
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