Heat riser questions ?
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 15
Likes: 0
From: Coffrane Switzerland
Heat riser questions ?
Hi,
Why is the purpose of the heat riser? Why is it only on the passenger side of the exhaust system?
I have a lower compression rate on the passenger side of the engine, could the heat rise be the cause?
Thanks for your usefull answers,
Mike
Why is the purpose of the heat riser? Why is it only on the passenger side of the exhaust system?
I have a lower compression rate on the passenger side of the engine, could the heat rise be the cause?
Thanks for your usefull answers,
Mike
Pro
Joined: Aug 1999
Posts: 749
Likes: 0
From: Perth,Western Australia,Australia
Re: Heat riser questions ? (mpeter)
http://www.thebugshop.org/bsfqrisr.htm
As for your compression,I can't see how the heat riser will have any effect.
As for your compression,I can't see how the heat riser will have any effect.
Race Director
Joined: Apr 1999
Posts: 10,866
Likes: 717
From: Beverly Hills/Pine Ridge Florida
Re: Heat riser questions ? (mpeter)
When the engine is cold, the heat riser partially occludes the exhaust flow, directing it "upward" through the intake manifold, warming it and the fuel/air charge going through the carburetor. This makes for smoother running till the engine warms up.
With the riser closed or partially closed, the exhaust gasses pass upward from the passenger side, through the intake manifold, and are exhausted through the drivers side system. That's why there is only a heat riser on one side.
As the engine warms up, the thermostatic coil on the heat riser opens, allowing the "flapper valve" to open. This then allows free flowing exhaust. Should have absolutely NO effect on the compression ratio. Chuck
With the riser closed or partially closed, the exhaust gasses pass upward from the passenger side, through the intake manifold, and are exhausted through the drivers side system. That's why there is only a heat riser on one side.
As the engine warms up, the thermostatic coil on the heat riser opens, allowing the "flapper valve" to open. This then allows free flowing exhaust. Should have absolutely NO effect on the compression ratio. Chuck
