power plate Question
- Thread starter pwhite
- Start date
Restriction..
Here's a fluid flow basic. ANYTHING in the flow path is a restriction. Fluid will not move unless it has something to push it along. (Basic Newton's law) The pressure in the cylinder will always be lower than the pressure farther up the intake path. P at the turbo outlet is higher, then the pipes, the IC, the throttle body, everything that contacts the flowing air causes some amount of pressure drop. It is NOT the smallest area that limits the flow, unless the flow reaches Mach 1, which ain't the case until you get to the valves. So, yes the PP is a "restriction", and it does reduce flow to the rear cylinders. BUT, the flow was already limited to those cylinders, by KNOCK. Using the PP will allow the flow to INCREASE to cylinders closer to the front of the engine, and and you will be able to run a little more boost, since the rear cylinders won't reach the knock point way before the front ones. The EGT tests showed that without the PP, there was over 100 degrees difference between front and back. With the PP, the EGT of the front cylinders INCREASED, while the EGT of the rear cylinders decreased, so that the difference was only about 60 degrees. Anyone who claims that the PP works by restricting total air flow, and thus making all cylinders richer, doesn't understand flow, and hasn't looked at the EGT data.
Look here: http://turbobuick.com/forums/showthread.php?s=&threadid=85978EGT tests of Power Plate
Here's a fluid flow basic. ANYTHING in the flow path is a restriction. Fluid will not move unless it has something to push it along. (Basic Newton's law) The pressure in the cylinder will always be lower than the pressure farther up the intake path. P at the turbo outlet is higher, then the pipes, the IC, the throttle body, everything that contacts the flowing air causes some amount of pressure drop. It is NOT the smallest area that limits the flow, unless the flow reaches Mach 1, which ain't the case until you get to the valves. So, yes the PP is a "restriction", and it does reduce flow to the rear cylinders. BUT, the flow was already limited to those cylinders, by KNOCK. Using the PP will allow the flow to INCREASE to cylinders closer to the front of the engine, and and you will be able to run a little more boost, since the rear cylinders won't reach the knock point way before the front ones. The EGT tests showed that without the PP, there was over 100 degrees difference between front and back. With the PP, the EGT of the front cylinders INCREASED, while the EGT of the rear cylinders decreased, so that the difference was only about 60 degrees. Anyone who claims that the PP works by restricting total air flow, and thus making all cylinders richer, doesn't understand flow, and hasn't looked at the EGT data.
Look here: http://turbobuick.com/forums/showthread.php?s=&threadid=85978EGT tests of Power Plate
- Joined
- Nov 24, 2001
Re: Restriction..
so your saying that its a restriction, but not a restriction of total airflow right?
so if it doesnt restrict total airflow, how does it hinder airflow, as in slowing the overall airflow???
so your saying that its a restriction, but not a restriction of total airflow right?
so if it doesnt restrict total airflow, how does it hinder airflow, as in slowing the overall airflow???
V6UnderPressure
The Artist FKA Scott4DMny
- Joined
- May 27, 2001
Just for another real life user. I run a 70mm precision plenum/TB with power plate. Before I used it, 17 to 18psi on 93 octane pump gas, little knock in 3rd with 18psi. Switched to power plate and was able to run 19-20psi with 93 octane with it hitting a bit of knock in 3rd with the 20 psi. I think that comes out to about a 1-2psi difference. Just stating the facts. I love it and Will NOT get rid of it.
Scott
Scott
V6UnderPressure
The Artist FKA Scott4DMny
- Joined
- May 27, 2001
Just for another real life user. I run a 70mm precision plenum/TB with power plate. Before I used it, 17 to 18psi on 93 octane pump gas, little knock in 3rd with 18psi. Switched to power plate and was able to run 19-20psi with 93 octane with it hitting a bit of knock in 3rd with the 20 psi. I think that comes out to about a 1-2psi difference. Just stating the facts. I love it and Will NOT get rid of it.
Scott
Scott
