Power valve selection
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=35940
Printed Date: October-07-2024 at 10:58pm
Topic: Power valve selection
Posted By: mamigacz
Subject: Power valve selection
Date Posted: May-04-2015 at 11:45am
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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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Replies:
Posted By: pmt2234
Date Posted: May-23-2015 at 4:22pm
| Many thanks for the data. Do you know your cam specs? |
Posted By: mamigacz
Date Posted: May-23-2015 at 11:00pm
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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 |