Power valve selection

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   I thought it would be helpful to share some information I collected.

I recorded vacuum data (from a MAP sensor) while driving at steading state speeds (not accelerating).  The graph I attached has RPM on the Y axis and vacuum on the X axis.  I also added some reference lines to show when a 2.5 and 6.5 power valve would open.

My engine is modified with Cam research camshaft, GT40p heads and a performer RPM intake.  A stock cam would yield a different curve (higher vacuum levels) than what I am showing.  Also, I was the only person in the boat and not towing any skiiers.  However it does show a good example of when a power valve would open to enrichen the fuel mixture.  

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mamigacz Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-08-2014 Location: Wisconsin Status: Offline Points: 96	Post Options Post Reply Quote mamigacz Report Post Thanks(0) Quote Reply Topic: Power valve selection Posted: May-04-2015 at 11:45am
	I thought it would be helpful to share some information I collected. I recorded vacuum data (from a MAP sensor) while driving at steading state speeds (not accelerating). The graph I attached has RPM on the Y axis and vacuum on the X axis. I also added some reference lines to show when a 2.5 and 6.5 power valve would open. My engine is modified with Cam research camshaft, GT40p heads and a performer RPM intake. A stock cam would yield a different curve (higher vacuum levels) than what I am showing. Also, I was the only person in the boat and not towing any skiiers. However it does show a good example of when a power valve would open to enrichen the fuel mixture.

pmt2234 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-14-2005 Location: United States Status: Offline Points: 46	Post Options Post Reply Quote pmt2234 Report Post Thanks(0) Quote Reply Posted: May-23-2015 at 4:22pm
	Many thanks for the data. Do you know your cam specs?

mamigacz Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-08-2014 Location: Wisconsin Status: Offline Points: 96	Post Options Post Reply Quote mamigacz Report Post Thanks(0) Quote Reply Posted: May-23-2015 at 11:00pm
	Always glad to help! intake lift .49 exhaust lift .49 intake duration 278 exhaust duratation 282 Intake duration @.050 216 Exhaust duration @ .050 220 lobe separation 112

Power valve selection

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