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12-10-2002, 12:35 PM
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#1 |
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Registered User
Join Date: Dec 2002
Location: Milwaukee, Wisconsin
Posts: 198
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Heat Riser
Does anyone know if the Heat Riser (valve in passenger side exhaust manifold near flange) sticks closed or open when the vacuum line to it is disconnected or in my case gone? Thanks for any info
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12-10-2002, 12:42 PM
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#2 |
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Whats this wire for?....
Join Date: Dec 2002
Location: Barrie, Ontario, CANADA
Posts: 378
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In my truck, it was gone too. I had an exhaust shop check it and weld it in the open position. As for the position it stays, it kinda flaps around a bit.
IMO when the vacuum is applied the diaphragm should pull up on the rod right? So up should be open. Good Luck!
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Kyle  CANADIAN CONNECTION'82 C10 Resto-Custom--> * 2 1/4" manifold back dual exhaust with Hooker Aerochambers & High Flow Cats *Taylor Ignition Wires *Centerline 15" Telstars with 32"x10" mudders |
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12-10-2002, 12:47 PM
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#3 |
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Registered User
Join Date: Dec 2002
Location: Milwaukee, Wisconsin
Posts: 198
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Mine feels like theres some spring tension. I went out to move it and it went back to wide open or closed. Could that just be the vacuum diaphragm giving the tension?
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Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian. |
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12-10-2002, 12:49 PM
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#4 |
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You get what you pay for
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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The valve opens with with a built in spring. When the engine is cold, vacuum which is routed throught the TVS closes the valve. As the engine coolant warms up, it slowly shuts off vacuum going to the valve, allowing it to open with the spring pressure.
So, if you have no vacuum going to it, it should be open all the time.
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Mike 1985 Chevy C-10 |
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12-10-2002, 12:55 PM
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#5 |
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Whats this wire for?....
Join Date: Dec 2002
Location: Barrie, Ontario, CANADA
Posts: 378
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theres the difference, I had no rod on mine, and the spring was broken.... the flapping noise drove me crazy!
__________________
Kyle CANADIAN CONNECTION'82 C10 Resto-Custom--> * 2 1/4" manifold back dual exhaust with Hooker Aerochambers & High Flow Cats *Taylor Ignition Wires *Centerline 15" Telstars with 32"x10" mudders |
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12-10-2002, 12:57 PM
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#6 |
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Registered User
Join Date: Dec 2002
Location: Milwaukee, Wisconsin
Posts: 198
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Nuts, I was hoping it was closed. That pretty much means the weird noise coming from over there is more then likely a knock then.
__________________
Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian. |
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